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-1- a a e e h h h h a a l l f f - - b b r r i i c c k k p p r r o o d d u u c c t t t t e e c c h h n n i i c c a a l l r r e e f f e e r r e e n n c c e e n n o o t t e e s s 48v input, 1.5v@30a output 48v input, 1.5v@30a output high efficiency dc-dc converter high efficiency dc-dc converter (rev01) (rev01) usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 publishing date: 20021010
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -2- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com introduction introduction aeh30m48(n) single output product comes with a 2:1 input range of 36v-75v, isolated out- puts 1.5v/30a. standard features include input low voltage protection(lvp), output over-volt- age protection(ovp), over-current protec- tion(ocp), over-temperature protection(otp), cnt, trim, and remote sense functions. the input-output isolation is 1500vdc, and it can operate up to 100 c(base-plate temperature) without derating. aeh30m48(n) single output isolated dc/dc converters are built using the industry standard half-brick pin-out and pack- age: 61.0mm x 57.9mm x 12.7mm ( 2.4" x 2.28" x 0.5") . typical efficiencies are 78% for the 1.5v@30a output. the aeh30m48(n) single output is designed to meet cispr22, en55022, ul, tuv, and csa certifications. designed for high reliability, the converters use high quality components, 100% surface mount technology and manufactured in iso9001 facilities. design features design features high efficiency high power density low output noise metal base-plate cnt function trim function remote sense input under-voltage protection output short circuit protection output current limiting output over-voltage protection over-temperature protection high input-output isolation voltage options options heat sink available for extended operation. choice of cnt logic configuration.
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -3- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com fuse* trm vo(-) -sen vo(+) +sen vin(-) cnt vin(+) load c4 c2 case power c1 c3 k note: the figure is negative logic control, if the cnt pin is left open, the converter will default to 'con- trol off' operation. positive logic control is also available. positive logic control: low=off, high=on. negative logic control: low=on, high=off. recommended external components: fuse*: recommended: 3a. c1: recommended 100 f/100v (use two parallel at -40 c ). c2: recommended electrolytic capacitor of 2200 f /16v(low esr). c3: recommended 4700pf/2000v c4: recommended metallic film capacitor of 1 f /16v. t t ypical application ypical application block diagram block diagram +vout -vout +sense -sense trim +vin -vin cnt
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -4- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com ordering information ordering information aeh30m48(n) 36-75 1.5 30 60&100 76 33-39 1.8-2.3 model input output output ripple&noise efficiency short-circuit over-voltage voltage voltage current (%) current lockout (v) (v) (a) (mv pp) min (a) (v)
usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -5- electrical characteristic electrical characteristic absolute maximum rating absolute maximum rating parameters min. typ. max. unit note input voltage (+vin ~ -vin) -0.3 - 80 vdc continuously cnt voltage (cnt ~ -vin) -0.7 - 15 vdc continuously isolated voltage - - 1500 vdc input-output operating ambient temperature -40 - +100 c storage temperature -40 - +125 c input characteristics input characteristics parameter code min. typ. max. unit conditions input voltage range vin 36 48 75 vdc maximum input current iin - - 2 a (the lowest input voltage, rated output ) input under-voltage shutdown - 30 33 35 vdc input reflected current - - 30 map-p ( 5hz-20mhz, 12 h impedance, ambient temperature t a=25c ) general specification general specification parameter code min. typ. max. unit conditions mtbf - 2000000 - - hour weight - - 70 - g cnt function cnt function parameter code min. typ. max. unit conditions logic high - 3.5 - 15 v logic low - -0.7 - 1.2 v control current ---1ma logic low cnt characteristics cnt characteristics parameter code min. typ. max. unit conditions cnt is set on, input voltage tdelay - - 10 ms (80% rated load, ambient temperature sudden change (on) 25 c) output voltage rise time trise - 10 20 ms output voltage rush over trush - 0 - %vo
output characteristics output characteristics parameter code min. typ. max. unit conditions output setpoint voltage vo,set 1.480 1.500 1.520 vdc 25 c ambient temperature,rated input, full load output voltage vo 1.480 1.500 1.520 vdc full input range, output range and ambient temperature range.0~100% load line regulation - - 0.1 0.2 % low-high load regulation - - 0.1 0.5 % 0~100% rated load (+io=-io) temperature coefficient tcoeff - - 0.02% / c output ripple peak-peak value ---60 mvp-p output noise peak-peak value - - - 100 mvp-p f<20mhz output current io - - 30 a (when io>iomax, the module can operate normally, but the ripple&noise may exceed the standards.) output current-limiting setpoint - 33 - 39 a (vo=90%vo) efficiency 76 78 - - (rated input voltage, rated load, ambient temperature 25 c) dynamic response voltage inrush vo,set - - 80 mv 25% inom step, ? io/ ? t=1a/10 s response time ---200 s switching frequency - - 220 - khz output voltage adjustable range - 80% - 110% vo,set output over-voltage shutdown - 1.8 - 2.3 v +vo~ -vo safety characteristics safety characteristics parameter code min. typ. max. unit isolation voltage: input - output - 1500 - - vdc input -case - 1500 - - vdc output - case - 1500 - - vdc isolation resistance - 10 - - m ? a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -6- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -7- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com characteristic curves characteristic curves (at 25 (at 25 c) c) reflected noise current testing with 12 h impedance, test point in the input line output ripple & noise testing method +vin -vin current probe 12 h 100 f ci cs 220 f l test battery + + to oscilloscope to grounding loop output current (a) efficiency (%) 36vin 48vin 75vin 50 60 70 80 90 0 5 10 15 20 25 30 35 0 0.5 1 1.5 2 0 20 40 60 80 100 input voltage (v) input current (a) typical efficiency aeh30m48n typical input-output characteristics aeh30m48n output current (a) output voltage (v) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 15 30 45 36vin 48vin 75vin typical ocp aeh30m48n
t t ransient response ransient response (48v rated input voltage, full load, at 25 c) (48v rated input voltage, full load, at 25 c) a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -8- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com typical start-up from power on aeh30m48n typical shut-down from power off aeh30m48n typical start-up transient with cnt aeh30m48n typical shut-down transient with cnt aeh30m48n
usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com t t ransient response ransient response (48v rated input voltage, full load, at 25 c) (48v rated input voltage, full load, at 25 c) a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -9- typical output ripple voltage aeh30m48n typical overvoltage protection aeh30m48n typical transient response to step load change from 25%-50%-25%iomax aeh30m48n typical transient response to step load change from 50%-75%-50%iomax aeh30m48n
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -10- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com pin location pin location the +vin and -vin input connection pins are located as shown in figure 1. aeh30m48 con- verter has a 2:1 input voltage range and can accept input voltage range of 36-75 vdc. care should be taken to avoid applying reverse polarity to the input which can dam- age the converter. input characteristic input characteristic fusing fusing the aeh30m48(n) power module has no internal fuse. an external fuse must always be employed! to meet international safety requirements, a 250 volt rated fuse should be used. if one of the input lines is connected to chassis ground, then the fuse must be placed in the other input line. standard safety agency regulations require input fusing. recommended fuse ratings for the aeh30m48(n) is 3a. input reverse v input reverse v oltage protection oltage protection under installation and cabling conditions where reverse polarity across the input may occur, reverse polarity protection is recommended. protection can easily be provided as shown in figure 2. in both cases the diode rating is deter- mined by the power of the converter. diodes should be rated at 3a/100v for aeh30m48(n). placing the diode across the inputs rather than in-line with the input offers an advan- tage in that the diode only conducts in a reverse polarity condition, which increases circuit efficiency and thermal performance. input undervoltage shutdown input undervoltage shutdown the module has input under voltage protection. the aeh30m48(n) is protected against under- voltage on the input. if the input voltage drops below the acceptable range, the converter will shut down. it will automatically restart when the under-voltage condition is removed. when the input voltage is below lvp point, the input under-voltage protection active, output is cut off. there is a 1-2v hysteresis between the under-voltage shutdown point and restart up point. input filter input filter input filters are included in the converters to help achieve standard system emissions certifi- cations. some users however, may find that additional input filtering is necessary. the aeh30m48(n) has an internal switching fre- quency of 220 khz so a high frequency capac- -vin case cnt -vout -sense trim +sense +vout +vin component-side footprint fig.1 pin location +vin -vin +vin -vin fig.2 reverse polarity protection circuits
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -11- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com itor mounted close to the input terminals pro- duces the best results. to reduce reflected noise, a capacitor can be added across the input as shown in figure 3, forming a filter. a 100 f/100v electrolytic capacitor is recom- mended for c1. for conditions where emi is a concern, a differ- ent input filter can be used. figure 4 shows an typical application circuit special designed to reduce emi effects. users can choose different capacitor value according to actual applica- tions. c1 is recommended 100 f/100v. the recommended value of c2 is a 0.22 f/100v safety capacitor, cy1 and cy2 are each 4700pf/250v safety capacitor. cy3 and cy4 are each 0.022 f/275v safety capacitor. c3 is 2200 f/16v. c4 and c5 is 4700pf/250vsafety capacitor. c6 is 0.1 f/100v ceramic capacitor. l1 is a 6mh common mode choke. when a filter inductor is connected in series with the power converter input, an input capac- itor c 1 should be added. an input capacitor c 1 should also be used when the input wiring is long, since the wiring can act as an inductor. failure to use an input capacitor under these conditions can produce large input voltage spikes and an unstable output. control function control function two cnt options are available. for negative logic: applying a voltage less than 1.2v to the cnt pin will enable the output, and applying a voltage greater than 3.5v will disable it. for positive logic: applying a voltage larger than 3.5v to the cnt pin will enable the output, and applying a voltage less than 1.2v will dis- able it. positive logic, device code suf fix ? p ? . negative logic, device code suffix nothing is the factory-preferred. if the cnt pin is left open, the converter will default to ? control off ? operation in nega- tive logic, but default to ? control on ? in positive logic. the maximum voltage that can be applied to the cnt pin is 15v. if the cnt function is not used: negative logic --- connect cnt pin to vin(-), positive logic --- leave cnt pin open. +vin -vin c1 fig.3 ripple rejection input filter vo(-) vo(+) c1 c2 c y1 c y2 l1 c y3 c y4 c6 vin(+) vin(-) c4 load c5 c3 fig.4 emi reduction input filter fig.5 non-isolated cnt control fig.6 isolated cnt control
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -12- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com during operation, the working current of cnt is related to its input voltage, and is lower than 1ma. in the non-isolated application, cnt control can be realized through mechanical switcher or transistor as figure 5. in the isolated application, cnt control can be realized through optoisolator or relay as fig. 6. it is recommended to parallel a 0.1 f capacitor to remove the interference when the cnt line is too long. input-output characteristic input-output characteristic safety consideration safety consideration for safety-agency approval of the system in which the power module is used, the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standard, i.e., ul1950, csa c22.2 no. 950-95, and en60950. the input-to-output 1500vdc isolation is an opera- tional insulation. the dc/dc power module should be installed in end-use equipment, in compliance with the requirements of the ulti- mate application, and is intended to be supplied by an isolated secondary circuit. when the sup- ply to the dc/dc power module meets all the requirements for selv(<60vdc), the output is considered to remain within selv limits (level 3). if connected to a 60vdc power system, dou- ble or reinforced insulation must be provided in the power supply that isolates the input from any hazardous voltages, including the ac mains. one vi pin and one vo pin are to be grounded or both the input and output pins are to be kept floating. single fault testing in the power supply must be performed in combina- tion with the dc/dc power module to demon- strate that the output meets the requirement for selv. the input pins of the module are not operator accessible. note : do not ground either of the input pins of the module, without grounding one of the output pins. this may allow a non-selv voltage to appear between the output pin and ground. case grounding case grounding for proper operation of the module, the case or baseplate of the aeh30m48(n) does not require a connection to a chassis ground. if the aeh30m48(n) is not in a metallic enclosure in a system, it may be advisable to directly ground the case to reduce electric field emissions. leaving the case floating can help to reduce magnetic field radiation from common mode noise currents. if the case has to be grounded for safety or other reasons, an inductor can be connected to chassis at dc and ac line fre- quencies, but be left floating at switching fre- quencies. under this condition, the safety requirements are met and the emissions are minimized. output characteristics output characteristics minimum load requirement minimum load requirement there is no minimum load requirement for the aeh30m48(n). remote sensing remote sensing the aeh30m48(n) can remotely sense both lines of its output which moves the effective out- put voltage regulation point from the output of the unit to the point of connection of the remote sense pins. this feature automatically adjusts the real output voltage of the aeh30m48(n) in order to compensate for voltage drops in distri- bution and maintain a regulated voltage at the point of load.
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -13- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com when the converter is supporting loads far away, or is used with undersized cabling, sig- nificant voltage drop can occur at the load. the best defense against such drops is to locate the load close to the converter and to ensure ade- quately sized cabling is used. when this is not possible, the converter can compensate for a drop of up to 0.5v, through use of the sense leads. when used, the +sen and -sen leads should be connected from the converter to the point of load as shown in figure 7 using twisted pair wire. the converter will then regulate its output voltage at the point where the leads are con- nected. care should be taken not to reverse the sense leads. if reversed, the converter will trig- ger ovp protection and turn off. when not used, the +sen lead must be connected with +vo, and -sen with -vo. also note that the out- put voltage and the remote sense voltage offset must be less than the minimum overvoltage trip point. note that at elevated output voltages the maximum power rating of the module remains the same, and the output current capability will decrease correspondingly. t t rim rim users can increase or decrease the output volt- age set point of a module by connecting an external resistor between the trim pin and either the +sen or -sen pins. the trim resistor should be positioned close to the module. if not using the trim feature, leave the trim pin open. trimming up by more than 10% of the nominal output may damage the converter or trig the ovp protection. trimming down more than 20% can cause the converter to regulate improperly. trim down and trim up circuits and the corresponding configuration are shown in figure 8 to figure 11. y ( % change in output voltage ) adjustment resistor value (k ? ) 0 2 4 6 8 10 12 14 16 18 20 0 1 2 3 4 5 6 7 8 9 10 21 r adj-up = y - vin(+) cnt case v o (+) v o (?) +sen trm -sen r adj-up r load y is the adjusting percentage of the voltage. 0 < y [ 10 r adj-up is in k ? . vo is rated output voltage. vin(-) 1.5 fig.9 resistor selection for trimming up fig.8 equation to trim up output voltage r adj-down = vin(+) vin(-) cnt case v o (+) v o ( ? ) +sen trm -sen r adj-down r load 100 y - 1.51 y is the adjusting percentage of the voltage. 0 < y [ 20 r adj-up is in k ? . vo is rated output voltage. fig.10 equation to trim down output voltage +v out -v out load +sense -sense twisted pair +s -s fig.7 sense connections
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -14- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com note that at elevated output voltages the maximum power rating of the module remains the same, and the output current capability will decrease correspondingly. trimming up the output voltage, the output power should not exceed its rated output power. output over-current protection: output over-current protection: aeh30m48(n) dc/dc converters feature over- current protection (ocp) circuits. when output current exceeds 110% to 130% of rated current, such as during a short circuit condition, the out- put will shutdown immediately, and can tolerate short circuit conditions indefinitely. when th eover-current condition is removed, the converter sill automatically restart. output over-v output over-v oltage protection oltage protection the over-voltage protection has a separate feedback loop which activates when the output voltage is between 1.8~2.3v. when an over- voltage condition occurs, a "turn off" signal is sent to the input of the module which will shut down the output. the module will restart after power on again. if the module is trimmed up to the voltage, which exceeds the 110% rated output voltage, the output over-voltage protection will be prob- ably triggered off. output filters output filters when the load is sensitive to ripple and noise, an output filter can be added to minimize the effects. a simple output filter to reduce output ripple and noise can be made by connecting a capacitor across the output as shown in figure 12. the recommended value for the output capacitor c1 is 2200 f/16v(low esr). extra care should be taken when long leads or traces are used to provide power to the load. long lead lengths increase the chance for noise to appear on the lines. under these con- ditions c2 can be added across the load as shown in figure 13. the recommended compo- nent for c2 is 2200 f/16v(low esr) capacitor and connecting a 0.1 f ceramic capacitor c1 in parallel generally. +v out -v out load c 1 c 2 fig.13 output ripple filter for a distant load +v out -v out load c 1 fig.12 output ripple filter y ( % change in output voltage ) adjustment resistor value (k ? ) 0 10 20 30 40 50 60 70 80 90 100 0 2 4 6 8 10 12 14 16 18 20 fig.11 resistor selection for trimming down
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -15- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com decoupling decoupling noise on the power distribution system is not always created by the converter. high speed analog or digital loads with dynamic power demands can cause noise to cross the power inductor back onto the input lines. noise can be reduced by decoupling the load. in most cases, connecting a 10 f tantalum capacitor in paral- lel with a 0.1 f ceramic capacitor across the load will decouple it. the capacitors should be connected as close to the load as possible. ground loops ground loops ground loops occur when different circuits are given multiple paths to common or earth ground, as shown in figure 14. multiple ground points can slightly different potential and cause current flow through the circuit from one point to another. this can result in additional noise in all the circuits. to eliminate the problem, circuits should be designed with a single ground con- nection as shown in figure 15. parallel power distribution parallel power distribution figure 16 shows a typical parallel power distri- bution design. such designs, sometimes called daisy chains, can be used for very low output currents, but are not normally recommended. the voltage across loads far from the source can vary greatly depending on the ir drops along the leads and changes in the loads clos- er to the source. dynamic load conditions increase the potential problems. radial power distribution radial power distribution radial power distribution is the preferred method of providing power to the load. figure 17 shows how individual loads are connected directly to the power source. this arrangement requires additional power leads, but it avoids the voltage variation problems associated with the parallel power distribution technique. mixed distribution mixed distribution in the real world a combination of parallel and radial power distribution is often used. dynamic and high current loads are connected using a radial design, while static and low current loads can be connected in parallel. this combined approach minimizes the drawbacks of a parallel design when a purely radial design is not feasible . load 1 load 2 load 3 +vout -vout r l1 r l2 r l3 r g1 r g2 r g3 r l = lead resistance r g = ground lead resistance fig.17 radial power distribution load 1 load 2 load 3 +vout -vout r l1 r l2 r l3 r g1 r g2 r g3 i 1 + i 2 + i 3 i 2 + i 3 i 3 r l = lead resistance r g = ground lead resistance fig.16 parallel power distribution +vout -vout load load r line r line r line r line r line r line ground loop fig.14 ground loops fig.15 single point ground +vout -vout load load r line r line r line r line r line
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -16- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com redundant operation redundant operation a common requirement in high reliability sys- tems is to provide redundant power supplies. the easiest way to do this is to place two con- verters in parallel, providing fault tolerance but not load sharing. oring diodes should be used to ensure that failure of one converter will not cause failure of the second. figure 19 shows such an arrangement. upon application of power, one of the converters will provide a slightly higher output voltage and will support the full load demand. the second converter will see a zero load condition and will ?idle?. if the first converter should fail, the second converter will support the full load. when designing redundant converter circuits, shottky diodes should be used to minimize the forward voltage drop. the voltage drop across the shottky diodes must also be considered when deter- mining load voltage requirements. thermal management t t echnologies echnologies aeh30m48(n) modules feature high efficiency, it have typical efficiency of 78% at full load. with less heat dissipation and temperature-resistant components such as ceramic capacitors, these modules exhibit good behavior during pro- longed exposure to high temperatures. maintaining the operating board temperature (tc) within the specified range help keep inter- nal-component temperatures within their speci- fications which in turn help keep mtbf from falling below the specified rating. proper cool- ing of the power modules is also necessary for reliable and consistent operation. basic thermal management basic thermal management measuring the case temperature of the module (tc) as the method shown in figure 20 can ver- ify the proper cooling. figure 20 shows the metal surface of the module and the pin loca- tions. the module should work under 100c for the reliability of operation and t c must not exceed 100 c while operating in the final sys- tem configuration. the measurement can be made with a surface probe after the module has 29.0 (1.14) 30.5 (1.2) cnt case +sense trim ? sense +vin measure case temperature here base-plate side view dimensions: millimeters (inches) -vin +vout -vout fig.20 case temperature measurement load 1 load 2 load 3 +vout -vout r l1 r l2 r l3 r g1 r g2 r g3 r l = lead resistance r g = ground lead resistance load 4 r l4 r g4 fig.18 mixed power distribution +v out -v out +v out -v out load fig.19 redundant operation
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -17- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com reached thermal equilibrium. if a heat sink is mounted to the case, make the measurement as close as possible to the indicated position. it makes the assumption that the final system configuration exists and can be used for a test environment. the following text and graphs show guidelines to predict the thermal performance of the mod- ule for typical configurations that include heat sinks in natural or forced airflow environments. note that tc of module must always be checked in the final system configuration to verify proper operational due to the variation in test condi- tions. thermal management acts to transfer the heat dissipated by the module to the surrounding environment. the amount of power dissipated by the module as heat (p d ) is got by the equa- tion below: p d = p i ? p o where : p i is input power; p o is output power; p d is dissipated power. also, module efficiency ( ) is defined as the fol- lowing equation: = p o / p i from two above equations can yield the equa- tion below: p d = p o (1- ) / the module power dissipation then can be cal- culated through the equation. because each power module output voltage has a different power dissipation curve, a plot of power dissipation versus output current over three different line voltages is given in each module-specific data sheet. the typical power dissipation curve of aeh30m48(n) is shown in figure21. module derating module derating experiment setup experiment setup from the experimental set up shown in figure 22, the derating curves as figure 23 can be drawn. note that the pwb ( printed-wiring board ) and the module must be mounted verti- cally. the passage has a rectangular cross- section. the clearance between the facing pwb and the top of the module is kept 13 mm (0.5 in.) constantly. dimensions: millimeters (inches). air velocity and ambient temperature measured below the module airflow 19 (0.75) facing pwb module pwb 76 (3.00) fig.22 experiment set up 0 2 4 6 8 10 12 010203040 36vin 48vin 75vin output current (a) power dissipation (w) fig.21 aeh30m48n power dissipation curves
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -18- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com convection w convection w ithout heat sinks ithout heat sinks heat transfer can be enhanced by increasing the airflow over the module. figure 23 shows the maximum power that can be dissipated by the module. in the test, natural convection airflow was mea- sured at 0.05 m/s to 0.1 m/s (10 ft./min. to 20 ft./min.). the 0.5 m/s to 4.0 m/s (100 ft./min. to 800 ft./min.) curves are tested with externally adjustable fans. the appropriate airflow for a given operating condition can be determined through figure 23. heat sink configuration heat sink configuration several standard heat sinks available for the aeh30m48(n) is shown in figure 24 to figure 36. the heat sinks mount to the top surface of the module with screws torqued to 0.56 n-m (5 in.- lb). a thermally conductive dry pad or thermal grease is placed between the case and the heat sink to minimize contact resistance (typi- cally 0.1 c/w to 0.3 c/w) and temperature dif- ferential. nomenclature for heat sink configurations is as follows: wdxyyy40 where: x = fin orientation: longitudinal (l) or trans verse (t) yyy = heat sink height (in 100ths of inch) for example, wdt5040 is a heat sink that is transverse mounted (see figure 31) for a 61 mm x 57.9 mm (2.4 in.x 2.28 in.) module with a heat sink height of 0.5 in. heatsink mounting advice heatsink mounting advice a crucial part of the thermal design strategy is the thermal interface between the baseplate of the module and the heatsink. inadequate mea- dimensions: millimeters (inches). 57.9 (2.28) 61 (2.4) wdl05040 1/2 in. fig.25 longitudinal fins heat sink dimensions: millimeters (inches). wdt10040 61 (2.4) wdt02540 wdt05040 57.9 (2.28) 1/4 in. 1/2 in. 1 in. fig.26 transverse fins heat sink 89.1(3.51) 57.0 (2.24) 11.8 (0.465) 4.9(0.193) dimensions: millimeters (inches). fig.24 non standard heatsink 0 10203040 100 0 21 local ambient temperature, t a (c) power dissipation , p d (w) 15 12 6 90 80 70 60 50 4.0 m/s (800 ft./min.) 0.1 m/s (20 ft./min.) natural convection 1.0 m/s (200 ft./min.) 2.0 m/s (400 ft./min.) 3.0 m/s (600 ft./min.) 3 9 18 1.5 m/s (300 ft./min.) 0.5 m/s (100 ft./min.) fig.23 forced convection power derating without heat sink
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -19- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com sures taken here will quickly negate any other attempts to control the baseplate temperature. for example, using a conventional dry insulator can result in a case-heatsink thermal imped- ance of >0.5 c/w, while use one of the rec- ommended interface methods (silicon grease or thermal pads available from emerson network power) can result in a case-heatsink thermal impedance around 0.1c/w. natural convection with heat sink natural convection with heat sink the power derating for a module with the heat sinks ( shown as figure 21) in natural convec- tion is shown in figure 28. in this test, natural convection generates airflow about 0.05 m/s to 0.1 m/s ( 10ft./min to 20ft./min ). figure 28 can be used for heat-sink selection in natural convection environment. basic thermal model basic thermal model there is another approach to analyze module thermal performance, to model the overall ther- mal resistance of the module. this presentation method is especially useful when considering heat sinks. the following equation can be used to calculate the total thermal resistance . r ca = ? t c , max / p d where r ca is the module thermal resistance; ? t c , max is the maximum case temperature rise; p d is the module power dissipation. in this model, p d , ? t c, max , and r ca are equals to current flow, voltage drop, and electrical resistance, respectively, in ohm's law, as shown in figure 29. also, ? t c, max is defined as the difference between the module case tem- perature (t c ) and the inlet ambient temperature (t a ). ? t c , max = t c ? t a where t c is the module case temperature, t a is the inlet ambient temperature. for aeh30m48(n), the module's thermal resis- tance values versus air velocity have been determined experimentally and shown in figure 30. the highest values on each curve repre- sents the point of natural convection. fig.27 heat sink mounting 0 10203040 90100 0 20 25 30 35 local ambient temperature, t a (c) power dissipation, p d (w) 15 10 5 50 60 70 80 1 1/2 in. 1 in. 1/2 in. 1/4 in. none fig.28 heat sink power derating curves, natural convection bmpm p d = bmpm thermal resistance fig.29 basic thermal resistance model
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -20- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com figure 30 is used for determining thermal per- formance under various conditions of airflow and heat sink configurations. mechanical mechanical considerations considerations installation installation although aeh30m48(n) converters can be mounted in any orientation, free air-flowing must be taken. normally power components are always put at the end of the airflow path or have the separate airflow paths. this can keep other system equipment cooler and increase component life spans. soldering soldering aeh30m48(n) is compatible with standard wave soldering techniques. when wave solder- ing, the converter pins should be preheated for 20-30 seconds at 110 c, and wave soldered at 260c for less than 10 seconds. when hand soldering, the iron temperature should be maintained at 4 25c and applied to the converter pins for less than 5 seconds. longer exposure can cause internal damage to the converter. cleaning can be performed with cleaning solvent ipa or with water. mtbf mtbf the mtbf, calculated in accordance with bellcore tr-nwt-000332 is 2,000,000 hours. obtaining this mtbf in practice is entirely pos- sible. if the ambient air temperature is expected to exceed +25c, then we also advise a heatsink on the aeh30m48(n), oriented for the best possible cooling in the air stream. emerson network power can supply replace- ments for converters from other manufacturers, or offer custom solutions. please contact the factory for details. 0 0.5 (100) 1.0 (200) 1.5 (300) 2.0 (400) 2.5 (500) 3.0 (600) 0 1 5 6 7 8 air velocity m/s (ft./min.) 4 3 2 case-ambient thermal resistance r ca (c/w) 1 in. heat sink 1/2 in. heat sink 1/4 in. heat sink no heat sink fig.30 case-to-ambient thermal resistance curves; either orientation
a a a a e e e e h h h h h h h h i i i i g g g g h h h h e e e e f f f f f f f f i i i i c c c c i i i i e e e e n n n n c c c c y y y y s s s s e e e e r r r r i i i i e e e e s s s s h h h h a a a a l l l l f f f f - - b b b b r r r r i i i i c c c c k k k k p p p p o o o o w w w w e e e e r r r r c c c c o o o o n n n n v v v v e e e e r r r r t t t t e e e e r r r r s s s s 3 3 3 3 6 6 6 6 v v v v d d d d c c c c t t t t o o o o 7 7 7 7 5 5 5 5 v v v v d d d d c c c c i i i i n n n n p p p p u u u u t t t t , , , , 1 1 1 1 . . . . 5 5 5 5 v v v v @ @ @ @ 3 3 3 3 0 0 0 0 a a a a o o o o u u u u t t t t p p p p u u u u t t t t -21- usa europe asia tel: 1-760-930-4600 44-(0)1384-842-211 852-2437-9662 fax: 1-760-930-0698 44-(0)1384-843-355 852-2402-4426 www.astec.com base-plate side view dimensions are in millimeters and (inches). 10.16 (0.400) 10.16 (0.400) 12.7 (0.50) 48.3 (1.90) 48.26 (1.900) 4.8 (0.19) mounting inserts module outline 5.1 (0.20) 57 . 9 (2 . 28) max 17.78 (0.700) 25.40 (1.000) 35.56 (1.400) 25.40 (1.000) 50.8 (2.00) 35.56 (1.400) 61.0 (2.40) -vout -vin ?sense trim +sense case cnt +vin +vout max mechanical chart mechanical chart recommend hole pattern recommend hole pattern -vin case cnt +vin +vout +sense trim -sense -vout 5.1 (0.2) 10.16 (0.4) 15.24 (0.6) 4.8 (0.19) 48.26 (1.9) 10.16 (0.4) 10.16 (0.4) 10.16 (0.4) 7.62 (0.3) 7.62 (0.3) 7.62 (0.3) 57.9 (2.28) 61.0 (2.4) mm (inches) 7- 12.7 (0.5) mounting inserts m3 thru hole x4 2- 2.0 (0.08) only +vo and -vo 1.0 (0.04) all pins except +vo and -vo length optional 4.8 (0.189) default base-plate side view tolerances: inches millimeters .xx ! 0.020 .x ! 0.5 .xxx ! 0.010 .xx ! 0.25 pins >4mm ! 0.02inch ( ! 0.5mm) <4mm ! 0.01inch ( ! 0.25mm) pin length option 4.80mm ! 0.5mm 0.189in. ! 0.020in. 3.80mm ! 0.25mm 0.150in. ! 0.010in. 5.80mm ! 0.5mm 0.228in. ! 0.02in. 2.80mm ! 0.25mm 0.110in. ! 0.010in. device code suffix none (default) -6 -7 -8

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