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ampss ? astec modular power supply system series highlights ? high efficiency - up to 87% ? 85c baseplate/case operating temperature ? low output ripple and noise ? high reliability - over 1 million hours mtbf ? wide input voltage range ? excellent transient response ? fixed switching frequency ? designed to meet telecom specification dc-dc converter module technical reference manual ak80a economy series 132 - 240w output power
ak80a e conomy s er i es rev. 06 aug 00 ampss ? reference manual 2 contents introduction ................................................................................................................... 4 special features ............................................................................................................. 4 ordering information ..................................................................................................... 5 safety ......................................................................................................................... .... 5 electrical specifications ............................................................... 6 absolute maximum ratings ? all models ...................................................................... 6 pin connections - all models ......................................................................................... 7 insulation - all models .................................................................................................... 8 electrical specifications for 24v input models (ak80a-024l-xxxfyy) ...................... 9 functional description ............................................................... 11 remote sense (+sense, -sense) ............................................................................ 11 enable control (enable) .......................................................................................... 11 output voltage adjustment (v adj) ........................................................................... 11 power good/identification (pg/id) ............................................................................ 12 current sharing (c share)........................................................................................ 12 clock signals (clk in, clk out) ........................................................................... 12 temperature monitoring (temp mon) ...................................................................... 13 current limit adjustment (c lim adj) ...................................................................... 13 pri aux ..................................................................................................................... 13 design considerations ................................................................ 15 input bulk capacitors .................................................................................................. 15 remote loads .............................................................................................................. 15 input fusing ................................................................................................................. 15 parallel connection considerations ............................................................................. 15 break regulation .......................................................................................................... 16 conducted emi ........................................................................................................... 16 overtemperature protection ......................................................................................... 16 thermal data ................................................................................................................ 16 mtbf .......................................................................................................................... 1 7 output ripple and noise ............................................................................................. 17
rev. 05 aug 00 ampss ? reference manual specifications 3 application examples ................................................................. 18 ac input design .......................................................................................................... 18 parallel connection design .......................................................................................... 18 mechanical information ............................................................. 19 dimensions ................................................................................................................... 19 recommended pcb layout ........................................................................................ 20 heatsink mounting information ................................................................................... 21
ak80a e conomy s er i es rev. 06 aug 00 ampss ? reference manual 4 ak80a economy series dc-dc converters introduction the ak80a is an isolated, single output dc to dc converter module, providing up to 240w output with a maximum baseplate operating temperature of 85c with no derating. the ak80a features adjustable output voltage, current limit adjust and temp monitor. special features ? high efficiency - up to 87% ? 500khz fixed switching frequency ? 85c baseplate/ case operating temperature - no derating ? low output ripple and noise ? excellent transient response ? high reliability - over 1 million hours mtbf ? wide input voltage range ? parallelable with current share ? temperature monitoring output ? overtemperature and short circuit protection ? adjustable output voltage and current limit current sensing and control pwm control and gating osc +in -in cshare enable clk in clk out temp mon v adj pg/id -sense +sense -out +out 21 24 26 29 1 4 2 31 32 9 8 7 11 internal temperature sensor id resistor 6 3 primary side secondary side c lim adj 10 output detection over- voltage protection voltage sensing and control 300vmodules only mosfet switcher 5 s com pri aux 12 pri aux pg/id 2 +sense 1 3 v adj 4 - sense clk in 8 clk out 7 c share 6 s com 5 9 enable 10 c lim adj 11 temp mon 12 pri aux + output - + input - 31 32 21 22 23 24 26 27 28 29 ampss tm power module
rev. 05 aug 00 ampss ? reference manual specifications 5 model number in pu t voltage output voltage output current output power a k 80a -048l-033f50 48v 3.3v 50a 165w a k 80a -048l-050f40 48v 5v 40a 200w a k 80a -048l-120f18 48v 12v 18a 216w a k 80a -048l-150f16 48v 15v 16a 240w a k 80a -048l-240f10 48v 24v 10a 240w a k 80a -024l-033f40 24v 3.3v 40a 132w a k 80a -024l-050f30 24v 5v 30a 150w a k 80a -024l-120f14 24v 12v 14a 168w a k 80a -024l-150f12 24v 15v 12a 180w a k 80a -024l-240f08 24v 24v 8a 192w all modules are designed to meet the following specifications: ets300-132-2 ets300-386-1 (1) en55022-a (1) en55022-b (1) en41003 iec6100-44 (1) iec6100-45 (1) iec950 vde0871-a (1) vde0878-a (1) btnr2511(5) (!) (1) require additional external circuitry for full compliance. please refer to application section of this manual or contact technical support office for further information. ordering information please contact astec for information on other output voltages, power ranges and configurations. safety ul: ul1950 csa: csa c22.2 no.950 vde: vde 0805 (48vin only) en60950 (48vin only) ce: ce mark (48vin only) please contact astec for information on specific module approvals. note: ensure all modules are used according to the installation instructions provided with each module.
ak80a e conomy s er i es rev. 06 aug 00 ampss ? reference manual 6 specifications electrical characteristics are guaranteed over the full baseplate/ case temperature range (0 to 85c) and for the full range of input voltage (v i ) and for the full load range (0 to i o rated). except where indicated , +sense and -sense are connected to the output terminals at the point of measurement, enable is connected to s com. all other pins are left floating. definitions v i , v o and i o are actual operating conditions, v inom , v onom and i orated are nominal ratings. p rim ar y c on tr ol p ins t em p m o n -0.5 to 7 vd c c s h a re -0.5 to 7 vd c clk o u t -10 to 10 vd c clk in -10 to 10 vd c c lim adj -0.5 to 7 vdc p ri a u x -0.5 to 14vd c ena ble -0.5 to 20 vd c n ote: rela tive to -in pu t/ s c om secondary control pins +sense v o - 0.5 to v o + 0.5 vd c -sen se -0.5 to 0.5 vd c v a d j -0.5 to 7 vd c p g/id -0.5 to v o + 0.5vd c note : v o = module output voltage n ote: rela tive to -ou tput general 48v input 24v input continuous input voltage 72v 36v input surge voltage (1 sec) 75v (continuous) 38v isolation, input to output* 2100vdc 1500vdc isolation input to baseplate* 2100vdc 1500vdc isolation, output to baseplate* 500vdc 500vdc operating temperature (baseplate)/ cas e 0 to 85c storage temperature -40 to 105c operating relative humidity (non-condensing) 10% to 95% storage relative humidity (non-condensing) 95% max altitude (operating) < 3000m altitude (storage) < 9000m lead temperature (soldering 5 seconds) 235c electrical specifications absolute maximum ratings ? all models exceeding the specified absolute maximum ratings may severely damage the module. these ratings are intended as guidelines for absolute worst case operating conditions and are not to be interpreted as recommended operating condition
rev. 05 aug 00 ampss ? reference manual specifications 7 pin connections - all models input pins pi n no pi n name type de scr ipti on re comme nde d conne ctions 31 +input input power input - pos itive a 220f electroly tic capacito r co nnected between the +input and -input pins is rec ommen ded 32 -in pu t in put po wer inp ut - neg ativ e (re turn ) se e + inp ut for reco mme nda tion s output pins pi n no pi n name type desc ription recommended conne cti ons 21-24 +output output power output - positive en su re g oo d electrical co nn ection and su fficien t co pp er o n pcb la y outs 26-29 -output output power output - negative see +output for recommendations cont rol pins pin no pin name type description recommended connections 1 +sense input used for remote s ense functio n to compensate for load bus resistance if remo te sensing is not required connect to +output pins 21-24 of th e module 2pg/idoutput high level output (v pg/id = v o ) indicates module converter is runnin g. can also be used to identify the nomin al output voltag e of the mod ule by measu ring resistan ce between pg/id and +sense id res istance = [v o(nom) ]k w . leave unconnected if not used 3 v adj input used to adjust mo dule output voltag e leave unconnected if not used 4 -sense input used for remote s ense functio n to compensate for load bus r es i sta n ce if remo te sensing is not required connect to -output pins 26-29 of the module 5 s com refere nce ne g at iv e referen c e fo r all p rim ar y side si g nals connect to negative side of p rimary contro l and monitorin g circuitr y 6 c sha re input/output allows modules connected in parallel to accurately share cu rren t connect to c sha re pins of other modules. leave un connected if not used 7 clk out outpu t provid es a 1m hz clock outpu t for syn chronizatio n with other modules capacitor coupled output. leave uncon nected if no t used 8 clk in input a ccep ts a 1m hz c lock i nput for synch ronization with other modules capacitor coupled input. leav e uncon nected if no t used 9 enable input enables or disables the out p ut of the mo dule m ust be connected to s com pin or driven to <0.8v to enable the output of the mo dule 10 c lim adj input u s e d t o a d ju s t t h e c u rre n t lim it set point leave unconnected if not used 11 temp mon output provid es a voltage signal propo rtional to th e internal absolu te temperature of the module leave unconnected if not used 12 pri a ux input p rim a r y a u xilia ry s upply. allo ws extern al capacitan ce or extern al a u xilia r y su pp l y to be connected to the module to allow start-u p into high capacita nce loads normal unused. leave uncon nected. w hen required, co nnect capacitor to s- c o m o r c o n n e c t e xt e rn a l 12v a u xilia ry supply pg/id 2 +sense 1 3 v adj 4 - sense clk in 8 clk out 7 c share 6 s com 5 9 enable 10 c lim adj 11 temp mon 12 pri aux + output - + input - 31 32 21 22 23 24 26 27 28 29 ampss tm power module
ak80a e conomy s er i es rev. 06 aug 00 ampss ? reference manual 8 insulation - all models control signals control function conditions parameter min typ max units pg/id power good converter running : v pg/id 100 %v o / identification function i orated >i o > 1a converter not running v pg/id 1.0 v 3.3 v outpu t res is tan ce, pg/id 3.23 3.3 3.37 kw 5v o utput to +output 5.00 5.1 5.20 kw 12v o utput 11.76 12 12.24 kw 15v o utput 14.70 15 15.30 kw 24v o utput 23.52 24 24.48 kw v adj - voltage adjust a res istor of r connected between v adj and +sense where : v o 90 %v onom a k80a -xxxl-033fy y r=1.2kw a k80a -xxxl-050fy y r=2.4kw a k80a -xxxl-120fy y r=27kw a k80a -xxxl-150fy y r=39kw a k80a -xxxl-240fy y r=82kw v adj connected to -sense v o 110 %v onom c share - current share c share pins of modules in c share accuracy 5 15 %i o rated function* parallel connected max no. of units 5 clk out - clock output v clk ou t 4.4 5 vp-p clk in open clock freq. 0.98 1 1.02 mhz max fan out 2 clk in - clock input v clk in 4.4 5.5 vp-p clock freq 0.9 1 1.1 mhz pri aux external capacitor external capacitiance 0 tbd f capacitor voltage rating 25 v external au x vcc 10 12.0 14 v i aux current drawn from external supply 0.2 0.3 a enable - module enable module enabled v enable 00.8v module dis abled v enable 210v c lim adj - current limit adjust c lim adj connected to s com c lim set point 20 %i orated c lim adj open c lim set point 115 %i orated temp mon - temperature v t m on sen sitivity 9.8 10 10.2 mv/c monitor signal source impedence 1 kw notes : each module must supply min 5% of rated current to ensure the module and the c-share signal are in operation when operating in parallel. insul a tion parameter conditions min typ max units inp ut-o u tp ut ins u latio n resis tance 500vdc 10 m w input-baseplate insulation resistance 500vdc 10 m w output-baseplate insulation resistance 500vdc 10 m w
rev. 05 aug 00 ampss ? reference manual specifications 9 electrical specifications for 24v input models input characteristics parameter conditions min typ max units input voltage 182436v input surge voltage (1 second) 38 v input low line power on voltage module power on 15 17.5 v in p u t lo w lin e p o w e r o ff v o lta g e m o d u le s h u td o w n 50 80 % v ion no load input power v i = v ino m 15 w input capacitance 12 f transient characteristics parameter conditions min typ max units t u rn -o n t ime 100 1000 ms ec transient response (25% to 75% load change @ 0.1a/s, recovery to 1% v o ) step-load excursion 10 %v o step-load response 300 s output characteristics p aram eter condition s min typ max units nominal (factory set) output voltage a k80a -024l-033f40 3.3 v a k80a -024l-050f30 5.0 v a k80a -024l-120f14 12.0 v a k80a -024l-150f12 15.0 v a k80a -024l-240f08 24.0 v output voltage set point accuracy t c = +25c, v i = v in o m , i o = i orated -1 1 %v onom remote sense compensation 1 v i = v imi n 0.5 v output voltage adjust 90 110 %v onom nominal (factory set) output a ll models : 120 130 140 %v onom overvoltage protection trip point except a k80a -024l-033f40 130 145 160 %v onom line regulation v imi n to v imax 0.2 %v onom load regulation 0 to i omax a ll m o d e ls 0 .5 %v onom except a k80a -024l-033f40 150 mv noise and ripple 20mhz bandwidth 3 %v onom output current a k80a -024l-033f40 0 40 a a k80a -024l-050f30 0 30 a a k80a -024l-120f14 0 14 a a k80a -024l-150f12 0 12 a a k80a -024l-240f08 0 8 a output current limit v o dropped to 90% of v onom 105 115 125 %i orated short circuit current (average current) 85 %i orated m aximum lo ad capacitan ce resistive lo a d sta rt up (pri a ux left open) a k80a -024l-033f40 200000 f a k80a -024l-050f30 150000 f a k80a -024l-120f14 85000 f a k80a -024l-150f12 80000 f a k80a -024l-240f08 9000 f temperature coefficient per c baseplate temperature 0.02 %v o /c overtemperature shutdown baseplate temperature 87 110 c efficien cy v o = v onom , v i = v in om , i o = i orated a k80a -024l-033f40 73 74 % a k80a -024l-050f30 80 81 % a k80a -024l-120f14 85 86 % a k80a -024l-150f12 85 86 % a k80a -024l-240f08 85 86 %
ak80a e conomy s er i es rev. 06 aug 00 ampss ? reference manual 10 electrical specifications for 48v input models transient characteristics parameter conditions min typ max units t u rn -o n t ime 100 1000 ms ec transient response (25% to 75% load change @ 0.1a/s, recovery to 1% v o ) step-load excursion 10 %v o step-load response 300 s output characteristics parameter c onditions min typ max units nominal (factory set) output voltage a k 80a -048l-033f50 3.3 v a k 80a -048l-050f40 5.0 v a k 80a -048l-120f18 12.0 v a k 80a -048l-150f16 15.0 v a k 80a -048l-240f10 24.0 v output voltage set point accuracy t c = +25c, v i = v ino m , i o = i o rated - 1 1 %v onom remote sense compensat i on 1 v i = v imin 0 .5 v output voltage adjust 90 110 %v onom nominal (factory set) output all models : 120 130 140 %v onom overvoltage protection trip point except a k80a -048l-033f50 130 145 160 %v onom line regulation v imin to v imax 0.2 %v onom load regulation 0 to i omax a ll m o d u le s 0 .5 %v onom except a k 80a -048l-033f50 150 mv noise and ripple 20mhz bandwidth 3 %v onom o utp ut curren t a k 80a -048l-033f50 0 50 a a k 80a -048l-050f40 0 40 a a k 80a -048l-120f18 0 18 a a k 80a -048l-150f16 0 16 a a k 80a -048l-240f10 0 10 a outp ut curren t limit v o dropped to 90% of v onom 10 5 11 5 12 5 %i o rated s ho rt circuit c urren t (av erag e cu rrent) 40 %i o rated m aximum load capacitance resistive loa d sta rt up (pri a u x left o pen ) a k 80a -048l-033f50 6800 f a k 80a -048l-050f40 3300 f a k 80a -048l-120f18 500 f a k 80a -048l-150f16 470 f a k 80a -048l-240f10 330 f temperature coefficient per c baseplate temperature 0.02 %v o /c overtemperature shutdown baseplate temperature 87 110 c efficiency v o = v onom , v i = v inom , i o = i o rated a k 80a -048l-033f50 71 72 % a k 80a -048l-050f40 80 82 % a k 80a -048l-120f18 85 87 % a k 80a -048l-150f16 84 85 % a k 80a -048l-240f10 85 86 % input characteristics parameter conditions min typ max units input voltage 36 48 72 v input surge voltage continuous 75 v input low line power on voltage module power on 27 35 v inpu t lo w lin e p ower o ff vo ltage m od ule sh ut do wn 50 80 % v ion no load input power v i = v inom 10 w input capacitance 5.0 f
rev. 05 aug 00 ampss ? reference manual specifications 11 functional description this section explains how to implement the functions found on the ak80a economy series. remote sense (+sense, -sense) connect the +sense and -sense pins directly to the load to allow the module to compensate for the voltage drop across the conductors carrying the load current. if remote sensing is not required (for example if the load is close to the module) the sense pins should be connected directly to the module?s output pins to ensure accurate regulation. note: if the sense leads fail open circuit, the module will revert to local sense at the output pins. incorrect connection of sense leads may damage the module output voltage adjustment (v adj) the output voltage of the module may be accurately adjusted by up to 10% of the nominal factory set output. adjustment is carried out using a resistor connected as to control adjust current i 1 and i 2 . load +sense -sense +o/p -o/p 1 4 3 2 0.5v max voltage at load module output voltage load current volts +i/p -i/p 9 8 12 5 +i/p -i/p 9 8 12 5 enable control (enable) the enable pin is a ttl compatible input used to turn the output of the module on or off. the module output is enabled when the enable pin is connected to s com or driven to a logic low of <0.8v (but not negative) with respect to s com. the output is disabled when the enable pin is open or driven to a logic high >2v with respect to s com. if the ak80a is operated in parallel, all enable pins must be connected in parallel to ensure all modules are enabled simultaneously. - sense + sense 1 4 +o/p -o/p 3 2 r adj-down - sense + sense 1 4 +o/p -o/p 3 2 r adj-up circuit configuration to increase output voltage circuit configuration to decrease output voltage model vs r1 r2 r3 r4 r5 vo = (90% to 100%) vonom 5.0v 2.5 v open 2k7 300 2k4 8k2 12.0v 2.5 v open 6k2 0 1k6 10k 24.0v 2.5 v open 12k 0 1k5 11k note: radj tolerance must be => 1% to achieve a 3% set accuracy 15.0v 2.5 v open 8k2 0 1k6 11k i 1 = i 2 = vs r1 vo - vs r2 = r adj-up 1 - r5 v0 = (100% - 110%) vonom 1 vs i 1 + i 2 - r3 1 r4 - i 1 = i 2 = vs r1 vo - vs r2 = r adj-down vo - vs + ( i 1 + i 2 ) x r3 x r4 - r5 vs - (i 1 + i 2 ) x (r3 + r4) 3.3v 2.5v open 1k8 2k4 3k3 2k4
ak80a e conomy s er i es rev. 06 aug 00 ampss ? reference manual 12 power good/identification (pg/id) this pin provides an indication that the module's converter is working, and can also be used to identify the factory set output voltage of the module. the pg/id pin goes high to the level of the output voltage (v o ) to indicate that the module is operating and delivering power. the output goes low if the converter stops operating due to a fault such as an overtemperature or overvoltage condition. the pg/id pin will also go low if the module is disabled via the enable pin. the resistance between the pg/id pin and the +ve output of the module can be used to determine the output voltage of the module with no power applied according to the table shown: out put vol t ag e ( v) r esi st ance ( k ? ? ? ? ) 3. 33. 3 55. 1 12 12 15 15 24 24 current sharing (c share) to ensure that all modules in a parallel system accurately share current, the c share and s com pins on each module should be connected together as shown. the enable pins of each of the modules should be connected either directly to s com or to a common enable control to ensure that all modules are enabled simultaneously. only after the module is enabled will c share become active. only when all c share signals are active will power be delivered to the load. clock signals (clk in, clk out) the module's internal clock is accurate and stable over its full operating range and synchronization is not normally required, but it can reduce noise in paralleled systems. clock signals can be wired in series (the clk out pin of one module to the clk in pin of the next etc) in which case all the modules will be synchronized with the first module in the chain. alternatively, an external clock signal of 5vpk-pk at 1mhz10% can be connected to the clk in pins of all the modules. if the clock input to any module fails, the module will automatically switch back to its internal clock and will continue to operate normally. the clk in and clk out signals are ac coupled, so any module can clock another module regardless of polarity. 1 12 pg 1.0v vo converter not running converter running +v o -v o output to load v 24v, 48v, 300v (nom) models +sense -sense +o/p -o/p 1 4 3 2 +sense -sense +o/p -o/p 1 4 3 2 +i/p -i/p 9 8 12 5 to c share of next module +i/p -i/p 9 8 12 5 to enable of next module to s com of next module from c share of previous module fromenableof previousmodule from s com of previous module +i/p -i/p 9 8 12 5 to clk in of next module +i/p -i/p 9 8 12 5 from clk out of previous module
rev. 05 aug 00 ampss ? reference manual specifications 13 temperature monitoring (temp mon) the temp mon pin provides an indication of the module's internal temperature.the voltage at the temp mon pin is proportional to the temperature of the module baseplate at 10mv per c, where: module temperature (c) = (v temp mon x 100) - 273 the temperature monitor signal can be used by thermal management systems (e.g. to control a variable speed fan). it can also be used for overtemperature warning circuits and for thermal design verification of prototype power supplies and heatsinks. pri aux the ability of the ak80 to start highly capacitative loads can be extended by adding an external capacitor or adding an external auxiliary supply. +i/p -i/p 9 8 12 5 v 100 ?c 50 ?c 0?c module internal temperature 2.73v 3.23v 3.73v v temp mon 2.98v 3.48v -20 ?c 2.53v current limit adjustment (c lim adj) a 'bounce mode' current limiting circuit protects the module under overload or short circuit conditions. with the c lim adj pin left unconnected the current limit is factory set to 115% of the module's rated output, but may be adjusted across the range from 20% to 100% using a resistor. +i/p -i/p 9 8 12 5 layer11 4 +o/p o/p 3 2 5 6 8 7 c aux + - +i/p -i/p 9 10 11 12
ak80a e conomy s er i es rev. 06 aug 00 ampss ? reference manual 14 maximum load capacitance layer11 4 3 2 5 6 8 7 external aux +12v common +i/p -o/p 91011 12 mode l c aux none 100f 470f 1000f 2200f ak80a- 024l-033f40 >200000 ak80a- 024l-050f30 150000 ak80a- 024l-120f14 85000 ak80a- 024l-150f12 80000 ak80a- 024l-240f08 9000 ak80a- 048l-033f50 6800 tbd tbd tbd tbd ak80a- 048l-050f40 3300 tbd tbd tbd tbd ak80a- 048l-120f18 500 tbd tbd tbd tbd ak80a- 048l-150f16 470 tbd tbd tbd tbd ak80a- 048l-240f10 330 tbd tbd tbd tbd alternatively an external auxiliary supply can be used. with an external auxiliary supply, the ak80a can be used with any value of load capacitance
rev. 05 aug 00 ampss ? reference manual specifications 15 design considerations remote loads if the sensed load is some distance from the module, the module's output voltage may rise sufficiently to trigger the ovp protection circuit during a step load change due to bus inductance. fitting a decoupling capacitor at the load can reduce this effect. it should be noted that a distributed power solution, using ampss tm modules placed close to their loads, will optimize transient response. input bulk capacitors electrolytic bulk reservoir capacitors placed close to the module input pins are recommended to ensure the module is fed with a low source impedance. for the ak80a economy series module typical values are 220f/100v for 48v modules and 220f/50v for 24v modules. parallel connection considerations a master-slave configuration is not required for ampss tm modules. ak80a modules may be connected in parallel using a simple wiring scheme. current sharing in multi-module paralleled systems, all modules will share current to within 5% (typical) of the rated load current per module when the c share pins of each module are connected together. the +sense and -sense pins of each module should be connected to common points as close as possible to the load. note: after a module is enabled the c share becomes active. only when all c share signals are active will power be delivered to the load. for this reason the ak80a series is unsuitable for hot pluggable or redundancy systems. synchronization modules are synchronized by connecting the clk out pin of one module to the clk in pin of the next. consecu- tively connected modules operate out of phase with each other, resulting in ripple cancellation at the inputs and outputs of paralleled modules. if the clock input to a module fails, it will automatically revert to its internal clock and continue to operate at full power. input fusing ampss modules do not have an in-line fuse fitted internally. in order to comply with csa, vde and ul safety regulations it is recommended that a fuse of the following rating be fitted at the module's input. in pu t f u s e r a ti n g 48v 10a / 250v 24v 15a /250v + +i/p -i/p 220 f v i +sense -sense 1 4 3 2 +o/p -o/p load load +sense -sense c share 8 1 4 +sense -sense c share clk out 5 clk in +o/p -o/p 3 2 9 12 1 4 5 3 2 12 8 9 s com s com enable enable common enable
ak80a e conomy s er i es rev. 06 aug 00 ampss ? reference manual 16 break regulation ak80a economy series modules are designed to deliver full rated output current at up to 0.5v above v o nom at the minimum specified input voltage. conducted emi although ampss tm modules contain both common mode and differential mode input emi filtering, power supply systems using these modules will require additional emi filtering to enable the system to meet relevant emi standards. ak80a modules have an effective input to ground (baseplate) capacitance of 500pf. this should be accounted for when calculating the maximum emi ?y? capacitance to meet ground leakage current specifications. thermal data natural convection thermal impedance of the ak80a package without a heatsink is approximately 4c/w. a standard horizontal fin heatsink available from astec (part number apa501-80-002) with 11mm fins and 8mm pitch, will reduce module thermal impedance to 1c /w with a forced air flow of 250 lfm when mounted with a thermal pad (astec p/n apa502-80-001) between heatsink and module. overtemperature protection if the module's internal temperature exceeds 95c, the module will latch off. to reset the module the input supply must be cycled off and then on again, allowing a period of time for the module to cool down. overtemperature shutdown can also be programmed to occur at lower temperatures by using the temp mon output to control the enable pin. 0 0.2 0.4 0.6 0.8 1 1.2 0 200 400 600 800 1000 vair (lfm ) thermal resistance basepl ambient (c/w) forced c onvection for a pa 501-80-002 at 200w o utput 90% 100% 110% 36 40 72 %v onom +0.5v v i (48v input modules) 90% 100% 110% 180 200 400 %v onom +0.5v v i (300v input modules) typical typical 90% 100% 110% 18 20 36 %v onom +0.5v v i (24v input modules) typical 9 8 12 5 +i/p -i/p + - protective earth baseplate
rev. 05 aug 00 ampss ? reference manual specifications 17 mtbf predicted mtbf for the ak80a economy series is greater than 1,000,000 hours at maximum rated output and 50c baseplate temperature. output ripple and noise ak80a economy series modules are designed to generate very low ripple and noise. when mounted on logic boards, for example, sufficient decoupling is normally provided by the components used to decouple the logic ics, and no additional decoupling is required.
ak80a e conomy s er i es rev. 06 aug 00 ampss ? reference manual 18 application examples ac input design parallel connection design load +sense -sense +o/p -o/p +i/p -i/p 9 8 1 4 current limit adjust output voltage adjust enable (close to enable) 3 2 12 5 l n e 220vac + protective earth + + vdc in + - +sense -sense +o/p -o/p +i/p -i/p 9 8 1 4 3 2 12 5 +sense -sense +o/p -o/p +i/p -i/p 9 8 1 4 3 2 12 5 load clk out clk in c share c share s com s com enable input enable enable
rev. 05 aug 00 ampss ? reference manual specifications 19 baseplate (connect to protective earth) 4 control pins ? 0.64,2.54grid 0.05 ( ? 0.025,0.1grid0.002) 8 control pins ? 0.64,2.54grid0.05 ( ? 0.025,0.1grid0.002) 2 input pins ? 1.52(0.060) 0.05(0.002) 8 output pins ? 1.52(0.060) 0.05(0.002) 116.8(4.60) 61.0(2.40) 29 28 27 26 24 23 22 21 32 31 12.7 (0.50) 106.68(4.200) 50.80 (2.000) 22.86 (0.900) 3.81(0.150) typ 7.62 (0.300) 15.24 (0.600) 7.5(0.30) typ 5.1(0.20) typ 4.1(0.16) typ notes: 1. all dimensions in mm and (inches) 2. baseplate must be connected to protective earth 3. general tolerance: .x 0.5(0.02) .xx 0.25(0.010) 4. surface flatness: concave 0.12mm max convex 0.38mm max ? 3.81(0.150) r3.8(0.15) typ 10.16 (0.400) 4 1 2 3 5 8 912 mechanical information dimensions the dimensions are given in mm (inches). note that the baseplate must be connected to protective earth before power is supplied to the module.
recommended pcb layout the ak80a economy series module may be mounted to a board either by soldering or by using spring sockets. materials : control pins are tin plated phospher-bronze. input and output pins are tin plated copper. hole size for pcb direct soldering hole size for spring socket mounting* hole size for m3.5 machine screw * spring sockets are available from astec in packs of 20 control pin sockets and 15 power pin sockets, partno. apa504-00-001. sockets are not suitable for output current greater than10a per pin. a ? 2.00+0.15/-0 ( ? 0.079+0.006/-0) ? 4.5+0.08/-0 ( ? 0.177+0.0031/-0) for m3.5 b ? 2.00+0.15/-0 ( ? 0.079+0.006/-0) ? 2.670.05 ( ? 0.1050.002) c ? 1.00+0.15/-0 ( ? 0.039+0.006/-0) ? 1.370.05 ( ? 0.0540.002) recommended hole size table:- 21 4 1 29 2 3 32 31 50.80 (2.000) 22.86 (0.900) 106.68(4.200) 15.24 (0.600) 3.81(0.150) typ 7.62 (0.300) 2.54 (0.100) c a b 2.54grid 0.05 (0.10grid0.002) view from pcb component side notes: 1. pcb component side view is shown. 2. all dimensions in mm and (inches). 3. general tolerance: .xx 0.1(0.006). 5 8 912 10.16 (0.400)
heatsink mounting information heatsinks for ampss tm modules are available in a variety of sizes and fin orientation. mounting kits and thermal pads are also available. the table below shows the options available for ak80a economy series. a heatsink mounting kit provides the most convenient way to mount the heatsink to the module and then mount the assembly onto a circuit board 1 2 des cription model number dimensions free air thermal inches mm resistance heats in k, "80" s ize, vertical fin. a pa 501-80-001 4.53x2.32x0.6 115x59x15 2.7c/w heats in k, "80" s ize, horizo ntal fin a pa 501-80-002 4.53x2.32x0.6 115x59x15 2.4c/w heats in k, "80" s ize, vertical fin. a pa 501-80-003 4.53x2.32x0.9 115x59x22.5 2.2c/w heats in k, "80" s ize, horizo ntal fin a pa 501-80-004 4.53x2.32x0.9 115x59x22.5 2.0c/w heats in k, "80" s ize, vertical fin. a pa 501-80-005 4.53x2.32x1.5 115x59x37 2.0c/w heats in k, "80" s ize, horizo ntal fin a pa 501-80-006 4.53x2.32x1.5 115x59x37 1.7c/w heats in k, "80" s ize, low profile a pa 501-80-007 4.55x3.50x0.5 115.6x89x12 2.2c/w thermal pad, "80" size apa502-80-001 mounting kit, tapped studs apa503-00-001 m ou nting kit, solder stu ds a pa 503-00-002 mounting kit, tapped studs apa503-00-007 for low profile heatsink m ou nting kit, solder stud s a pa 503-00-008 for low profile heatsink spring sockets (20 cont. 15pwr) apa504-00-001 to provide optimal thermal contact between heatsink and module, it is recommended that the mating surface of the heatsink should have a surface flatness of no greater than 0.1mm. the use of a thermal pad or thermal grease is also recommended. ampss tm modules may be retained by their input and output pins only, or may be fixed to the board using bolts screwed into the tapped studs which are provided as part of the mounting kit. in both cases the studs provide clearance between the module and the circuit board to facilitate pcb cleaning operations. note: 1). baseplate and heatsink must be connected to protective earth 2). mechanical support must not induce twist in the module baseplate and must incorporate strain relief, e.g. spring washers.
the recommended torque of using ampss mounting kit for module/heatsink is: screw s ize torq ue m3 4-6kg -cm (3.5-5.2 lb -in) m3.5 6-8kg -cm (5.2-6.9 lb -in) torque sequence: it is assumed that all four mounting screws are being torqued to a common surface. other thermal management schemes are at customer discretion as long as the maximum thermal rating of the specific module is not exceeded. heatsink torquing sequence 1 2 4 3
europe astec europe ltd. astec house, unit 9 waterfront business park merry hill, dudley west midlands, dy5 1lx u.k. tel : 01384-842211 fax : 01384-843355 north america astec america, inc,. 5810 van allen way, carlsbad ca 92008, usa. tel : 760-930-4600 fax : 760-930-0698 for further information contact : asia astec agencies limited units 2111 - 2116, level 21 tower 1, metroplaza 223, hing fong road kwai fong n.t. hong kong tel : 852 2437-9662 fax : 852 2402-4426 apa701-ak80 rev. 04 mar 99

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