hi-rel design ? wave solderable package ? all ceramic capacitors ? surface mount magnetics ? withstands 5000g features single output ? replaces apex dhc2803s & dhc2805s ? no derating -55c to +125c ? wide supply range 12v to 50v ? high isolation 500v ? high power density 17w/in 3 ? output voltage adjustment standard ? remote shutdown ? operates to 11v in at 5w ? available with 3.3v or 5v outputs ? see dac2800s series for 12v and 15v versions description the DHC2800S series of dc-dc converters provides the ruggedness, reliability, and features required to meet the advanced design challenges of todays hi-rel market. this is accomplished while retaining a power density of 17 w/in 3 and 425 mw/gram of power/package performance. the use of advanced substrate and reflow soldering techniques during construction results in a rugged, cost-effective, and com- pletely solderable package. DHC2800S hybrid converter series utilizes all ceramic capacitors and surface mount magnetics to provide reliable operation at all operating temperatures while surviving very high g forces. DHC2800S standard features include output fault monitor- ing and/or turn on voltage point programming via the shut- down pin. all three functions may be implemented simulta- neously with a minimum of external components. an output voltage adjustment/load compensation pin is also standard. fault tolerant design protects these converters from most external circuit faults. the output and output adjust pins will withstand +35 v while the shutdown pin will withstand +50 v protecting the converters from a variety of system or board faults i.e. solder bridges etc. unique load fault protection circuitry allows this converter to pull up loads having difficult static load line characteristics and allows short term load excursions significantly beyond ratings in most applications. a transformer isolated forward converter topology operat- ing at a switching frequency of 400 khz allows operation over a wide input voltage range. internal filtering of both input and output eliminates the need for external capacitors in many applications. the 8-pin dip package is hermetically sealed and isolated from the internal circuits. heat sinking is recommended for full power operation at elevated ambient temperatures. external connections block diagram p w m feed forward controller error amplifier reference and isolation 3 1 2 6 5 7 typical application with options 4707 dey road liverpool, n.y. 13088 m.s.kennedy corp. (315) 701-6751 DHC2800S series iso-9001 certified by dscc 6w dc-dc converters rev. a 3/01 1 1 2 3 4 5 +output -output adjust/comp no connection shutdown plus 8 7 6 case -input +input
notes: 1. unless otherwise stated: t c = 25c, v in = 28v, i out = i out max. 2. derate power linearly to zero from 125c to 135c. 3. regulation measured between pin 1 and pin 2 1/6" from case. 4. recovery spec assumes that converter has been off for at least 500ms. 5. dhc2803s i out max = 2.0adc when voltage is adjusted to 3.0vdc, v in = 13-50vdc, and c load = 100f. 6. dhc2803s p out max = 6w when v in = 13-50vdc caution: the internal substrate contains beryllia (beo). do not break the seal. if accidentally broken, do not crush, machine, o r subject to temperatures in excess of 850c to avoid generating toxic fumes. absolute maximum ratings specifications DHC2800S series absolute maximum ratings dhc2803s dhc2803s dhc2803s dhc2803s dhc2803s dhc2805s dhc2805s dhc2805s dhc2805s dhc2805s input voltage range (pin 7 to 6 or 5) 0 C 50vdc 0-50vdc input transient (pin 7 to 6) 80v @ 50ms 80v @ 50ms output withstand (pin 2 to 1 or 3) 35vdc 35vdc output current (continuous) 2adc 5 1.2adc temperature, storage C65c, 150c C65c, 150c temperature, pin soldering 10s 300c 300c specifications parameter test conditions 1 min typ max min typ max units steady state characteristics input voltage range 12 28 50 12 28 50 vdc output voltage v in ; min ? max vdc @ i min 3.2 3.3 3.4 5.00 5.05 5.1 vdc output current v in ; min ? max vdc 180 1520 120 1200 madc v in ; 13 ? max vdc 1820 5 madc efficiency 61 66 64 69 % output ripple voltage bandwidth 10khz ? 1mhz 38 80 30 80 mvrms input ripple current bandwidth 10khz ? 1mhz 30 100 30 100 marms output power 2 .5 5.0 6 .6 6.0 w line regulation v in ; min ? max 3 6 15 6 15 mvdc load regulation i out ; min ? max 3 10 25 10 25 mvdc temperature coefficient .006 .006 %/c temperature range, case 2 C55 125 C55 125 c quiescent current i out = 0a 38 45 38 45 madc inhibited vpin5; < 8vdc .09 1.25 2.5 .09 1.25 2.5 madc isolation characteristics (input/output/case) leakage resistance v test = 500vdc 100 100 m w leakage capacitance f = 10khz 55 60 pf dynamic characteristics line step response v in ; t r , t f = 10s voltage change v in ; 16 ? 40 vdc 350 300 mv recovery time (95%) 30 30 s load step response i out ; t r , t f = 10s voltage change i out ; 50% ? max adc 700 700 mv recovery time (95%) 30 40 s dynamic characteristics start-up overshoot v in ; 0-50 vdc 0 400 0 400 mv shutdown delay v pin5 ; > 10vdc ? <8vdc 220 500 220 500 s shutdown recovery time 4 v pin5 ; < 8vdc ? > 10vdc 60 60 ms caution dhc2803s dhc2803s dhc2803s dhc2803s dhc2803s dhc2805s dhc2805s dhc2805s dhc2805s dhc2805s package thermal specifications min typ max units resistance, case to air 30 c/w temperature rise, junction to case 10 15 c rev. a 3/01 2
typical performance graphs dhc2803s line transient response 0.0 2.0 output current, i out (a) 10 12 14 16 low line drop out input voltage, v in (v) 0.5 1.0 1.5 10k 90k 60k 20k 30k 40k input voltage, v in (v) time, t (500 sec/div) load transient response 1000 f line transient response efficiency contours 11 30 50 40 20 output response, x (units/div) output current, i out (a) 1.44 .18 .36 .72 1.08 1.8 1.44 .18 .36 .72 1.08 1.8 1.44 .18 .36 .72 1.08 1.8 set point resistor, r sp ( w ) time, t (5msec/div) 12 16 20 24 28 turn on threshold turn on voltage, e to (v) turn on response 100 200 400 frequency, f (hz) ?00 audio rejection audio rejection, a v (db) 0 ?0 ?0 1k 2k 4k 10k 20k 40k 100k ?0 ?0 response, x (units/div) 3.3v 0v 0v 28v v out v in temp = 25 c 30% 40% 50% 55% 60% 63% 65% 67% 68% 69% 70% input voltage, v in (v) efficiency contours output current, i out (a) temp = 125 c 30% 40% 50% 55% 60% 62% 64% 65% 66% 67% input voltage, v in (v) efficiency contours 11 50 40 20 30 11 50 40 20 30 output current, i out (a) temp = ?5 c 30% 40% 50% 55% 67% 68% 68% 60% 65% 66% 63% includes 1000 f on output bus time, t (200 sec/div) time, t (200 sec/div) time, t (200 sec/div) load transient response 100 f output response, x (units/div) output response, x (units/div) output response, x (units/div) includes 100 f on output bus time, t (100 sec/div) load transient response output response, x (units/div) 1.8a 1.8a .9a .9a v out v out v out v out v in v in 11v 16v .9a 80v 40v 1.8a load 1.8a v out i out i out i out 1 v 500ma 1 v 500ma 100mv 20v 50mv 10v 1 v 10 v 1 v 500ma no output bus capcitance v in = 28v i out = 2.0a output dc current rating includes 100 f on output bus rev. a 3/01 3
typical performance graphs dhc2805s line transient response 0.0 1.6 output current, i out (a) 10 12 14 16 low line drop out input voltage, v in (v) 0.4 0.8 1.2 10k 90k 60k 20k 30k 40k input voltage, v in (v) time, t (500 sec/div) load transient response 1000 f line transient response efficiency contours 11 30 50 40 20 output response, x (units/div) output current, i out (a) .96 .12 .24 .48 .78 1.2 set point resistor, r sp ( w ) time, t (5msec/div) 12 16 20 24 28 turn on threshold turn on voltage, e to (v) turn on response 100 200 400 frequency, f (hz) ?00 audio rejection audio rejection, a v (db) 0 ?0 ?0 1k 2k 10k 20k 100k ?0 ?0 response, x (units/div) 5.0v 0v 0v 28v v out v in temp = 25 c temp = 25 c 30% 40% 50% 55% 60% 65% 68% 70% 71% 72% input voltage, v in (v) efficiency contours output current, i out (a) temp = 125 c 30% 40% 50% 55% 60% 63% 66% 68% 69% 70% input voltage, v in (v) efficiency contours 11 50 40 20 30 11 50 40 20 30 output current, i out (a) .96 .24 .12 .48 .78 1.2 .96 .24 .12 .48 .78 1.2 temp = ?5 c 30% 40% 50% 55% 68% 69% 70% 60% 66% 63% includes 1000 f on output bus time, t (200 sec/div) time, t (200 sec/div) time, t (200 sec/div) load transient response 100 f output response, x (units/div) output response, x (units/div) output response, x (units/div) includes 100 f on output bus includes 100 f on output bus includes 100 f on output bus includes 100 f on output bus time, t (100 sec/div) load transient response output response, x (units/div) 1.2a load = 1.2a load = 1.2a load = 1.2a 1.2a 600ma 600ma v out v out v out v out v in v in 11v 16v 600ma 80v 40v 1.2a v out i out i out i out 1 v 500ma 1 v 500ma 100mv 20v 50mv 10v 1 v 10 v 2 v 500ma no output bus capcitance v in = 28v i out = 1.2a output dc current rating rev. a 3/01 4
application information DHC2800S series 3 1 2 50k 10nf output adjust / comp the output voltage of the DHC2800S may be adjusted from 90% to 110% of nominal value by the use of a 50k w potentiometer as shown. adjustment beyond this range is possible however certain characteristics of the converter such as but not limited to input voltage range, efficiency, ripple and temperature performance will change. characterization by the user is recommended in such applications. adjust/comp (pin 3) may be driven by external circuitry referenced to pin 2 (-output) if desired. grounding pin 3 causes voltage to increase (25% typically) while driving pin 3 above 1.3 v causes output voltage to decrease. pin 3 may be driven through 10k w or more if connection of the comp function is also required. the comp function of pin 3 allows capacitive loads as large as 1000 f to be accommodated on the dhc2805s without loss of stability. this feature may be utilized by connecting a 10 nf capacitor between pins 3 and 1. this is generally recommended when low esr load capacitances of 100 f or greater are used. shutdown plus pin 5 is used for remote shutdown, output fault detection, and/or setting the input voltage point at which the converter will turn on as shown in the typical application diagram. no connection to pin 5 is necessary for normal operation of the converter. pin 5 is referenced to the Cinput (pin 7). shutdown may be implemented by simply connecting pin 5 to an open collector logic output or switch rated at 2.5 ma, 25 vdc or higher. input voltage turn on point is programmed with a single resistor from pin 5 to 7. an input turn on/off hysteresis (typically 3.5% of vin) will be observed. this should be considered when making or verifying set point adjustment. the value of the setpoint resistor may be determined by the following: 210 ? 10 3 r = (10% accuracy at 25c) e to C 9.5 set point temperature coefficient is typically +400ppm/c. output fault monitoring is accomplished by observing pin 5 with a high impedance monitoring circuit. pin 5 voltage drops from over 10 v to below 1 v when a load fault causes the converters fault protection circuitry to activate. it will remain low for at least 100 ms and return high. if the load fault is still present pin 5 will return low and the cycle will repeat. a resistor > 400 k w from pin 5 to 7 provides pull down for pin 5 if there is no input setpoint programming resistor already in place. v o normal time normal load fault o i o o load fault response the DHC2800S series of dc-dc converters share load fault philosophies. load fault conditions include short-circuit and severe overload conditions. the dhc2800 converter series responds to load faults by turning off all power conversion circuits for 250 ms and then attempting to restart for 10 ms (typical). the net "on" duty factor during a fault is very low resulting in low converter dissipation and immunity from overheating at 125c. current beyond rated can flow into the load at startup time. this allows the converter to bring up capacitive and other difficult load types more reliably than competing converters. rev. a 3/01 5
the information contained herein is believed to be accurate at the time of printing. msk reserves the right to make changes to its products or specifications without notice, however, and assumes no liability for the use of its products. please visit our website for the most recent revision of this datasheet. m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com note: all dimensions are 0.010 inches unless otherwise labeled. esd triangle indicates pin 1. dhc2805s the above example is an industrial grade 5v single output converter ordering information screening blank= industrial; e= extended reliability; h= class h; k= class k single output output voltage 03=3.3v; 05=5v nominal input voltage general part number rev. a 3/01 6 mechanical specifications
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