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dvehf2800t series 1x030dsd 11314 4th avenue west, suite 206 everett, wa 98204 http://www.vpt-inc.com sales information: phone: (425) 353-3010 fax: (425) 353-4030 e-mail: vptsales@vpt-inc.com 1 high reliability hybrid dc-dc converters with integral emi filter description the dvehf series of high reliability dc-dc converters is operable over the full military (-55 c to +125 c) temperature range with no power derating. unique to the dvehf series is a fault tolerant magnetic feedback circuit. operating at a nominal fixed frequency of 450 khz per stage, these regulated, isolated units utilize well-controlled undervoltage lockout circuitry to eliminate slow start- up problems. these converters are designed and manufactured in a facility qualified to iso9001 and certified to mil- prf-38534 and mil-std-883. this product may incorporate one or more of the following u.s. patents: 5,784,266 5,790,389 5,963,438 5,999,433 6,005,780 6,084,792 6,118,673 features ? high reliability ? very low output noise ? wide input voltage range: 15 to 50 volts per mil-std-704 ? up to 10 watts output power ? fault tolerant magnetic feedback circuit ? no use of optoisolators ? undervoltage lockout ? indefinite short circuit protection ? current limit protection ? industry standard pinout ? high input transient voltage: 80 volts for 1 sec per mil-std-704a ? solder seal hermetic package ? custom versions available ? additional environmental screening available ? no external emi filter required ? meets mil-std-461c and mil-std-461d emc requirements ? protects against conducted susceptibility specified in mil-std-461c, sc01 and cs02 ? non-flanged version available ? mil-prf-38534 element evaluated components figure 1 ? dvehf2800t dc-dc converter ( not to scale )
dvehf2800t series 1x030dsd 2 specifications (t case = -55c to +125c, v in = +28v 5%, full load 5 , unless otherwise specified) absolute maximum ratings input voltage (continuous) 50 v dc junction temperature rise to case +15c input voltage (transient, 1 second) 80 vo lts storage temperature -65c to +150c output power 10 watts lead solder temperature (10 seconds) 270c power dissipation (full load, t case = +125c) 5.0 watts weight (maximum) 50 grams dvehf28512t dvehf28515t parameter conditions min typ max min typ max units static continuous 15 28 50 15 28 50 v input voltage transient, 1 sec 4 - - 80 - - 80 v inhibited - 3.5 6.0 - 3.5 6.0 ma current no load - - 70 - - 70 ma inhibit pin input 4 0 - 1.5 0 - 1.5 v inhibit pin open circuit voltage 4 9.0 11.0 13.0 9.0 11.0 13.0 v uvlo turn on 8.0 - 12.0 8.0 - 12.0 v uvlo turn off 4 4.0 - 8.0 4.0 - 8.0 v v main 4.95 5.0 5.05 4.95 5.0 5.05 v v aux t case = 25c 11.88 12.0 12.12 14.85 15.0 15.15 v v main 4.925 5.0 5.075 4.925 5.0 5.075 v output voltage v aux t case = -55c to +125c 11.4 12.0 12.6 14.25 15.0 15.75 v total 0 - 10 0 - 10 w v main 0.15 - 5.0 0.15 - 5.0 w power 4 v aux 6 either output 0 - 3.5 0 - 3.5 w v main 0 - 1.0 0 - 1.0 a current 3 v aux either output 6 0 - 0.29 0 - 0.23 a v main - 15 50 - 15 50 mv p-p ripple voltage v aux full load 5 , 20hz to 10mhz - 15 50 - 15 50 mv p-p v main - 10 20 - 10 20 mv line regulation v aux v in = 15v to 50v - 15 50 - 15 50 mv v main - 5 20 - 5 20 mv load regulation v aux no load to full load 5 - 10 50 - 10 50 mv cross regulation v aux +v out = 30%, -v out = 70% +v out = 70%, -v out = 30% - - 50 - - 50 mv efficiency full load 5 67 72 - 67 72 - % overload 4 - - 7.5 - - 7.5 w load fault power dissipation short circuit - - 7.5 - - 7.5 w capacitive load 4 - - 500 - - 500 f switching frequency 350 450 550 350 450 550 khz isolation 500 v dc , t case = 25c 100 - - 100 - - m ? mtbf (mil-hdbk-217f) aif @ t c = 55c - 350 - - 350 - khrs
dvehf2800t series 1x030dsd 3 specifications (t case = -55c to +125c, v in = +28v 5%, full load 5 , unless otherwise specified) absolute maximum ratings input voltage (continuous) 50 v dc junction temperature rise to case +15c input voltage (transient, 1 second) 80 vo lts storage temperature -65c to +150c output power 10 watts lead solder temperature (10 seconds) 270c power dissipation (full load, t case = +125c) 5.0 watts weight (maximum) 50 grams dvehf28512t dvehf28515t parameter conditions min typ max min typ max units dynamic v main - 200 500 - 200 500 mv pk load step output transient v aux - 100 400 - 100 400 mv pk v main - 200 500 - 200 500 sec load step recovery 2 v aux half load to full load - 200 500 - 200 500 sec v main - 200 600 - 200 600 mv pk line step output transient 4 v aux - 50 100 - 50 100 mv pk v main - 200 500 - 200 500 sec line step recovery 2, 4 v aux v in = 16v to 40v - 200 500 - 200 500 sec turn on delay - 20 30 - 20 30 msec v main - - 25 - - 25 mv pk turn on overshoot v aux v in = 0v to 28v - - 50 - - 50 mv pk notes: 1. this note intentionally not used. 2. time for output voltage to settl e within 1% of its nominal value. 3. derate linearly to 0 at 135c. 4. verified by qualification testing. 5. 5.0w on v main and 2.5w on v aux . 6. up to 70% of the total auxilia ry power or current can be drawn fr om either of the auxiliary outputs.
dvehf2800t series 1x030dsd 4 block diagram primary housekeeping su ppl y pwm controller pin 2 inh transformer isolated signal feedback power feedforward voltage error amplifiers secondary houskeeping supply in com pin 10 28v in pin 1 +v main pin 7 main com pin 6 +v aux pin 3 -v aux pin 5 emi filter linear re g linear re g aux com pin 4 figure 2
dvehf2800t series 1x030dsd 5 connection diagram 10 in com 2 inh 1 28v in 3 +v aux 6 main com load + - 28 vdc 5 -v aux load aux com 4 7 +v main load figure 3 inhibit drive connection diagrams 10 in com 2 inh 1 28v in optional capacitor bias 12v 10k 10 in com 2 inh 1 28v in optional capacitor bias 12v 10k optoisolator figure 4 ? internal inhibit circuit and recommended drive figure 5 ? isolated inhibit drive (shown with optional capacitor for turn-on delay) (shown with optional capacitor for turn-on delay)
dvehf2800t series 1x030dsd 6 efficiency performance curves (t case = 25c) v in = 15v v in = 28v v in = 50v 50 55 60 65 70 75 2.5 5 7.5 10 output power (w) efficiency (%) figure 7 ? dvehf28512t efficiency (%) vs. output power (w) 50 55 60 65 70 75 2.5 5 7.5 10 output power (w) efficiency (%) figure 8 ? dvehf28515t efficiency (%) vs. output power (w)
dvehf2800t series 1x030dsd 7 emi performance curves (t case = 25c, v in = +28v 5%, full load, unless otherwise specified) figure 9 ? mil-std-461c dvehf2800t figure 10 ? mil-std-461d dvehf2800t
dvehf2800t series 1x030dsd 8 package specifications (non -flanged, solder seal) top view side view pin function 1 28v in 2 inhibit 3 +v aux 4 aux com 5 -v aux 6 main com 7 +v main 8 case 9 n/c 10 in com bottom view figure 11 ? non-flanged, solder seal tin plated package and pinout (dimensional limits are 0.005? unless otherwise stated)
dvehf2800t series 1x030dsd 9 package pin description pin function description 1 28v in positive input voltage connection 2 inhibit logic low = disabled output. connecting the inhibit pin to input common causes converter shutdown. logic high = enabled output. unconnected or open collector ttl. 3 +v aux positive auxiliary output voltage connection 4 aux com auxiliary output common connection 5 -v aux negative auxiliary output voltage connection 6 main com main output common connection 7 +v main positive main output voltage connection 8 case case connection 9 n/c no connection 10 in com input common connection
dvehf2800t series 1x030dsd 10 environmental screening (100% tested per mil-std-883 as referenced to mil-prf-38534) screening mil-std-883 standard (no suffix) extended /es non- destructive bond pull method 2023 ? ? internal visual method 2017, 2032 internal procedure ? ? temperature cycling method 1010, -55c to 125c ? constant acceleration method 2001, 500g, y1 direction ? burn-in 96 hours at +125c 24 hours at +125c ? ? final electrical 100% at 25c ? ? hermeticity method 1014, fine leak, condition a method 1014, gross leak, condition c dip (1 x 10 -3 ) ? ? ? external visual method 2009 ? ?
dvehf2800t series 1x030dsd 11 ordering information dvehf 28 5 12 t /es - xxx 1 2 3 4 5 6 7 (1) (2) (3) (4) product series nominal input voltage main output voltage auxiliary output voltages dvehf 28 28 volts 5 + 5 volts 12 15 12 volts 15 volts (5) (6) (7) number of outputs screening code 1 additional screening code t triple none /es standard extended contact sales notes: 1. vpt inc. reserves the right to ship higher screened products to meet lower screened orders at our sole discretion unless specifically forbidden by customer contract. please contact your sales representative or the vpt inc. sales department for more information concerning additional environmental screening and testing, different input voltage, output voltage, power requirement, source inspection, and/or special element evaluation for space or other higher quality applications. contact information to request a quotation or place orders please contact your sales representative or the vpt inc. sales department at: phone : (425) 353-3010 fax : (425) 353-4030 e-mail : vptsales@vpt-inc.com all information contained in this datasheet is believed to be accurate, however, no responsibility is assumed for possible erro rs or omissions. the products or specifications cont ained herein are subject to change without notice.

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