dcdc specification 20 watts ? 72 & 110 vdc input for railway applications ? single and dual outputs ? 1500 vac basic isolation ? high power density ? high efficiency up to 88% ? remote on/off ? 3 year warranty rdc series input input voltage range ? 72 v (36-140 vdc), 110 v (55-176 vdc) input current ? see table input reflected ripple ? 20 ma pk-pk through 12 h inductor input filter ? pi network undervoltage lockout ? 72 v models: on 33.5 v, off 30.5 v typ. 110 v models: on 52.5 v, off 48.5 v typ. input surge ? 72 v models 150 vdc for 100 ms 110 v models 185 vdc for 100 ms output output voltage ? see table output voltage trim ? 10% on single outputs models only minimum load ? no minimum load required line regulation ? 0.2% max load regulation ? single output models: 0.5% max, dual output models: 1% max balanced outputs cross regulation ? 5% (see note 2) setpoint accuracy ? 1% start up time ? 30 ms typical ripple & noise ? 100 mv or 1% pk-pk for single output models, 150 mv or 1% pk-pk for dual output model, whichever is greater, 20 mhz bandwidth (see note 3) transient response ? 4% max deviation, recovery to within 1% in <500 s for a 25% load change temp. coefficient ? 0.02%/c overvoltage protection ? 3.3 v models: 3.9 v typical, 5 v models: 6.2 v typical, 12 v models: 15 v typical 15 v models: 18 v typical, 5 v models: 6.2 v typical, 12 v models: 15 v typical 15 v models: 18 v typical overload protection ? >150% of full load short circuit protection ? trip & restart (hiccup mode), auto recovery overtemperature ? 115 c typical protection remote on/off ? on = logic high (>3.0) or open off = logic low (<1.2 v) or short pin 2 to 3 maximum capacitive ? see table load xppower.com general efficiency ? see table isolation voltage ? 1500 vac input to output 1600 vdc input to case 1600 vdc output to case isolation capacitance ? 2000 pf switching frequency ? 270 khz typical power density ? 25 w/in 3 mtbf ? 400 khrs min to mil-hdbk-217f at 25 c, gb environmental operating temperature ? -40 c to +85 c (see derating curve) case temperature ? +105 c max cooling ? convection-cooled operating humidity ? 5-95% rh, non-condensing storage temperature ? -40 c to +125 c emc general ? complies with en50121-3-2, railway applications - electromagnetic compatibility for rolling stock apparatus emissions ? en55011, 79 dbv (0.15-0.5 mhz) 73 dbv (0.5-30 mhz) esd immunity ? en61000-4-2, level 3, perf criteria a radiated immunity ? en61000-4-3 20 v/m perf criteria a* eft/burst ? en61000-4-4 level 3, perf criteria a* surge ? en61000-4-5 level 2, perf criteria a conducted immunity ? en61000-4-6 10 v/rms, perf criteria a magnetic field ? en61000-4-8 10 a/m, perf criteria a *external input capacitor required 220 f/250 v
03-mar-14 dcdc rdc20 notes 1. input current specified at nominal 72 v or 110 v input. 2. cross regulation for duals is 5% when one output is at 100% and the other is varied between 25% and 100%. 3. measured with 1 f ceramic capacitor in parallel with 10 f electrolytic capacitor across output rails. 4. add suffix -hk for optional heatsink. 6 4 5 2 1 bottom view single & dual output models 3 0.10 (2.54) 0.10 (2.54) dia 0.04 (1.00) dia 0.04 (1.00) 0.10 (2.54) 0.32 (8.00) 0.30 (7.62) 0.30 (7.62) 0.20 (5.08) 0.17 (4.36) 1.73 (43.9) 2.00 (50.8) 0.02 (0.50) 0.24 (6.00) 0.64 (16.3) 0.10 (2.54) 0.40 (10.16) 0.40 (10.16) 0.40 (10.16) optional heatsink mechanical details application notes load (%) ambient temperature (c) -40 0 10 20 30 40 50 60 70 80 90 100 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 without heat-sink with heat-sink derating curve pin connections pin single dual 5 /nx: /nx: a 1nx: 1nx: b it9;@t g:3guu it9;@t g:3guu c /n;a@ /n;a@ d 1n;a@ r;9 e l>x9 1n;a@ typical resistor s3v3 s05 s12 s15 l>x9 s;c: 54& 5d2b y ? ? ? ? ? ? ? ? ? notes external output trim r trim-up r trim-down 6 5 6 4 &a@:.88e @>69921 a?6:4 @56? 92@5;1 ;:@.0@ ?.82? 3;> 12@.68? &: ?6:482 ;a@?6;:? ;:8e models and ratings input voltage output voltage output current input current (1) maximum capacitive load efficiency model number (4) no load full load be15c4 nsr b2b n e244 o a4 9o b5a 9o 54444 ju gg24& isra4fakbnb d24 n c244 o ad 9o b5b 9o eg44 ju gg2d& isra4fak4d 5a24 n 52ed o 5d 9o b5g 9o 5444 ju ge2d& isra4fak5a 5d24 n 52bb o a4 9o b5g 9o f44 ju gf24& isra4fak5d id24 n ia244 o bd 9o b5h 9o i5444 ju gf24& isra4fas4d i5a24 n i42gb o a4 9o bab 9o icf4 ju gd2d& isra4fas5a i5d24 n i42ef o a4 9o bac 9o ibb4 ju ge24& isra4fas5d dd15fe nsr b2b n e244 o 5d 9o a4g 9o 54444 ju ge2d& isra4554kbnb d24 n c244 o a4 9o a4h 9o eg44 ju gf24& isra4554k4d 5a24 n 52ed o 5d 9o a5a 9o 5444 ju gd24& isra4554k5a 5d24 n 52bb o 5d 9o a55 9o f44 ju ge24& isra4554k5d id24 n ia244 o b4 9o a55 9o i5444 ju ge24& isra4554s4d i5a24 n i42gb o 5d 9o a5d 9o icf4 ju gc24& isra4554s5a i5d24 n i42ef o 5d 9o a5d 9o ibb4 ju gd24& isra4554s5d
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