page 1 of 3 issued date 2008/05/21 general specifications efficiency see table isolation voltage 1600vdc, min. isolation resistance 10 9 ohms, min. isolation capacitance 500pf, max. switching frequency 300khz, typ. design meet standard iec60950, ul1950, en60950 potting material epoxy (ul94-v0) dimensions 1.95 x 1.19 x 0.38 inch (49.5 x 30.2 x 9.7 mm) weight 32.5g (1.15oz) mtbf (note 3) 1.632 x 10 6 hrs environmental specifications operating ambient temperature -40oc ~ +85oc (with derating) maximum case temperature +100oc storage temperature range -55oc ~ +105oc thermal impedance nature convection 14oc/watt thermal shock mil-std-810f vibration mil-std-810f relative humidity 5% to 95% rh emc characteristics (note 4) conducted emissions en55022 class a radiated emissions en55022 class a esd en61000-4-2 perf. criteria b radiated immunity en61000-4-3 perf. criteria a fast transient en61000-4-4 perf. criteria b surge en61000-4-5 perf. criteria b conducted immunity en61000-4-6 perf. criteria a output specifications output power 20 watts, max. voltage accuracy full load and nominal vin 1% voltage adjustability 10% minimum load 0% line regulation ll to hl at full load 0.2% load regulation 10% to 100% fl 0.5% ripple and noise 20mhz bandwidth (measured with 0.1uf/50v mlcc) see table temperature coefficient 0.02% / oc, max. transient response recovery time 25% load step change 300us over voltage zener diode clamp 2.0v output 3.3v output 5v output 12v output 15v output 3.9vdc 3.9vdc 6.2vdc 15vdc 18vdc over load protection % of fl at nominal input 150%, max. short circuit protection hiccup, automatics recovery input specifications input voltage range 48v nominal input 36 ? 75vdc input voltage lockout dc-dc on dc-dc off 36vdc 33vdc input filter l-c type input surge voltage 100ms max 48v input 100vdc input reflected ripple nominal vin and full load 25map-p start up time (note 1) nominal vin and constant resistive load power up remote on/off 25ms, typ. 25ms, typ. remote on/off (note 2) remote off input current dc-dc on dc-dc off nominal vin open or 3.5v < vr < 12v short or 0v < vr < 1.2v 2.5ma the sdc20 series offer 20 watts of output power from a 1.95 x 1.19 x 0.38 inch smd type package. the sdc20 series with 2:1 wide input voltage of 36-75vdc and features 1600vdc of isolation, short- circuit and over-volt age protection, as well as six sided shielding. all models are particularly suited to telecommunications, industrial, mobile telecom and test equipment applications. technical specification all specifications are typical at nomi nal input, full load and 25oc otherwise noted ce mark ? 20 watts maximum output power ? 2:1 wide input voltage range ? international safety standard approval ? six-sided continuous shield ? high efficiency up to 88% ? smd type 1.95? x 1.19? x 0.38? package ? fixed switching frequency ?
page 2 of 3 issued date 2008/05/21 model number input range output voltage output current ripple & noise (5) input current (6) eff (7) (%) capacitor (8) load max sdc20-48s2p0 36 ? 75 vdc 2.0 vdc 4000ma 50mv 214ma 82 17000uf SDC20-48S3P3 36 ? 75 vdc 3.3 vdc 4000ma 50mv 344ma 84 10300uf sdc20-48s05 36 ? 75 vdc 5.0 vdc 4000ma 75mv 490ma 89 6800uf sdc20-48s12 36 ? 75 vdc 12.0 vdc 1670ma 75mv 497ma 88 1200uf sdc20-48s15 36 ? 75 vdc 15.0 vdc 1330ma 75mv 495ma 88 750uf note 1 please add an external filter at converter input termi nals when measuring input refl ected ripple, as figure 1. l: simulated source impedance of 12 h c: nippon chemi-con kmf series, 220 f/100v. 2 the on/off control pin voltage is referenced to ?vin 3 bellcore tr-nwt-000332. case i: 50% . stress, temperature at 40oc. (ground fixed and controlled environment) 4 an external filter capacitor is required for emc testing. t he capacitor should be capable of handing 1a ripple current for 48v models. power mate suggest: nippon c hemi-con kmf series, 220 f/100v, esr 90m . 5 test condition: nominal input and full load. 6 maximum value at nominal input voltage and full load. 7 typical value at nominal input voltage and full load. 8 test by minimum vin and constant resistive load. dip pin connection pin 1 2 3 4 5 6 define + output - output nc trim nc nc define + input - input nc sync on-off ctrl nc pin 12 11 10 9 8 7 50 60 70 80 90 100 -40 -25 0 -10 25 50 75 100 0 a mbient temperature (oc) output power (%) sdc20-48s05 derating curve nature convection 1 12 0.787(20.0) 0.55(14.0) 0.80(20.3) 1.20(30.5) 1.60(40.6) 1.81(46.0) 0.13(3.3) 1.45(36.8) 0.11(2.8) 0.063(1.6) dip hole required for guide 2 p lace. 1 12 7 6 top view 1.95(49.5) 1.19(30.2) 0.382 (9.7) 0.068(1.75) 1.88(47.8) 0.06(1.52) 0.01(0.25) 0.07(1.8) 1.72(43.8) 1.52(38.7) 1.32(33.6) 0.12(3.2) 0.32(8.2) 0.52(13.3) bottom view 0.47 (12.1) 1.39(35.3) dia 0.05(1.27) x 2 0.10(2.54) 1. all dimensions in inches (mm) tolerance: x.xx 0.02 (x.x 0.5) 2. pin pitch tolerance 0.014(0.35)
page 3 of 3 issued date 2008/05/21 a pp li ca ti on o f s y nc h ron i za ti on 1. the unit is capable of external synchronization from an independent time base with a switching rate between 330khz and 360khz 2. the amplitude of the sync hronizing pulse train is ttl compatible 3. the duty cycle of the clk should be 20% high and 80% low 4. synchronization is referenced to negative input (-vin) ctr + - 3 2 1 converter on/off control + vin - vin on/off control applicati sync + - 3 2 4 converter + vin - vin + - 3 2 4 converter clk 20% 80% clk signal 2n7000 sync
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