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wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 1 of 13 datasheet rev. a DH40 series 2:1 wide input voltage ranges single & dual outputs, efficiency up to 92% 2.0? x 1.0? x 0.4? encapsulat ed shielded metal package 40 watt dc/dc power converters features ? rohs compliant ? 40 watts output power ? 2:1 wide input voltage ranges ? single & dual outputs ? remote on/off control ? 1500vdc i/o isolation ? high efficiency up to 92% ? under voltage lockout (uvlo) ? 2.0? x 1.0? x 0.4? package size ? trimmable output voltage ? shielded metal case with isolated base-plate ? -40c to +80c operating temperature range ? over load, short circuit, over voltage, and over temperature protection ? ul/iec/en 60950-1 safety approvals (pending) ? heatsink (optional) description the DH40 series is the latest ge neration of high performance dc/dc converters setting a new standar d concerning power density. these converters offer 40 wa tts of continuous output power in a 2.0? x 1.0? x 0.4? encapsulated, shielded metal package. the DH40 series has single and dual output mode ls with 2:1 wide input voltage ranges of 9-18vdc, 18-36vdc, and 36-75vdc. advanced circuit topology provides a very high efficiency up to 92% and an operating temperature range of -40c to +80c. further features include remote on/off, trimmable output voltage, under-voltage lockout as well as over load, over voltage, short circuit, and over- temperature protection. these converters are rohs compliant and are ideal for use in b attery operated equipment, instrumentation, distributed power arch itectures in communication and industria l electronics and many other space critical applications.
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 2 of 13 specifications: DH40 series all specifications are based on 25c, nominal input volta ge, and maximum output curre nt unless otherwise noted. we reserve the right to change specifi cations based on technological advances. specification test conditions min typ max unit input specifications 12vdc nominal input models 9 12 18 24vdc nominal input models 18 24 36 input voltage range 48vdc nominal input models 36 48 75 vdc 12vdc nominal input models -0.7 25 24vdc nominal input models -0.7 50 input surge voltage (1s max.) 48vdc nominal input models -0.7 100 vdc 12vdc nominal input models 9 24vdc nominal input models 18 start-up threshold voltage 48vdc nominal input models 36 vdc 12vdc nominal input models 8.3 24vdc nominal input models 16.5 under voltage lockout (uvlo) 48vdc nominal input models 33 vdc power up 30 start-up time remote on/off nominal vin and constant resistive load 30 ms input current see table reflected ripple current (page 11) see table internal filter for en55022 class a compliance see page 3 lc filter 12vdc nominal input models 8000ma slow-blow type 24vdc nominal input models 4000ma slow-blow type input fuse (note 3) 48vdc nominal input models 2000ma slow-blow type short circuit current hiccup mode 1.5hz typ. output specifications output voltage see table output voltage balance dual output models, balanced loads 2.0 % line regulation low line to hi gh line at full load 0.5 % single output models 0.5 load regulation dual output models minimum load to full load 1.0 % load cross regulation (dual output models ) asymmetrical load 25% / 100% full load 5.0 % output voltage setting accuracy at 50% load and nominal vin 1.0 %vnom output voltage trim (page 10) % of nominal output voltage 10 % output power see table output current see table single output models no minimum load required minimum load dual output models see table 3.3 & 5vdc output models 100 12, 15, & 24vdc output models 150 ripple & noise (0-20mhz) (page 12) measured with a 1f m/c and a 10f t/c in parallel dual output models 150 mvp-p transient recovery time (note 2) 25% load step change 250 s temperature coefficient 0.02 %/c protection input polarity protection none over voltage protection (page 11) see table over load protection current limitation at 150% typ. of io max., hiccup thermal protection shutdown temperature 110 c short circuit protection hiccup, automatic recovery remote on/off (page 11) converter on 3.5~12v or open circuit positive logic converter off 0v ~ 1.2 or short circuit on vctrl = 5.0v 0.5 control input current off vctrl = 0v -0.5 ma control common referenced to negative input stand-by input current nominal vin 2.5 ma
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 3 of 13 specifications: DH40 series all specifications are based on 25c, nominal input volta ge, and maximum output curre nt unless otherwise noted. we reserve the right to change specifi cations based on technological advances. specification test conditions min typ max unit general efficiency (see efficiency curves on pages 6~8) see table switching frequency 320 khz isolation voltage (input to output) 60 seconds 1500 vdc isolation resistance 500vdc 1000 m ? isolation capacitance 100khz, 1v 1500 pf maximum capacitive load see table environmental specifications 3.3vdc output models -40 +66 5, 12, & 15vdc output models -40 +46 operating temperature (w/o heatsink) (see derating curves on page 5) natural air convection (20lfm) nominal vin and full load dual output models -40 +40 c 3.3vdc output models -40 +73 5, 12, & 15vdc output models -40 +57 operating temperature (w/ heatsink) (see derating curves on page 5) natural air convection (20lfm) nominal vin and full load dual output models -40 +52 c natural convection (20lfm) 12.0 100lfm convection 9.0 200lfm convection 8.0 thermal impedance (w/o heatsink) 400lfm convection 6.0 c/w natural convection (20lfm) 10.0 100lfm convection 5.4 200lfm convection 4.5 thermal impedance (w/ heatsink) 400lfm convection 3.0 c/w case temperature +105 c storage temperature -50 +125 c humidity (non-condensing) 95 % rh rfi six-sided shielded metal case cooling natural convection is about 20lfm a nd is not still air (0lfm) natural convection lead temperature 1.5mm from case for 10 seconds 260 c mtbf (calculated) mil-hdbk-217f at 25c, ground benign 328,000 hours physical specifications weight 1.06oz (30g) dimensions (l x w x h) 2.0 x 1.0 x 0.43 inches (50.8 x 25.4 x 11 mm) case material aluminum alloy, black anodized coating base material fr4 pcb (flammability to ul 94v-0 rated) potting material epoxy (ul94-v0) pin material copper alloy with gold plat e over nickel underplate heatsink (optional) see page 9 safety safety approvals (pending) ul/c ul 60950-1 recognition (csa certifi cate), iec/en 60950- 1 (cb-scheme) emi-filter to meet en55022, cl ass a; fcc part 15, level a conducted and radiated emissions en55022 class a c3 c2 DH40 module single output c1 -input +input -output +output DH40 module dual output -input +input c1 c3 c2 -output common +output part no dh12sxx-40 dh24sxx-40 dh48sxx-40 part no dh12dxx-40 dh24dxx-40 dh48dxx-40 c1 10f/25v 1812 mlcc 4.7f/50v 1812 mlcc 2.2f/100v 1812 mlcc c1 10f/25v 1812 ml cc 4.7f/50v 1812 mlcc 2.2f/100v 1812 mlcc c2, c3 1000pf/2kv 1808 mlcc 1000pf/2kv 1808 mlcc 1000pf/2kv 1808 mlcc c2, c4 1000pf/2kv 1808 mlcc 1000pf/2kv 1808 mlcc 1000pf/2kv 1808 mlcc
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 4 of 13 model selection table single output models output current input current model number input voltage output voltage min max no load max load reflected ripple current (typ) over voltage protection output power efficiency maximum capacitive load dh12s3.3-26 3.3 vdc 0ma 8a 120ma 2.47a 3.9 vdc 26.4w 89% 21000f dh12s5-40 5 vdc 0ma 8a 160ma 3.75a 6.2 vdc 40w 89% 13600f dh12s12-40 12 vdc 0ma 3.33a 160ma 3.75a 15 vdc 40w 89% 2400f dh12s15-40 15 vdc 0ma 2.67a 150ma 3.7a 18 vdc 40w 90% 1500f dh12s24-40 12 vdc (9 ? 18 vdc) 24 vdc 0ma 1.67a 160ma 3.79a 50ma 30 vdc 40w 88% 600f dh24s3.3-26 3.3 vdc 0ma 8a 75ma 1.22a 3.9 vdc 26.4w 90% 21000f dh24s5-40 5 vdc 0ma 8a 80ma 1.83a 6.2 vdc 40w 91% 13600f dh24s12-40 12 vdc 0ma 3.33a 85ma 1.83a 15 vdc 40w 91% 2400f dh24s15-40 15 vdc 0ma 2.67a 75ma 1.83a 18 vdc 40w 91% 1500f dh24s24-40 24 vdc (18 ? 36 vdc) 24 vdc 0ma 1.67a 85ma 1.85a 30ma 30 vdc 40w 90% 600f dh48s3.3-26 3.3 vdc 0ma 8a 40ma 610ma 3.9 vdc 26.4w 90% 21000f dh48s5-40 5 vdc 0ma 8a 50ma 920ma 6.2 vdc 40w 91% 13600f dh48s12-40 12 vdc 0ma 3.33a 50ma 910ma 15 vdc 40w 92% 2400f dh48s15-40 15 vdc 0ma 2.67a 50ma 910ma 18 vdc 40w 92% 1500f dh48s24-40 48 vdc (36 ? 75 vdc) 24 vdc 0ma 1.67a 50ma 920ma 20ma 30 vdc 40w 90% 600f dual output models output current input current model number input voltage output voltage min max no load max load reflected ripple current (typ) over voltage protection output power efficiency maximum (1) capacitive load dh12d12-40 12 vdc 145ma 1.67a 70ma 3.79a 15 vdc 40w 88% 1200f * dh12d15-40 12 vdc (9 ? 18 vdc) 15 vdc 110ma 1.33a 60ma 3.79a 50ma 18 vdc 40w 88% 750f * dh24d12-40 12 vdc 145ma 1.67a 50ma 1.87a 15 vdc 40w 89% 1200f * dh24d15-40 24 vdc (18 ? 36 vdc) 15 vdc 110ma 1.33a 45ma 1.87a 30ma 18 vdc 40w 89% 750f * dh48d12-40 12 vdc 145ma 1.67a 65ma 940ma 15 vdc 40w 89% 1200f * dh48d15-40 48 vdc (36 ? 75 vdc) 15 vdc 110ma 1.33a 65ma 940ma 20ma 18 vdc 40w 89% 750f * notes 1. ? * ? for each output 2. transient recovery time is measured to within 1% error band for a step change in output load from 75% to 100%. 3. all dc/dc converters shoul d be externally fused at th e front end for protection. 4. to order the converter with a heatsink, please add the suffix ?hs? to the model number. (ex: dh12s12-40hs) 5. to order the converter without remote on/off control, please add the suffix ?n ? to the model number. (ex: dh12s12-40n)
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 5 of 13 power derating curves dhxxs3.3-26 derating curve without heatsink dhxxs3.3-26 derating curve with heatsink ~ natural convection 20lfm 100lfm 200lfm 400lfm 100 80 60 40 20 0 -40 0 20 40 60 80 100 110 ambient temperature (c) output power (%) natural convection 20lfm 100lfm 200lfm 400lfm ~ 100 80 60 40 20 0 -40 0 20 40 60 80 100 110 ambient temperature (c) output power (%) dhxxs5-40, dhxxs12-40, dhxxs15-40 derating curve without heatsink dhxxs5-40, dhxxs12-40, dhxxs15-40 derating curve with heatsink ~ natural convection 20lfm 100lfm 200lfm 400lfm 100 80 60 40 20 0 -40 0 20 40 60 80 100 110 ambient temperature (c) output power (%) natural convection 20lfm 100lfm 200lfm 400lfm ~ 100 80 60 40 20 0 -40 0 20 40 60 80 100 110 ambient temperature (c) output power (%) dhxxdxx-40 derating curve without heatsink dhxxdxx-40 derating curve with heatsink ~ natural convection 20lfm 100lfm 200lfm 400lfm 100 80 60 40 20 0 -40 0 20 40 60 80 100 110 ambient temperature (c) output power (%) natural convection 20lfm 100lfm 200lfm 400lfm ~ 100 80 60 40 20 0 -40 0 20 40 60 80 100 110 ambient temperature (c) output power (%)
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 6 of 13 efficiency curves @ 25c (12vdc input models) dh12s3.3-26 efficiency vs load current dh12s5-40 efficiency vs load current 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency (%) 9v 12v 18v 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency (%) 9v 12v 18v dh12s12-40 efficiency vs load current dh12s15-40 efficiency vs load current 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency (%) 9v 12v 18v 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency (%) 9v 12v 18v dh12d12-40 efficiency vs load current dh12d15-40 efficiency vs load current 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency (%) 9v 12v 18v 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency (%) 9v 12v 18v
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 7 of 13 efficiency curves @ 25c (24vdc input models) dh24s3.3-26 efficiency vs load current dh24s5-40 efficiency vs load current 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 18v 24v 36v 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 18v 24v 36v dh24s12-40 efficiency vs load current dh24s15-40 efficiency vs load current 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 18v 24v 36v 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 18v 24v 36v dh24d12-40 efficiency vs load current dh24d15-40 efficiency vs load current 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 18v 24v 36v 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 18v 24v 36v
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 8 of 13 efficiency curves @ 25c (48vdc input models) dh48s3.3-26 efficiency vs load current dh48s5-40 efficiency vs load current 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 36v 48v 75v 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 36v 48v 75v dh48s12-40 efficiency vs load current dh48s15-40 efficiency vs load current 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 36v 48v 75v 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 36v 48v 75v dh48d12-40 efficiency vs load current dh48d15-40 efficiency vs load current 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 36v 48v 75v 0 10 20 30 40 50 60 70 80 90 100 10 20 30 40 50 60 70 80 90 100 % of full load efficiency(%) 36v 48v 75v
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 9 of 13 mechanical drawing tolerance: x.xx0.01 (x.x0.25) x.xxx0.005 (x.xx0.13) pin diameter: ?0.040.002 (?1.00.05) physical characteristics case size: 2.0 x 1.0 x 0.43 inches (50.8 x 25.4 x 11 mm) case material: aluminum alloy, black anodized coating base material: fr4 pcb (flammability to ul 94v-0 rated) pin material: copper alloy with gold plate over nickel underplate potting material: epoxy (ul94-v0) weight: 1.06oz (30g) physical characteristics heatsink material: aluminum finish: black anodized coating weight: 0.3oz (9g) advantages of adding a heatsink 1. to help heat dissipation and increase the stability and reliability of dc/dc converters at high operating temperature atmosphere. 2. to upgrade the operating temperature of dc/dc converters, please refer to derating curves. heatsink option (?hs? suffix) bottom view 6 54 1 2 3 heatsink thermal pad clamp converter unit: inches (mm) 0.40 (10.16) 0.20 (5.08) 0.14 (3.6) 0.04 (1.1) 0.40 (10.16) 0.40 (10.16) 1.00 (25.4) 0.10 (2.54) 2.00 (50.8) 1.80 (45.72) 0.43 (11.0) 0.22 (5.5) ?0.04 (?1.00) unit: inches (mm) 1.22 (31.0) max 0.71 (18.0) max 1.22 (31.1) 0.20 (5.08) 0.91 (23.2) 1.55 (39.4) 0.96 (24.5) 0.49 (12.41) pin connections pin single output dual output 1 +vin +vin 2 -vin -vin 3 remote on/off remote on/off 4 +vout +vout 5 -vout common 6 trim -vout
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 10 of 13 external output trim output can be externally trimme d by using the method shown below DH40 module bottom view 6 54 1 2 3 DH40 module bottom view 6 54 1 2 3 r up r down trim up trip down dhxxs3.3-26 trim table dhxxs5-40 trim table trim trim up r up trim down r down trim trim up r up trim down r down 1% 3.333v 70.50k ? 3.267v 63.59k ? 1% 5.050v 36.57k ? 4.950v 45.53k ? 2% 3.366v 29.28k ? 3.234v 30.28k ? 2% 5.100v 16.58k ? 4.900v 20.61k ? 3% 3.399v 16.87k ? 3.201v 18.19k ? 3% 5.150v 9.92k ? 4.850v 12.31k ? 4% 3.432v 10.90k ? 3.168v 11.95k ? 4% 5.200v 6.59k ? 4.800v 8.15k ? 5% 3.465v 7.38k ? 3.135v 8.13k ? 5% 5.250v 4.59k ? 4.750v 5.66k ? 6% 3.498v 5.06k ? 3.102v 5.56k ? 6% 5.300v 3.25k ? 4.700v 4.00k ? 7% 3.531v 3.42k ? 3.069v 3.70k ? 7% 5.350v 2.30k ? 4.650v 2.81k ? 8% 3.564v 2.20k ? 3.036v 2.31k ? 8% 5.400v 1.59k ? 4.600v 1.92k ? 9% 3.597v 1.25k ? 3.003v 1.21k ? 9% 5.450v 1.03k ? 4.550v 1.23k ? 10% 3.630v 0.49k ? 2.970v 0.34k ? 10% 5.500v 0.59k ? 4.500v 0.68k ? dhxxs12-40 trim table dhxxs15-40 trim table trim trim up r up trim down r down trim trim up r up trim down r down 1% 12.120v 368.92k ? 11.880v 394.50k ? 1% 15.150v 392.98k ? 14.850v 572.67k ? 2% 12.240v 161.92k ? 11.760v 179.74k ? 2% 15.300v 182.12k ? 14.700v 248.63k ? 3% 12.360v 94.97k ? 11.640v 106.08k ? 3% 15.450v 108.73k ? 14.550v 145.60k ? 4% 12.480v 61.86k ? 11.520v 68.86k ? 4% 15.600v 71.43k ? 14.400v 94.97k ? 5% 12.600v 42.12k ? 11.400v 46.39k ? 5% 15.750v 48.85k ? 14.250v 64.87k ? 6% 12.720v 29.00k ? 11.280v 31.36k ? 6% 15.900v 33.71k ? 14.100v 44.92k ? 7% 12.840v 19.66k ? 11.160v 20.60k ? 7% 16.050v 22.86k ? 13.950v 30.72k ? 8% 12.960v 12.66k ? 11.040v 12.51k ? 8% 16.200v 14.69k ? 13.800v 20.10k ? 9% 13.080v 7.23k ? 10.920v 6.21k ? 9% 16.350v 8.33k ? 13.650v 11.86k ? 10% 13.200v 2.89k ? 10.800v 1.17k ? 10% 16.500v 3.23k ? 13.500v 5.28k ?
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 11 of 13 test configurations input reflected-rippl e current test setup input reflected-ripple curre nt is measured with an inductor li n (4.7h) and cin (220f, esr < 1.0 ? at 100 khz) to simulate source impedance. capacitor cin offsets possible battery impedance. current ripple is measured at th e input terminals of the module. measurement bandwidth is 0-500 khz. +out -out +vin -vin dc/dc converter load battery + lin + cin to oscilloscope current probe peak-to-peak output noise measurement test use a 1f ceramic capacitor and a 10f tantalum capacito r. scope measurement should be made by using a bnc socket, measurement bandwidth is 0-20mhz. position the load between 50mm and 75mm from the dc/dc converter. +out -out +vin -vin resistive load scope copper strip cout copper strip +out -out +vin -vin resistive load scope copper strip cout com. scope cout copper strip copper strip single output dc/dc converter dual output dc/dc converter design & feature considerations remote on/off positive logic remote on/off turns the module on during a l ogic high voltage on the remote on/off pin and off during a logic low. to turn the module on and off, the user must supply a switch to control the voltage between the on/off terminal and the ?vin terminal. the switch can be an ope n collector or equivalent. a logic low is 0v to 1.2v. a logic high is 3.5v to 12v. the maximu m sink current at on/off terminal (p in 3) during a logic low is -100a over current protection to provide protection in a fault (out put overload) condition, the unit is e quipped with internal current limiting circuitry and can endure overl oad for an unlimited duration. over voltage protection the output over voltage clamp consists of control circuitry which is independent of the primary regulation loop that monitors the voltage on the output termin als. the control loop of the clamp ha s a higher voltage se t point than the primary loop. this provides a redundant voltage control that reduces the risk of output over voltage. the ovp level can be found in the model selection table.
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 12 of 13 input source impedance the power module should be connected to a low ac-impeda nce input source. highly inductive source impedances can affect the stability of the power module. in applications where power is supplied over long lines a nd output loading is high, it may be necessary to use a capacitor at the input to ensure startup. capacitor mounted close to the power module helps ensure stability of the unit, it is recommended to use a good quality low equivalent se ries resistance (esr < 1.0 ? at 100 khz) capacitor of 33 f for the 12v input devices and a 10f for the 24v and 48v devices. + +out -out +vin -vin dc/dc converter load dc power source + - cin output ripple reduction a good quality low esr capacitor placed as close as possible across the load will give the best ripple and noise performance. to reduce output ripple, it is re commended to use 4.7f capacitors at the output. +out -out +vin -vin load dc power source + - cout +out -out +vin -vin load dc power source + - cout com. load cout single output dc/dc converter dual output dc/dc converter maximum capacitive load the DH40 series has a limitation of maximum connected capacitance on the output. the power module may be operated in current limiting mode du ring start-up, affecting the ramp-up and the start-up time. the maximum capacitance can be found in th e model selection table. thermal considerations many conditions affect the thermal performance of the power module, such as orientation, airflow over the module, and board spacing. to avoid exceeding the maximum temper ature rating of the components inside the power module, the case temperature must be kept below 105c. the derating curves are determined from measurements obtained in a test setup. dut position of air velocity probe and thermocouple 50mm / 2in air flow 15mm / 0.6in company information
rev. a DH40 series single & dual outputs 2:1 wide input ranges 40 watt dc/dc power converters wall industries, inc. 5 watson brook road exeter, nh 03833 10/31/2012 603-778-2300 www.wallindustries.com fax 603-778-9797 page 13 of 13 wall industries, inc. has created custom and modified units for over 50 years. our in-house research and development engineers will provide a solution that exceeds your perfo rmance requirements on-time and on budget. our iso9001-2008 certification is just one example of our commitment to produc ing a high quality, well-documented product for our customers. our past projects demonstrate our commitment to you, our cu stomer. wall industries, inc. has a reputation for working closely with its customers to ensure each solution meets or exceeds form, fit and f unction requirements. we will continue to provide ongoing support for your project a bove and beyond the design and production phases. give us a call today to discuss your future projects. contact wall industries for further information: phone : ? (603)778-2300 toll free : ? (888)587-9255 fax : ? (603)778-9797 e-mail : sales@wallindustries.com web : www.wallindustries.com address : 5 watson brook rd. exeter, nh 03833

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