www.cd4power.com npx20 series isolated 20w single output dc/dc converters 1 ndc npx20. 3 features ? synchronous recti?er technology ? full 6 amp output current ? remote on/off & output trim ? minimum 76% ef?ciency at 1.8v ? over voltage, current & temperature protection ? operation to zero load ? ul 60950 recognition pending description the npx20 series of dc/dc converters combines ease of application with versatility and is available in three pin patterns based on popular industry standards. selection guide input voltage output voltage output current output power ef?ciency order code v (nom.) v a w (max.) % (min.) npx20s24018m 24 1.8 6.0 10.8 76 npx20s24025m 24 2.5 6.0 15.0 80 npx20s24033m 24 3.3 6.0 19.8 84 npx20s48018m 48 1.8 6.0 10.8 78 NPX20S48025M 48 2.5 6.0 15.0 81 npx20s48033m 48 3.3 6.0 19.8 84 input characteristics parameter conditions min. typ. max. units voltage range continuous operation 24v i/p types 18 24 36 v continuous operation 48v i/p types 36 48 75 under voltage lock out turn on threshold npx20s24xxx 15 17 18 v turn off threshold npx20s24xxx 11 16 16.5 turn on threshold npx20s48xxx 30 32 35 turn off threshold npx20s48xxx 25 32 34.5 input standby current 1.4 ma power consumption zero load 1.0 w re?ected ripple current for measurement method see page 2 40 ma p-p output characteristics parameter conditions min. typ. max. units voltage set point error -2.0 +2.0 %v out overall voltage envelope substrate temperature -40c to +85c -3.0 +3.0 %v out line regulation 2.0 5.0 mv load regulation 20.0 mv ripple & noise bw = 0 to 20mhz with 1f ceramic & 10f tantalum capacitors 100 mv p-p voltage trim range -10.0 +10.0 %v out transient response peak deviation (50-100% & 100-50% swing) 10 %v out settling time (within 1% v out nom ) 600 s start delay f rom remote on/off npx20s24xxx 5.0 m s f rom remote on/off npx20s48xxx 5.0 from application of v in npx20s24xxx 300 from application of v in npx20s48xxx 800 overcurrent protection 110 % i out overvoltage protection 140 %v out g ener al characteristics parameter conditions min. typ. max. units switching frequency 350 khz remote on/off module on (open collector input) module off 0.5 v -1.0 ma mttf mil hdbk 217f 487000 k hrs absolute maximum ratings input voltage, 24v input types 1 40 v input voltage, 48v input types 1 80 v output voltage -0.5v / +5v output trim control -0.5v / +v out remote on/off 0.5 v 1. absolute maximum value for 30 seconds. prolonged operation may damage the product. all speci?cations typical at t a =25c, nominal input voltage and rated output current unless otherwise speci?ed.
www.cd4power.com npx20 series isolated 20w single output dc/dc converters 2 ndc npx20. 3 isolation characteristics parameter conditions min. typ. max. units isolation voltage flash tested for 1 second 1500 v dc resistance v iso = 500 v dc 1 g? capacitance 65 pf environmental characteristics parameter conditions min. typ. max. units substrate temperature full load -40 85 c storage absolute max. internal temperature -40 125 c thermal protection operates at substrate temperature 100 c output voltage adjustment v nom 1.8 2.5 3.3 g 5100 5100 5100 h 2000 2000 2000 l 1.224 1.224 1.224 k 0.576 1.276 2.076 trim up trim down when the output voltage is trimmed up, output current must be derated so that the maximum output power (shown in the selection table) is not exceeded. r d own = ( v out - l) x g - h v nom - v out r u p = g x l - h v out - l - k the trim resistor equations are: where: v in v out gnd trim r up v in v out gnd trim r down npx20s npx20s input reflected ripple current input re?ected ripple current is measured with a 33f low esr (<0.7?) capacitor across the input of the npx dc/dc converter, a 12h ?lter inductor, and a large bulk capacitor 220f <100m ? connected across the power supply. typical input reflected ripple current v in = 24v typical input reflected ripple current v in = 48v all speci?cations typical at t a =25c, nominal input voltage and rated output current unless otherwise speci?ed.
www.cd4power.com npx20 series isolated 20w single output dc/dc converters 3 ndc npx20. 3 characterisitcs curves C npx20s24018m efficiency vs output current output ripple & noise typical transient response thermal derating characterisitcs curves C npx20s24025m efficiency vs output current output ripple & noise typical transient response thermal derating output load change: 50-100% & 100-50% output load change: 100-50% & 50-100%
www.cd4power.com npx20 series isolated 20w single output dc/dc converters 4 ndc npx20. 3 characterisitcs curves C npx20s24033m efficiency vs output current output ripple & noise typical transient response thermal derating characterisitcs curves C npx20s48018m efficiency vs output current output ripple & noise typical transient response thermal derating output load change: 50-100% & 100-50% output load change: 50-100% & 100-50%
www.cd4power.com npx20 series isolated 20w single output dc/dc converters 5 ndc npx20. 3 characterisitcs curves C NPX20S48025M efficiency vs output current output ripple & noise typical transient response thermal derating characterisitcs curves C npx20s48033m efficiency vs output current output ripple & noise typical transient response thermal derating output load change: 50-100% & 100-50% output load change: 50-100% & 100-50%
www.cd4power.com npx20 series isolated 20w single output dc/dc converters 6 ndc npx20. 3 mechanical dimensions surface mount package style (bottom view) pin connections pin function 1 +v out 2 - v out 3 no connection 4 trim 5 no connection 6 no connection 7 no connection 8 on/off 9 - v in 10 + v in through hole package style (bottom view) all pins on a 0.1(2.54) pitch and within 0.01(0.25) of true position. unless otherwise stated all dimensions in inches(mm) 0.01(0.25).
www.cd4power.com npx20 series isolated 20w single output dc/dc converters 7 ndc npx20. 3 c&d technologies (ncl) limited reserve the right to alter or improve the speci?cation, internal design or manufacturing process at any time, without notice. please check with your supplier or visit our web site to ensure that you have the current and complete speci?cation for your product before use. ? c&d technologies (ncl) limited 200 5 no part of this publication may be copied, transmitted or stored in a retrieval system or reproduced in any way including, but not limited to, photography, photocopy, magnetic or other recording means, without prior written permission from c&d technologies (ncl) limited. instructions for use are available from www.cd4power.com c&d technologies (ncl) ltd tanners drive, blakelands north milton keynes mk14 5bu, england tel: +44 (0)1908 615232 fax: +44 (0)1908 617545 email: info@cdtechno-ncl.com c&d technologies, inc. 3400 e britannia drive, tucson, arizona 85706, usa tel: +1 (800) 547-2537 fax: +1 (520) 741-4598 email: pedmktg@cdtechno.com p ackaging specifications tray dimensions
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