features n maxim compatible n bs en 60950 approved n isolation to 6kv n t oroidal construction n industry standard pinout n ul 94v-0 package material n fully encapsulated description the 76250en converter transformer is specifically designed for use with maxim chipsets to provide isolated rs232 interfaces. a carefully controlled turns ratio ensures consistent performance whilst a toroidal construction minimises emi. the 76253/xxen converter transformers are specifically designed for use with the max253 chipset to provide isolated power supplies. the 5v version can supply 1w and the 3.3v version can supply 500mw . a centre tapped secondary winding allows for full bridge, half bride or voltage doubling. the devices are fully approved to bs en 60950 for use in telecoms applications. 76250en characteristics parameter conditions min typ max units primary inductance, l p 10khz, 100mv 1.0 2.0 2.5 mh leakage inductance, l l 100khz, 100mv 35 40 ? interwinding capacitance, c ww 100khz, 100mv 5.0 10 pf d.c. resistance, r dc <0.1vdc 1.0 2.0 w v olt-time product, e t 5khz, 5v 50 v? 76253/35en characteristics parameter conditions min typ max units primary inductance, l p 100khz, 250mv 53 92 120 ? secondary inductance, l s 100khz, 250mv 350 460 600 ? leakage inductance, l l 100khz, 250mv 1.5 3.6 ? interwinding capacitance, c ww 100khz, 250mv 1.80 3.00 pf d.c. resistance, r dc >0.1vdc 0.60 1.00 w v olt-time product, e t 5khz, 5v 20 35 v? 76253/55en characteristics parameter conditions min typ max units primary inductance, l p 100khz, 250mv 120 205 250 ? secondary inductance, l s 100khz, 250mv 280 362 445 ? leakage inductance, l l 100khz, 250mv 3.90 5.00 ? interwinding capacitance, c ww 100khz, 250mv 1.20 3.00 pf d.c. resistance, r dc >0.1vdc 0.90 1.50 w v olt-time product, e t 5khz, 5v 20 23 v? absolute maximum ratings all specifications typical at t a = 2 5 ?c . selection guide input output output isolation t urns v oltage v oltage cur r ent v oltage ratio order code (v) (v) (ma max) (vdc) 76250en 6000 1ct:1 76253/35en 3.3 5.0 100 6000 1: ? 5 76253/55en 5.0 5.0 200 6000 1:1.33 operating free air temperature range 76250en 0? to 70? operating free air temperature range 76253/xxen ?0? to 85? storage temperature range ?0? to 125? lead temperature 1.5mm from case for 10 seconds 300? peak cur r ent i pk 76250en 300ma peak cur r ent i pk 76253/xxen 400ma isolation voltage (flash tested for 1 second) 6000vdc 76250en, 76253/xxen en approved converter transformers www.dc-dc.com
76250en, 76253/xxen en approved converter transformers c&d technologies (ncl) ltd t anners drive, blakelands north milton keynes mk14 5bu, england t el: +44 (0)1908 615232 fax:+44 (0)1908 617545 email: info@cdtechno-ncl.com www: http://www.dc-dc.com c&d technologies (ncl), inc. 8917 glenwood avenue, raleigh nc 27612, usa t el: +1 (919) 571-9405 fax: +1 (919) 571-9262 email: info@us.cdtechno-ncl.com c&d technologies (ncl) limited reserve the right to alter or improve the specification, 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 cur r ent and complete specification for your product before use. ?c&d technologies (ncl) limited 2000 nmp 7625xen.2 no part of this publication may be copied, transmitted or stored in a r etrieval 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.dc-dc.com 0 20 40 60 80 100 output cur r ent (ma) fs=high fs=low 76253/35en efficiency curves 0 100 200 300 400 output cur r ent (ma) fs=high fs=low 76253/55en 100 80 60 40 20 0 -50 -25 0 25 50 75 100 t emperature (?) fs=high fs=low 76253/35en vol t age deviation 1 1 0 105 100 9 5 9 0 -50 -25 0 25 50 75 100 t emperature (?) fs=high fs=low 76253/55en 1 1 0 105 100 9 5 9 0 mechanical dimensions typical characteristics * 76250en pin not fitted. all dimensions in mm xx.xx ?.25mm. all pins on a 2.54mm pitch and within ?.25mm of true position. 76250en yyww 15.00 15.00 1 3 5 2 4* 6 12.50 4.10 12.00 2.54 7.50 0.56??.05 0 20 40 60 80 100 output cur r ent (ma) fs=high fs=low 76253/35en vol t age curves 10 8 6 4 2 0 0 100 200 300 400 output cur r ent (ma) fs=low/high 76253/55en 10 8 6 4 2 0 10.16 2.42 primar y pin connections 76250en (top view) 1 3 5 2 6 secondar y primar y pin connections 76253/xxen (top view) 1 3 5 2 4 6 secondar y 100 80 60 40 20 0
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