issue 2 - july 2006 1 www.zetex.com ? zetex semiconductors plc 2006 DN68 zxsc310 high power torch reference design description this design note shows a typical zxsc310 led driver circuit for a high powered led torch. the input voltage ranges from 0.7v to 1.6v with a maximum output current of 335ma at 1.4v input. a typical schematic diagram is shown in figure 1. figure 1 schematic diagram reference value part number manufacturer contact details comments u1 zxsc310e5 zetex www.zetex.com led driver in sot23-5 q1 fmmt617 zetex www.zetex.com low sat. npn in sot23 d1 2a zhcs2000 zetex www.zetex.com 2a schottky in sot23 l1 7.5 h do3316p-153x2 coilcraft www.coilcraft.com i sat = 3a r1 19.5m generic generic na 0805 size c1 1 fgeneric generic na c2 220 fgeneric generic na c3 100 fgeneric generic na table 1 bill of materials q1 l1 v in vcc gnd isense vdrive stdn u1 zxsc310 d1 c2 r1 c3 c1
DN68 www.zetex.com 2 issue 2 - july 2006 ? zetex semiconductors plc 2006 for international sales offices visit www.zetex.com/offices zetex products are distributed worldwide. for details, see www.zetex.com/salesnetwork this publication is issued to provide outline information only whic h (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contact or be regarded as a representation relating to the products or services concerned. the company reserves the right to alter without notice the specif ication, design, price or conditions of supply of any product or service. europe zetex gmbh streitfeldstra?e 19 d-81673 mnchen germany telefon: (49) 89 45 49 49 0 fax: (49) 89 45 49 49 49 europe.sales@zetex.com americas zetex inc 700 veterans memorial highway hauppauge, ny 11788 usa telephone: (1) 631 360 2222 fax: (1) 631 360 8222 usa.sales@zetex.com asia pacific zetex (asia ltd) 3701-04 metroplaza tower 1 hing fong road, kwai fong hong kong telephone: (852) 26100 611 fax: (852) 24250 494 asia.sales@zetex.com corporate headquarters zetex semiconductors plc zetex technology park, chadderton oldham, ol9 9ll united kingdom telephone: (44) 161 622 4444 fax: (44) 161 622 4446 hq@zetex.com figure 2 performance graphs
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