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| 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. D1 VIN U1 Vcc L1 Q1 Vdrive C1 Stdn Isense Gnd C2 C3 ZXSC310 R1 Figure 1 Reference Value U1 Q1 D1 L1 R1 C1 C2 C3 2A 7.5 H 19.5m 1F 220 F 100 F Part number ZXSC310E5 FMMT617 ZHCS2000 Schematic diagram Comments LED driver in SOT23-5 Low sat. NPN in SOT23 2A Schottky in SOT23 Manufacturer Contact details Zetex Zetex Zetex www.zetex.com www.zetex.com www.zetex.com DO3316P-153x2 Coilcraft Generic Generic Generic Generic Generic Generic Generic Generic Table 1 www.coilcraft.com ISAT = 3A NA NA NA NA 0805 size Bill of materials Issue 2 - July 2006 (c) Zetex Semiconductors plc 2006 1 www.zetex.com DN68 Figure 2 Performance graphs Europe Zetex GmbH Streitfeldstrae 19 D-81673 Munchen 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 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 which (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 specification, design, price or conditions of supply of any product or service. www.zetex.com 2 Issue 2 - July 2006 (c) Zetex Semiconductors plc 2006 |
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