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| DN71 ZXSC400 Solution for Luxeon(R) V Star high powered LED Description This design note shows the ZXSC400 driving a Luxeon(R) V Star LED. The input voltage ranges from 4.2V to 5.4 V with a maximum output current of 790mA at 5V input. A typical schematic diagram is shown in Figure 1. VIN=4.2V to 5.4V L1 D1 Q1 C2 U1 Vcc Stdn Vdrive Isense VFB C1 Gnd ZXSC400 R1 R2 Figure 1 # Schematic diagram Manufacturer Zetex Zetex Zetex Generic Generic Generic Generic Generic Comments LED driver in SOT23-6 Low sat NPN in SOT23 2A Schottky in SOT23 ISAT = 3A 0805 size 0805 size Ref. U1 Q1 D1 L1 R1 R2 C1 C2 Value Part number ZXSC400E6 FZT1049 2A 22mH 22mV 350mV 220mF 450mF ZHCS2000 Generic Generic Generic Generic Generic Table 1 Bill of materials Issue 5 - July 2006 (c) Zetex Semiconductors plc 2006 1 www.zetex.com DN71 Typical operating characteristics (For typical application circuit where Tamb = 25C unless otherwise stated) 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 5 - July 2006 (c) Zetex Semiconductors plc 2006 |
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