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| DN72 ZXLD1101 Driving 8 series LEDs Description This design note shows the ZXLD1101 driving 8 series connected LEDs. The input voltage ranges from 4.2V to 5.2V with a maximum output current of 24mA at 5V input. A typical schematic diagram is shown in Figure 1. L1 VIN D1 C1 VIN LX x8 LEDs C3 FB C2 EN ZXLD1101 GND R1 Figure 1 Ref. U1 D1 L1 R1(1) C1 C2 C3 1A 33 H 0 100 F 1F 10 F Value Part number ZXLD1101E6 ZHCS1000 Generic Generic Generic Generic Generic Table 1 Schematic diagram Manufacturer Zetex Zetex Generic Generic Generic Generic Generic Bill of materials 0805 size Comments LED Driver in SOT23-6 1A Schottky in SOT23 NOTES: (1) R1 is set to zero. It shows the maximum output power characteristic of the LED driver. A regulated LED current below the maximum value can be set by: ILED = VFB/R1, where VFB = 0.1V. Issue 2 - July 2006 (c) Zetex Semiconductors plc 2006 1 www.zetex.com DN72 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 2 - July 2006 (c) Zetex Semiconductors plc 2006 |
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