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 D1 VIN C1 x8 LEDs C2 VIN LX EN ZXLD1101 C3 FB GND Figure 1 Ref. Value U1 R1 Schematic diagram Part number Manufacturer Comments ZXLD1101E6 Zetex LED Driver in SOT23-6 1A Schottky in SOT23 D1 1A ZHCS1000 Zetex L1 33H Generic Generic R1(1) 0⍀ Generic Generic C1 100F Generic Generic C2 1F Generic Generic C3 10F Generic Generic Table 1 0805 size Bill of materials 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 © Zetex Semiconductors plc 2006 1 www.zetex.com DN72 Typical operating characteristics (For typical application circuit where Tamb = 25°C unless otherwise stated) Figure 2 Performance graphs Europe Americas Asia Pacific Corporate Headquarters Zetex GmbH Streitfeldstraße 19 D-81673 München Germany Zetex Inc 700 Veterans Memorial Highway Hauppauge, NY 11788 USA Zetex (Asia Ltd) 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Zetex Semiconductors plc Zetex Technology Park, Chadderton Oldham, OL9 9LL United Kingdom Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 [email protected] Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 [email protected] Telephone: (852) 26100 611 Fax: (852) 24250 494 [email protected] Telephone: (44) 161 622 4444 Fax: (44) 161 622 4446 [email protected] 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 © Zetex Semiconductors plc 2006