DN76 ZXLD1100 and ZXLD1101 driving from 3 to 6 LEDs Description This design note shows the ZXLD1100 and ZXLD1101 driving series connected LEDs. The input voltage range is 2.5V to 5.5V. The same circuit can be used for up to 6 LEDs. The ZXLD1100 contains onchip open circuit LED protection. This function would require an additional Zener and resistor with the ZXLD1101. Note: LED current is set to 15mA Figure 1 Ref. Value Package Part number Schematic diagrams Manufacturer Contact details Notes U1 TSOT23-5 ZXLD1101ET5 Zetex www.zetex.com LED driver IC U1 SC706 ZXLD1100H6 Zetex www.zetex.com LED driver IC Zetex www.zetex.com 400mA Schottky diode D1 400mA SOD323 ZHCS400 L1 10H CMD4D11-100MC Sumida R1 6.8⍀ 0603 Generic Generic R21 100k⍀ 0603 Generic Generic C1 1F 0603 Generic Generic C2 1F 0603 Generic Generic NSCW215 Nichia LEDs Table 1 Issue 2 - July 2006 © Zetex Semiconductors plc 2006 www.sumida.com 1mm height profile www.nichia.com 6pcs per board Bill of materials 1 www.zetex.com DN76 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