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DN79 - ZXSC400 1W LED driver

General Description

ZXSC400 is configured to the reference design below.

The target application is a 1W white LED driven from a two cell NiCd/NiMH or alkaline battery input for flashlights and high powered LED driving.

The supply voltage for ZXSC400 reference design is: VIN = 1.8V ~ 3V.

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DN79 ZXSC400 1W LED driver Neil Wolstenholme, Applications Engineer, Zetex Semiconductors plc Description ZXSC400 is configured to the reference design below. The target application is a 1W white LED driven from a two cell NiCd/NiMH or alkaline battery input for flashlights and high powered LED driving. The supply voltage for ZXSC400 reference design is: VIN = 1.8V ~ 3V. L1 22uH VIN D1 ZHCS1000 C1 100uF/6V3 U1 ZXSC400 VCC VDRIVE STDN ISENSE GND VFB Q1 FMMT617 C2 100uF/6V3 LED1 LXHL-PW01 R1 22mohm R2 0.82ohm GND Figure 1 Schematic diagram Ref. Value Package Part number Manufacturer Contact details Notes U1 N/A SOT23-6 ZXSC400E6 Zetex www.zetex.com Boost converter Q1 N/A SOT23 FMMT617 Zetex www.zetex.com Low sat NPN transistor D1 40V/1A SOT23 ZHCS1000 Zetex www.