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DN85 - ZXSC400 1W/3W buck LED drivers

General Description

In Figure 1, ZXSC400 is configured as a high efficiency buck LED driver.

The target applications are either 1W (350mA) or 3W (700mA) drivers for white LED driven from a 4 cell battery, or a 2 alkaline cell input for flashlights.

The supply voltage for ZXSC400 reference design is: VIN = 3.8V to 6V.

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Other Datasheets by Zetex (now Diodes Incorporated)

Part Number Description
DN84 ZXSC400 Driving 3W high power LEDs
DN86 Reduced component count and compact reference design

Full PDF Text Transcription (Reference)

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DN85 ZXSC400 1W/3W buck LED drivers Ray Liu, Applications Engineer, Zetex Semiconductors Description In Figure 1, ZXSC400 is configured as a high efficiency buck LED driver. The target applications are either 1W (350mA) or 3W (700mA) drivers for white LED driven from a 4 cell battery, or a 2 alkaline cell input for flashlights. The supply voltage for ZXSC400 reference design is: VIN = 3.8V to 6V. Parts lists for 1W and 3W design are shown in Table 1 and Table 2 respectively. Performance data is measured based on two different LED's VF binning with 0.3V VF difference. C3 VIN = 4V to 6V L1 D1 C2 U1 VCC Stdn VDRIVE VFB ISENSE Q1 R3 R2 C1 GND ZXSC400 R1 Figure 1 Schematic diagram Issue 1 - August 2007 © Zetex Semiconductors plc 2007 1 www.zetex.com DN85 Ref.