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DN84 - ZXSC400 Driving 3W high power LEDs

General Description

This design note shows the ZXSC400 driving a single 3W LED.

The input voltage ranges from 1.8V to 3.6V with constant output current of 700mA down to 2.6V with an overall 80% of efficiency.

Figure 1 shows typical constant current solution with ZXSC400 driving one 3W LED.

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Other Datasheets by Zetex (now Diodes Incorporated)

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DN85 ZXSC400 1W/3W buck LED drivers
DN86 Reduced component count and compact reference design

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DN84 ZXSC400 Driving 3W high power LEDs Ray Liu, Applications Engineer, Zetex Semiconductors Description This design note shows the ZXSC400 driving a single 3W LED. The input voltage ranges from 1.8V to 3.6V with constant output current of 700mA down to 2.6V with an overall 80% of efficiency. Figure 1 shows typical constant current solution with ZXSC400 driving one 3W LED. The input voltage range allows the use of two alkaline batteries or one Lithium Ion cell (CR123A) for portable flashlight applications. Q1 and Q2 forms a pseudo Darlington pair which provide enough current gain for a switching current up to 1.5A. In order to provide better switch off performance, a Schottky diode, D2, is used to drain the base current from the base of Q1 directly.