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DN70 - ZXSC400 Driving 2 serial high power LEDs

General Description

This design note shows the ZXSC400 driving 2 serial LEDs.

The input voltage ranges from 2V to 3.6V with a maximum output current of 360mA from 2.6V input.

Figure 1 shows a typical constant current solution with the ZXSC400 driving two 1W LEDs in series.

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DN70 ZXSC400 Driving 2 serial high power LEDs Description This design note shows the ZXSC400 driving 2 serial LEDs. The input voltage ranges from 2V to 3.6V with a maximum output current of 360mA from 2.6V input. Figure 1 shows a typical constant current solution with the ZXSC400 driving two 1W LEDs in series. The wide input voltage range allows the use of different battery cell combinations. This could be dual alkaline cells with voltage starting from 3V down to 2V or triple NiCad/NiMH cells with voltage starting from 3.6V down to 2.7V. www.DataSheet4U.com VIN=1.8V to 3.6V L1 D1 Q1 U1 Vcc Stdn Vdrive Isense VFB C2 C1 Gnd ZXSC400 R1 R2 Figure 1 Ref.