ZLED7002 datasheet(10/14 Pages) ETC2

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ZLED7002

Toggle (Side-Step) Dual-Channel LED Driver

Data Sheet

August 10, 2011

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Application Circuit Design

3.1.

Applications

The ZLED7002 is designed for small battery-powered lighting life-time critical applications. Capable of operating efficiently with

DC voltage supplies ranging from 2.7V to 5.5V, it is ideal for small portable lighting applications. Typical applications include

helmet lighting, head / t ail lights for bicycles, miner lamps, pocket lights, and various other general purpose low-voltage

industrial and consumer LED applications.

Figure 3.1

Basic ZLED7002 Application Circuit

3.2.

Application Circuit Layout Requirements

The following guidelines are strongly recommended when laying out application circuits:

• Use a 0.1µf capacitor connected between the UV pin and ground to minimize noise picked up on the UV pin. Place the

capacitor close to the UV pin.

• If the application includes a switch as shown in Figure 3.1, locate it at the lowest voltage point to avoid sparks when

switching.

• Use traces that are as short and wide as possible for any traces leading to actual ground that occur between the GND

pin and Iset pin. This improves accuracy for the MAIN LED current and the under-voltage threshold.

Also see Table 5.1 for connection requirements.

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