ZLED7002 Datasheet

© 2016 Integrated Device Technology, Inc.

9

April 20, 2016

VCC

Iset

UV

SUB

MAIN

GND

NC

NC

ZLED7002

D1

MAIN

LED

SUB

LED

R2

R3

C1

+

DC

-

2.7 to 5.5 V

SW1

R4

R1

3

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.