AP8803

Document number: DS31970 Rev. 5 - 2

1 of 10

www.diodes.com

August 2012

© Diodes Incorporated

AP8803

30V 1A BUCK LED DRIVER

Description

The AP8803 is a step-down DC/DC converter designed to drive LEDs

with a constant current. The device can drive up to 7 LEDs,

depending on the forward voltage of the LEDs, in series from a

voltage source of 8V to 30V. Series connection of the LEDs provides

identical LED currents resulting in uniform brightness and eliminating

the need for ballast resistors. The AP8803 switches at frequency up

to 700kHz. This allows the use of small size external components,

hence minimizing the PCB area needed.

Maximum output current of AP8803 is set via an external resistor

by applying either a DC voltage or a PWM signal at the CTRL input

pin. An input voltage of 0.2V or lower at CTRL shuts down the output

at SW and puts the device into a low-current standby state.

Features

•

LED Driving Current up to 1A

•

High Efficiency Up to 92%

•

Operating Input Voltage Up to 30V

•

High Switching Frequency Up to 700kHz

•

PWM/DC Input for Dimming Control

•

Built-In Output Open-Circuit Protection

•

TSOT25: Available in “Green” Molding Compound (No Br, Sb)

with lead Free Finish/ RoHS Compliant

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

1

2

3

4

5

SET

V

IN

CTRL

GND

SW

Top View

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen and Antimony free, "Green" and Lead-Free.

3. Halogen and Antimony free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)

and <1000ppm antimony compounds.

Typical Applications Circuit

L1

C1

AP8803

CTRL

SET

SW

GND

12V_DC