AP8801

500mA LED Step-down Converter

AP8801 Rev. 4

1 of 11

DECEMBER 2009

DS31765

www.diodes.com

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LED driving current up to 500mA

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Operating input voltage up to 48V

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High efficiency up to 92%

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High switching frequency up to 500kHz

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PWM/DC input for dimming control

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Built-in output open-circuit protection

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SOP-8L and MSOP-8L are available in “Green”

Molding Compound (No Br, Sb)

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Lead Free Finish/RoHS Compliant (Note 1)

The AP8801 is a step-down DC/DC converter designed to drive

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

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

from a voltage source of 8V to 48V. Series connection of the

LEDs provides identical LED currents resulting in uniform

brightness and eliminating the need for ballast resistors. The

AP8801 switches at frequency up to 500kHz.

This allows the

use of small size external components, hence minimizing the

PCB area needed.

Maximum output current of AP8801 is set via an external resistor

Dimming is

achieved 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.

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Commercial & industrial lighting

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Small LCD panel backlight

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Appliances interior lighting

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Architecture Detail lighting

Typical Application Circuit

AP8801

SET

SW

CTRL

GND

24V_DC

Figure 1:

Typical Application Circuit

Features

General Description

Applications