AP8800

350mA LED Step-down Converter

AP8800 Rev. 4

1 of 13

DECEMBER 2009

DS31764

www.diodes.com

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LED driving current up to 350mA

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Compatible with 12V & 24V standard systems

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High efficiency up to 92%

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High switching frequency up to 0.6MHz

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PWM/DC input for dimming control

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Built-in soft-start function

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Built-in output open-circuit protection

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SOP-8L, MSOP-8L and DFN3030-10 are available in

“Green” Molding Compound (No Br, Sb)

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Lead Free Finish/RoHS Compliant (Note 1)

The AP8800 is a step-down DC/DC converter designed to drive

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

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

from a voltage source of 8V to 28V. Series connection of the

LEDs provides identical LED currents resulting in uniform

brightness and eliminates the need for ballast resistors. The

AP8800 switches at frequency up to 0.6MHz.

This allows the

use of small size external components, hence minimizing the

PCB area needed.

Maximum output current of AP8800 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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Architecture Detail lighting

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Appliances interior lighting

Typical Application Circuit

Figure 1:

Typical Application Circuit

Features

General Description

Applications