AP8802

1A LED Step-down Converter

AP8802 Rev. 5

1 of 16

DECEMBER 2009

DS31766

www.diodes.com

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LED driving current up to 1A

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High efficiency up to 92%

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Operating input voltage up to 48V

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

“Green” Molding Compound (No Br, Sb)

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Lead Free Finish/ RoHS Compliant (Note 1)

The AP8802 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

AP8802 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 AP8802 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

Figure 1:

Typical Application Circuit

Features

General Description

Applications