AP3030(2009) Просмотр технического описания (PDF) - BCD Semiconductor

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AP3030
(Rev.:2009)

WHITE LED STEP-UP CONVERTER

BCD Semiconductor 

WHITE LED STEP-UP CONVERTER

General Description

Features

Data Sheet

AP3030

The AP3030 is an inductor-based DC/DC converter

designed to drive up to eight white LEDs in series or 2

rows of LEDs with 5 for each in parallel for backlight.

Only one feedback resistor is needed to control the

LED current and obtain required brightness.

A constant frequency 1.2MHz PWM control scheme is

employed in this IC, which means tiny external com-

ponents can be used. Specifically, 1mm tall inductor

and 0.22µF output capacitor for a typical application

are sufficient. Additionally, the schottky diode in boost

circuit is integrated on this chip. AP3030 also provides

a disable pin to ease its use for different systems.

The output over-voltage protection is implemented in

AP3030. When any LED is broken or in other abnor-

mal conditions, the output voltage will be clamped.

The AP3030 is available in standard SOT-23-6 and

TSOT-23-6 packages.

· Inherently Uniform LED Current

· High Efficiency up to 84%

· No Need for External Schottky Diode

· Output Over-Voltage Protection (OVP)

· Fixed 1.2MHz Switching Frequency

· Uses Tiny 1mm Tall Inductor

· Requires Only 0.22µF Output Capacitor

Applications

· Cellular Phones

· Digital Cameras

· LCD modules

· GPS Receivers

· PDAs, Handheld Computers

Oct. 2009 Rev. 1. 6

SOT-23-6

TSOT-23-6

Figure 1. Package Types of AP3030

BCD Semiconductor Manufacturing Limited

1

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