Diodes AP3036/A Manuel d'utilisateur télécharger pdf

Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3036/A

Jul. 2012 Rev. 1.3. BCD Semiconductor Manufacturing Limited

General Description

The AP3036/A is an inductor-based DC/DC

converter designed to drive up to eight white LEDs in

series for backlight. Only one feedback resistor is

needed to control the LED current and obtain

required brightness.

A constant frequency 1.0MHz PWM control scheme

is employed in this IC, which means tiny external

components can be used. Specifically, 1mm tall

inductor and 0.22µF output capacitor for a typical

application is sufficient. Additionally, the Schottky

diode in boost circuit is integrated on this chip. The

AP3036/A also provides a disable pin to ease its use

for different systems.

The output over-voltage protection is implemented in

AP3036/A. When any LED is broken or in other

abnormal conditions, the output voltage will be

clamped.

The AP3036/A is available in standard SOT-23-6 and

TSOT-23-6 packages.

Features

•

Inherently Uniform LED Current

• High Efficiency up to 84%

• No Need for External Schottky Diode

• Output Over-voltage Protection (OVP)

• Fixed 1.0MHz Switching Frequency

• Uses Tiny 1mm Tall Inductor

• Requires Only 0.22µF Output Capacitor

• High Frequency Dimming Control

Applications

• Cellular Phones

• Digital Cameras

• LCD Modules

• GPS Receivers

• PDAs, Handheld Computers

Figure 1. Package Types of AP3036/A

SOT-23-6 TSOT-23-6

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