特性 Features

? Wide 5V to 32V Input Voltage Range

? Output Adjustable from 0.8V to 30V

? Maximum Duty Cycle 100

? Minimum Drop Out 0.6V

? Fixed 300KHz Switching Frequency

? 12A Constant Output Current Capability

? Internal Optimize Power MOSFET

? High efficiency

? Excellent line and load regulation

? Built in thermal shutdown function

? Built in current limit function

? Built in output short protection function

? Available in TO-220 package

Applications

? LCD Monitor and LCD TV

? Digital Photo Frame

? Set-up Box

? ADSL Modem

? Telecom / Networking Equipment

General Description

The XL4012 is a 300 KHz fixed frequency

PWM buck (step-down) DC/DC converter,

capable of driving a 12A load with high

efficiency, low ripple and excellent line and

load regulation. Requiring a minimum

number of external components, the regulator

is simple to use and include internal

frequency compensation and a

fixed-frequency oscillator.

The PWM control circuit is able to adjust the

duty ratio linearly from 0 to 100. An over

current protection function is built inside.

When short protection function happens, the

operation frequency will be reduced from

300KHz to 60KHz. An internal compensation

block is built in to minimize external

component count.