XL2576 DCDC降压恒流LED驱动芯片

Features „

Wide 4.5V to 40V Input Voltage Range „

5V,12V and adjustable versions „

Output Adjustable from 1.23V to 37V „

Maximum Duty Cycle 100% „

 Minimum Drop Out 1.5V „

Fixed 52KHz Switching Frequency „

3A Constant Output Current Capability „

Internal Optimize Power Transistor „

High efficiency „

Excellent line and load regulation „

 TTL shutdown capability „

ON/OFF pin with hysteresis function „

Built in thermal shutdown function „

Built in current limit function

„ Available in TO-220,TO-263 packages

Applications „

LCD Monitor and LCD TV „

Digital Photo Frame „

Set-up Box „

ADSL Modem „

Telecom / Networking Equipment

General Description

  The XL2576 is a 52 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 3A 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 enable function, an over current protection function is built inside. An internal compensation block is built in to minimize external component count.