SD42511

1A WHITE LED DRIVER WITH PWM DIMMING CONTROLLER

DESCRIPTION

The SD42511 is a step-down PWM control LED driver with a built-in

internal power MOSFET. It achieves 1A continuous output current over

a wide input supply range. It provides thermal shutdown circuit, current

limiting circuit and PWM dimming circuit.

SD42511 adopts current mode contro

provides fast transient response and simple loop stabilization design.

SD42511 has high efficiency up to more than 90%, and has excellent

constant current characteristic when the input/output voltage changed,

with the excellent current accuracy within ±1%. With the high input

voltage of up to 25V and built-in slope compensation, it can drive 6

LEDs.

FEATURES

* Maximum 1A output current

* 0.25

Ω built-in power MOSFET

* PWM dimming function

* 280KHz fixed frequency

* Excellent constant current accuracy ±1%

* High efficiency up to 90%

* Thermal shutdown

* Cycle-by-cycle over current protection

* 6-25V input voltage range

* Drive LED string

ORDERING INFORMATION

Device

Package

SD42511

SOP-8-225-1.27

APPLICATIONS

* Power LED driver

BLOCK DIAGRAM

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.3

2008.11.19

Http://www.silan.com.cn

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