SD42511

www.DataSheet4U.com 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 control. Current mode operation 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 * 0.25Ω 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 SD42511 Package SOP-8-225-1.27 APPLICATIONS * Power LED driver BLOCK DIAGRAM HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http://www.silan.com.cn REV:1.0 2008.03.13 Page 1 of 9 www.DataSheet4U.com SD42511 ABSOLUTE MAXIMUM RATING Characteristics Supply Voltage Switch Voltage Boost Voltage Feedback Voltage PWM Voltage Comp Voltage LED Voltage Junction Temperature Lead Temperature Storage Temperature Input Voltage Operatin...