供应LED驱动IC芯片SU5100B

Universal High Brightness LED Driver  SU5100B

Features
? Switch mode controller for single switch LED  drivers
? Enhanced drop-in replacement to the SU5100
? Open loop peak current controller
? Internal 8.0V to 450V linear regulator
? Constant frequency or constant off-time  operation
? Linear and PWM dimming capability
? Requires few external components for  operation
Applications
? DC/DC or AC/DC LED Driver applications
? RGB Backlighting LED Driver
? Back Lighting of Flat Panel Displays
? General purpose constant current source
? Signage and Decorative LED Lighting  Chargers

General Description
The SU5100B is an open loop current mode control LED driver IC. The SU5100B can be programmed to operate in either a constant
frequency or constant off-time mode. It includes an 8 – 450V linear regulator which allows it to work from a wide range of input voltages without the need for an external low voltage supply. The SU5100B includes a PWM dimming input that can accept an external control signal with a duty ratio of 0 – 100% and a frequency of up to a few kilohertz. It also includes a 0 – 250mV linear dimming input which can be used for linear dimming of the LED current. The SU5100B is ideally suited for buck LED drivers. Since the SU5100B operates in open loop  current mode control, the controller achieves good output current regulation without the need for any loop compensation. PWM dimming response is limited only by the rate of rise and fall of the inductor current, enabling very fast rise and fall times. The SU5100B requires only three
external components (apart from the power stage) to produce a controlled LED current making it an ideal solution for low cost LED drivers