LED 节能灯 电源驱动芯片 OS9910 资料

LED 节能灯 日光灯 电源驱动芯片 OS9910 资料

OS9910

Universal High Brightness LED Driver

Features

Switch mode controller for single switch LED driversEnhanced drop-in replacement to the OS9910Open loop peak current controllerInternal 8.0V to 450V linear regulator

Constant frequency or constant off-time operationLinear and PWM dimming capability

Requires few external components for operation

General Description

The OS9910 is an open loop current mode control LED driver IC. The OS9910 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 9910 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 OS9910 is ideally suited for buck LED drivers. Since the OS9910 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 OS9910 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.

Applications

DC/DC or AC/DC LED driver applicationsRGB backlighting LED driverBack lighting of at panel displays

General purpose constant current sourceSignage and decorative LED lightingChargers

Typical Application Circuit