TS19450

TS19450 Taiwan Semiconductor AC/DC WLED Driver with External MOSFET Universal High Brightness DESCRIPTION The TS19450 is an open loop, current mode control LED driver IC. It can be programmed to operate in either a constant frequency or constant off-time mode. It includes an 8V~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 TS19450 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 kHz. It also includes a 0~250mV linear dimming input which can be used for linear dimming of the LED current. The TS19450 is ideally suited for buck LED drivers. Since it 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 TS19450 requires only free external components (apart from the power stage) to produce a controlled LED current making it an ideal solution for low cost LED drivers. FEATURES ● Switch mode controller for single switch LED drivers ● Open loop peak current controller ● Internal 8V~450V linear regulator ● Constant frequency or constant off-time operation ● Linear and PWM dimming capability ● Requires few external components for operation APPLICATION ● DC/DC or AC/DC LED driver applications...