HV9931 Datasheet | Supertex

Initial Release HV9931 Unity Power Factor LED Lamp Driver Features Constant Output Current Large Step-Down Ratio Unity Power Factor Low Input Current Harmonic Distortion Fixed Frequency or Fixed Off-Time Operation Internal 450V Linear Regulator Input and output current sensing .. Input Current limit Enable, PWM and Phase Dimming General Description The HV9931 is a fixed frequency PWM controller IC designed to control an LED lamp driver using a single-stage PFC buckboost-buck topology. It can achieve a unity power factor and a very high step-down ratio that enables driving a single high-brightness LED from the 85-264VAC input without a need for a power transformer....