HV9931 Description
The HV9931 is a fixed-frequency PWM controller IC designed to control an LED lamp driver using a single-stage PFC buck-boost-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 85 VAC to 264 VAC input without a power transformer. This topology allows reducing the filter capacitors and using non-electrolytic capacitors to improve...
HV9931 Key Features
- Constant Output Current LED Driver
- 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 Pulse-Width Modulation (PWM) Dimming