Microchip Technology HV9931
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 reliability.| Part No. | HV9931 |
|---|---|
| Datasheet | HV9931 Download |
| Manufacturer |  Microchip Technology |
| Description | Unity Power Factor LED Lamp Driver |
| Buy | Stock & Price |
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 and Phase Dimming
APPLICATIONS
● Offline LED Lamps and Fixtures● Street Lamps
● Traffic Signals
● Decorative Lighting
GENERAL DESCRIPTION
The HV9931 uses open-loop peak current control to regulate both input and output currents. This control technique eliminates the need for loop compensation, limits the input inrush current, and is inherently protected from Input Undervoltage condition. Capacitive isolation protects the LED Lamp from failure of the switching MOSFET. The HV9931 provides a low-frequency PWM dimming input that accepts an external control signal with a duty ratio of 0% to 100% and a frequency of up to a few kilohertz. The PWM dimming capability enables HV9931 phase control solutions that can work with standard wall dimmers.
