HV9919B Overview
HV9919B is a Pulse-Width Modulation (PWM) controller IC designed to drive high-brightness LEDs using a buck topology. It operates from an input voltage of 4.5 to 40VDC and employs hysteretic control, with a highside current sense resistor, to set the constant output current. Set the operating frequency range by selecting the proper inductor.
HV9919B Key Features
- Hysteretic control with high-side current sensing
- Wide input-voltage range: 4.5 to 40V
- >90% Efficiency
- Typical ±5% LED current accuracy
- Up to 2.0MHz switching frequency
- Adjustable constant LED current
- Analog or PWM control signal for PWM dimming
- Over-temperature protection
- 40ºC to +125ºC operating temperature range