HV9919B

HV9919B Hysteretic, Buck, High Brightness LED Driver with High-Side Current Sensing 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 Applications Low-voltage industrial and architectural lighting General purpose constant current source Signage and decorative LED lighting Indicator and emergency lighting Description 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. Ope...