HV9919BK7-G Microchip

HV9919B Hysteretic, Buck, High Brightness LED Driver with High-Side Current Sensing Features Description Hysteretic control with high-side current sensing HV9919B is a Pulse-Width Modulation (PWM) control- Wide input-voltage range: 4.5 to 40V ler IC designed to drive high-brightness LEDs using a >90% Efficiency buck topology. It operates from an input voltage of 4.5 to 40VDC and employs hysteretic control, with a high- Typical 5% LED current accuracy side current sense resistor, to set the constant output Up to 2.0MHz switching frequency current. Adjustable constant LED current Analog or PWM control signal for PWM dimming Set the operating frequency range by selecting the Over-temperature protection proper inductor. Operation at high switching frequency is possible since the hysteretic control maintains accu- -40C to +125C operating temperature range racy even at high frequencies. This permits the use of small inductors and capacitors, minimizing space and Applications cost in the overall system. Low-voltage industrial and architectural lighting LED brightness control is achieved with PWM dimming General purpose constant current source from an analog or PWM input signal. Unique PWM cir- Signage and decorative LED lighting cuitry allows true constant color with a high dimming Indicator and emergency lighting range. The dimming frequency is programmed using a single external capacitor. HV9919B comes in a small, 8-Lead DFN package and is ideal for industrial and general lighting applications. Package Type CS 1 8 GATE VIN 2 7 GND GND 3 6 RAMP VDD ADIM 4 5 DIM 8-Lead DFN See Table 2-1 for pin information 2015 Microchip Technology Inc. 20005462B-page 1HV9919B Block Diagram REGULATOR VIN VDD + GATE - CS DRIVER CURRENT SENSE COMPARATOR GATE + BANDGAP DIM REF - UVLO COMPARATOR GND PWM RAMP RAMP - 0.1~1.9V + HV9919B ADIM Typical Application Circuit R L SENSE C IN VIN CS VDD RAMP GATE 0 - 2.0V ADIM DIM GND HV9919B 20005462B-page 2 2015 Microchip Technology Inc.