HV9925SG-G Microchip

HV9925 Programmable Current LED Lamp Driver IC with PWM Dimming Features General Description Programmable Output Current up to 50 mA The HV9925 is a pulse-width modulated high-efficiency Pulse-Width Modulation (PWM) Dimming/Enable LED driver control IC with PWM dimming capabilities. It Universal 85 VAC to 264 VAC Operation allows efficient operation of high-brightness LED strings from voltage sources ranging up to 400 VDC. Fixed Off-Time Buck Converter The HV9925 includes an internal high-voltage Internal 475V Power MOSFET switching MOSFET controlled with a fixed off-time of Overtemperature Protection with Hysteresis approximately 10.5 s. The LED string is driven at constant current, thus providing constant light output Applications and enhanced reliability. Selecting a current sense resistor value can externally program the output LED Decorative Lighting current of the HV9925. Low-Power Lighting Fixtures The peak current control scheme provides good regulation of the output current throughout the universal AC line voltage range of 85 VAC to 264 VAC or DC input voltage of 20V to 400V. The HV9925 is designed with a built-in thermal shutdown to prevent excessive power dissipation in the IC. Package Type 8-lead SOIC (Top view) RSENSE 1 8 DRAIN GND 2 7 DRAIN PWMD 3 6 DRAIN EP VDD 4 5 NC Heat Slug Heat slug (exposed thermal pad) is at ground potential. See Table 3-1 for pin information. 2019 Microchip Technology Inc. DS20005723A-page 1HV9925 Functional Block Diagram GND VDD DRAIN 7.5V PWMD T = 10.5s OFF S Q REF - R Q + Over Temperature T = 300ns BLANK HV9925 RSENSE DS20005723A-page 2 2019 Microchip Technology Inc.