HV9922

HV9921/HV9922/HV9923 3-Pin Switch-Mode LED Lamp Driver ICs Features Constant output current: - HV9921 – 20mA - HV9922 – 50mA - HV9923 – 30mA Universal 85 - 264VAC operation Fixed off-time buck converter Internal 475V power MOSFET Applications Decorative lighting Low power lighting fixtures Description HV9921/HV9922/HV9923 are pulse-width modulated (PWM), high-efficiency, LED driver control ICs. They allow efficient operation of LED strings from voltage sources ranging up to 400VDC. HV9921/22/23 include an internal high voltage switching MOSFET controlled with fixed off-time (TOFF) of approximately 10μs. The LED string is driven at constant current, thus providing constant light output and enhanced reliability. The output current is internally fixed at 20mA for HV9921, 50mA for HV992, and 30mA for HV9923. The peak current control scheme provides good regulation of the output current throughout the universal AC line voltage range of 85 to 264VAC or DC inp...