HV9921 Overview
The HV9921 is a pulse width modulated (PWM) high-efficiency LED driver control IC. It allows efficient operation of LED strings from voltage sources ranging up to 400VDC. The HV9921 includes an internal high voltage switching MOSFET controlled with fixed off-time (TOFF) of approximately 10.5μs.
HV9921 Key Features
- Constant output current: 20mA -- Universal 85
- 265VAC operation -- Fixed off-time buck converter -- Internal 475V power MOSFET
