HV9922

† Mounted on FR4 board, 25mm x 25mm x 1.57mm. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifi cations is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The HV9921/HV9922/23 are pulse width modulated (PWM) high-effi ciency LED driver control ICs. They allow effi cient operation of LED strings from voltage sources ranging up to 400VDC. The HV9921/22/23 include an internal high voltage switching MOSFET controlled with fi xed off-time T_OFF of approximately 10s. The LED string is driven at constant current, thus providing constant light output and enhanced reliability. The output current is internally fi xed at 20mA for HV9921, 50mA for HV9922, and 30mA for the 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 input voltage of 20 to 400V.