HV9961DB1, 21-Watt Universal AC LED Driver Demo Board with Accurate Average-Mode Constant Current Control

HV9961DB1, Demo Board is a high-brightness LED driver employing the patent-pending average-mode constant current control scheme. The power conversion stage of the HV9961DB1 consists of a diode bridge rectifier followed by a buck converter operating with fixed off-time of 20us. The HV9961DB1 LED driver features tight regulation of the LED current within a few milliamps over the entire range of the input AC line and the output LED string voltage. The LED current accuracy is almost insensitive to the passive component tolerances, such as the output filter inductance or the timing resistor