The Microchip HV9921 is a PWM LED Driver IC that can drive LED strings from voltage sources of 20 to 400VDC, or 85 to 265VAC, providing a 20mA Constant-Current output., Prąd wyjściowy = 20mA, Napięcie wejściowe = 20 - 400 V AC, Napięcie wejściowe AC lub D