Offline LED Driver

This design is a simple nonisolated LED driver that is intended to operate directly from a 400VDC input. It can basically drive a string of 27 white LEDs or 6 amber LEDs at 400mA. It uses the MAX16801 high brightness LED driver control that is well suited for universal input (rectified 85VAC to 265VAC) LED drivers. It features an input undervoltage lockout (UVLO) for programming the input-supply start voltage, and to ensure proper operation during brownout conditions and has has an internal-bootstrap undervoltage lockout circuit with a large hysteresis that simplifies offline LED driver designs. Read more