APPLICATION NOTE 4509

DC Voltage Controls PWM Dimming of High-Brightness LEDs (HB LEDs)

By: Jim Christensen

Abstract: This LED-driver circuit includes a hysteretic controller U1 (MAX16820), related power components, and a control circuit based on the quad op amp U2 (LMX324). U1 drives five HB LEDs from a 24V source, using only inductor L1, MOSFET Q1, and catch diode D1.