HB-LED-driver chip set provides dimming, PFC

摘要

A chip-set pair from On Semiconductor provides high-efficiency, HB (high-brightness)-LED drive and dimming. The multistage, resonant, half-bridge NCL30051 LED driver delivers a constant voltage to a step-down dc/dc converter/LED driver, such as the NCL30160. The device, which combines a critical-conduction mode, a PFC controller, and a half-bridge resonant controller with a built-in 600V driver, targets use in offline power supplies. The NCL30051 's half-bridge stage operates at a fixed frequency. You achieve regulation by adjusting the PFC-stage output voltage.