SY22651FAC (SY5881FAC)

Single Stage Buck PFC Controller For LED Dimming Lighting

SY22651FAC Single Stage Buck PFC Controller For LED Dimming Lighting Datasheet

Parameters
Features
Description

Part number	SY22651FAC
Description	CC, buck PFC controller, PWM/analog dimming, 5%
Topology	Buck
Dimming mode	Analog, PWM
PF (>)	0.9
Input type	120VAC, 230VAC
Iout (max) (A)
Pout (max) (W)	500
Package	SO8
Application	Buck, PWM/Analog dimming, PFC

High Dimming Accuracy
Dimming Range from 5.5% to 100%
CV Mode for Bias Supply at <2.5% Dimming Signal
Valley Turn-on of the MOSFET to Achieve Low Switching Losses
Quick Start Up <500ms
Internal High Current MOSFET Driver: 200mA Sourcing and 650mA Sinking
Low Start Up Current: 34μA Typical
Reliable Short LED and Open LED Protection
Power Factor >0.90
RoHS Compliant and Halogen Free
Compact Package: SO8

The SY22651 is a single stage Buck PFC controller targeting at LED lighting applications with PWM or Analog dimming. It is a Buck converter operates in the quasi-resonant mode to achieve higher efficiency and keeps in constant on time operation to achieve high power factor. It adopts special design to achieve quick start up and reliable protection for safety requirement.

Evaluation Board

Photo of evaluation board
Photo of evaluation board
Photo of evaluation board

EVB_SY22651FAC

EVB File

The EVB_SY22651FAC is intended for evaluating AC 90~264V input, 48V/340mA output Boost PFC Regulator

Technical Documentation

Title	Date
Silergy_Catalog_Q2_2026	2026-06-12
SO8	2022-05-20