SY22650BFAC (SY5018BFAC)

Single Stage Flyback and PFC Controller with CV Control

SY22650BFAC Single Stage Flyback and PFC Controller with CV Control Datasheet

Parameters
Features
Description

Part number	SY22650BFAC
Description	Single stage PSR Flyback CV PFC controller, QR
Topology	Flyback
Dimming mode	Non-dimming
PF (>)	0.9
Input type	120VAC, 230VAC
Iout (max) (A)
Pout (max) (W)	80
Package	SO8
Application	Flyback CV, PFC

Primary Side CV Control Eliminates the Opto-coupler
Valley Turn-on of the Primary MOSFET to Achieve Low Switching Losses
Internal High Current MOSFET Driver: 0.1A Sourcing and 0.5A Sinking
Power Factor >0.90 with Single-stage Conversion
Maximum Switching Frequency Limitation 100kHz
Output Current Limit, about 1.2 Times the Rated Current
RoHS Compliant and Halogen Free
Compact Package: SO8

SY22650B is a single stage Flyback and PFC controller targeting at Constant Voltage (CV) applications. Primary side control is applied to reduce the feedback circuit cost. It drives the Flyback converter in the Quasi-Resonant mode for high efficiency and achieves high power factor by constant on time control scheme. Adaptive PWM/PFM control is adopted for highest average efficiency.

Evaluation Board

Photo of evaluation board
Photo of evaluation board

EVB_SY22650BFAC

EVB File

The EVB_SY22650BFAC is intended for evaluating AC 85~264V input, 40V/0.9A output Single Stage Flyback And PFC Adapters

Technical Documentation

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