SY5842FAC

Single Stage Flyback And PFC Controller With Primary Side Control For LED Lighting

SY5842FAC Single Stage Flyback And PFC Controller With Primary Side Control For LED Lighting Datasheet

Parameters
Features
Description

Part number	SY5842FAC
Description
Topology	Flyback
Dimming mode
PF (>)	0.9
Input type	120/230Vac
Iout (max) (A)
Pout (max) (W)
Package	SO8
Application

High PF>0.9, Low THD<10%
Primary Side Control Eliminates the Opto-coupler
Valley Turn-on of the Primary MOSFET to Achieve Low Switching Losses
Input Over/Under Voltage Protection
Programmable Thermal Fold-back Function
Reliable Short LED and Open LED Protection
Quick Start up <500ms
Low Start up Current:34µA Typical
Package: SO8

The SY5842 is a single stage Flyback and PFC controller targeting at LED lighting applications. It is a primary side controller without applying any secondary feedback circuit for low cost, and drives the Flyback converter in the quasi-resonant mode to achieve higher efficiency. It integrates PFC compensating circuit to achieve high power factor and low THD while keeping accurate constant current. 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

EVB_SY5842FAC

EVB File

The EVB_SY5842FAC is intended for evaluating Single Stage Flyback and PFC Controller with Primary Side Control for LED Lighting

Technical Documentation

Title	Date
Silergy_Catalog_Q2_2026	2026-06-12

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