SY23401CFAC (SY50131CFAC)

Flyback Regulator with Primary Side CV/CC Control For Adapters and Chargers

SY23401CFAC Flyback Regulator with Primary Side CV/CC Control For Adapters and Chargers Datasheet

Parameters
Features
Description

Part number	SY23401CFAC
Pout (max) (W)	3.5
HV startup	NO
Operation mode	QR
Integrated FETs type	BJT
Breakdown voltage (V)	980
Ron (typ) (mΩ)
No load loss (mW)	<75
Switching frequency (min)(kHz)	2
Switching frequency (max)(kHz)	90
Features	PSR CC/CV,Cable compensation
Package	SO8
Operating temperature range(°C)	-40 to 125
Functional safety category

Tight PSR CC/CV Regulation Over Entire Operating Range
QR-mode Operation for High Efficiency
PWM/PFM Control for High Average Efficiency
Fast Dynamic Load Transient Response
Cable Compensation for Better Load Regulation
Low Start Up Current: 5μA Max
Minimum Frequency Limitation 2kHz
No-load Power is Less than 100mW
Reliable Protections for OVP, UVP, SCP, OTP,OCP
Reliable Protections for Safety Requirement
Maximum Switching Frequency Limitation 90kHz
Integrated 980V Bipolar NPN Transistor
RoHS Compliant and Halogen Free
Compact Package: SO8

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Evaluation Board

Photo of evaluation board
Photo of evaluation board

EVB_SY23401CFAC

The EVB_SY23401CFAC is used to evaluate a single stage Flyback regulator targeting at Constant Current/Constant Voltage (CC/CV) applications.

Technical Documentation

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