SY23406ZFAC (SY50136ZFAC)

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

SY23406ZFAC Flyback Regulator with Primary Side CV/CC Control For Adapters&Chargers Datasheet

Parameters
Features
Description

Part number	SY23406ZFAC
Pout (max) (W)	18
HV startup	NO
Operation mode	QR
Integrated FETs type	MOS
Breakdown voltage (V)	650
Ron (typ) (mΩ)	2.2
No load loss (mW)	<75
Switching frequency (min)(kHz)	0.5
Switching frequency (max)(kHz)	125
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 500Hz
No-load Power is Less than 50mW
Reliable Protections for OVP, SCP, OTP,OCP
Reliable Protections for Safety Requirement
Maximum Switching Frequency Limitation 125kHz
Integrated 620V/2.2ΩMOSFET
RoHS Compliant and Halogen Free
Compact Package: SO8

Evaluation Board

Photo of evaluation board
Photo of evaluation board

EVB_SY23406Z

EVB File

SY23406Z is a single stage Flyback regulator targeting at Constant Current/Constant Voltage (CC/CV) applications. It integrates a 600V/2Ω MOSFET in a compact SO8 package to minimize the size. Both the output current and voltage are sensed on the primary side, eliminating the opto-isolator and the secondary side feedback circuitry, and minimizing the overall system cost.

Technical Documentation

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