SY22817ABC (SY5007ABC)

Flyback Controller with Primary Side CC/CV Control

SY22817ABC Flyback Controller with Primary Side CC/CV Control Datasheet

Parameters
Features
Description

Part number	SY22817ABC
Pout (max) (W)	75
HV startup	NO
Operation mode	QR
Driving FETs type	MOS
No load loss (mW)	<75
Switching frequency (min)(kHz)	0.5
Switching frequency (max)(kHz)	125
Features	PSR CC/CV,Cable compensation
Package	SOT23-6
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
Reliable Protections for OVP, SCP, OTP,OCP
Reliable Protections for Safety Requirement
Maximum Switching Frequency Limitation 125kHz
RoHS Compliant and Halogen Free
Compact Package: SOT23-6

Evaluation Board

Photo of evaluation board
Photo of evaluation board

EVB_SY22817

EVB File

SY22817 is a single stage Flyback controller targeting at Constant Current/Constant Voltage (CC/CV) applications. 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