SY22847BFAC (SY50271BFAC)

AC Input Buck Regulator

Parameters
Features
Description

Part number	SY22847BFAC
Pout (max) (W)	4.3
HV startup	YES
Iout (max) (A)	0.36
Vout (typ)(V)	12V
Breakdown voltage (V)	650
Ron (typ) (mΩ)	9
Switching frequency (min)(kHz)	37
Switching frequency (max)(kHz)	40
Operation mode	CCM/DCM
No load loss (mW)	<50
Features	Multi-off-time control
Package	SO8
Operating temperature range(°C)	-40 to 125
Functional safety category

Integrated 650V MOSFET
High Voltage Startup Circuit
50mW No-Load Power Consumption
Multi-Off-Time Control
Minimal External Components
Overtemperature Protection (OTP)
Output Overvoltage Protection (OVP)
Compact Package: SO8

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Evaluation Board

Photo of evaluation board
Photo of evaluation board

EVB_SY22847BFAC

The EVB_SY22847BFAC is intended for evaluating AC Input Buck Regulator

Technical Documentation

Title	Date
Silergy_Catalog_Q2_2026	2026-06-12