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SY22651ZFAC (SY5881ZFAC)

Production
DC/DC Buck Controller For LED Dimming Lighting
Datasheet
SY22651ZFAC DC/DC Buck Controller For LED Dimming Lighting Datasheet
Part number SY22651ZFAC
Description CC, buck controller, PWM/analog dimming, 2%
Topology Buck
Dimming mode Analog, PWM
PF (>) 0.5
Input type 40 to 400VDC
Iout (max) (A)
Pout (max) (W) 500
Package SO8
Application Buck, PWM/Analog dimming
  • Linear Dimming Curve.
  • Dimming Range from 2.5% to 100.0%.
  • CV Mode for Bias Supply when PWM=0%
  • Valley Turn-on to Achieve Low Switching Losses
  • Single Winding Inductor with Floating Topology
  • 200mA  Sourcing Current and 600mA Sinking Current Drive Capability
  • Low Start up Current: 34μA typical
  • Reliable Short LED and Open LED Protection
  • Reliable Short ISEN Resistor Protection
  • Compact Package: SO8

The SY22651Z is a DC/DC Buck controller targeting at LED lighting applications with analog dimming. It adopts the proprietary control architecture to achieve an accurate regulation of LED current and Quasi-Resonant valley turn-on high efficiency operation.

The SY22651Z supports analog dimming function and it has a linear dimming curve. 

It integrates open/short LED protection and eliminates the auxiliary winding with floating topology, thus minimizing the component count and board size.

Evaluation Board

  • 2022-02-21_151302

    Photo of evaluation board

  • 2022-02-21_151314

    Photo of evaluation board

EVB_SY22651ZFAC

The EVB_SY22651ZFAC is intended for evaluating  AC 176~264V input, 72V/300mA output DC/DC Buck Controller With Primary Side Control For LED Lighting And Mutiple Dimming Option

Technical Documentation

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