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Dimmable LED controller IC


TopologyBuck Converter
Input voltage230 V
Output 195 V / 0.05 A
Output 210 V / 0.48 A
IC revision4


The SSL2129AT is a high-voltage Integrated Circuit (IC) for driving LED lamps in general lighting applications.The main benefits of this IC include:•Small Printed-Circuit Board (PCB) footprint and compact solution•High efficiency (up to 95 %) for non-dimmable high power factor solutions•High power factor (>0.9)•Ease of integration and many protection features•Low electronic Bill Of Material (BOM)•Mains phase-cut dimmable using external components•Highly flexible IC for use in buck, buck/boost and flyback modes•Single inductor used for non-isolated configurations because of internal demagnetization detection and dV/dt supplyThe IC range has been designed to start up directly from the HV supply using an internal high-voltage current source. An internal clamp limits the supply voltage.


  • LED controller IC for driving strings of LEDs or high-voltage LED modules from a rectified mains supply
  • Controller provides power-efficient boundary conduction mode of operation with:
  • No reverse recovery losses in freewheel diode
  • Zero-Current Switching (ZCS) for switch turn-on
  • Zero-voltage or valley switching for switch turn-off
  • Minimal required inductance value and size
  • Fast transient response through cycle-by-cycle current control:
  • No over or undershoots in the LED current
  • Simple high input power factor solution (>0.9)
  • Internal Protection features:
  • UnderVoltage LockOut (UVLO)
  • Leading-Edge Blanking (LEB)
  • OverCurrent Protection (OCP)
  • Internal OverTemperature Protection (OTP)
  • Brownout protection
  • Mains phase cut dimmable LED driver solution:
  • Supports both leading and trailing-edge dimmers
  • Easy external temperature protection with a single NTC
  • Open output protection using external components
  • Compatible with wall switches with built-in indication light during standby
  • IC lifetime easily matches or surpasses LED lamp lifetime
  • Input current distributed evenly over the phase, reducing required output capacitor size and bleeder dissipation

Typical applications



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