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Compact non-dimmable LED driver IC


TopologyBuck Converter
Input voltage170-260 V
Output 1130 V / 0.1 A
IC revision6


The SSL21083T is a high-voltage Integrated Circuit (IC) for driving LED lamps in general mains non-dimmable lighting applications.

The main benefits are:

•Small Printed-Circuit Board (PCB) footprint; compact solution•High efficiency (up to 95 %)•Ease of integration•Low electronic Bill Of Material (BOM)The IC incorporates a 600 V MOSFET.

The IC works as boundary conduction mode converters, typically in buck configuration. It has been designed to start up directly from the HV supply by an internal high-voltage current source. Thereafter, the dV/dt supply is used with capacitive coupling from the drain or any other auxiliary supply. This function provides full flexibility in the application design. The IC consumes 1.3 mA of supply current with an internal clamp limiting the supply voltage.

The IC provides accurate output current control with LED current accuracy within 5 %. The IC can be operated using Pulse-Width Modulation (PWM) current regulation. It has many protection features including easy LED temperature feedback.


  • LED driver ICs for driving LED strings from a rectified mains supply
  • High-efficiency switch mode buck driver product family:
  • drivers with integrated 600 V (DC) power switches
  • Controller with power-efficient boundary conduction mode of operation with:
  • No reverse recovery losses in freewheel diode
  • Zero Current Switching (ZCS) for turn-on of switch
  • Zero voltage or valley switching for turn-on of switch
  • Minimal required inductance value and size
  • Direct PWM current regulation possible
  • Fast transient response through cycle-by-cycle current control:
  • Negligible AC mains ripple at LED current and minimal total capacitor value
  • No over or undershoots in the LED current
  • Internal protections:
  •  UnderVoltage LockOut (UVLO)
  •  Leading-Edge Blanking (LEB)
  •  OverCurrent Protection (OCP)
  •  Internal OverTemperature Protection (OTP)
  •  Brownout protection
  •  Output Short Protection (OSP)
  •  Low component count LED driver solution (see Figure 3):
  •  No Schottky diode required due to ZCS
  •  Easy external temperature protection with a single NTC resistor
  •  Option for soft-start function
  •  Compatible with wall switches with built-in indication light during standby1
  •  IC lifetime easily matches or surpasses LED lamp lifetime

Typical applications

  • non-dimmable LED lighting application


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Power Inductor
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