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IC manufacturers NXP

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NXP SSL21084

Mains dimmable LED controller IC


TopologyBuck Converter
Input voltage170-260 V
Output 1130 V / 0.1 A
IC revision2


The SSL21082 and SSL21084 are high-voltage Integrated Circuits (IC) for driving retrofit LED lamps in general lighting applications. They enable the implementation of a very compact low-cost system solution. The IC’s have an integrated internal HV switch and work as Boundary Conduction Mode (BCM) buck converter.

The SSL21082 and SSL21084 are supplied by a start-up bleeder resistor, a dV/dt supply using capacitive coupling from the drain or any other auxiliary supply. The IC supply current is low. An internal clamp limits the supply voltage.

They have accurate output current control and can be operated using Pulse-Width Modulation (PWM) dimming. In addition, several protection features are available such as easy external temperature feedback.


  • LED controller IC for driving strings of LEDs or high-voltage LED modules from a rectified mains supply
  • Power-efficient boundary conduction mode 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 overshoot or undershoot 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)
  • Short-winding protection (SWP); SSL21082T/SSL21084T only
  • Internal OverTemperature Protection (OTP)
  • Brownout protection
  • Mains phase cut dimmable LED driver solution:
  • Supports both leading-edge 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

Remarks:L1=1.5mH L2=3.3mHUsed.

Typical applications

  • mains dimmable compact LED lamps


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Power Inductor
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