SSL4101T - Flyback power supply controller IC with PFC for LED lighting


This device is no longer available.  Please see the EOL notice.

  • Integrated PFC and flyback controller
  • True universal mains supply operation: 70 V (AC) to 305 V (AC)
  • High level of integration, resulting in a:
  • - very low external component count
  • - cost-effective design
  • On-chip start-up current source
  • Valley/zero voltage switching for minimum switching losses
  • Frequency limitation to reduce switching losses
  • PFC is switched off when a low load is detected at the flyback output
  • Valley switching for minimum switching losses
  • Frequency reduction with fixed minimum peak current at low power operation
  • Safe restart mode for system fault conditions
  • Continuous mode protection by means of demagnetization detection
  • UnderVoltage Protection (UVP) (foldback during overload)
  • Accurate OverVoltage Protection (OVP) for both converters
  • Open control loop protection for both converters
  • IC overtemperature protection
  • Low and adjustable OverCurrent Protection (OCP)
  • General purpose input for latched protection

Typical Application


The SSL4101T combines a controller for Power Factor Correction (PFC)and a flyback controller. Its high level of integration allows the design of a cost-effective LED lighting application power supply with a very low number of external components. The built-in green functions provide high efficiency at all power levels. This applies to quasi-resonant operation at high power levels, quasi-resonant operation with valley skipping, as well as to reduced frequency operation at lower power levels. At low power levels, the PFC switches off to maintain high efficiency.


  • Industrial high-bay and low-bay lighting
  • Commercial interior lighting
  • Parking garage and area lighting
  • Street lighting