Power Electronics
NXP

Flyback Controller IC with PFC

The NXP SSL8516T combines a controller for Power Factor Correction (PFC) and a flyback controller. Its high level of integration enables cost-effective LED lighting application power supply design using a very low number of external components.

The specially built-in green functions provide high efficiency at all power levels. At high power levels, the flyback operates in QR mode or DCM with valley detection. At medium power levels, the flyback controller switches to Frequency Reduction (FR) mode and limits the peak current to an adjustable minimum value. It ensures high efficiency while minimizing the audible noise from the transformer. In low power mode, the PFC switches off to maintain high efficiency. Valley switching is used in all operating modes.

The SSL8516T 75W 48V 1.6A dimmable isolated LED driver demo board employing the SSL8516T (shown).

Features and benefits:

  • Universal mains supply operation between 90 V (AC) to 305 V (AC)
  • Power-down functionality for very low standby power
  • Valley/Zero-Voltage Switching (ZVS) for minimum switching losses
  • PFC switched off when a low-load is detected at the flyback output
  • Valley/Zero-Voltage Switching (ZVS) for minimum switching losses
  • PFC switched off when a low-load is detected at the flyback output
  • Frequency reduction with adjustable minimum peak current at low-power operation maintains high-efficiency at low output power levels
  • Safe restart mode for system fault conditions
  • UnderVoltage Protection (UVP)
  • Accurate OverVoltage Protection (OVP)
  • Mains voltage independent OverPower Protection (OPP)
  • Open control loop protection for both converters
  • OverTemperature Protection (OTP)
  • Low and adjustable OverCurrent Protection (OCP) trip level for both converters
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