SSL8516BT - Flyback power supply controller IC with PFC and burst mode for LED lighting

Features

 

  • Integrated PFC and flyback controller
  • Universal mains supply operation between 90 V (AC) to 305 V (AC)
  • High level of integration, results in cost-effective designs with very low external component counts
  • On-chip start-up current source
  • Power-down functionality for very low standby power
  • Valley/Zero-Voltage Switching (ZVS) for minimum switching losses
  • Frequency limitation reduces switching losses
  • PFC switched off when a low-load is detected at the flyback output
  • Valley/Zero-Voltage Switching (ZVS) for minimum switching losses
  • Frequency limitation reduces switching losses
  • PFC switched off when a low-load is detected at the flyback output
  • Valley switching for minimum switching losses
  • Frequency reduction with adjustable minimum peak current at low-power operation maintains high-efficiency at low output power levels
  • Burst mode operation at very low-power levels for high-efficiency operation
  • 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
  • General-purpose input for latched protection

Typical Application


Description

  The SSL8516BT 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. In low-power mode, the PFC switches off to maintain high efficiency. At very low power levels, when the flyback switching frequency drops to below 25 kHz, the flyback converter switches to burst mode. During the non-switching phase of the burst mode, the internal IC supply current is minimized to further optimize efficiency. Valley switching is used in all operating modes.

Applications

 

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