Power Factor Correction (PFC) and Flyback Controller 16-Pin SOIC Dry Pack

The GreenChip is the latest generation of green Switched Mode Power Supply (SMPS) controller ICs. 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 PFC operates in Quasi-Resonant (QR) or Discontinuous Conduction Mode (DCM), with valley switching. 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 optimize efficiency further. Valley switching is used in all operating modes. The advanced burst mode ensures high efficiency at low power and good standby power performance while minimizing audible transformer noise. The SSL8516BT is a Multi-Chip Module (MCM), containing two chips. The proprietary high-voltage BCD800 process makes direct start-up possible from the rectified universal mains voltage in an effective and green way. The second low voltage Silicon-On-Insulator (SOI) is used for accurate, high-speed protection functions and control. The SSL8516BT enables easy design of highly efficient and reliable LED lighting application power supplies between 25 W and 300 W. LED drivers in particular benefit from the high level of integration. The IC meets the lighting class C requirements on mains current harmonics as specified by IEC 61000-3-2 over a wide input voltage range and a wide output power range.

• Integrated PFC and flyback controller
• Universal mains supply operation between 90 V (AC) to 305 V (AC)
• Fixed boost PFC with accurate maximum output voltage (NXP Semiconductors patented)
• High level of integration, results in cost-effective designs with very low external component counts
• Adjustable PFC switch off delay
• External PFC switch on and switch off override
• Accurate PFC switch on and switch off control (NXP Semiconductors patents: EP2566024A1, US20130057170, CN102969909 A)