STMicroelectronics STNRGPF02 PFC controller

Click2Contact

STMicroelectronics is extending its range of digital power-supply controllers with the STNRGPF02 for two-channel interleaved boost-PFC topologies. Typical applications include industrial motors, air conditioners, domestic and commercial appliances, cellular base-stations, telecom infrastructure, data centre equipment and uninterruptible power supplies (UPS).

The controller is said to bring the advantages of digital power to applications from 600 W to 6 kW, including greater flexibility and faster design cycles compared with typical analog approaches. At the same time, system integration is claimed to be greater than other digital solutions that require a separate DSP or microcontroller.

The product operates in continuous-conduction mode (CCM) at fixed frequency with average current-mode control. An optimised blend of analog and digital control combines a hardware analog Proportional-Integral (PI) compensator in the inner current loop and a digital PI controller in the outer voltage loop, ensuring fast response. Cascaded control for the voltage and current loops regulates the output voltage by acting on the total average inductor current.

Designed for mechanical inrush-current control using an external relay or triac, the controller supports programmable phase shedding, load feed forward and burst mode to maximise energy efficiency. Built-in protection features include programmable fast-acting thermal and over-current protection (OCP), over-voltage protection (OVP) and soft-start management. PFC Fault and PFC OK status indicators are also provided.

The device is easily configured using eDesignSuite by inputting the converter specifications and running the configurator. The tool generates a full schematic, bill of materials (BOM) and binary object code as firmware ready to download via the IC’s serial communication port, which reduces the typical power-supply design cycle. The serial port also allows monitoring of the PFC parameters.

For more information: www.st.com/stnrgpf02-pr.