Configurable interleaved PFC controller simplifies access to digital-power advantages

The STNRGPF01 SMPS controller from STMicroelectronics delivers the flexibility and high efficiency of digital power without the technical challenges and time to develop custom DSP code. STMicro will showcase a 3 kW industrial SMPS evaluation board featuring the STNRGPF01 at its booth at APEC 2017, March 26-30, in Tampa, Florida.


In high-power applications above 1 or 2 kW, interleaved CCM (continuous-current mode) PFC topologies are mandatory to handle such power levels with reasonable magnetic volume and current split. Moreover, the quest for higher efficiency, connectivity, and configuration options encourages the use of expensive and complex DSP solutions.


ST’s new SMPS controller for interleaved boost-PFC topologies is configured using ST’s eDesignSuite online design environment, and has I2C and UART interfaces for monitoring and control. It supports three interleaved phases, which ensures low ripple currents, simplifies EMI-filter design using small-size inductors, and permits a power range from 500 W to over 20 kW. Additionally, the STNRGPF01’s flexible, configurable phase-shedding strategy optimizes the number of active phases automatically to maintain high efficiency across all load conditions.


The STNRGPF01 operates in CCM at fixed frequency with average-current-mode control. A hardware inner-current loop ensures accurate cycle-by-cycle regulation, while a digital proportional-integral (PI) controller manages the outer voltage loop to ensure fast dynamic response. The frequency can be programmed from a few kHz to over 300 kHz, to control either an IGBT or MOSFET output stage. Other configurable features include inrush-current limiting and PFC soft power-on.

The STNRGPF01 is in full production, packaged as a TSSOP38, priced from $3.50 for orders of 1000 pieces.

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