STMicroelectronics enhances digital power combination controller for overload stability and regulation

STMicroelectronics’ STNRG011A digital power combination controller for 90W to 300W power supplies features enhanced overload management that ensures accurate output-voltage regulation when overcurrent protection is active.

Integrating a power-factor correction (PFC) controller, LLC resonant half-bridge controller, 800V startup circuitry, and supervisory engine, the STNRG011A is used in power adapters, chargers, and television and lighting power supplies. The multi-mode PFC controller implements performance-enhancing features including input-voltage feedforward, a distortion optimizer, and frequency limitation. The digital supervisory engine features an 8-bit core and dedicated peripherals, with digital algorithms stored in internal ROM to ensure reliability and a minimal bill of materials (BoM).

Compared to the existing STNRG011, the STNRG011A with its new overload-management algorithm increases the switching frequency when overcurrent protection is triggered. In addition to maintaining output-voltage regulation, this also prevents unwanted shutdown of the power supply.

Further features include on-chip non-volatile memory for storing configuration parameters and calibration data, which saves external components and allows the device to be customized for specific application requirements. There is also a 2-pin UART port for monitoring and communication, which simplifies testing and allows real-time supervision and remote management. PFC and half-bridge protection are built in, as well as X-capacitor discharge circuitry compliant with IEC 62368-1 that helps minimize standby power.

The STNRG011A is in production now, in a SO20 package, priced from $2.08 for orders of 1000 pieces.

For further information, please visit www.st.com/stnrg

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