Combination controller averts power supply shutdown

Integrating a power-factor correction (PFC) controller, LLC resonant half-bridge controller, 800V startup circuitry, and supervisory engine, this device 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 optimiser, 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 customised 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.