Digital power combination controller protects with overload management
For applications requiring overload stability and regulation, STMicroelectronics’ STNRG011A is digital power combination controller for 90W to 300W power supplies. It features enhanced overload management that ensures output-voltage regulation when over-current protection is active.
The compact device is suitable for use in power adapters, chargers, and television and lighting power supplies. It integrates a power factor correction controller, LLC resonant half-bridge controller, 800V start up circuitry and supervisory engine.
The multi-mode PFC controller implements features such as input voltage feed forward, a distortion optimiser and frequency limitation. The digital supervisory engine features an eight-bit core and dedicated peripherals, with digital algorithms stored in internal ROM.
The STNRG011A is an enhanced version of the existing STNRG011, with new overload-management algorithm to increase the switching frequency when over-current protection is triggered. In addition to maintaining output-voltage regulation, this also prevents unwanted shutdown of the power supply.
It also features on-chip, non-volatile memory for storing configuration parameters and calibration data, which reduces the number of external components required. It also allows the device to be customised for specific application requirements.
There is also a two-pin UART port for monitoring and communication, which simplifies testing and allows real-time supervision and remote management, said ST. PFC and half-bridge protection are built in, as well as X-capacitor discharge circuitry compliant with IEC 62368-1 which helps minimise standby power.
The STNRG011A is in production now, in a SO20 package.
