The device contains a multimode power-factor correction (PFC) controller, resonant half-bridge controller, and 800V start-up circuit, managed by a digital engine. The PFC controller changes dynamically between transition-mode, discontinuous-current mode (DCM), and valley skipping for optimum efficiency. The half-bridge controller executes ST’s patented time-shift control (TSC) for accurate soft switching.
With an input-voltage range up to 305VAC, the STNRG012 also operates from a DC supply targeting designs into both battery-powered and line-powered applications up to 300W.
The digital engine is hosted on an 8-bit core and performs optimised control algorithms. It manages the PFC and half-bridge circuits via high-speed state-machine event driven (SMED) peripherals. Additional dedicated hardware IP blocks including a power manager and burst-mode engine ensure robust operation and minimise power consumption in idle mode. System safety features including surge protection and anti-capacitive protection for the half bridge are built in, managed by hardware to ensure fast action for superior reliability.
The STNRG012 stores operating parameters and calibration coefficients on-chip in non-volatile memory (NVM), which allows users to customise settings and programme the device during production.
Digital programming saves external components traditionally used for configuration, reducing the bill of materials and circuit size. A UART port for monitoring and communication simplifies testing and enables real-time supervision for enhanced reliability.