The device contains a multimode power-factor correction (PFC) controller, resonant half-bridge controller, and 800V startup circuit that’s all 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 battery-powered and line-powered applications up to 300W.
The digital engine is hosted on an eight-bit core and performs optimized 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 minimize 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, which allows users to customize settings and program the device during production. Digital programming also saves external components traditionally used for configuration, reducing the bill-of-materials and circuit size.
An UART port for monitoring and communication simplifies testing and enables real-time supervision for enhanced reliability.
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