STMicroelectronics has launched the STNRG012, a highly integrated digital power controller for LED lighting applications. It integrates a multimode PFC controller, a resonant half-bridge controller, and an 800-V startup circuit, managed by a digital engine. For improved efficiency, the PFC controller changes dynamically between transition-mode, discontinuous-current mode (DCM), and valley skipping, while the half-bridge controller executes ST’s patented time-shift control (TSC) for soft switching.
Click for a larger image. (Image: STMicroelectronics)
With an input-voltage range up to 305 VAC, the space-saving digital power controller also operates from a DC supply targeting designs in both battery-powered and line-powered applications up to 300 W.
The digital engine is hosted on an 8-bit core and manages the control algorithms as well as 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 helps minimize power consumption in idle mode. Safety features including surge protection and anti-capacitive protection for the half bridge are built in.
In terms of flexibility, the STNRG012 stores operating parameters and calibration coefficients on-chip in non-volatile memory (NVM). This allows users to customize settings and program the device during production. Digital programming also saves external components traditionally used for configuration, said ST, which reduces the bill of materials and circuit size. It also includes a UART port for monitoring and communication that simplifies testing and enables real-time supervision for higher reliability.
Click for a larger image. (Image: STMicroelectronics)
The STNRG012, housed in a 20-pin small-outline (SO-20) package, is available in volume production and is priced at $2.08 each in quantities of 1,000.
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