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Date: 19-05-15

State Machine Event Driven digital power controller IC takes less CPU resources

STMicroelectronics is offering digital controller ICs for digital power conversion applications such as solar-power converters, EV charging stations, and industrial switched-mode power supplies (SMPS).

The STNRG digital-controller chips feature State Machine Event Driven (SMED) high-resolution pulse-width modulation (PWM) generator with an STM8-based supervisory core. The new devices integrate 32KB EEPROM, 6KB RAM, an ADC, op-amp, I2C port, and GPIOs.

The advantages of Configuring the SMED is, it doesn't need specialist software based control using DSP or microcontroller chip. The SMED can be triggered from the internal timer or an external event such as peak current, over current, or zero crossing. This allows a peak-current detecting buck converter, with constant off time set by the timer, to operate without intervention by the core processor. A simple P-I (proportional-integral) loop executed in the core sets the peak-current value for output regulation, explains ST Micro.

The STNRG IC family include STNRG288A with four SMED-controlled outputs, the STNRG328A with five SMEDs, and the STNRG388A with six SMEDs. Two SMEDs can be connected together to generate dual gate-drive signals with inserted dead time for half-bridge configurations. ST has already used in STLUX ICs for LED lighting for digital power control.

All devices are in production now, priced from $2.20 for the STNRG388A in TSSOP38 package, for orders of 1000 pieces.

ST Is displaying STNRG digital-controller family at the PCIM trade show (Booth 551/Hall 9) in Nuremberg, Germany, on May 19-21 2015.

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