STMicroelectronics VIPer26K high-voltage converter

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The STMicroelectronics VIPer26K high-voltage converter integrates a 1050 V avalanche-rugged N-channel power MOSFET that enables offline power supplies to combine a wide input-voltage range with the advantages of a simplified design.

The high voltage rating of the MOSFET eliminates the need for conventional stacked FETs and associated passive components to achieve similar voltage capability, according to the company, and smaller external snubber components can be adopted. Drain current-limit protection is built in and the MOSFET includes a senseFET connection for overtemperature protection.

With high-voltage start-up circuitry, a built-in error amplifier and current-mode PWM controller all integrated on-chip, the product can support all common switched-mode power supply topologies, including isolated flyback with secondary-side or primary-side regulation, non-isolated flyback with resistive feedback, buck and buck-boost converters.

The high MOSFET breakdown voltage, together with a complete set of integrated features and minimal external circuitry, are said to let designers save on board space. These features are particularly useful in applications such as power supplies for one- and three-phase smart energy meters, three-phase industrial systems, air conditioners and LED lighting.

Additional benefits include internally fixed switching of frequency of 60 kHz and jittered ±4 kHz, combined with control of the MOSFET gate current during turn-on and turn-off to minimise switching-noise emissions. High power-conversion efficiency and no-load consumption less than 30 mW help achieve high energy ratings and stringent eco-design approvals, according to the company.

For more information: www.st.com/viper26k-pr.