1kV MOSFET converter simplifies power supply design

July 29, 2019 //By Nick Flaherty
1kV MOSFET converter boosts power supply design
STMicroelectronics has launched a high-voltage converter with a 1050V avalanche-rugged N-channel power MOSFET to give offline power supplies a wide input-voltage range

The high voltage rating of the VIPer26K MOSFET eliminates the need for conventional stacked FETs and associated passive components to achieve similar voltage capability, and smaller external snubber components can be adopted. Drain current-limit protection is built-in and the MOSFET includes a senseFET connection for over-temperature protection.

With high-voltage startup circuitry, a built-in error amplifier, and current-mode PWM controller all integrated on-chip, the VIPER26K 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 breakdown voltage, together with a complete set of integrated features and minimal external circuitry, lets designers reduce the bill-of-materials and board space while boosting reliability in applications such as power supplies for 1-phase and 3-phase smart energy meters, 3-phase industrial systems, air-conditioners, and LED lighting.

It has a fixed switching of frequency of 60kHz and jitter of ±4kHz, which combined with control of the MOSFET gate current during turn-on and turn-off to minimize switching-noise emissions. High power-conversion efficiency and no-load consumption less than 30mW help achieve high energy ratings and stringent eco-design approvals.

The VIPer26K is in production now, in SO-16N package, and priced from $0.64 for 1000-piece orders.

www.st.com

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