Robust and reliable power supply

The STMicroelectronics VIPer26K high-voltage converter integrates a 1050V avalanche-rugged N-channel power MOSFET enabling offline power supplies to combine a wide input-voltage range with the advantages of a simplified design. 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 small 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 MOSFET breakdown voltage, together with integrated features and minimal external circuitry lets designers save bill-of-materials costs 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. Additional benefits include internally fixed switching of frequency of 60kHz, jittered  ±4kHz, 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.

ST Microelectronics | www.st.com/viper26k-pr