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The VIPer26K from STMicroelectronics is a high-voltage offline converter which combines both a PWM current-mode control block and a 1050V avalanche-rugged power stage.

Integrating a high-voltage start-up circuit, sense transistor, error amplifier with 3.3V reference, and oscillator with jitter into a single converter chip, the VIPer26K enables the designer to realize a complete high-voltage converter operating from an AC or DC input with a small number of components. Support for jittered switching reduces the cost of EMI filtering and helps achieve compliance with the requirements of EMC standards.

The VIPer26K supports the most common topologies for switch-mode power supplies, including:

  • Isolated flyback with optocoupler
  • Primary-side regulation
  • Non-isolated flyback with resistive feedback
  • Buck
  • Buck-boost

The high 1050V breakdown voltage offered by the VIPer26K’s power MOSFET enables the device to handle an extended input-voltage range, and to reduce the size of the drain snubber circuit.

The device features low power consumption and operates in burst mode when supplying light loads, helping designers to comply with strict energy-saving regulations.


1050V high-voltage converter for robust and reliable power supplies

1050V high-voltage converter for robust and reliable power supplies


  • Drain-current limit protection:
    • -500mA for the VIPER265K
    • -700mA for the VIPER267K
  • <30mW standby power at 230V AC
  • Safe auto-restart after a fault condition
  • Hysteretic thermal shut-down protection
  • Built-in soft-start
  • Energy metering
  • Auxiliary power supplies for industrial systems with a three-phase input
  • LED lighting
  • Air-conditioning units


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