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VIPER22ASTR-E

Off-line Converter IC, 730V MOSFET, 60kHz, 7-12W, SO-8

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Manufacturer Part：

VIPER22ASTR-E

Package：

SO-8 (4.9 x 3.9 x 1.75 mm)

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Description

Product Overview

The VIPER22ASTR-E from STMicroelectronics is an off-line converter IC that combines a current-mode PWM controller with a high-voltage power MOSFET (730V breakdown) on the same chip. Operating at a fixed 60kHz switching frequency, it supports wide VDD voltage range of 9V to 38V and integrates multiple protection features including overtemperature, overcurrent, and overvoltage protection with auto-restart.

Key Specifications

MOSFET Breakdown Voltage 730V
RDS(on) 17 ohm max
Drain Current 0.7A nominal
Switching Frequency 60kHz fixed
VDD Range 9V to 38V
Output Power (SO-8) 7W wide range, 12W European
Control Mode Current mode PWM
Operating Temperature -40C to +150C
Package SO-8

Features

  • Integrated 730V power MOSFET and PWM controller
  • Fixed 60kHz switching frequency
  • Wide VDD voltage range (9V to 38V)
  • High-voltage startup current source
  • Automatic burst mode at light load
  • Overvoltage protection in HICCUP mode
  • Overtemperature, overcurrent, and overvoltage protection with auto-restart
  • Auxiliary undervoltage lockout with hysteresis

Applications

  • Battery charger adapters (5-12W)
  • TV and monitor standby power supplies
  • LED driver power supplies
  • Motor control auxiliary supplies
  • Smart meter power modules

The VIPER22ASTR-E from STMicroelectronics is an integrated off-line converter combining a current-mode PWM controller and a 730V power MOSFET on a single chip. Operating at a fixed 60kHz frequency, it delivers up to 7W (wide range 85-265VAC) or 12W (European 195-265VAC) in the SO-8 package. The device features a wide VDD range (9-38V) accommodating auxiliary supply variations, automatic burst mode for light-load efficiency, and comprehensive protection including overtemperature, overcurrent, and overvoltage with auto-restart capability.

The VIPER22ASTR-E integrates a high-voltage startup current source, PWM controller, and power MOSFET in a monolithic design. At startup, the internal current source charges the VDD capacitor through the drain pin until the UVLO threshold is reached. The PWM controller then begins switching the MOSFET at 60kHz, regulated by current-mode control. The feedback pin (FB) receives current from an optocoupler or auxiliary winding, controlling the duty cycle. When the output is lightly loaded, the device automatically enters burst mode by skipping switching cycles, reducing power consumption. Protection circuits monitor VDD for overvoltage, junction temperature for overtemperature, and drain current for overcurrent conditions.

Pin Name Type Function
1 VDD Power Supply voltage (9-38V)
2 FB Control Feedback input from optocoupler
3 SOURCE Power MOSFET source / current sense
4 DRAIN Power MOSFET drain / HV startup
5-8 DRAIN Power MOSFET drain connections
  • Small power AC-DC adapters and battery chargers (5-12W)
  • TV and monitor standby power supplies
  • LED lighting driver power supplies
  • Motor control board auxiliary power
  • Smart meter and IoT device power modules
Manufacturer Part Number Package Notes
STMicroelectronics VIPER12ASTR-E SO-8 Lower power version (5W)
STMicroelectronics VIPER22ADIP-E DIP-8 Through-hole version (12W)
Power Integrations LNK304DN DIP-8 Non-isolated buck converter
onsemi NCP1014ST SOT-223 Similar monolithic off-line converter
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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