VIPer22A Dip-8 (Low Power Offline SMPS Primary Switcher IC)

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The Viper22A IC is popular SMPS buck controller device from the ViperXX series of ST Microelectronics. The controller can convert AC voltage from 85V to 265V and convert it to regulated DC voltage, it is commonly used as a replacement for transformer less power supply circuits.
This controller IC consists of an in-built PWM controller with a power MOSFET. The MOSFET is connected to the primary side a power Transformer which when switched will produce the required output voltage based on transformer design. Typical applications of this IC in power supplies for battery charger adapters, standby power supplies for TV or monitors, auxiliary supplies for motor control, etc.

Introduction to VIPER22A SMPS Controller IC




  • SMPS Switching Controller IC
  • AC to DC converter
  • Operating Voltage: 9V to 38V
  • Oscillator Frequency: 60 kHz typically
  • Mosfet Drain to Source Voltage: 730V
  • Off state drain current: 0.1mA
  • Rise time and Fall time 50ns and 100ns respectively
  • Available in PDIP and SO 8-pin package
  • Fall time: 100ns
  • Rise time: 50ns
  • Input Feedback Impedance: 1.2 Kohms


Symbol Parameters Values Units
VDS(sw) Switching drain source voltage (TJ = 25 … 125°C) -0.3 … 730 V
VDS(st) Start-up drain source voltage (TJ = 25 … 125°C) -0.3 … 400 V
ID Continuous drain current Internally limited A
VDD Supply voltage 0 … 50 V
IFB Feedback current 3 mA
VESD Electrostatic discharge:
Machine model (R = 0Ω; C = 200pF) 200 V
Charged device model 1.5 kV
TJ Junction operating temperature Internally limited °C
TC Case operating temperature -40 to 150 °C
Tstg Storage Temperature 55 to 150 °C




Pin Configuration

The pin configuration detail in tabular is mentioned below:

Pin Name Function
VDD Positive Power Supply
Drain MOSFET Drain pin
Source MOSFET Source pin/ Ground pin
FB Feedback Input pin It is current sensitive and serves to synchronize, regulate and protect the SMPS circuit.

VIPER22A Block Diagram

The block diagram for the integrated circuit for better understanding of the components is provided for the visual down below.

Introduction to VIPER22A SMPS Controller IC

VIPER22A Circuit Components

Introduction to VIPER22A SMPS Controller IC

The VIPER22A SMPS Power supply consists of different parts as listed below:



  • Input surge and fault protection circuit
  • Input Filter
  • Full wave Rectifier
  • Switching driver
  • Clamper
  • Magnetic and galvanic isolation.
  • EMI filter
  • Secondary Rectifier
  • Filter Section
  • Feedback mechanism.

VIPER22A Applications

  • SMPS Circuits
  • Low power systems
  • Industrial Applications
  • Battery Chargers
  • Automobiles
  • LED drivers
  • Remote Microcontroller designs
  • Auxiliary power Supply

VIPER22A Package

Introduction to VIPER22A SMPS Controller IC

VIPER22A Controller IC Datasheets



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