Overview

The VIPer22A (VIPer22A-E / VIPer22ADIP-E) is an off-line monolithic switch-mode power supply (SMPS) primary switcher IC manufactured by STMicroelectronics. Available in an 8-pin through-hole DIP-8 and surface-mount SO-8 package, it monolithically integrates a state-of-the-art current-mode PWM controller with a rugged $730\text{V}$ breakdown avalanche-rugged power MOSFET on a single silicon die.

Delivering up to $12\text{ Watts}$ of isolated output power across universal mains ($85\text{V} \dots 265\text{V}$ AC) or up to $20\text{ Watts}$ at European line voltage ($230\text{V}$ AC) at a fixed switching frequency of $60\text{ kHz}$, the VIPer22A dramatically reduces component count in offline power systems. It supports both isolated flyback converters (with optocoupler feedback) and non-isolated offline buck converters (with direct resistor divider feedback), making it the premier choice for smart appliances (washing machines, microwaves, air conditioners), IoT gateways, LED drivers, and compact auxiliary power modules.

Quick reference

Pinout (DIP-8 Package)

                            ┌───┴───┐
       (Source / GND) SOURCE 1│ 1   8│ DRAIN (Integrated 730V MOSFET)
       (Source / GND) SOURCE 2│ VIPer 7│ DRAIN (Integrated 730V MOSFET)
       (Opto Feedback)    FB 3│  22A  6│ DRAIN (Integrated 730V MOSFET)
       (Supply Voltage)  VDD 4│ DIP-8 5│ DRAIN (Integrated 730V MOSFET)
                            └───────┘

Typical Application Circuit: Isolated 12V 1A Offline Flyback Converter

  Rectified 85V - 265V AC (+400V DC Bus)
                 │
                 ├───► [ Transformer Primary ] ───► [Pins 5-8: DRAIN]
                 │                                      VIPer22A
                 │                                  [Pins 1-2: SOURCE] ──► Primary GND
                 │
  Auxiliary Winding ──► [ 1N4148 Diode ] ──┬──────► [Pin 4: VDD]
                                           │            │
                                     [ 10µF Cap ]       └──► [Pin 3: FB] ──► [ PC817 Opto Collector ]
                                           │
                                      Primary GND

Non-Isolated Offline Buck Topology

In cost-sensitive smart home appliances, the VIPer22A can be configured as a non-isolated offline buck converter stepping $+325\text{V}$ rectified DC directly down to $+5\text{V}$ or $+12\text{V}$ without any custom transformer:

  +325V DC In ───► [Pins 5-8: DRAIN]
                      VIPer22A
                   [Pins 1-2: SOURCE] ───► [ 1mH Power Inductor ] ───► +12V DC Out (Non-Isolated)
                                                 │
                                      [ Ultrafast Catch Diode ]
                                                 │
                                            Primary GND

Common mistakes

• Leaving Pins 5, 6, 7, 8 unconnected from each other: Pins 5, 6, 7, and 8 are all internally connected to the internal power MOSFET's drain and act as the device's primary heatsink. On the PCB, connect all four pins to a broad copper pour for optimal thermal dissipation.
• Exceeding 50V on VDD pin: The $V_{DD}$ pin has an absolute maximum rating of $50\text{V}$. Ensure the auxiliary transformer winding turns ratio does not generate excessive voltage during light-load conditions.

Notes

• Suffix Guide: VIPer22ADIP-E is standard through-hole DIP-8; VIPer22AS-E is SO-8 surface-mount.