STMicroelectronics VIPER22ADIP

Overview

VIPER22ADIP from STMicroelectronics is a high-voltage, current-mode PWM controller integrated with an 730 V avalanche-rated Power MOSFET in a DIP-8 package. It delivers up to 12 W (European mains) or 7 W (wide-range 85–265 Vac) off-line SMPS output, features fixed 60 kHz switching, 9–38 V wide VDD operating range, and built-in protections including overtemperature, overcurrent, and overvoltage with auto-restart. It is designed for battery charger adapters, TV/monitor standby supplies, and auxiliary motor control power.

For engineers reviewing the VIPER22ADIP datasheet, VIPER22ADIP pinout, VIPER22ADIP application, or VIPER22ADIP equivalent, key selection criteria include its integrated HV start-up current source, VDD hysteresis (6.5 V typ), FB pin current-sensing architecture (0.23 V reference), and thermal shutdown at 170 °C - all critical for reliable low-power offline flyback design under variable input and load conditions.

Technical Context

The VIPER22ADIP implements a monolithic current-mode control architecture where peak drain current is directly regulated via feedback current (IFB) into the FB pin, referenced to an internal 0.23 V comparator threshold. Its oscillator is temperature-compensated (±6% variation over 0–100 °C) and operates at 60 kHz ±10% across full VDD (9–38 V) and junction temperature (−40 to +150 °C) ranges.

Start-up is enabled by an internal high-voltage current source connected to the DRAIN pin, charging the external VDD capacitor until VDD reaches 14.5 V (VDDon); operation halts when VDD falls below 8 V (VDDoff), reactivating the start-up source. Protection functions - overvoltage (42 V VDDovp), overcurrent (0.7 A IDlim typ), and overtemperature (170 °C TSD) - all trigger hiccup-mode auto-restart without external circuitry.

Key Specifications

Pinout & Package

DIP-8 package (plastic dual in-line, 0.3 inch width), compliant with JEDEC MS-001, with exposed DRAIN pins (1, 2, 3, 4, 8) for thermal conduction and high-voltage isolation. Thermal resistance: R_thj-amb = 45 °C/W on standard FR4 board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar offline SMPS primary switcher applications.

Compared with VIPER22AS and LNK304P, VIPER22ADIP uniquely combines DIP-8 through-hole robustness, integrated HV start-up, and optimized burst-mode behavior - making it the preferred choice for cost-sensitive, thermally demanding, and manually assembled offline adapters requiring ≤12 W output.

Availability

VIPER22ADIP is available at Aetrix Electronics and suitable for battery charger adapters, TV/monitor standby supplies, and auxiliary motor control power systems requiring stable component supply across extended production lifecycles.

Supply support for VIPER22ADIP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and discrete devices for automotive, industrial, and consumer markets.

The VIPer™ family targets highly integrated, low-component-count AC-DC conversion solutions for sub-25 W applications - emphasizing safety, reliability, and ease of certification in universal-input offline power supplies.

FAQ

What is the purpose of the FB pin's current-sensing architecture?

The FB pin uses current-mode control with a 0.23 V internal reference comparator, enabling precise peak drain current regulation via injected feedback current (not voltage). This architecture supports accurate constant-current output for battery charging and simplifies optocoupler interface design by eliminating secondary-side error amplifiers.

Can VIPER22ADIP operate without an auxiliary winding?

Yes - its integrated high-voltage start-up current source draws from the DRAIN pin during initial power-on, allowing operation without an auxiliary winding. However, an auxiliary winding is required for sustained operation to maintain VDD above 8 V; otherwise, the device enters auto-restart cycling after VDD discharges.

How does the VDD hysteresis improve system reliability?

VDD hysteresis (6.5 V typical between 14.5 V turn-on and 8 V turn-off) prevents oscillatory behavior during marginal input conditions. It ensures clean start-up and controlled shutdown during brownouts, avoiding repeated switching attempts that could stress the MOSFET or cause audible noise in transformers.

What thermal derating applies to VIPER22ADIP in DIP-8 package?

With R_thj-amb = 45 °C/W on standard FR4, the device delivers full 7–12 W output up to 50 °C ambient. Above that, output power must be linearly reduced to keep junction temperature ≤150 °C; for example, at 70 °C ambient, max continuous output drops to ~8 W with adequate board copper area.