STMicroelectronics VIPER20ADIP-E

Overview

VIPER20ADIP-E from STMicroelectronics is a 700V, 0.5A integrated primary-side SMPS controller combining a current-mode PWM controller and a vertical high-voltage Power MOSFET in a single DIP-8 package. It delivers up to 20W in single-range offline power supplies, features adjustable 90–110 kHz switching frequency, internal 13V VDD regulation, and burst-mode operation enabling <1W standby consumption per Blue Angel requirements.

For engineers reviewing the VIPER20ADIP-E datasheet, VIPER20ADIP-E pinout, VIPER20ADIP-E application, or VIPER20ADIP-E equivalent, this device serves as a compact, component-reducing solution for primary- or secondary-regulated AC/DC converters targeting industrial, consumer, and appliance power supplies with strict efficiency and safety constraints.

Technical Context

This IC implements current-mode control using an integrated SenseFET to monitor primary peak current, with a transconductance error amplifier (Gm = 1.5 mA/V) and programmable oscillator (RT/CT network). The 250 ns blanking time prevents false triggering from parasitic spikes during MOSFET turn-on.

It integrates undervoltage lockout (UVLO) with 3V hysteresis (8V off / 11V on), overtemperature shutdown at 140–190°C with 40°C hysteresis, and a high-voltage start-up current source tied to the Drain pin-enabling direct connection to rectified mains without external bias circuitry.

Key Specifications

Pinout & Package

Package: DIP-8 (dual in-line package), through-hole mount, compatible with standard wave-soldering processes and legacy board layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar primary-side SMPS controller applications.

Compared with ICE2QS03G and LNK306P, VIPER20ADIP-E offers superior surge immunity (700 V), built-in HV start-up, and deterministic burst-mode timing-making it optimal for cost-sensitive, space-constrained, and regulatory-driven offline power designs where predictable EMI and minimal external components are critical.

Availability

VIPER20ADIP-E is available at Aetrix Electronics and suitable for smart home adapters, industrial PLC power rails, white goods auxiliary supplies, and LED driver control stages requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.

Supply support for VIPER20ADIP-E 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 analog, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

VIPER series ICs are ST's dedicated family of integrated primary-side SMPS controllers targeting cost-effective, compact, and compliant AC/DC conversion for appliances, adapters, and industrial equipment.

FAQ

What is the maximum continuous output power achievable with VIPER20ADIP-E in a standard flyback design?

In single-range operation with proper heatsinking and optimized transformer design, VIPER20ADIP-E supports up to 20 W continuous output power. At 230 V_AC input, thermal limits and R_DS(on) derating constrain practical operation to 15–18 W under full-load, 40°C ambient conditions. Derating curves in Section 2 of the datasheet confirm 57 W P_TOT at T_C = 25°C, but PCB layout and airflow significantly impact real-world capability.

Can VIPER20ADIP-E operate with primary-side regulation only-without an optocoupler or auxiliary winding?

Yes-VIPER20ADIP-E supports primary-side regulation using its internal 13 V VDD reference and the VDD pin as feedback node. The device regulates output by monitoring reflected auxiliary voltage across the transformer's auxiliary winding, eliminating need for optocoupler or TL431. However, accuracy is ±5–7% across line/load/temperature, making it suitable for non-critical rails like logic supplies but not precision analog rails.

How does the internal blanking time prevent false overcurrent shutdown during MOSFET turn-on?

The VIPER20ADIP-E applies a fixed 250 ns blanking window after each MOSFET turn-on event, during which the current-sense comparator is disabled. This suppresses false triggers caused by transformer leakage inductance ringing and secondary rectifier reverse recovery spikes-both common in flyback topologies. The blanking interval aligns precisely with typical drain voltage overshoot duration, preserving true peak current limiting integrity.

Is the DIP-8 package of VIPER20ADIP-E lead-free and RoHS-compliant?

Yes-VIPER20ADIP-E is manufactured in a RoHS-compliant, lead-free DIP-8 package per STMicroelectronics' ECOPACK2 specification. The device meets JEDEC J-STD-020 moisture sensitivity level MSL3 and supports standard SnPb or lead-free wave soldering profiles. Full compliance documentation, including substance declarations and test reports, is available in ST's official product change notices (PCNs) for order code VIPER20ADIP-E.