STMicroelectronics

VIPER22AS

VIPER22AS Description

The VIPER22AS from STMicroelectronics is an obsolete but historically significant offline switch designed for flyback topology in AC/DC converter applications. This surface-mount IC integrates a 730V breakdown voltage MOSFET, enabling robust performance in isolated power supplies up to 7W. With a 60kHz switching frequency, it offers efficient power conversion while operating from a wide input voltage range (8V to 38V). The device features a low startup voltage (14.5V), reducing auxiliary circuit complexity. Although no longer in production, its legacy design remains relevant for maintenance or legacy system support.

VIPER22AS Features

• Integrated High-Voltage MOSFET: 730V rating ensures reliability in harsh line conditions.
• Comprehensive Protection: Includes current limiting, over-temperature, and over-voltage fault protection.
• Wide Vcc Range (8V–38V): Supports flexible design configurations.
• 60kHz Fixed Frequency: Optimizes efficiency and reduces EMI filter size.
• Low Startup Current (14.5V): Minimizes standby power consumption.
• RoHS3 & REACH Compliant: Meets environmental standards despite obsolete status.
• Compact 8SOIC Package: Saves board space in surface-mount designs.

VIPER22AS Applications

Ideal for low-power offline SMPS designs, the VIPER22AS excels in:

• Auxiliary Power Supplies: For industrial controls, appliances, and IoT devices.
• Consumer Electronics: Chargers, adapters, and LED drivers.
• Legacy System Maintenance: Repair or replacement of aging power modules.
• Isolated DC/DC Converters: Where robust protection and compact size are critical.

Conclusion of VIPER22AS

While the VIPER22AS is obsolete, its high integration, robust protection features, and efficiency made it a benchmark for low-power flyback converters. Engineers seeking replacements should consider modern STMicroelectronics alternatives, but the VIPER22AS remains a viable option for legacy designs or niche applications requiring its specific performance profile.