VIPER35LE

Overview

The VIPER35LE is a high-performance offline switcher from the VIPerPlus family, designed for quasi-resonant flyback AC/DC conversion. It integrates an 800V high-voltage MOSFET and a PWM controller into a single package. The device operates with a switching frequency of 136 kHz and supports output power up to 22 W. It functions within a supply voltage range of 8.5 V to 23.5 V and includes comprehensive protection features such as current limiting, over-temperature, and short-circuit protection.

Feature Summary

• Integrates an 800V high-voltage MOSFET with a quasi-resonant PWM controller for efficient offline power conversion.
• Features built-in fault protection mechanisms including cycle-by-cycle current limiting, thermal shutdown, and output short-circuit protection.
• Utilizes a proprietary quasi-resonant mode operation to minimize switching losses and electromagnetic interference (EMI).
• Includes a dedicated pin for external bypassing to further reduce noise and enhance system reliability.

Applications

• Adapters and chargers for portable electronic devices
• General purpose AC/DC power supplies
• Battery chargers for consumer electronics

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm the specific suffix indicates the correct package variant. Check for obsolescence status, as this model may be discontinued in favor of newer series replacements. Ensure compliance with RoHS directives if required by your manufacturing standards.

Selection Notes

Select this component for applications requiring isolated flyback topologies with moderate power levels around 22W. Consider the 800V breakdown voltage for high-line input requirements. Evaluate the thermal performance given the 150°C junction temperature rating. Compare against the VIPER35LD if a different package configuration is necessary for PCB layout constraints.

Part Context

This part belongs to the VIPerPlus family of integrated power switches. These devices combine high-voltage MOSFETs with intelligent control logic to simplify design. The VIPER35LE specifically targets cost-sensitive, high-volume applications where efficiency and reliability are critical. It represents an evolution in monolithic AC/DC converter technology.

Replacement Considerations

The VIPER35LD is listed as a similar available substitute. Verify pin compatibility and electrical specifications before substitution. Note that the VIPER35LE itself is marked as obsolete in some distributor catalogs.