VIPER25LN

Overview

The VIPER25LN is an off-line switch-mode power supply controller from the VIPerPlus family, designed for AC/DC conversion. It integrates a high-voltage startup circuit and an 800 V avalanche rugged power section. The device employs pulse width modulation (PWM) with current-mode control and supports flyback topology. Key electrical parameters include a switching frequency of 225 kHz, a maximum input voltage of 23.5 V, and an operating input voltage range of 8.5 V to 23.5 V. It features a low operating supply current of 3.5 mA and delivers an output current capability of 1.5 A. The component operates within a temperature range of -40 °C to +150 °C and is housed in a 7-pin DIP package.

Feature Summary

• Integrates an 800 V avalanche rugged power section for high-voltage off-line applications
• Features quasi-resonant control for valley switching operation to reduce electromagnetic interference
• Includes built-in protections such as hysteretic thermal shutdown, overvoltage protection, and safe auto-restart after fault conditions

Applications

• Industrial applications requiring isolated AC/DC conversion
• General purpose offline power supplies
• Adapters and chargers meeting standby energy saving regulations

Procurement Notes

Verify the specific suffix 'LN' against the manufacturer's official datasheet to confirm the exact pinout and packaging configuration, as variations exist within the VIPerPlus family. Ensure compliance with RoHS standards if required by your application specifications. Cross-reference the part number with the latest STMicroelectronics documentation to confirm availability status and any potential obsolescence notices before finalizing procurement plans.

Selection Notes

Select this component for designs requiring a single-chip solution for low-power offline converters. The integrated high-voltage startup simplifies the design by eliminating external start-up resistors. Consider the 7-pin DIP package for through-hole mounting requirements. Evaluate the 225 kHz switching frequency against EMI filter constraints and the <50 mW standby power consumption against efficiency regulations.

Part Context

The VIPER25LN belongs to the VIPerPlus family of high-performance off-line converters. This series is characterized by its ability to combine power switching and control functions into a single monolithic IC. The family targets cost-sensitive applications where board space and component count are critical. The VIPER25 variant specifically offers a balance of performance and robustness for general-purpose power supply designs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.