VIPER26LD

Overview

The VIPER26LD is a high-voltage converter integrating an 800 V avalanche-rugged power MOSFET with PWM current mode control. It supports flyback, buck, and buck-boost topologies for offline power supplies in the 5–20 W range. The device features embedded HV startup, sense-FET, error amplifier, and oscillator with jitter. It meets stringent energy-saving standards with very low consumption and burst mode operation under light load.

Feature Summary

• Integrates an 800 V avalanche-rugged power MOSFET to allow wide AC input voltage ranges and reduced snubber circuit size.
• Includes embedded high-voltage startup, sense-FET, error amplifier, and oscillator with frequency jittering to minimize external components and EMI filter costs.
• Supports flyback, buck, and buck-boost converter designs with current mode PWM control.
• Features automatic restart protections against overload, short-circuit, feedback loop disconnection, and thermal shutdown.

Applications

• Offline power supplies for consumer electronics
• Adapters and chargers within the 5–20 W power range
• Flyback, buck, and buck-boost converter designs

Procurement Notes

Verify the specific suffix (e.g., LD) against the manufacturer's official datasheet to confirm pinout compatibility and package type. Ensure the selected variant matches the required switching frequency class (L or H type) for your EMI design constraints. Confirm RoHS compliance status directly from the ordering information section of the latest documentation.

Selection Notes

Select this component for applications requiring high integration and robustness against voltage spikes due to the 800 V avalanche rating. The jittered switching frequency helps reduce EMI filter requirements. Consider the DIP-7 package for ease of prototyping and manual soldering if applicable to the target assembly process.

Part Context

The VIPER26LD belongs to the VIPerPlus series of energy-saving high-voltage converters by STMicroelectronics. This series is designed to simplify power supply design by integrating the power switch and controller into a single IC, reducing component count and board space while maintaining high efficiency across various load conditions.

Replacement Considerations

Check for direct pin-to-pin replacements within the VIPerPlus family or other ST high-voltage converters with similar 800 V ratings and integrated control logic. Verify that any substitute maintains the same avalanche ruggedness and protection features to ensure system reliability without redesigning the snubber or protection circuits.