VIPER35HE

Overview

The VIPER35HE is a high voltage AC/DC converter from the VIPerPlus family, integrating an 800 V avalanche-rugged power MOSFET with a quasi-resonant current mode PWM controller. It supports isolated flyback topology and operates at a frequency limit of 225 kHz. The device features embedded HV start-up, built-in soft-start, and multifunction ZCD pin for zero-current detection. It ensures low consumption with burst mode operation under light loads, achieving less than 30 mW no-load condition at 230 VAC input. Protection mechanisms include output overvoltage, short-circuit, and hysteretic thermal shutdown, all with auto-restart capabilities.

Feature Summary

• Integrates an 800 V rugged power MOSFET with quasi-resonant current mode PWM control
• Features embedded high-voltage start-up and senseFET technology
• Supports isolated flyback topology with optocoupler feedback
• Includes comprehensive protection against output overvoltage, short-circuit, and thermal faults

Applications

• Wide-range AC input offline power supplies
• Adapters and chargers requiring high efficiency
• Standby power applications with strict energy saving standards

Procurement Notes

Verify the specific suffix 'HD' or 'HE' to confirm package type and frequency characteristics, as these determine physical dimensions and switching limits. Confirm RoHS compliance status and moisture sensitivity level prior to assembly. Ensure design accounts for the SIOC-16 Narrow or SO-16 package requirements depending on the exact variant ordered. Cross-reference datasheet revision history for any updates to electrical parameters or recommended operating conditions.

Selection Notes

Select this component for designs requiring high integration and low standby power consumption in offline converters. The quasi-resonant operation minimizes EMI and switching losses, making it suitable for compact power supply designs. Consider the 225 kHz frequency limit when designing magnetic components. Verify that the application benefits from the integrated brown-out detection and auto-restart protections before finalizing the selection.

Part Context

The VIPER35 series belongs to STMicroelectronics' VIPerPlus family of high-performance offline converters. These devices are designed to replace discrete solutions by integrating the power switch and controller into a single package. The family offers various options tailored for different frequency and packaging needs, supporting widespread adoption in consumer and industrial power supply applications.

Replacement Considerations

VIPER35HD is a direct functional equivalent within the same family, sharing identical electrical characteristics but potentially differing in package style or manufacturing lot specifications.