VIPER35HD

Overview

The VIPER35HD is a high-voltage offline converter from the VIPerPlus family, integrating an 800 V avalanche-rugged power MOSFET with a quasi-resonant current mode PWM controller. It operates at a frequency limit of 225 kHz and supports isolated flyback topology. The device delivers up to 22 W output power with a supply voltage range of 8.5 V to 23.5 V. It features embedded high-voltage start-up, senseFET technology, and built-in soft-start. The IC ensures low no-load consumption (<30 mW) via burst mode operation and includes comprehensive protections such as output overvoltage, short-circuit, and hysteretic thermal shutdown.

Feature Summary

• Integrates an 800 V avalanche-rugged power MOSFET with quasi-resonant current mode PWM control for high efficiency and reduced EMI.
• Features embedded high-voltage start-up and senseFET technology, eliminating the need for auxiliary winding components.
• Supports isolated flyback topology with optocoupler and includes feed-forward compensation for improved regulation.
• Provides automatic restart capabilities following fault conditions including output overvoltage, short-circuit, and thermal shutdown.

Applications

• 15 W quasi-resonant flyback power supplies
• Adapters and chargers for consumer electronics
• General purpose AC/DC conversion systems

Procurement Notes

Verify the specific suffix (HD vs HDTR) to confirm packaging type, as HD indicates tube packaging while HDTR indicates tape and reel. Confirm RoHS compliance status and moisture sensitivity level requirements for your assembly process. Ensure the 16-SOIC package dimensions match your PCB footprint design constraints before finalizing procurement.

Selection Notes

Select the VIPER35HD when designing flyback converters requiring high input voltage ranges and strict energy saving standards. The H-type designation indicates a 225 kHz switching frequency limit, suitable for applications balancing size and performance. Consider the integrated protections if system reliability under fault conditions is critical. Verify that the 800 V MOSFET rating aligns with the maximum reflected drain voltage of your transformer design.

Part Context

The VIPER35HD belongs to the VIPerPlus family of high-performance offline converters. This series is designed to meet severe energy-saving standards by minimizing standby power consumption. The family integrates high-voltage power switches with intelligent control logic, reducing component count and board space in offline power supply designs.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult official STMicroelectronics resources for cross-reference information or equivalent family members within the VIPerPlus lineup.