VIPER27HN

Overview

The VIPER27HN is a high-performance off-line high voltage converter from the VIPerPlus family, designed for fixed-frequency operation at 115 kHz. It integrates an 800 V rugged power section with PWM control, over-current protection, and hysteretic thermal shutdown. The device supports flyback topology with a maximum duty cycle of 80% and operates within an input voltage range of 8.5 V to 23.5 V. It features soft-start, safe auto-restart, and burst mode for low standby consumption below 50 mW at 265 Vac. The component is housed in a 7-pin PDIP package.

Feature Summary

• Integrates an 800 V avalanche rugged power section with embedded high voltage start-up circuit
• Features PWM operation with frequency jittering to reduce EMI filter costs
• Includes on-board soft-start and safe auto-restart after fault condition removal
• Supports burst mode operation for meeting standby energy saving regulations

Applications

• Auxiliary power supplies for LCD or plasma TVs
• Power modules for desktop computers
• Standby power for USB ports and remote receivers
• General purpose AC/DC converters for consumer electronics

Procurement Notes

Verify the specific suffix 'HN' corresponds to the 7-pin PDIP package and 115 kHz switching frequency variant. Confirm that the orderable part number matches the required lead frame finish and tape/reel or tube packaging specifications provided by the manufacturer. Ensure compatibility with RoHS compliance standards if applicable to your region.

Selection Notes

Select this component for designs requiring a fixed 115 kHz switching frequency to optimize transformer size compared to lower frequency variants. It is suitable for applications needing integrated high-voltage startup and robust protection against overload and overheating. Consider the 7-pin DIP package constraints for PCB layout and thermal management requirements in enclosed spaces.

Part Context

The VIPER27HN belongs to the VIPerPlus family of offline converters, which are known for combining high voltage MOSFET technology with intelligent control logic. This family targets cost-sensitive, high-volume consumer applications where efficiency and component count reduction are critical. The H suffix typically denotes the higher frequency variant within the VIPER27 series.

Replacement Considerations

The VIPER27LN serves as a direct functional substitute offering the same pinout and protections but operates at a fixed 60 kHz frequency. Verify that the lower switching frequency meets the magnetic component design requirements of the target application.