VIPER35HDTR

Overview

The VIPER35HDTR is a high-voltage offline switch from the VIPerPlus family, integrating an 800 V avalanche-rugged power MOSFET with a quasi-resonant current mode PWM controller. It operates at a switching frequency 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 and a breakdown voltage of 800 V. It features embedded HV start-up, senseFET technology, and low no-load consumption (<30 mW). Protection includes current limit, thermal shutdown, output overvoltage, and short-circuit protection.

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 to minimize external component count.
• Supports isolated flyback topology with optocoupler and includes multifunction ZCD pin for zero-current detection.
• Provides comprehensive protection mechanisms including built-in soft-start, hysteretic thermal shutdown, and auto-restart fault handling.

Applications

• Adapters and chargers for consumer electronics
• Battery chargers for portable devices
• General-purpose isolated power supplies

Procurement Notes

Verify the suffix 'H' confirms the 225 kHz frequency limit, distinct from the 'L' type (136 kHz). Confirm the 'TR' suffix indicates tape-and-reel packaging. Ensure the datasheet matches the specific revision for the SO-16 narrow package. Check RoHS compliance status as Ecopack2. Validate that the part is active and not obsolete before finalizing procurement.

Selection Notes

Select this component for designs requiring high input voltage ranges and strict energy-saving standards. The quasi-resonant operation reduces switching losses and EMI compared to fixed-frequency controllers. Consider the 800 V rating for wide-range AC inputs. Evaluate the 22 W power capability against load requirements. The integrated protections simplify design complexity by reducing the need for external safety circuits.

Part Context

The VIPER35HDTR belongs to the VIPerPlus family, which benchmarks low standby consumption. It is part of STMicroelectronics' portfolio of high-voltage converters designed for offline SMPS applications. The H variant specifically denotes the higher switching frequency limit of 225 kHz, optimizing performance for smaller magnetics while maintaining reliability in standard flyback topologies.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult official STMicroelectronics resources or authorized distributors for cross-reference data regarding compatible replacements within the VIPerPlus series or other high-voltage converter families.