VIPER115HSTR

Overview

The VIPER115HSTR is an energy-saving offline high voltage converter from the VIPerPlus family, manufactured by STMicroelectronics. It integrates a 800V avalanche-rugged power MOSFET with a PWM current mode controller. The device supports Buck, Buck-Boost, and Flyback topologies with a switching frequency of 120kHz. It operates within a supply voltage range of 4.5V to 30V and features a maximum duty cycle of 80%. Packaged in a 10-SSOP surface-mount case, it delivers up to 12W output power and functions across a junction temperature range of -40°C to 125°C.

Feature Summary

• Integrates an 800V avalanche-rugged power MOSFET for extended input voltage coverage.
• Features embedded high-voltage startup and sense-FET for minimal component count.
• Includes comprehensive protection mechanisms such as thermal shutdown and automatic restart.
• Utilizes jittered switching frequency to reduce electromagnetic interference filter costs.

Applications

• Flyback converter designs
• Buck converter applications
• Buck-Boost converter implementations

Procurement Notes

Verify the specific suffix 'HSTR' corresponds to the tape-and-reel packaging variant when ordering. Confirm that the 120kHz switching frequency aligns with the target EMI requirements. Ensure the 10-SSOP package dimensions fit the PCB layout constraints. Validate that the 800V breakdown rating meets the peak drain voltage stress of the application circuit.

Selection Notes

Select this component for low-power offline AC/DC conversion where high efficiency is required. The integrated 800V MOSFET allows for reduced snubber circuitry compared to lower voltage devices. The jittered frequency feature aids in meeting strict EMI standards without bulky filters. Suitable for designs requiring minimal external components due to embedded startup and control logic.

Part Context

This part belongs to the VIPerPlus series of high-voltage converters. It shares architectural similarities with other members like the VIPER114 and VIPER113, differing primarily in current limit ratings and switching frequencies. The HSTR suffix indicates a reel-packaged version of the HS lead-free variant, designed for automated surface-mount assembly processes.

Replacement Considerations

Direct substitutes within the same family include the VIPER114HS for higher current capability or the VIPER113HS for lower power needs. Cross-family replacements may require topology adjustments. Verify pin compatibility and thermal performance before substituting with non-ST equivalents.