VIPER317LDTR

Overview

The VIPER317LDTR is an energy-saving off-line high voltage converter from the VIPER31 series, manufactured by STMicroelectronics. It integrates an 800 V avalanche-rugged power MOSFET with a PWM current-mode controller in a SO-Narrow-16 package. The device supports flyback, buck, and buck-boost topologies with a drain current limit of 710 mA. It operates at a jittered switching frequency of 60 kHz ± 7% to reduce EMI filter costs. The IC features embedded HV startup, a sense FET, and an error amplifier with a 1.2 V reference. Supply voltage ranges from 4.5 V to 30 V, with operation temperatures from -40 °C to +150 °C.

Feature Summary

• Integrates an 800 V avalanche-rugged power MOSFET for extended input voltage range coverage.
• Includes embedded high-voltage startup circuitry and a sense FET to minimize external component count.
• Features a jittered switching frequency to lower electromagnetic interference filter requirements.
• Provides comprehensive protection mechanisms including thermal shutdown, overvoltage, and overload/short-circuit protection.

Applications

• Energy-saving off-line AC/DC converters
• Flyback topology power supplies
• Buck and buck-boost converter designs

Procurement Notes

Verify the specific suffix LDTR indicates tape and reel packaging when ordering. Confirm the 710 mA drain current limit aligns with the target application's peak load requirements. Ensure compatibility with the 60 kHz switching frequency variant within the VIPER31 family. Check RoHS compliance status through official manufacturer documentation prior to integration.

Selection Notes

Select this component for applications requiring ultra-wide AC input voltage ranges supported by the 800 V breakdown rating. Consider the integrated HV startup and sense FET for designs prioritizing minimal bill of materials. Evaluate the 60 kHz jittered frequency option if EMI reduction is a primary design constraint compared to other frequency variants in the series.

Part Context

The VIPER317LDTR belongs to the VIPER31 family of high-voltage converters. This series combines power MOSFET technology with advanced control logic to simplify offline power supply design. The device is part of STMicroelectronics' portfolio aimed at meeting stringent energy-saving standards through low consumption modes.

Replacement Considerations

Official substitutes include VIPER318LDTR (850 mA) and VIPER319LDTR (990 mA) for higher current needs. Lower current options like VIPER316 are available but may not match the 710 mA specification. Verify pinout and thermal characteristics before substitution.