VIPER318LDTR

Overview

The VIPER318LDTR is an offline switch from the VIPerPlus family, integrating an 800 V avalanche-rugged power MOSFET with PWM current-mode control. It supports flyback, buck, and buck-boost topologies with a fixed 60 kHz switching frequency featuring jittering to reduce EMI. The device operates within a supply voltage range of 4.5 V to 30 V and includes built-in soft-start. Key protection features include overload/short-circuit, thermal shutdown, overvoltage, and undervoltage disable. The component is housed in a 16-SOIC package.

Feature Summary

• Integrates an 800 V avalanche-rugged power MOSFET for extended input voltage range capability.
• Features a jittered 60 kHz switching frequency to minimize electromagnetic interference filter costs.
• Includes embedded high-voltage startup circuitry and sense FET to reduce external component count.
• Provides comprehensive protection mechanisms including thermal shutdown and programmable overvoltage/undervoltage thresholds.

Applications

• General purpose isolated flyback converters
• Stand-by power supplies for consumer electronics
• Battery chargers

Procurement Notes

Verify the specific suffix 'LDTR' corresponds to the 16-SOIC package and tape-and-reel delivery format. Confirm that the 60 kHz jittered frequency variant matches the design requirements for EMI compliance. Ensure compatibility with the intended flyback transformer specifications and input voltage ranges before finalizing procurement orders.

Selection Notes

Select this component when designing AC-DC converters requiring high voltage ruggedness and low standby consumption. The integrated 800 V MOSFET allows for wider input voltage ranges compared to lower-rated devices. The fixed 60 kHz frequency with jittering is suitable for applications needing reduced EMI filtering complexity. Consider the 16-SOIC package constraints for thermal management and PCB layout.

Part Context

The VIPER318LDTR belongs to the VIPerPlus family of high-voltage converters from STMicroelectronics. This series combines a power MOSFET with a current-mode controller to simplify offline power supply designs. The VIPER31 sub-series specifically offers varying drain current limits, with the VIPER318 providing an 850 mA limit. The family is designed to meet stringent energy-saving standards through low no-load consumption.

Replacement Considerations

The VIPER317LDTR and VIPER319LDTR are direct functional substitutes within the same family, differing primarily in drain current limits (710 mA and 990 mA respectively). These parts share identical pinouts, packages, and core features, allowing for potential interchangeability based on specific current requirements.