VIPER319LDTR

Overview

The VIPER319LDTR is an offline switch from the VIPERPlus family, integrating a high-voltage converter with an 800 V avalanche-rugged power MOSFET and PWM current-mode control. It supports flyback, buck, and buck-boost topologies with a fixed switching frequency of 60 kHz ±7%. The device features integrated HV startup, sense FET, error amplifier, and oscillator with frequency jitter. Drain current limit protection is set at 990 mA. Supply voltage ranges from 4.5 V to 30 V, with breakdown voltage at 800 V and start-up voltage at 8 V. It operates within a junction temperature range of -40°C to 150°C in a 16-SOIC package.

Feature Summary

• Integrates an 800 V avalanche-rugged power MOSFET for extended input voltage range coverage.
• Includes embedded high-voltage startup circuitry and sense FET to minimize external component count.
• Features built-in soft-start and comprehensive protection mechanisms including thermal shutdown and overvoltage.
• Supports multiple converter topologies such as flyback, buck, and buck-boost configurations.

Applications

• General purpose AC-DC converters operating from 85 to 265VAC
• Buck converter implementations for low-power applications
• Offline power supplies requiring high efficiency and low standby consumption

Procurement Notes

Verify the specific suffix 'L' confirms the 60 kHz switching frequency variant when sourcing. Ensure the 'DTR' designation matches the required tape-and-reel packaging format for automated assembly processes. Confirm RoHS3 compliance status if environmental regulations apply to the target market. Cross-reference the 16-SOIC package dimensions against PCB footprint requirements prior to procurement.

Selection Notes

Select this component for designs requiring an integrated solution that reduces bill of materials through embedded startup and control functions. The 990 mA drain current limit suits moderate power applications compared to other variants in the series. Consider the 60 kHz jittered frequency for EMI management in sensitive environments. Evaluate the 800 V breakdown capability against the maximum expected line voltage transients.

Part Context

This part belongs to the VIPER31x family of high-voltage converters manufactured by STMicroelectronics. The family integrates power MOSFETs with PWM controllers to simplify offline power supply design. Variants differ primarily by switching frequency and current limit thresholds. The VIPER319LDTR specifically denotes the 60 kHz frequency type with a 990 mA current limit.

Replacement Considerations

VIPER317LDTR offers similar functionality with a lower drain current limit of 710 mA. VIPER318LDTR provides an intermediate drain current limit of 850 mA. Both share the same 60 kHz switching frequency and pinout compatibility within the VIPER31 family.