VIPER38LE

Overview

The VIPER38LE is a high-voltage AC/DC converter from the VIPerPlus family, integrating an 800 V rugged power MOSFET with PWM current-mode control. It operates at a fixed frequency of 60 kHz with jittered frequency to reduce EMI. The device supports a flyback topology and delivers up to 18 W output power. It features dual-level overcurrent protection, output overvoltage protection, short-circuit protection, and thermal shutdown with hysteresis. The IC includes an adjustable extra power timer (EPT) for overload sustainment and soft-start functionality. Operating temperature range spans from -40 C to +150 C.

Feature Summary

• Integrates an 800 V avalanche-rugged power MOSFET with embedded high-voltage startup and sense FET
• Features PWM current-mode control with selectable overcurrent thresholds to protect against transformer saturation
• Includes adjustable extra power timer (EPT) to sustain overload conditions for a few seconds
• Provides comprehensive protection including output overvoltage, short-circuit, and thermal shutdown with automatic restart

Applications

• General-purpose isolated flyback converters
• Metering applications requiring low standby consumption
• Wide-range mains input power supplies

Procurement Notes

Verify the specific suffix 'LE' indicates the 60 kHz operating frequency variant within the VIPerPlus family. Confirm package type SDIP-10 matches design requirements. Check RoHS compliance status via official documentation. Ensure availability aligns with production cycle times as stock levels may vary by region.

Selection Notes

Select this component for designs requiring ultra-wide input voltage ranges enabled by the 800 V MOSFET breakdown rating. Choose the L-type variant when a lower switching frequency of 60 kHz is preferred for reduced core losses or EMI filtering simplicity. Consider the integrated protections if system reliability under fault conditions is critical.

Part Context

The VIPER38LE belongs to the VIPerPlus series of offline converters. This family combines high-voltage power MOSFETs with intelligent control logic in a single package. The LE suffix specifically denotes the 60 kHz frequency option, distinguishing it from other variants like the HD or LD types which operate at different frequencies.

Replacement Considerations

Direct substitutes include other VIPER38 variants such as VIPER38HD or VIPER38LD, provided the switching frequency difference (115 kHz vs 60 kHz) is acceptable for the application design.