VIPER28LN

Overview

The VIPER28LN is an offline high-voltage converter integrating an 800 V rugged power MOSFET with PWM current-mode control. It operates at a fixed frequency of 60 kHz and features jittered frequency to reduce electromagnetic interference. The device includes adjustable extra power timer (EPT) for sustaining overload conditions, dual-level overcurrent protection, output overvoltage protection, and thermal shutdown with hysteresis. It achieves low no-load consumption of 30 mW at 230 V ac and supports automatic restart after fault removal.

Feature Summary

• Integrates 800 V avalanche-rugged power MOSFET with PWM current-mode controller
• Features adjustable extra power timer (EPT) to sustain temporary overload conditions
• Provides comprehensive protection including dual-level OCP, output overvoltage, short-circuit, and thermal shutdown
• Operates in burst mode under light load for ultra-low standby power consumption

Applications

• Printers requiring peak power management
• Audio systems with transient load demands
• General-purpose isolated flyback power supplies
• Cost-effective SMPS designs utilizing minimal external components

Procurement Notes

Verify the specific suffix 'LN' confirms the 60 kHz operating frequency variant when sourcing. Ensure compatibility with application requirements for the integrated 800 V MOSFET voltage rating. Confirm that the design accounts for the EPT function if peak load handling is necessary. Validate input voltage ranges against local grid standards prior to implementation.

Selection Notes

Select this component for applications requiring robust overload tolerance via the Extra Power Timer feature. It is suitable for designs prioritizing minimal component count due to integrated startup and sense FETs. Consider the 60 kHz switching frequency for specific transformer sizing constraints. Evaluate the need for jittered frequency operation to meet EMI regulations effectively.

Part Context

The VIPER28LN belongs to the VIPer28 family of high-voltage converters from STMicroelectronics. This series is designed to meet stringent energy-saving standards through low consumption modes. The LN variant specifically denotes the 60 kHz operating frequency option, distinct from the H type which operates at 115 kHz. It serves as a complete solution for offline power conversion.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.