VIPER28HD

Overview

The VIPER28HD is a high-voltage offline converter from the VIPerPlus family, integrating an 800 V rugged power MOSFET with PWM current-mode control. It operates at a fixed switching frequency of 115 kHz and supports flyback topology. The device features internal HV startup, a sense FET, and an oscillator with jitter to minimize external components. Key electrical parameters include a supply voltage range of 8.5 V to 23.5 V, a maximum duty cycle of 80%, and a breakdown voltage of 800 V. It provides comprehensive protection including dual-level overcurrent protection, output overvoltage, short-circuit, and thermal shutdown with hysteresis.

Feature Summary

• Integrates an 800 V avalanche-rugged power MOSFET for ultra-wide-range input voltage capability.
• Features adjustable extra power timer (EPT) to sustain overload conditions temporarily.
• Includes soft-start functionality to reduce stress during startup and increase IC lifetime.
• Supports automatic restart after fault condition removal for enhanced system reliability.

Applications

• Offline AC/DC converters requiring high voltage integration
• Flyback topology power supplies with isolated outputs
• Designs meeting stringent energy-saving standards with low no-load consumption

Procurement Notes

Verify the specific suffix 'H' indicates the 115 kHz switching frequency variant, distinct from the 'L' type which operates at 60 kHz. Confirm package integrity for the 16-SOIC form factor. Ensure compatibility with RoHS3 compliance requirements. Check datasheet for exact pinout configuration relative to application circuit design. Validate thermal performance specifications against intended operating temperature range.

Selection Notes

Select this component when a fixed 115 kHz frequency is required for EMI filtering characteristics. Choose the VIPER28HD over other VIPerPlus variants if the higher switching frequency aligns with transformer size constraints. Consider the integrated 800 V MOSFET rating for wide-input voltage applications. Evaluate the dual-level OCP thresholds for specific overload protection needs. Compare no-load consumption metrics against regulatory efficiency requirements.

Part Context

The VIPER28HD belongs to the VIPerPlus family of high-voltage converters. This series combines power MOSFET technology with advanced PWM control in a single IC. The family targets cost-effective, compact power supply designs. The HD suffix specifically denotes the high-frequency operation mode within this product line.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify functional equivalence with other VIPerPlus models based on frequency selection (H vs L types). Cross-reference pinouts and protection features before substitution.