VIPER37HE

Overview

The VIPER37HE is an offline high voltage converter from the VIPerPlus family, designed for fixed frequency flyback applications. It integrates a rugged 800 V avalanche power MOSFET with PWM control and advanced protection features. The device operates at a switching frequency of 115 kHz with a maximum duty cycle of 80%. It supports a wide input voltage range up to 265 V AC and delivers up to 20 W of output power. The unit functions within a junction temperature range of -40°C to 150°C and utilizes a 10-SDIP package.

Feature Summary

• Integrates an 800 V avalanche-rugged power MOSFET enabling ultra-wide range AC input operation
• Includes hysteretic thermal shutdown and safe auto-restart mechanisms following fault conditions
• Features advance frequency jittering to reduce electromagnetic interference filter costs
• Provides dual overcurrent protection levels alongside output overvoltage and brownout protection

Applications

• Isolated auxiliary power supplies for consumer electronics
• Standby power adapters for LCD and plasma televisions
• Auxiliary power units for desktop computers
• LED lighting driver circuits requiring low standby consumption

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors. Confirm package integrity upon receipt as the device uses a 10-SDIP through-hole configuration. Ensure storage conditions comply with moisture sensitivity levels specified in the datasheet. Cross-reference ordering suffixes carefully to match exact electrical specifications. Validate that received parts align with the specific HE variant requirements for your design.

Selection Notes

Select this component for designs requiring fixed frequency operation with integrated high-voltage switching capabilities. The built-in brownout function suits applications experiencing unstable input voltages. Consider the 115 kHz switching frequency for EMI compliance strategies. Evaluate the 20 W power capability against transformer selection constraints. The integrated soft-start feature simplifies inrush current management during startup phases.

Part Context

The VIPER37HE belongs to the VIPerPlus series, which combines a high-performance low-voltage PWM controller chip with an avalanche-rugged power MOSFET in a single package. This integration reduces external component count and board space. The series targets energy-saving regulations through burst mode operation and low standby consumption, making it suitable for modern efficient power supply designs.

Replacement Considerations

Consult official substitution lists for compatible alternatives. Verify pin compatibility and electrical parameter alignment before implementation.