VIPER38HDTR

Overview

The VIPER38HDTR 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 115 kHz with a maximum duty cycle of 80%. The device supports a flyback topology and delivers up to 18 W output power. Input voltage ranges from 8.5 V to 23.5 V, while the integrated MOSFET withstands 800 V. Quiescent current is 3.5 mA. It functions within a temperature range of -40 °C to +150 °C and is housed in a SOIC-Narrow-16 package.

Feature Summary

• Integrates an 800 V avalanche-rugged power MOSFET with embedded high-voltage startup and sense FET for minimal external component count.
• Features dual-level overcurrent protection (OCP) with selectable thresholds to prevent transformer saturation and secondary diode short-circuit damage.
• Includes an adjustable extra power timer (EPT) that blanks overload current for several seconds to sustain temporary overload conditions.
• Operates in burst mode under light load to achieve very low no-load consumption and meets stringent energy-saving standards.

Applications

• Offline flyback converters for metering applications
• General-purpose AC/DC power supplies
• Battery chargers

Procurement Notes

Verify the specific suffix HDTR corresponds to the 115 kHz H-type variant and SOIC-Narrow-16 packaging. Confirm RoHS compliance status via official datasheets. Ensure design accounts for the non-isolated insulation classification if applicable to the system architecture. Validate thermal management requirements given the +150 °C maximum operating temperature rating.

Selection Notes

Select this component for designs requiring peak power capability with fixed-frequency operation. The H-type designation indicates the 115 kHz switching frequency, distinct from the L-type 60 kHz variant. Consider the integrated protections and jittered frequency for EMI reduction. Ensure the application benefits from the low standby consumption and burst mode efficiency characteristics inherent to the VIPerPlus family.

Part Context

The VIPER38HDTR belongs to STMicroelectronics' VIPerPlus family of high-voltage converters. This series is characterized by the integration of an 800 V power MOSFET and PWM controller on a single chip. The family targets energy-efficient offline power supplies, offering features like soft-start, thermal shutdown, and automatic restart to enhance system reliability and reduce printed circuit board footprint.

Replacement Considerations

The VIPER38LDTR serves as a functional substitute within the same family, differing primarily in its 60 kHz operating frequency compared to the 115 kHz frequency of the VIPER38HDTR. Designers must verify transformer specifications and EMI filter components when swapping between these variants due to the frequency change.