VIPER25LD

Overview

The VIPER25LD is an off-line high voltage converter from the VIPerPlus family, integrating an 800 V rugged power MOSFET with PWM current mode control. It features quasi-resonant (QR) operation for valley switching to reduce EMI and standby consumption below 50 mW at 265 Vac. The device supports a flyback topology with a fixed switching frequency of 136 kHz. It operates within a supply voltage range of 8.5 V to 23.5 V and delivers up to 20 W output power with a maximum output current of 1.5 A. The component is housed in a SIOC-16 Narrow package and functions across a temperature range of -40 °C to +150 °C.

Feature Summary

• Integrates an 800 V avalanche-rugged power section with embedded high-voltage startup circuitry.
• Employs quasi-resonant control for valley switching to minimize electromagnetic interference and switching losses.
• Includes comprehensive protection mechanisms such as dual-level overcurrent limiting, adjustable overvoltage protection, hysteretic thermal shutdown, and safe auto-restart capabilities.

Applications

• Industrial applications requiring isolated AC/DC conversion
• General-purpose offline power supplies
• Smart grid distribution systems

Procurement Notes

Verify the specific suffix against official STMicroelectronics documentation to confirm pinout compatibility and electrical characteristics. Ensure the ordering code matches the required packaging format, as variations exist between tube and tape-and-reel configurations. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and current production status before finalizing procurement.

Selection Notes

Select this component for designs requiring high input voltage tolerance and low standby power consumption. The integrated 800 V MOSFET simplifies snubber circuit design compared to lower voltage alternatives. Consider the fixed 136 kHz switching frequency when designing magnetic components. Verify that the application requirements align with the single-output capability and the specific thermal management needs of the SIOC-16 package.

Part Context

The VIPER25LD belongs to the VIPerPlus series, which focuses on energy-efficient offline converters. This series is designed to meet stringent global energy-saving standards through burst mode operation and low no-load consumption. The device represents a compact solution for replacing discrete high-voltage switcher designs, offering reduced bill of materials and board space.

Replacement Considerations

Consult official substitution guides for compatible parts within the VIPerPlus family or alternative high-voltage offline converters. Verify functional equivalence regarding pinout, voltage ratings, and thermal performance before implementing any substitute component.