VIPER25LDTR

Overview

The VIPER25LDTR is an off-line high voltage converter from the VIPerPlus family, integrating a rugged 800 V power MOSFET with PWM current mode control. It operates in quasi-resonant mode to reduce EMI filter costs and standby consumption. Key electrical parameters include a switching frequency of 136 kHz, a maximum output current of 1.5 A, and a typical output power of 20 W. The device supports a supply voltage range of 8.5 V to 23.5 V and features hysteretic thermal shutdown with safe auto-restart. It is housed in a 16-SOIC package.

Feature Summary

• Integrates an 800 V avalanche rugged power section with embedded high voltage start-up circuitry.
• Features quasi-resonant control for valley switching operation to minimize electromagnetic interference.
• Includes comprehensive protection mechanisms such as dual-level overcurrent limiting, adjustable overvoltage protection, and hysteretic thermal shutdown.
• Supports burst mode operation to achieve ultra-low standby power consumption.

Applications

• General-purpose isolated flyback converters
• Industrial applications requiring low standby power
• Adapters and chargers for consumer electronics

Procurement Notes

Verify the specific suffix 'L' against the official STMicroelectronics datasheet to confirm it denotes the tape and reel packaging variant rather than a functional difference. Ensure the ordering part number matches the required quantity increments for reel-based distribution. 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 a compact solution with integrated high-voltage switching capabilities. The quasi-resonant feature makes it suitable for applications where EMI reduction is critical without additional filtering components. Consider the 16-SOIC package constraints for PCB layout and ensure the thermal management strategy aligns with the device's operating temperature range of -40°C to +150°C.

Part Context

The VIPER25LDTR belongs to the VIPerPlus family of off-line converters, which are designed to simplify power supply design by integrating the power switch and controller into a single monolithic IC. This family emphasizes high reliability and energy efficiency, targeting applications that must comply with strict standby power regulations while maintaining cost-effective bill-of-materials through reduced external component counts.

Replacement Considerations

Consult the official STMicroelectronics documentation for direct pin-to-pin replacements within the VIPerPlus series, such as other variants in the VIPER25 lineup. Verify compatibility regarding voltage ratings, current limits, and package dimensions before substituting.