VIPER25HN

Overview

The VIPER25HN is an off-line high voltage converter from the VIPerPlus family, designed for AC/DC conversion with a flyback topology. It features an 800 V rugged power section and operates within an input voltage range of 8.5 V to 23.5 V. The device delivers up to 20 W output power with a maximum output current of 1.5 A. It utilizes a switching frequency of 225 kHz and maintains a low operating supply current of 3.5 mA. The component is housed in a DIP-7 package and supports through-hole installation. It functions as an isolated converter with a single output.

Feature Summary

• Integrates quasi-resonant control for valley switching operation to reduce EMI filter costs
• Includes double levels of overcurrent protection, overvoltage protection, and hysteretic thermal shutdown
• Features safe auto-restart capability after fault condition removal and on-board soft-start
• Supports burst mode operation to achieve standby power consumption below 50 mW at 265 Vac

Applications

• Industrial applications requiring isolated AC/DC conversion
• Switch mode power supplies (SMPS) with low power requirements
• Adapters and chargers meeting standby energy saving regulations

Procurement Notes

Verify the specific suffix HN against official STMicroelectronics documentation to confirm the exact pinout and packaging configuration. Confirm RoHS compliance status via the manufacturer's latest environmental declaration. Check for any Product Change Notifications (PCN) or End-of-Life (EOL) notices that may affect long-term availability. Ensure the selected distributor provides valid traceability documents for quality assurance purposes.

Selection Notes

Select this component when designing flyback converters requiring high voltage ruggedness and integrated protection features. The DIP-7 package suits through-hole designs where space constraints are less critical than ease of assembly. Consider the 225 kHz switching frequency for balancing efficiency and component size. Verify that the 800 V breakdown voltage aligns with the maximum rectified input voltage of the target application.

Part Context

The VIPER25HN belongs to the VIPerPlus family of off-line converters manufactured by STMicroelectronics. This series combines a high-voltage power MOSFET with a PWM controller in a single monolithic IC. The family is characterized by its ability to deliver high performance in compact packages while minimizing external component count. It targets cost-sensitive applications requiring reliable power management solutions.

Replacement Considerations

Consult official substitution lists for verified alternatives. Cross-reference pinouts and electrical parameters carefully before replacing.