VIPER22AS

Overview

The VIPER22AS-E is a low power off-line SMPS primary switcher from the VIPerPlus family, integrating a dedicated current mode PWM controller with a high voltage power MOSFET on a single silicon chip. It operates at a fixed switching frequency of 60 kHz and supports a wide VDD voltage range from 9 V to 38 V. The device provides overtemperature, overcurrent, and overvoltage protection with auto-restart capabilities. In an SO-8 package, it delivers up to 12 W for European mains (195–265 Vac) and 7 W for US/wide range mains (85–265 Vac).

Feature Summary

• Integrates a high voltage power MOSFET with a current mode PWM controller on one chip.
• Features automatic burst mode operation to minimize power consumption under light load conditions.
• Includes auxiliary undervoltage lockout with hysteresis and a high voltage start-up current source.

Applications

• Off-line power supplies for battery charger adapters
• Standby power supplies for televisions or monitors
• Auxiliary supplies for motor control systems

Procurement Notes

Verify that the ordered part number includes the '-E' suffix to ensure compliance with RoHS standards and confirmation of Ecopack2 packaging. Confirm the specific package variant required, as the base model designation applies to both surface mount SO-8 and through-hole DIP-8 configurations. Ensure the supply chain documentation matches the exact ordering code for the intended packaging type.

Selection Notes

Select this component for designs requiring integrated primary-side regulation in compact form factors. The choice between SO-8 and DIP-8 packages depends on the target PCB assembly technology. Consider the fixed 60 kHz frequency when designing magnetic components. Verify that the application's maximum power requirement aligns with the specific mains voltage range supported by the selected package.

Part Context

This component belongs to the VIPerPlus family of highly integrated offline switchers. It is designed to replace discrete solutions by combining control logic and power switching into a single unit. The series is engineered for cost-effective and space-constrained applications where high reliability and simplified design are prioritized.

Replacement Considerations

Direct substitutes include the VIPER22ADIP-E for through-hole implementations and the VIPER22ASTR-E for tape-and-reel surface mount manufacturing. These variants share identical electrical characteristics and pinouts but differ only in their physical packaging format.

FAQ

How does the VIPER22AS handle overload conditions?

The device incorporates overcurrent, overtemperature, and overvoltage protection mechanisms that utilize an auto-restart function to recover once the fault condition is removed.

What is the purpose of the VDD pin voltage range?

The wide operating range of 9 V to 38 V allows the internal circuitry to accommodate significant variations in auxiliary supply voltages, which is particularly beneficial for battery charger adapter configurations.