UCC3818APWR

Overview

The UCC3818APWR is a BiCMOS power factor preregulator controller manufactured by Texas Instruments. It operates in average current mode to correct the input power factor of switching power supplies. The device features a wide operating supply voltage range from 9.7V to 18V and supports switching frequencies between 6kHz and 220kHz. It is housed in a 16-pin TSSOP package with an industrial temperature rating of 0°C to 70°C.

Feature Summary

• Implements average current mode control for high-performance power factor correction
• Integrates a high-voltage startup circuit to minimize external component count
• Includes built-in frequency dithering to reduce electromagnetic interference

Applications

• Power factor correction stages in AC-DC adapters
• Input conditioning for offline switching power supplies
• Universal input power supplies for consumer electronics

Procurement Notes

Verify the specific suffix 'PWR' corresponds to the TSSOP-16 package and A-grade temperature range. Confirm RoHS compliance status and moisture sensitivity level prior to ordering. Ensure the supplier provides traceable documentation matching the manufacturer's part identification.

Selection Notes

Select this component when designing systems requiring active power factor correction with average current mode control. It is suitable for applications needing a wide input voltage range and integrated startup functionality. Consider thermal performance within the TSSOP-16 package for the target power density requirements.

Part Context

This part belongs to the UCC3818 family of BiCMOS power factor preregulators. The 'A' designation indicates an extended or automotive-grade temperature range compared to standard variants, while 'PWR' specifies the thin-shrink small-outline package. It serves as a dedicated controller for improving efficiency in offline power conversion.

Replacement Considerations

The UCC3818PW is a pin-compatible alternative in the same family but may differ in package type or grade. Verify functional equivalence and parameter alignment before substitution.