UCC3818APW

Overview

The UCC3818APW is a BiCMOS power factor preregulator controller designed for average current mode control. It operates within a supply voltage range of 9.7V to 18V and supports switching frequencies from 6kHz to 220kHz. The device features a maximum duty cycle of 99% and includes an internal oscillator with frequency dithering capabilities. It is housed in a 16-pin TSSOP package and functions within an operating temperature range of 0°C to 70°C.

Feature Summary

• Implements average current mode control for high-performance power factor correction
• Integrates frequency dithering to reduce electromagnetic interference (EMI)
• Includes built-in protection mechanisms such as undervoltage lockout and thermal shutdown

Applications

• Power factor correction preregulators for AC-DC converters
• High-efficiency power supplies for computer peripherals
• Telecommunications equipment power systems

Procurement Notes

Verify the specific suffix 'PW' confirms the 16-pin TSSOP package and commercial grade temperature rating. Confirm RoHS compliance status through official manufacturer documentation, as legacy variants may differ. Ensure the source provides valid traceability for this discontinued component type.

Selection Notes

Select this component for designs requiring average current mode PFC control with integrated EMI reduction. Verify that the 16-pin TSSOP footprint matches the PCB layout constraints. Consider the operational temperature limits when designing for enclosed environments.

Part Context

The UCC3818 series belongs to Texas Instruments' portfolio of BiCMOS power factor preregulators. This family focuses on improving efficiency and reducing harmonic distortion in AC-DC conversion stages. The UCC3818APW specifically utilizes the PW package variant for surface-mount applications.

Replacement Considerations

UCC3818PW is the direct equivalent without the A suffix. UCC28180DR is a recommended modern replacement offering enhanced performance and different packaging.