UC3854ADWTR

Overview

The UC3854ADWTR is an enhanced high power factor preregulator controller manufactured by Texas Instruments. It operates within a supply voltage range of 10 V to 20 V, with a nominal input of 18 V. The device supports a switching frequency of up to 200 kHz and functions in current-mode control using pulse width modulation. It is housed in a 16-SOIC package and is rated for operation at temperatures between 0 °C and 70 °C.

Feature Summary

• Implements average current mode control for precise sinusoidal input current shaping
• Integrates a multiplier circuit to generate reference signals proportional to line voltage
• Includes internal oscillator with provisions for external clock synchronization

Applications

• High power factor preregulators for AC-DC power supplies
• Power factor correction circuits in industrial equipment
• Offline switcher applications requiring low harmonic distortion

Procurement Notes

Verify the specific suffix 'DWTR' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the 'A' grade designation meets the necessary thermal and electrical specifications for the intended operating environment before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring active power factor correction with average current mode control. Ensure the design accommodates the 16-SOIC package dimensions and the specified 0 °C to 70 °C operating temperature range. Verify compatibility with the target switching frequency requirements against the internal oscillator capabilities.

Part Context

This part belongs to the UC3854 family of power factor correction controllers from Texas Instruments. It serves as an enhanced version designed to improve performance in preregulator applications compared to earlier iterations. The device is categorized under power management integrated circuits specifically for power factor correction.

Replacement Considerations

The UC3854BDWTR is a documented alternative within the same product family offering similar functionality.