UC3855ADWTR

Overview

The UC3855ADWTR is a high-performance power factor correction (PFC) pre-regulator manufactured by Texas Instruments. It utilizes average current mode control to manage boost converters in high-power, high-frequency applications. The device operates within a supply voltage range of 15.5 V to 20 V and features a startup current of 150 μA. It is housed in a 20-SOIC package and supports surface-mount installation. The component is designed for efficient power management with an operating temperature range extending from 0°C to +70°C.

Feature Summary

• Implements average current mode control for precise regulation in PFC boost converters
• Optimized for high-power and high-frequency pre-regulator applications
• Integrated startup circuitry with low initial current consumption

Applications

• High power factor correction pre-regulators
• Boost converter control circuits
• Power management systems requiring average current mode control

Procurement Notes

Verify the specific suffix 'DWTR' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the 20-SOIC footprint matches the target PCB design constraints. Ensure compatibility with the specified 15.5 V to 20 V supply voltage range for the intended application environment.

Selection Notes

Select this component when average current mode control is required for high-efficiency PFC designs. Consider the 20-SOIC package size for board space limitations. Evaluate the 150 μA startup current against system power-up requirements. Verify thermal performance capabilities within the 0°C to +70°C operational range for the specific enclosure conditions.

Part Context

This part belongs to the UC3855 series of power factor correction controllers. It is distinct from other UC-series devices like the UC3854 or UC3845 by its specific focus on average current mode control for boost topologies. The DWTR suffix indicates a specific reel-based packaging variant produced by Texas Instruments for surface-mount technology lines.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.