UC3855ADW

Overview

The UC3855ADW is a high-performance power factor preregulator integrated circuit manufactured by Texas Instruments. It operates within a supply voltage range of 10V to 20V and supports switching frequencies up to 115 kHz. The device features zero-power detection capabilities and draws a startup supply current of 0.3mA with a maximum source current of 14μA. Designed for surface-mount installation, it is housed in a 16-pin SOIC package measuring 10.28mm in length and 2.35mm in height. The component functions reliably across an operating temperature range from 0°C to 70°C.

Feature Summary

• Integrated control logic for high-performance power factor correction applications
• Built-in zero-power detection functionality for efficient operation
• Surface-mount design optimized for compact PCB layouts

Applications

• Power factor pre-regulator circuits
• High-efficiency AC-DC power supplies
• Compliant power management systems

Procurement Notes

Verify the specific suffix 'DW' confirms the SOIC-16 surface-mount package variant rather than through-hole options. Confirm that the device meets RoHS compliance requirements if restricted substances are mandated. Ensure the ordering part number matches the exact manufacturer designation to avoid pinout or electrical specification mismatches during integration.

Selection Notes

Select this component when designing power factor correction stages requiring integrated control without external complex logic. The 16-pin SOIC form factor suits density-constrained designs. Evaluate thermal performance within the 0°C to 70°C operational window against system heat dissipation capabilities before finalizing the architecture.

Part Context

This device belongs to the UC3854/UC3855 family of power factor correction controllers. It shares functional similarities with the UC3854 but offers distinct performance characteristics tailored for specific preregulator topologies. The series is widely recognized for enabling compliant power factor correction in standard switching power supply designs.

Replacement Considerations

Publicly confirmed substitute part numbers for the UC3855ADW are not available in the provided documentation.