UCC28503DWTR

Overview

The UCC28503DWTR is a BiCMOS Power Factor Correction (PFC) and Pulse Width Modulation (PWM) combined controller manufactured by Texas Instruments. It integrates PFC and PWM control functions into a single device to simplify power supply design. The component operates within an ambient temperature range of -40°C to +85°C and utilizes a 20-pin Small Outline Integrated Circuit (SOIC) surface-mount package. Key electrical specifications include a switching frequency of 200 kHz, a maximum duty cycle of 100 percent, and a quiescent supply current of 150 µA. It supports boost topology for the PFC stage.

Feature Summary

• Integrates both PFC and PWM controllers in a single BiCMOS device
• Supports continuous conduction mode with average current mode control
• Provides high power factor and low total harmonic distortion
• Includes built-in protection features such as overvoltage and undervoltage lockout

Applications

• High-performance AC-DC power supplies
• Computer and notebook adapters
• Telecommunications power systems
• Industrial power supplies

Procurement Notes

Verify the specific ordering suffix DWTR confirms the tape-and-reel packaging format required for automated assembly processes. Confirm that the device meets RoHS compliance standards if environmental regulations apply to the final product. Ensure the SOIC-20 footprint matches the PCB layout constraints. Validate that the operating temperature range aligns with the thermal environment of the target application.

Selection Notes

Select this component when a unified solution for both power factor correction and voltage regulation is required to reduce component count and board space. Consider the 200 kHz switching frequency for balancing efficiency and electromagnetic interference. Evaluate the 150 µA supply current for applications requiring low standby power consumption. Ensure the design accommodates the thermal requirements of the SOIC-20 package under maximum load conditions.

Part Context

This part belongs to the UCC2850x series of combined PFC/PWM controllers from Texas Instruments. These devices are designed to replace discrete solutions, offering a compact alternative for high-efficiency power conversion. The series targets applications demanding strict power quality standards and simplified bill of materials.

FAQ

What control mode does the UCC28503 support?

The UCC28503 supports average current mode control for the power factor correction stage.

Is the UCC28503 suitable for discontinuous conduction mode?

No, the UCC28503 is specifically designed for continuous conduction mode operation.