UCC38503DWTR

Overview

The UCC38503DWTR is a BiCMOS PFC/PWM combination controller designed for high-performance power factor correction and voltage regulation. It integrates average current mode control with a 7.5-V reference, over-voltage protection, zero-power detection, peak current limiting, and power limiting functions. The device operates within a supply voltage range of 9 V to 16.5 V and supports switching frequencies up to 200 kHz. It features distinct UVLO thresholds for the PFC stage (10.5 V/10 V) and the PWM stage (6.75 V/3.75 V). Packaged in a 20-pin SOIC (DW) format, it is rated for operation between 0°C and +70°C.

Feature Summary

• Integrates BiCMOS technology for combined PFC and PWM control in a single package
• Provides advanced protection mechanisms including over-voltage, peak current, and power limiting
• Features independent UVLO thresholds for PFC and PWM stages to ensure stable startup and operation
• Supports average current mode control for improved line regulation and transient response

Applications

• High-efficiency power factor correction pre-regulators
• Universal input AC-DC power supplies
• Telecommunications power systems
• Industrial power conversion equipment

Procurement Notes

Verify the specific suffix 'DWTR' corresponds to the tape-and-reel packaging variant when ordering. Confirm that the 20-pin SOIC footprint matches your PCB design constraints. Ensure the operating temperature range of 0°C to +70°C aligns with your system's thermal environment. Cross-reference the datasheet for exact pinout configurations to avoid integration errors during schematic capture and layout.

Selection Notes

Select this component for applications requiring integrated PFC and PWM control without separate controllers. It is suitable for designs needing precise current mode control and robust protection features. Consider the 200 kHz switching frequency limit when designing magnetic components. Evaluate the 150 µA startup current against your input source capabilities. Verify compatibility with your required output voltage and current specifications against the datasheet limits.

Part Context

The UCC38503 belongs to Texas Instruments' family of BiCMOS power management ICs. It complements other controllers like the UC3854 by offering combined functionality. The DWTR designation indicates a reel-packaged version of the DW part number. This series targets efficiency improvements in standard AC-DC conversion architectures through integrated control loops.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult official TI replacement guides or contact manufacturer support for qualified alternatives. Direct pin-to-pin replacements may require verification of electrical parameter compatibility.