Texas Instruments

UCC28C45D  

DC DC Switching Controllers

UCC28C45D Description

The UCC28C45D from Texas Instruments is a high-performance current-mode PWM controller designed for DC-DC switching power supplies. Operating within a 7.6V to 18V supply range, it supports switching frequencies up to 1MHz, making it suitable for high-efficiency power conversion. This obsolete but robust IC features a single-output transistor driver with a positive output configuration, optimized for boost, flyback, and forward converter topologies. Its 48% maximum duty cycle and frequency control capabilities ensure precise regulation in demanding applications. Packaged in an 8-SOIC tube, it is RoHS3 compliant and rated for unlimited moisture sensitivity (MSL 1).

UCC28C45D Features

• Current-Mode Control: Enhances loop stability and transient response.
• Wide Input Voltage Range (7.6V–18V): Compatible with diverse power sources.
• High Switching Frequency (1MHz): Enables compact magnetics and higher power density.
• 48% Duty Cycle Limit: Prevents transformer saturation in forward converters.
• Single-Output Driver: Simplified design for non-synchronous rectification topologies.
• Surface-Mount Package (8-SOIC): Space-efficient for modern PCB layouts.
• REACH Unaffected & RoHS3 Compliant: Meets environmental and regulatory standards.

UCC28C45D Applications

Ideal for industrial, telecom, and automotive power systems, the UCC28C45D excels in:

• Isolated Power Supplies: Flyback converters for auxiliary power in grid-tied systems.
• LED Drivers: High-frequency boost converters for constant-current LED arrays.
• AC/DC Adapters: Forward converters with precise voltage regulation.
• Battery-Powered Systems: Efficient step-up (boost) conversion for portable devices.
  Its frequency control feature is particularly advantageous in noise-sensitive environments, allowing EMI optimization.

Conclusion of UCC28C45D

While marked obsolete, the UCC28C45D remains a reliable choice for designers needing a high-frequency, current-mode PWM controller with robust performance in non-synchronous applications. Its versatile topology support, combined with Texas Instruments' proven reliability, makes it suitable for legacy designs or systems requiring stringent duty cycle control. Engineers should evaluate alternative TI offerings for new designs but can leverage this IC’s simplicity and efficiency in existing implementations.

UCC28C45D Documents

Download datasheets and manufacturer documentation for UCC28C45D

Datasheets :

UCC28C40-45, UCC38C40-45      

PCN Obsolescence/ EOL :

EOL Notice 21/Dec/2022      

HTML Datasheet :

UCC28C40-45, UCC38C40-45      

PCN Design/Specification :

Mult Devices Font 21/Apr/2018       UCCx8C4x 18/Nov/2022