Texas Instruments

UCC3813N-0

UCC3813N-0 Description

The UCC3813N-0 from Texas Instruments is an obsolete but historically significant DC-DC switching controller designed for boost, flyback, and forward converter topologies. Operating within a 6.9V to 12V supply range, this transistor driver delivers a positive output configuration with a fixed switching frequency of 46kHz. Its 99% maximum duty cycle ensures efficient power conversion, while its single-output, single-phase design simplifies implementation in compact power systems. Packaged in an 8-pin DIP (Tube), it is suited for through-hole mounting, offering reliability in industrial and legacy applications.

UCC3813N-0 Features

• Topology Support: Optimized for boost, flyback, and forward converters, providing flexibility in power stage design.
• Frequency Control: Fixed 46kHz switching frequency reduces EMI concerns and simplifies filtering.
• High Duty Cycle: 99% max duty cycle maximizes energy transfer efficiency.
• Robust Supply Range: Operates from 6.9V to 12V, accommodating a variety of input sources.
• Single-Output Driver: Transistor driver output simplifies gate drive requirements for external switches.
• Compliance: ROHS3 and REACH compliant, with MSL 1 (Unlimited) moisture sensitivity for extended shelf life.
• Wide Temperature Range: Operates from 0°C to 70°C, suitable for industrial environments.

UCC3813N-0 Applications

• AC/DC Power Supplies: Ideal for offline flyback converters in legacy power systems.
• LED Drivers: Efficiently drives LED arrays in boost configurations.
• Industrial Power Modules: Used in motor control and automation systems requiring robust duty cycle control.
• Telecom/Networking Equipment: Provides stable voltage conversion in older telecom infrastructure.
• Battery-Powered Systems: Suitable for step-up converters in portable devices with moderate power demands.

Conclusion of UCC3813N-0

While obsolete, the UCC3813N-0 remains a reliable choice for engineers maintaining or designing low-to-moderate power DC-DC systems. Its high duty cycle, fixed-frequency operation, and versatile topology support make it a pragmatic solution for legacy applications. For modern designs, TI’s newer alternatives may offer enhanced features, but the UCC3813N-0’s simplicity and proven performance ensure its continued relevance in specific use cases.