Texas Instruments

UCC3803N

UCC3803N Description

The UCC3803N from Texas Instruments is an obsolete but robust transistor driver IC designed for DC-DC switching controllers. It supports multiple topologies, including Buck, Boost, Flyback, and Forward Converters, making it versatile for various power supply designs. Operating within a 3.6V to 12V supply range, it delivers a fixed switching frequency of 31kHz with a high 99% duty cycle capability. Housed in an 8-pin DIP package, this through-hole-mount device is RoHS3 compliant and suitable for industrial environments with an operating temperature range of 0°C to 70°C.

UCC3803N Features

• Output Type: Transistor driver with positive output configuration.
• Wide Input Range: Operates from 3.6V to 12V, accommodating low-voltage applications.
• High Duty Cycle: Supports up to 99% duty cycle for efficient power conversion.
• Multi-Topology Support: Compatible with Buck, Boost, Flyback, and Forward Converters.
• Frequency Control: Fixed 31kHz switching frequency ensures stable performance.
• Robust Packaging: 8-pin DIP (Through Hole) for easy prototyping and legacy designs.
• Compliance: RoHS3 compliant and REACH unaffected, meeting environmental standards.

UCC3803N Applications

The UCC3803N is ideal for:

• Isolated Power Supplies: Flyback and forward converters in industrial systems.
• Low-Power DC-DC Converters: Battery-powered devices requiring efficient voltage regulation.
• LED Drivers: Constant-current applications due to its high duty cycle capability.
• Legacy Systems: Designs requiring through-hole components for maintenance or upgrades.
• Automotive & Industrial Electronics: Where moderate temperature ranges and stable frequency control are critical.

Conclusion of UCC3803N

While obsolete, the UCC3803N remains a reliable choice for engineers working on multi-topology power supplies or legacy systems. Its high duty cycle, wide voltage range, and robust packaging make it suitable for low-to-moderate power applications. For modern designs, TI may recommend newer alternatives, but the UCC3803N's simplicity and performance ensure its continued use in niche and industrial applications.