The UCC28C43DR is a high-performance, BiCMOS pulse-width modulator (PWM) controller from Texas Instruments, designed for a wide range of power supply applications. This versatile IC is part of the UCC28C4x series, which is well-suited for off-line and DC-to-DC converter applications requiring a high level of performance and reliability.

Key Features

• Low Start-Up Current: The UCC28C43DR is designed with a low start-up current of less than 100µA, which makes it an excellent choice for systems where efficiency is paramount, particularly in battery-operated devices.
• Trimmed Oscillator Discharge Current: This feature ensures consistent and reliable operation of the PWM, providing stable frequency control over temperature and power supply variations.
• Current-Mode Operation: The device offers current-mode control which provides inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation.
• Automatic Feed-Forward Compensation: This helps in maintaining stable operation over a wide range of input voltages and output loads.
• High-Current Totem-Pole Output: The UCC28C43DR features a totem-pole output stage capable of sourcing and sinking high current, which is essential for driving power MOSFETs or IGBTs directly.
• Low Cross-Conduction Current: The design minimizes cross-conduction current, reducing power loss and improving efficiency.

Applications

The UCC28C43DR is ideal for various applications, including:

• Switched Mode Power Supplies (SMPS)
• DC-DC Converters
• Power Supply Modules
• Battery Chargers
• LED Drivers
• AC-DC Adapters

Product Specifications

The UCC28C43DR comes in an 8-pin SOIC package and operates over an industrial temperature range. The PWM controller integrates multiple features for enhanced performance, such as undervoltage lockout, an optimized oscillator for precise frequency control, and a high-current totem-pole output designed to drive capacitive loads like the gate of a power MOSFET directly.

Conclusion

With its robust set of features and capabilities, the UCC28C43DR from Texas Instruments stands out as a suitable PWM controller for engineers looking to design or improve power supply systems. Its combination of low power consumption, high efficiency, and flexible operation make it a go-to solution for a wide range of power management challenges.