UCC28C43PG4

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The UCC28C43PG4 is a high performance circle band gap (CBG)-controlled, second-order, voltage mode switch mode controller for buck dc-dc applications. It is designed for use in a wide variety of industries, including consumer, industrial lighting and automotive markets.

The UCC28C43PG4 offers best-in-class efficiency, while also providing high performance and flexible control. The circuit band gap implementation enables low output voltage ripple, tight voltage regulation and low quiescent current. It also features an adjustable oscillator frequency and enabling of up to 98% efficiency over a wide range of loads.

Features:

• Circuit Band Gap based voltage control for low output voltage ripple, tight voltage regulation and low quiescent current.
• Enable up to 98% efficiency over a wide range of loads.
• Comprehensive, built-in protection features.
• High switching frequency of up to 3 MHz.
• Compatible with ceramic capacitors.
• Processor controlled current mode control and adjustable oscillator frequency.

Applications:

• Pentium® 4 processor power supplies
• Automotive inverter control
• Industrial lighting
• Notebook and PC adapter supplies
• Atom™ platform power supplies

Working Principle:

The UCC28C43PG4 uses a switching-mode power topology controlled by a voltage mode controller. It operates on the principle of an oscillator, which is designed to switch the output MOSFET on and off at a set frequency. During the “on” cycle, current flows through the transistor and into the output capacitor and inductor until the capacitor is charged up to the set voltage. On the “off” cycle, the transistor is disabled and the current continues to flow until the capacitor is fully discharged to the set voltage. The UCC28C43PG4 can be configured with a variety of settings, such as enabling dynamic phase shift and unlocking the power stage at low duty cycles. Additionally, the controller can be configured to operate in either voltage mode or current mode, depending on the application.

The UCC28C43PG4 also features advanced system protection features, such as over-voltage protection, over-temperature protection, under-voltage protection, current limit safety function and an auto-restart mode. These features ensure reliability and safety for the system, preventing any potential damage from occurring.

In conclusion, the UCC28C43PG4 is a powerful, high performance and flexible DC-DC switching controller for buck topology applications. It offers best-in-class efficiency, tight voltage regulation and low quiescent current, as well as comprehensive built-in protection features. The adjustable oscillator frequency and the ability to switch the power stage at low duty cycles make it an ideal solution for a wide range of applications.

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