UCC2800PWTRG4

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Texas Instruments’ UCC2800PWTRG4 device belongs to a family of high-performance Current-Mode PWM controllers and is part of the standard portfolio of power management integrated circuits (PMICs). UCC2800PWTRG4 is used for generating fixed frequency pulse width modulation (PWM) signals for controlling DC/DC switching converters. The UCC2800PWTRG4 operates in current mode, a topology that provides numerous advantages compared to fixed frequency voltage mode switching controllers. It provides a high-efficiency and reliable regulated output current to a resistive load.

Features and Benefits

The UCC2800PWTRG4 device brings together multiple benefits and features that make it well suited for use in DC/DC switching converters. It operates in current mode, ensuring low cycle-by-cycle current stress on the circuitry during abnormal load sequences. The cycle-by-cycle current limit is controlled by a voltage that is externally programmed. In addition, the device features a programmable soft-start time and programmable peak current limit to limit output current during startup. Other features of the UCC2800PWTRG4 include its thermal shutdown protection, an undervoltage lockout circuit, an output overvoltage protection circuit, and peak current limit monitoring.

Applications

The UCC2800PWTRG4 current-mode switching controller is designed for use in wide variety of switching converter topologies and has proven to be a popular choice for a wide range of DC/DC switching applications. The device is ideal for use in a variety of power management solutions, including notebook and desktop computers, telecom and industrial equipment, automotive, and gaming systems. The UCC2800PWTRG4 is an excellent choice for applications that require high efficiency, low RDSon, wide operating range, and fast transient response.

Working Principle

The UCC2800PWTRG4 device operates in current mode. The device is specifically designed for power circuit applications using level-shift switching techniques, such as the popular SEPIC (Single ended Primary Inductor Converter) topology. The UCC2800PWTRG4 works by regulating the output current. A voltage reference, which is programmable via an external resistor, sets the output current limit. As the output current increases, the voltage reference is compared to an amplifier output connected to the external resistor. If the output current exceeds the programmed current limit, the comparator will signal an error to the controller and reduce the duty cycle of the switching signal until the current falls below the set threshold. This cycle then repeats, providing a constant output current to the load.

The UCC2800PWTRG4 also includes a programmable soft-start time which allows the output current to be gradually ramped up over a user-defined period of time. This helps to prevent inrush currents when the circuit is first turned on, ensuring a safe and reliable operation. The peak current limit is also monitored and compared to a pre-programmed threshold to prevent current overloads during a high-demand situation. When the current limit is exceeded, the duty cycle of the switching signal is reduced until it falls below the peak current limit setting.

Conclusion

The UCC2800PWTRG4 current-mode switching controller is a powerful and versatile device for DC/DC switching converter applications. The device brings together multiple features and benefits, including its current mode design, programmable soft-start time, and peak current limit monitoring which ensures reliable and efficient operation. The UCC2800PWTRG4 can be used in many different power management solutions, including notebook and desktop computers, telecom and industrial equipment, automotive, and gaming systems.

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