NCP81109BMNTXG

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NCP81109BMNTXG is a high-efficiency synchronous DC/DC input voltage buck controller that features a current mode step-down controller with integrated MOSFET drivers. The device includes an on-chip comparator that can be used for system monitoring purposes. It also includes an external voltage reference, voltage sense amplifier, and a high side MOSFET driver. The integrated MOSFET drivers are capable of controlling a wide range of buck converter topologies, including closed loop converters. The device is designed to deliver up to 27.9 V of output voltage at currents up to 10 A.

Application Field

The NCP81109BMNTXG DC/DC controller can be used in a variety of applications such as portable, wireless, communications and industrial products. It is suitable for generating negative output voltages of up to -20 V, and can be used to ensure the accuracy of equipment\'s critical power supply, reduce power consumption, and extend battery life. The device is also suitable for low-voltage DC/DC conversion, such as on-board battery power systems, and power systems with multiple output voltage requirements.

Working Principle

The NCP81109BMNTXG follows a current-mode control architecture. This means that the output voltage is regulated by controlling the conduction time of the power switch. The voltage reference is used to set the target xed output voltage. The current sense amplifier senses the inrush or the current running through the inductor of the converter and the voltage across the inductor and feeds back the information to the comparator. The comparator compares the measured signal to the reference signal and generates an output signal, modulated with the sensed signal. This signal is then fed to the PWM controller, which in turn modulates the gate of the power switch to control its conduction time, thus regulating the output voltage.

The NCP81109BMNTXG also includes an on-chip protection circuit which ensures that the current it draws is always below a pre-set level and resumes normal operations when the fault conditions disappear. This protection circuit includes over-voltage protection, under-voltage protection, over-current protection and short-circuit protection.

In summary, the NCP81109BMNTXG is a high-efficiency synchronous DC/DC input voltage buck controller that features a current mode step-down controller with integrated MOSFET drivers. It is suitable for generating negative output voltages of up to -20 V, and can be used to ensure the accuracy of equipment\'s critical power supply, reduce power consumption, and extend battery life. The device follows a current-mode control architecture, and also includes an on-chip protection circuit which ensures that the current it draws is always below a pre-set level and resumes normal operations when the fault conditions disappear.

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