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NCP81203PMNTXG Application Field and Working Principle

The NCP81203PMNTXG is a high-efficiency, low-voltage synchronous DC/DC buck converter from ON Semiconductor. This special-purpose converter is designed for automotive battery-operated applications with high efficiency, low voltage and low-power usage.

Application Field

The NCP81203PMNTXG is primarily used in automotive applications that require a high-efficiency, low-voltage, adjustable power supply and/or a low-cost alternative to standard controllers.

The NCP81203PMNTXG can be used in a variety of applications, from providing auxiliary power to accessories to system-level DC/DC converters for 48V or 12V automotive applications.

The NCP81203PMNTXG can be used in a broad range of automotive applications, including automotive battery modules, HVAC systems, headlight control systems, occupant recognition systems, traction inverters, motor controllers, fog lamps, and LED lighting.

Design Advantage

The NCP81203PMNTXG provides a number of design advantages over traditional automotive controllers, such as ultra-fast transient response, adjustable frequency, and high efficiency. It also has an integrated shutdown and thermal shutdown feature, plus a wide input voltage range.

The NCP81203PMNTXG offers a flexible input voltage range from 4.5V to 19.2V, allowing for efficient operation even with a cold battery or excess input voltage.

The integrated shutdown and thermal shutdown features prevent the converter from overloading or damage when in extreme conditions.

The adjustable frequency feature allows for better control and allows for efficient operation at higher switching frequencies.

In addition, the NCP81203PMNTXG has an adjustable output voltage feature, allowing for custom power supplies for different application requirements.

Working Principle

The NCP81203PMNTXG works by switching the current between the input and output at a predetermined frequency, based on the current demand. The switching frequency is typically set to maximize efficiency and reduce switching losses. The switching frequency can also be adjusted according to application requirements.

The NCP81203PMNTXG also has an integrated PWM control loop, which monitors the output voltage and adjusts the switching frequency to maintain the desired output voltage. This loop ensures that the output voltage remains consistent even under changing conditions.

In addition, the NCP81203PMNTXG has a current-mode system, which regulates the output current. This system monitors the current and adjusts the switching frequency and duty cycle to maintain the desired current level.

The NCP81203PMNTXG is a high-efficiency, low-voltage, adjustable DC/DC buck converter that can be used in automotive applications to provide a reliable and efficient power supply.

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