NCP81143MNTXG

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NCP81143MNTXG Application Field and Working principle

The NCP81143MNTXG is a configurable, low power consumption, and high frequency DC/DC synchronous buck regulator that is offered by ON Semiconductor. It has an operating temperature range of -40°C to +125°C. This voltage regulator is capable of up to 6A output current, and adjustment of output voltage between 0.6V and 12V. The NCP81143MNTXG is integrated with control, enabling and disabling functions, clock synchronization, and a phase lock loop (PLL).

Special Purposes for NCP81143MNTXG Voltage Regulator

The NCP81143MNTXG has multiple special purpose applications for various systems, such as for industrial grade PCs and IoT/power saving applications. This voltage regulator is applicable for powering high-performance logic processors, and also meets multiple requirements of PCI Express architecture by providing superior transient response, light load power consumption, and output automatic compensation. The NCP81143MNTXG is also a suitable voltage regulator for powering FPGA systems, given its capability to precisely adjust output voltage and generate constant current output.

Features and Benefits of NCP81143MNTXG Voltage Regulator

The NCP81143MNTXG voltage regulator provides value and convenience in multiple user functions. It contains a chemical-nitride passivated trench MOSFET die, enabling a preregulating MOSFET for low voltage drops and higher efficiency. Further, the NCP81143MNTXG enables he user to freely adjust fSYS in the range of 200kHz to 2MHz, and minimize the external component count. This voltage regulator is also integrated with an adaptive on-time control algorithm that eliminates the need for manual compensation and thereby saving time. Moreover, using the logic enable function, the power consumed in shutdown mode can be greatly reduced. Additionally, the overvoltage protection and undervoltage protection mechanisms embedded in NCP81143MNTXG provide protection against extremely high and extremely low input supply voltages. It comes in a number of packages to choose from, such as the thermally enhanced TSADJ package.

Working Principle of NCP81143MNTXG Voltage Regulator

The NCP81143MNTXG voltage regulator is built with a synchronous buck regulator architecture that follows a continuous conduction mode of operation. This architecture enables the buck regulator to function with higher efficiency as compared to other regulators. The basic operation of the NCP81143MNTXG follows a forced PWM control, as seen in the diagram below.

In this forced PWM mode, the internal operating frequency is determined by the output voltage and the frequency synchronization pin voltage. When the voltage at the VOUT pin is lower than that of the voltage set at the FREQ/SYNC pin, then the CLK/ON function disables the clock and then inputs and outputs are also automatically disabled. When both the supply voltage and the voltage present at the FREQ/SYNC pin are appropriate to the state of the internal op amp, then the regulators start to oscillate with an adjustable duty cycle. The reference voltage is maintained by the voltage-compensated reference amplifier, and is the output of the internal op amp.The internal switch is composed of a MOSFET with a high-side connected to the input voltage, and low-side connected to the output through an inductor, a diode and output capacitor. When the CLK signal goes high then the switch turns on, and the inductor stores energy, while the diode sinks the current. When the CLK signal goes low then the switch turns off, and the output capacitor maintains the voltage while the diode conducts. The frequency and duty cycle of the PWM remain constant, as long as the load is constant and the supply voltage is not changed.

Conclusion

The NCP81143MNTXG voltage regulator is a powerful and efficient product offered by ON Semiconductor. This voltage regulator serves a wide number of applications, such as powering systems with FPGA, industrial grade PCs and IoT/power saving applications. It is capable of delivering up to 6A output current, and is also equipped with features such as over and under voltage protection, and a chemical-nitride for low voltage drops and higher efficiency. Additionally, the clock synchronization and phase lock loop (PLL) functions of the NCP81143MNTXG enable user-friendly operation. Furthermore, the working principle of this voltage regulator follows the synchronized buck regulator architecture, wherein the internal switch is composed of a MOSFET connected to the inductor, diode and output capacitor, allowing for efficient energy storage and release.

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