NCP81111MNI2TXG

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NCP81111MNI2TXG Application Field and Working Principle

NCP81111MNI2TXG, which stands for “Next Generation Intelligent Buck Converter,” is a member of the power management integrated circuit (PMIC) family of voltage regulators. It is specifically a customized regulator for special purpose applications. It is one of the latest and most advanced voltage regulators available in the market today. This article will discuss the application field and working principle of NCP81111MNI2TXG.

Application Field

NCP81111MNI2TXG is designed to support designs with moderate power requirements on a wide input voltage range, particularly those in industrial, automotive and white goods applications that require intelligent system control. It is suitable for high-side and low-side buck topologies. It also supports discontinuous conduction mode operation for higher efficiency at light loads, dynamic phase skip for improved efficiency and light load transient response, as well as pulse frequency modulation to reduce audible noise.

In addition, the NCP81111MNI2TXG also supports spread spectrum clock modulation. This helps reduce electromagnetic interference (EMI) from its circuitry by decreasing the injection of high-frequency energy into the power supply. This can help reduce the amount of filtering required for an EMI compliant design.

NCP81111MNI2TXG is highly integrated, containing an intelligent power controller, two low-side MOSFET drivers and two high-side MOSFET drivers, all in a standard five-pin small-outline integrated circuit (SOIC) package. This allows for a very compact form factor, making it suitable for space-constrained applications.

Working Principle

NCP81111MNI2TXG can operate in either a synchronous Buck or Buck-Boost topology. In both of these configurations, the output voltage is regulated by the internal power controller. This utilizes an inner-built feedback loop to maintain regulation of the output voltage. The power controller then uses a combination of several techniques to maintain regulation, such as voltage loop, peak current mode control, line voltage compensation and temperature compensation.

In addition, the integrated MOSFET drivers in NCP81111MNI2TXG support PWM dimming for applications requiring adjustable output voltage. This dimming capability is accomplished by reducing the duty cycle of the power controller’s output signal. This reduces the amount of energy stored in the inductor, effectively reducing the output voltage.

With the NCP81111MNI2TXG, pre-biased outputs are also supported, allowing the device to switch without an external bootstrap capacitor and the associated PCB routing. This allows for an easier and more cost-effective design, as fewer components are need to implement the switching voltage regulator.

The NCP81111MNI2TXG also supports a pulse frequency modulated (PFM) standby mode, where the output current is controlled by modulating the frequency of the power controller’s output signal. This helps reduce audible noise from the regulator, and increases efficiency during light-load operations. The device can also be enabled directly from an external signal, allowing for advanced power management and system states to be implemented.

Conclusion

The NCP81111MNI2TXG is a next generation intelligent buck converter that caters to a wide range of applications. It is suitable for high-side and low-side buck topologies, as well as discontinuous conduction mode and pulse frequency modulation for improved efficiency during light loads. Additionally, the device supports pre-biased outputs, allowing for a simpler and more cost-effective design. Finally, the NCP81111MNI2TXG features advanced features such as spread spectrum clock modulation, temperature compensation and PFM standby mode which help the design to be more EMI compliant and reduce audible noise. This makes the NCP81111MNI2TXG a great choice for designs requiring moderate power requirements on a wide input voltage range.

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