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NCP81242MNTXG application field and working principle

Abstract: This paper introduces the application field and working principle of NCP81242MNTXG, which is a voltage regulator chip of PMIC (Power Management Integrated Circuit). It explains how the chip works and its applications.

I. Introduction: The NCP81242MNTXG is a specialized voltage regulator chip designed to provide precisionAdjustable Voltage Control and high efficiency conversion rating in a wide range of applications. It features built-in over-voltage protection, under-voltage protection, and short circuit protection, providing safe operation even in the harshest environments. With a typical efficiency of more than 90% even at light load, NCP81242MNTXG offers a cost-effective solution for power management.

II. Application Field: NCP81242MNTXG is typically used in the following applications:

• Computer motherboards
• LED lighting circuits
• High power industrial equipment
• Battery packs
• Consumer electronics
• Automotive electronics
• Industrial process control and automation

III. Working Principle: NCP81242MNTXG operates based on a two-phase modulation scheme using two floating MOSFETs. The first MOSFET is the primary power switch, whose duty cycle controls the power delivered to the load, and the second MOSFET is the synchronous rectifier, which helps to reduce the input current ripple. A control loop is used to modulate the duty cycle of the primary power switch to maintain the output voltage at a constant, predetermined level. The control loop includes an error amplifier, current comparator, and a logic block for synchronization. The error amplifier compares the output voltage, determined by the feedback voltage, with a reference voltage and adjusts the signal accordingly. The current sense signal then compares the total current consumption with a set limit and faults the system when exceeded. To further improve the load transient response and reduce the output voltage overshoot and undershoot, an output voltage slew rate control can be enabled.

IV. Conclusion: NCP81242MNTXG is a specialized voltage regulator chip designed to provide precision adjustable voltage control and high efficiency conversion rating in a wide range of applications. It features built-in over-voltage protection, under-voltage protection, and short circuit protection, providing safe operation even in the harshest environments. As such, it is a cost-effective solution for power management in applications such as computer motherboards, LED lighting circuits, high power industrial equipment, battery packs, consumer electronics, automotive electronics, and industrial process control and automation.

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