NJM3774D2

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PMIC (Power Management Integrated Circuits) contains a variety of controllers and driver circuits, each of which is specifically designed for a particular application. Among them, NJM3774D2 is an efficient motor driver circuit with a wide range of potential applications. This article will explore the application field and working principle of NJM3774D2.

NJM3774D2 Application Field

NJM3774D2 is an H-bridged type motor driver IC of the PMIC family, which can be utilized to operate a wide range of motors. Motors that can be operated include DC brush-less motors, mini-motors, coreless motors, geared motors, and mini stepping motors for CD-ROM drives. Such motors are widely used in applications such as computer peripherals, CD-ROM drives and other applications that require precise positioning control.

NJM3774D2 Working Principle

NJM3774D2 motor driver features an H-bridge like structure, which is composed of four N-channel MOSFETs (N: Negative Channel MOSFET) and two bootstrapping capacitors. These N-channel MOSFETs are connected in such a way that in each of the four switching states, any two of the MOSFETs are turned on, which causes current to flow through the motor in one direction or the other. The two bootstrapping capacitors are used to keep the MOSFETs at their optimum operating voltage. Therefore, any two of the MOSFETs can be turned "on" and "off" in the H-bridge structure to control the direction and speed of the motor.

The NJM3774D2 also incorporates a built-in amplifier that enables it to control a wide range of motors. This amplifier can provide a wide range of gain factors that can be used to control the speed and torque of the motor. The gain of the motor can be adjusted according to the user\'s needs. Moreover, the NJM3774D2 can be adjusted by the user to meet different temperature ranges and can operate at temperatures as low as -55°C.

In addition, the NJM3774D2 can be programmed to operate in three different modes: PWM (Pulse Width Modulation) mode, Linear mode, and Position mode. In PWM mode, the motor is operated at different speeds by varying the duty cycle of the signal used to control the motor. In Linear mode, the motor is operated at a constant speed based on the voltage level of the signal used to control the motor. Lastly, in Position mode, the motor is operated to a specific position by using a feedback signal.

Conclusion

NJM3774D2 is a highly efficient motor driver IC that can be used to control a wide range of motors, including DC brush-less motors, Mini-motors, Geared motors and Position motors. It features an H-bridged structure and includes a built-in amplifier, allowing the user to adjust the gain of the motor. In addition, the NJM3774D2 can be programmed to operate in three different modes, making it suitable for a variety of motor control applications. Therefore, the NJM3774D2 is an ideal motor driver IC for applications that require precise control, efficiency and reliability.

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