NJM3771FM2

Series:	--
Packaging:	Tube
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Motor Type - Stepper:	Bipolar
Motor Type - AC, DC:	--
Function:	Driver - Fully Integrated, Control and Power Stage
Output Configuration:	Half Bridge (4)
Interface:	Parallel
Technology:	Bipolar
Step Resolution:	1, 1/2
Applications:	General Purpose
Current - Output:	650mA
Voltage - Supply:	4.75 V ~ 5.25 V
Voltage - Load:	10 V ~ 40 V
Operating Temperature:	-20°C ~ 125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	28-LCC (J-Lead)
Supplier Device Package:	28-PLCC (11.51x11.51)

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NJM3771FM2: Motor Drivers, Controllers Application Field and Working PrincipleThe PMIC, NJM3771FM2, is an advanced motor driver and controller from New Japan Radio Company. It is designed to control and drive various types of two-phase, three-phase and four-phase motors. It features a wide voltage range, a variety of current control options, and a range of protections. This makes it particularly suitable for demanding motor control applications.Voltage Range and Current ControlThe NJM3771FM2 is able to drive motors up to 45 volts with a peak current of 10 A. It has three current sensing options: an on-board sense resistor, an external sense resistor and an adjustable zero-crossing detector. The on-board sense resistor allows a user-defined reference current, while the external sense resistor provides a way to set a higher current than the on-board one. The zero-crossing detector takes the motor current at each half cycle, resulting in a smoother current waveform.Protection FeaturesNJM3771FM2 offers various protection features to protect the motors and their components from damage or malfunction. These features include overcurrent protection, overvoltage protection, thermal shutdown, desat protection and junction temperature detection. Overcurrent protection limits the amount of current that flows to the motor at any given time to prevent overheating and damage. Overvoltage protection kicks in when the applied voltage exceeds the rated value of the motor. The thermal shutdown feature shuts off the driver when the temperature reaches a certain level. The desat protection feature prevents the motor driver from saturating the MOSFET. Finally, the junction temperature detection feature monitors the temperature of the motor and shuts it off when it reaches an unsafe level.Control ModeThe NJM3771FM2 offers two control modes: open-loop and closed-loop. The open-loop control mode uses a fixed current reference, while the closed-loop control mode uses a feedback voltage and current reference. In the open-loop control mode, the motor current is adjusted by applying a voltage to the control terminal. In the closed-loop control mode, the motor current is adjusted by applying a voltage to the control terminal and reading the current feedback from the sense resistor.ConclusionThe NJM3771FM2 is an advanced motor driver and controller from New Japan Radio Company. It is designed to control and drive various types of two-phase, three-phase and four-phase motors, and features a wide voltage range and a variety of current control options. It also offers several protection features, including overcurrent protection, overvoltage protection, thermal shutdown, desat protection and junction temperature detection. Finally, it offers two control modes: open-loop and closed-loop.

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