![]() The maximum current requirement is usually set by the torque needed to start up the motor with a mechanical load.īe sure to choose power MOSFETs that are rated for at least the power supply voltage and the maximum current the motor requires. ![]() The drive must be powered from a voltage at least as high as that required to get the desired speed from the motor, but the supply voltage is often determined by the voltage available to the system. You can use the speed constant and torque constant-usually given in a motor’s datasheet-to estimate the voltage and current needed in a particular application. Therefore, the drive may or may not need to be designed to the motor’s full specifications. The required current for the motor depends on the torque applied to the motor. The applied voltage determines the motor speed. Motors usually have given voltage and current ratings, the real operating values may vary from these ratings depending on the application. These parameters are, however, not as simple as one might first think. The two main factors that help define the drive design are the operating voltage and current requirements of the motor. To design a DC motor drive - whether it is for a brush motor or a three-phase brushless motor - the motor characteristics will determine the design details of the drive. ![]() Let’s begin by discussing simple methods to select components for a pre-driver/power MOSFET circuit, and the resulting system performance. Often this process is poorly understood, and implementations are less than optimal. It’s important to account for all the design considerations related to selecting the driver IC, MOSFETs, and in some cases associated passive components. Engineers often use a gate driver or “pre-driver” IC along with N-channel power MOSFETs to provide the high current needed to drive motors.
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