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The drive circuits discussed in this section allow

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Unformatted text preview: section allow the controller to pulse-width modulate the voltage supplied to a BDC motor. In terms of power consumption, this method of speed control is a far more efficient way to vary the speed of a BDC motor compared to traditional analog control methods. Traditional analog control required the addition of an inefficient variable resistance in series with the motor. BDC motors are driven in a variety of ways. In some cases the motor only needs to spin in one direction. Figure 6 and Figure 7 show circuits for driving a BDC motor in one direction. The first is a low-side drive and the second is a high-side drive. The advantage to using the low-side drive is that a FET driver is not typically needed. A FET driver is used to: 2. 3. bring the TTL signal driving a MOSFET to the potential level of the supply voltage, provide enough current to drive the MOSFET(1), and provide level shifting in half-bridge applications. Note: The second point typically does not apply to most PIC® microcontroller applications because PIC MCU I/O pins can source 20 mA. 2010 Microchip Technology Inc. Motor R...
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