The single chip microcomputer can output DC signal, but its driving ability is also limited, so the single chip microcomputer generally do drive signal, drive large power tube such as Mos tube, to generate large current to drive the motor, and the duty cycle size can be controlled by the drive chip added to the motor uniform voltage to reach the purpose of speed conditioning.
The motor drive mainly uses N-channel MOSFET to build H-bridge drive circuit, H-bridge is a typical DC motor control circuit, because its circuit shape resembles the letter H, so it is called \"H-bridge\".