Pins 2 and 10 are connected to the

Pins 2 and 10 are connected to the armature of the DC motor, and the current flow direction is controlled through pin 3 to realize the forward and reverse rotation of the motor. The current detection output pin 8 provides a current sampling signal with a typical value of 377ua/a. It can be connected to a resistance to ground, and overcurrent is output through the resistance. The overcurrent threshold set by the internal protection circuit is 10A. When this value is exceeded, the output will be automatically blocked and automatically restored periodically. When the overcurrent lasts for a long time, the overheating protection will turn off the entire output. The overheating signal can also be output through pin 9. When the junction temperature reaches 145 degrees, pin 9 has an output signal. The charge pump circuit is controlled by a 300kHz oscillator, and the capacitor of the charge pump can be charged to about 14V. In this system, a 10uF capacitor is connected to pins 1 and 11 to form a second charge pump circuit. The ideal waveform under unipolar drive is shown in Figure 6-11.