Design of high-power DC motor driver board based on BTN8960

#### BTN7971B
1. **Maximum output current 43A**, working voltage range 5~40V
2. Can control the forward and reverse rotation and speed of the motor
3. With over-temperature protection, when the chip temperature is greater than 150℃, it will automatically Turn off the output to avoid chip damage
4. It has over-current protection. When the output current exceeds the rated current, the chip will automatically turn off the output to protect the motor and chip from damage.
5. Low-level failure protection. When the control signal is lost or low-level, BTN7971B will automatically turn off the output to prevent the motor from running out of control.
6. Automatic power adjustment can automatically adjust the output power according to load conditions to improve system efficiency.
#### BTN8984
1. **Maximum output current 8A**, operating voltage range 5~40V
2. Can control the forward and reverse rotation and speed of the motor, and control the output current and motor speed by controlling the duty cycle of the PWM signal.
3. With over-temperature protection, over-current protection, and low-level failure protection
#### BTN7930
input voltage: 4.5~40V, output current 3.5A
#### BTN7960
voltage: 4.5~46V, output current 5A
#### BTN8960
voltage: 4.5~36V, output current 3.5A
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When designing the high-power DC motor driver board using the isolation chip 74LVC245, since the current and voltage of the motor are relatively large, if the PWM input signal is directly driven by a microcontroller, etc. The chip output may cause interference and reverse current of the input signal, thus affecting the stability and reliability of the circuit. Therefore, in order to prevent this situation from happening, the isolation chip 74LV245 can be used to isolate the PWM input signal. 74LV245 is a bidirectional bus driver. It has the function of isolating input and output ports, which can prevent input signal interference and reverse current from affecting the driver chip. It can also protect the driver chip from the influence of motor voltage and current. In addition, the use of isolation chips can also achieve signal isolation, protect driver chips such as microcontrollers from the influence of motor voltage and current, and improve the stability and reliability of the circuit.
1. Supports the power supply voltage range of 1.65V~5.5V and is compatible with 3.3V or 5V logic levels.
2. Bidirectional transmission: The chip can transmit data in both directions and can be used as an input or output bus driver.
3. High bandwidth: The chip supports high-speed data transmission, with a maximum transmission rate of 400Mbps.
4. Low power consumption: The chip has very low quiescent current and relatively low power consumption, making it suitable for use in low-power applications.
5. Isolation function: The chip has a built-in isolation circuit that can isolate the input and output ports to prevent signal interference and reverse current.
6. Low input and output levels: The input and output levels of this chip are very low, which can adapt to low-level circuits and prevent the level of the input and output ports from being higher than the power supply voltage of the chip itself.
7. Internal limiting resistor: The chip's output port has built-in resistors to prevent excessive current from flowing into the chip.
Pin 1(DIR) Direction control. When high, the signal propagates from A to B. When low, the signal propagates from B to A.
Pin 19(OE#) Output enable