H-Bridge Driver Board for DC Motor
Last Updated on : 2022-10-26 07:01:20download
The Tuya Sandwich H-bridge driver board is a typical DC motor control board. You can use the board with other control boards to reverse the voltage polarity for the connected load or output ports.
Background information
H-bridge is a typical DC motor control circuit. It is named after H-bridge because its circuit shape looks like the letter H. The four vertical line segments in the letter H consist of four triodes and the motor is in the center of the horizontal line segment.
The Tuya Sandwich H-bridge driver board is equipped with a DC005A round power input and a built-in DC circuit. It provides 5V/1A and 3.3V/1A power to other components.
Key components
| Symbol | Description |
|---|---|
| U1 U2 (SY8121B) | DC-DC voltage reversal chip. 2A output, maximum 18V input, and 1.2 MHz clock frequency. |
I/O ports and function definitions
- CN5: DC005A terminal, which is the DC 12V power input port of the board.
- CN10: Load interface, which is used to connect the DC motor and more.
- CN11: Voltage output interface. When CN4 is short connected, it outputs DC 12V voltage. When CN9 is short connected, it outputs DC 5V voltage.
| I/O port | Description |
|---|---|
| 3V3 | Output 3.3V power |
| 5V | Output 5V power |
| GND | Power ground |
| 12V | Output 12V power |
| PWM1 and PWM2 | These ports control the power polarity of the load interface by using a jumper cap to make CN3 or CN8 short connected. |
Schematic diagram and PCB
Note: PWM1 and PWM2 are initialized as logical low, and cannot be set as logical high at the same time.
Things to note
- The actual voltage of interfaces showed in the 12V silk screen is identical to the external power input.
- The logic levels of PWM1 and PWM2 cannot be set as high at the same time.
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