How to Use ponte h TB6612FNG: Examples, Pinouts, and Specs

The TB6612FNG is a dual H-bridge motor driver IC designed for controlling two DC motors or one stepper motor. It supports motor voltage ranges from 2.5V to 13.5V and offers features such as PWM (Pulse Width Modulation) control for speed regulation, direction control, and built-in thermal shutdown protection. This compact and efficient IC is widely used in robotics, automation, and other motor control applications.

• Robotics: Driving wheels or actuators in robotic systems
• Automation: Controlling conveyor belts or small machinery
• DIY Projects: Motorized toys, RC vehicles, and hobbyist electronics
• Stepper Motor Control: Driving stepper motors for precise positioning

The TB6612FNG has 24 pins. Below is a summary of the key pins:

1. Power Connections:

   • Connect the motor power supply (VM) to the motor voltage input pin (Pin 6). Ensure the voltage is within the range of 2.5V to 13.5V.
   • Connect the logic power supply (VCC) to Pin 8. This should be between 2.7V and 5.5V.
   • Connect the GND pin (Pin 7) to the ground of your circuit.

2. Motor Connections:

   • Connect the motor terminals to the output pins (AO1, AO2 for Motor A; BO1, BO2 for Motor B).

3. Control Signals:

   • Use the AIN1, AIN2, and PWMA pins to control Motor A.
   • Use the BIN1, BIN2, and PWMB pins to control Motor B.
   • Apply PWM signals to the PWMA and PWMB pins to control motor speed.
   • Set the STBY pin high to enable the IC.

4. Direction Control:

   • Set AIN1 high and AIN2 low to rotate Motor A in one direction.
   • Set AIN1 low and AIN2 high to rotate Motor A in the opposite direction.
   • Similarly, use BIN1 and BIN2 for Motor B.

5. PWM Control:

   • Apply a PWM signal (up to 100 kHz) to the PWMA or PWMB pins to adjust motor speed.

Below is an example Arduino sketch to control two DC motors using the TB6612FNG:

// Define motor control pins
const int AIN1 = 2;  // Motor A direction pin 1
const int AIN2 = 3;  // Motor A direction pin 2
const int PWMA = 5;  // Motor A PWM pin
const int BIN1 = 4;  // Motor B direction pin 1
const int BIN2 = 7;  // Motor B direction pin 2
const int PWMB = 6;  // Motor B PWM pin
const int STBY = 8;  // Standby pin

void setup() {
  // Set motor control pins as outputs
  pinMode(AIN1, OUTPUT);
  pinMode(AIN2, OUTPUT);
  pinMode(PWMA, OUTPUT);
  pinMode(BIN1, OUTPUT);
  pinMode(BIN2, OUTPUT);
  pinMode(PWMB, OUTPUT);
  pinMode(STBY, OUTPUT);

  // Enable the motor driver
  digitalWrite(STBY, HIGH);
}

void loop() {
  // Motor A: Forward at 50% speed
  digitalWrite(AIN1, HIGH);
  digitalWrite(AIN2, LOW);
  analogWrite(PWMA, 128);  // 50% duty cycle (128 out of 255)

  // Motor B: Reverse at 75% speed
  digitalWrite(BIN1, LOW);
  digitalWrite(BIN2, HIGH);
  analogWrite(PWMB, 192);  // 75% duty cycle (192 out of 255)

  delay(2000);  // Run motors for 2 seconds

  // Stop both motors
  analogWrite(PWMA, 0);
  analogWrite(PWMB, 0);

  delay(2000);  // Wait for 2 seconds
}

• Ensure the motor voltage (VM) matches the requirements of your motors.
• Use appropriate decoupling capacitors near the power supply pins to reduce noise.
• Avoid exceeding the maximum current ratings to prevent damage to the IC.
• Use heat sinks or proper ventilation if operating near the maximum current limits.

1. Motors Not Spinning:

   • Ensure the STBY pin is set high to enable the IC.
   • Verify that the motor power supply (VM) is connected and within the specified range.
   • Check the PWM signal and ensure it is being applied correctly.

2. Motor Spins in the Wrong Direction:

   • Swap the AIN1 and AIN2 signals (or BIN1 and BIN2 for Motor B) to reverse the direction.

3. Overheating:

   • Ensure the current drawn by the motors does not exceed 1.2A per channel.
   • Use a heat sink or improve ventilation around the IC.

4. PWM Control Not Working:

   • Verify the PWM frequency is within the supported range (up to 100 kHz).
   • Check the duty cycle of the PWM signal to ensure proper speed control.

Q: Can I use the TB6612FNG to drive a stepper motor?
A: Yes, the TB6612FNG can drive a stepper motor by controlling the two H-bridges in a coordinated manner. You will need to generate the appropriate step and direction signals.

Q: What happens if the IC overheats?
A: The TB6612FNG has built-in thermal shutdown protection. If it overheats, it will temporarily disable the outputs until the temperature returns to a safe level.

Q: Can I use a single power supply for both VM and VCC?
A: Yes, as long as the voltage is within the range of 2.7V to 5.5V for VCC and 2.5V to 13.5V for VM. However, separate supplies are recommended for better performance.