How to Use VNH2SP30: Examples, Pinouts, and Specs

The VNH2SP30 is a high-current H-bridge motor driver designed to control DC motors and other inductive loads. It integrates a full-bridge driver with advanced protection features, including overcurrent protection, thermal shutdown, and under-voltage lockout. This component is ideal for applications requiring high power and reliability, such as robotics, industrial automation, and motorized systems.

• Robotics (e.g., controlling wheels or arms)
• Industrial automation systems
• Electric vehicles and carts
• Conveyor belts and motorized platforms
• Remote-controlled vehicles

The VNH2SP30 is a robust motor driver with the following key specifications:

The VNH2SP30 is typically available in a MultiPowerSO-30 package. Below is the pin configuration:

1. Power Supply: Connect the motor power supply (5.5V to 16V) to the VCC pins and ground to the GND pins.
2. Motor Connection: Attach the motor terminals to the OUTA and OUTB pins.
3. Logic Inputs: Use INA and INB to control the direction of the motor. Apply a PWM signal to the PWM pin to control motor speed.
4. Enable Pins: Ensure ENA/DIAG and ENB/DIAG are pulled high to enable the H-bridge. These pins can also be used for diagnostic feedback.
5. Current Sensing: Optionally, connect the CS pin to an ADC pin on a microcontroller to monitor motor current.

• Use appropriate decoupling capacitors (e.g., 100 µF and 0.1 µF) near the VCC pins to stabilize the power supply.
• Ensure adequate heat dissipation, as the VNH2SP30 can generate significant heat under high loads.
• Avoid exceeding the maximum voltage and current ratings to prevent damage.
• Use pull-down resistors on logic input pins to prevent floating states.

Below is an example of how to control a motor using the VNH2SP30 and an Arduino UNO:

// Define pin connections
#define INA 7       // Connect to INA pin of VNH2SP30
#define INB 8       // Connect to INB pin of VNH2SP30
#define PWM 9       // Connect to PWM pin of VNH2SP30
#define ENA_DIAG 10 // Connect to ENA/DIAG pin of VNH2SP30
#define ENB_DIAG 11 // Connect to ENB/DIAG pin of VNH2SP30

void setup() {
  // Set pin modes
  pinMode(INA, OUTPUT);
  pinMode(INB, OUTPUT);
  pinMode(PWM, OUTPUT);
  pinMode(ENA_DIAG, OUTPUT);
  pinMode(ENB_DIAG, OUTPUT);

  // Enable the H-bridge
  digitalWrite(ENA_DIAG, HIGH);
  digitalWrite(ENB_DIAG, HIGH);
}

void loop() {
  // Rotate motor forward
  digitalWrite(INA, HIGH);  // Set INA high
  digitalWrite(INB, LOW);   // Set INB low
  analogWrite(PWM, 128);    // Set PWM to 50% duty cycle (speed control)
  delay(2000);              // Run motor for 2 seconds

  // Rotate motor backward
  digitalWrite(INA, LOW);   // Set INA low
  digitalWrite(INB, HIGH);  // Set INB high
  analogWrite(PWM, 128);    // Set PWM to 50% duty cycle (speed control)
  delay(2000);              // Run motor for 2 seconds

  // Stop motor
  digitalWrite(INA, LOW);   // Set INA low
  digitalWrite(INB, LOW);   // Set INB low
  analogWrite(PWM, 0);      // Set PWM to 0 (stop motor)
  delay(2000);              // Wait for 2 seconds
}

1. Motor Not Spinning

   • Ensure the power supply voltage is within the operating range (5.5V to 16V).
   • Verify that the ENA/DIAG and ENB/DIAG pins are pulled high.
   • Check the logic input signals (INA, INB, and PWM) for proper operation.

2. Overheating

   • Ensure proper heat dissipation using a heatsink or cooling fan.
   • Avoid exceeding the maximum continuous current rating of 30A.

3. Erratic Motor Behavior

   • Check for loose connections or poor solder joints.
   • Use decoupling capacitors to stabilize the power supply.

4. No Current Sense Output

   • Verify that the CS pin is connected to an ADC pin on the microcontroller.
   • Ensure the motor is drawing current; the CS pin outputs a voltage proportional to the current.

Q: Can the VNH2SP30 drive stepper motors?
A: No, the VNH2SP30 is designed for DC motors and other inductive loads. Stepper motors require specialized drivers.

Q: What is the purpose of the CS pin?
A: The CS pin provides a voltage proportional to the motor current, which can be used for monitoring or feedback in closed-loop systems.

Q: Can I use the VNH2SP30 with a 3.3V microcontroller?
A: Yes, the logic inputs (INA, INB, PWM) are compatible with 3.3V and 5V logic levels.

Q: How do I protect the VNH2SP30 from voltage spikes?
A: Use a flyback diode or TVS diode across the motor terminals to suppress voltage spikes caused by inductive loads.