Product Overview
The 30A High-Current Single-Channel Motor Driver Module is an industrial-grade power solution built around the legendary STMicroelectronics VNH2SP30 automotive H-bridge IC. Designed for applications demanding extreme power in a compact, focused form factor, this single-channel driver delivers the full muscle of the VNH2SP30 without the complexity of a second channel, making it the ideal choice for high-power single-motor applications .
The VNH2SP30 is an automotive-grade fully integrated H-bridge motor driver, originally engineered for demanding environments like power windows, seat adjustment, and HVAC systems in vehicles . It combines a dual monolithic high-side driver and two low-side switches using ST’s proprietary VIPower™ M0 and STripFET™ technologies, integrating intelligent signal/protection circuitry with true power MOSFET performance in a single package .
This module is purpose-built for applications requiring one high-current motor channel: heavy-duty industrial actuators, large-format CNC spindles, electric vehicle auxiliary systems, high-power pumps, industrial conveyor drives, and aerospace mechanisms. With comprehensive diagnostic capabilities, real-time current monitoring, and extensive protection features, it offers both brute force and intelligent control in a compact, single-channel format optimized for ease of integration .
Key Features
-
Single High-Current Channel: Focused single-channel design based on the STMicroelectronics VNH2SP30, providing a dedicated, high-power H-bridge for one DC motor or one bipolar stepper motor (using external stepping logic) .
-
30A Continuous Current Capacity: Delivers a remarkable 30A continuous output current (with proper heatsinking), with an absolute maximum voltage rating of 41V, handling the most demanding industrial loads .
-
Automotive-Grade VNH2SP30 IC: Utilizes a genuine STMicroelectronics VNH2SP30 device, AEC-Q100 qualified for the harsh automotive environment, ensuring unparalleled reliability and longevity in industrial applications .
-
Ultra-Low On-Resistance: Features MOSFETs with typical on-resistance of just 19 mΩ per leg, minimizing power dissipation and maximizing efficiency even at full 30A load .
-
Integrated Current Sensing: Provides a current sense output (CS) proportional to the motor current, allowing real-time monitoring of load conditions, torque control, and stall detection via microcontroller ADC inputs .
-
Comprehensive Diagnostic Feedback: Dedicated DIAG/EN pin provides open-drain bidirectional diagnostic signaling, reporting fault conditions including overtemperature, overcurrent, undervoltage, and overvoltage events .
-
High-Frequency PWM Capability: Supports PWM operation up to 20 kHz, enabling smooth speed control across a wide range of motor types and applications .
-
Extensive Protection Features:
-
Thermal shutdown with automatic recovery
-
Undervoltage and overvoltage shutdown
-
Linear current limiter
-
Cross-conduction protection
-
Protection against loss of ground and loss of VCC
-
Overvoltage clamp
-
Very Low Standby Power Consumption: Consumes minimal power when idle, making it suitable for power-sensitive industrial and battery-backed applications .
-
Simplified Single-Channel Interface: All control, power, and monitoring pins for one channel are clearly laid out, reducing wiring complexity compared to dual-channel boards .
-
Rugged Industrial Design: Built to withstand the rigors of industrial environments, with robust PCB construction and heavy-duty terminals suitable for high-current wiring .
Technical Specifications
Pinout & Interface Guide
The single-channel module presents all necessary pins for complete control and monitoring of one VNH2SP30 IC.
Power Terminals
-
VCC: Main motor power supply input (5.5V-16V). Connect to a high-current power supply capable of delivering 30A+. Use heavy-gauge wiring .
-
GND: Power ground. Must be connected to power supply negative terminal and shared with microcontroller ground.
Motor Outputs
Control Pins
-
INA / INB: Direction control inputs. These pins directly interface with microcontroller GPIO to select motor direction and brake conditions .
-
PWM: Pulse Width Modulation input for speed control. A low level on this pin turns off both low-side switches; a high level turns them on according to INA/INB states . Maximum frequency: 20 kHz .
Diagnostic & Enable Pin
Monitoring Pin
Usage Guide
Important Pre-Operation Requirements
Power Supply Considerations:
-
This module requires a high-current power supply. For full 30A operation, the power supply must be capable of delivering 30A+ .
-
Use appropriately gauged wiring (minimum 10-12 AWG, preferably lower for longer runs) to handle the current without excessive voltage drop or heating.
-
The module operates from 5.5V to 16V (absolute maximum 41V, but operation above 16V requires careful thermal management and is not recommended for continuous use) .
Thermal Management:
-
At 30A continuous current, the VNH2SP30 IC will generate significant heat. Adequate heatsinking is mandatory for sustained high-current operation .
-
The MultiPowerSO-30 package is designed for enhanced thermal performance via exposed die pads—ensure your module’s PCB design takes advantage of this with proper thermal vias and/or an attached heatsink .
-
For extreme high-demand applications, forced-air cooling (a fan) may be necessary .
Pull-Up Resistors:
Control Logic Table
Current Sensing Application
The CS pin provides real-time current feedback that can be used for:
-
Overcurrent Protection: Monitor current and shut down PWM or trigger enable pin if threshold exceeded.
-
Stall Detection: Detect motor stalls by monitoring sudden current spikes.
-
Torque Control: Implement closed-loop torque control by regulating current.
-
Load Monitoring: Track mechanical load variations in real-time.
Typical current sense circuit: Connect CS pin to microcontroller ADC through an appropriate resistor to convert output current to voltage. Refer to the VNH2SP30 datasheet for precise transfer characteristics (K factor) .
Diagnostic Monitoring
The DIAG/EN pin provides valuable fault information:
-
In normal operation, this pin remains high (due to pull-up resistor).
-
During a fault (thermal shutdown, overcurrent, etc.), the IC pulls the pin low.
-
The microcontroller can monitor this pin as an interrupt to trigger emergency shutdown or fault handling routines .
Typical Wiring Diagram (Arduino + High-Power DC Motor)
Basic Arduino Example Sketch
#define INA 7
#define INB 8
#define PWM 9
#define DIAG 2
#define CS A0
void setup() {
pinMode(INA, OUTPUT);
pinMode(INB, OUTPUT);
pinMode(PWM, OUTPUT);
pinMode(DIAG, INPUT_PULLUP);
Serial.begin(9600);
attachInterrupt(digitalPinToInterrupt(DIAG), faultHandler, FALLING);
}
void loop() {
digitalWrite(INA, HIGH);
digitalWrite(INB, LOW);
analogWrite(PWM, 191);
int currentRaw = analogRead(CS);
float current = currentRaw * (5.0 / 1023.0);
Serial.print("Current: ");
Serial.println(current);
delay(3000);
digitalWrite(INA, LOW);
digitalWrite(INB, HIGH);
analogWrite(PWM, 127);
delay(3000);
digitalWrite(PWM, LOW);
delay(1000);
digitalWrite(INA, HIGH);
digitalWrite(INB, HIGH);
analogWrite(PWM, 255);
delay(1000);
}
void faultHandler() {
digitalWrite(PWM, LOW);
digitalWrite(INA, LOW);
digitalWrite(INB, LOW);
Serial.println("FAULT DETECTED! Motor stopped.");
}
Q: What is the difference between this single-channel module and the dual-channel VNH2SP30 module?
The single-channel module contains one VNH2SP30 IC and is designed for applications requiring a single high-power motor channel. The dual-channel module contains two VNH2SP30 ICs for controlling two independent motors. This single-channel version offers a more compact, cost-effective solution when you only need one channel .
Q: Can this module really handle 30A continuously?
Yes, the VNH2SP30 IC is rated for 30A continuous output current . However, this requires proper thermal management:
-
Adequate heatsinking attached to the IC’s thermal pad
-
Good airflow around the module
-
PCB design that facilitates heat dissipation
-
Operation within the specified voltage range
Without proper cooling, the thermal protection will activate, reducing or shutting down output.
Q: What types of motors can I control with this module?
This module is designed for:
-
High-power brushed DC motors (one) up to 30A
-
Large bipolar stepper motors (one) using external stepping logic (requires two modules or dual-channel version for full stepper control)
-
High-current inductive loads such as solenoids, valves, and actuators
For stepper motor applications, you will need two modules (one for each coil) or our dual-channel version.
Q: What is the maximum voltage I can apply?
The VNH2SP30 has an absolute maximum rating of 41V . However, the recommended operating range for automotive applications is 5.5V to 16V . Operation above 16V is possible but requires careful thermal management and is not recommended for continuous duty without consulting the datasheet and adequate heatsinking.
Q: Can I use this module with 24V industrial systems?
The VNH2SP30 is optimized for 12V-16V automotive applications. While it can tolerate up to 41V, sustained 24V operation may push the IC beyond its optimal design parameters. For true 24V industrial applications, consider drivers specifically rated for 24V continuous operation.
Q: What power supply do I need for full 30A operation?
For single-channel 30A operation:
-
Power supply rating: Minimum 12V-16V at 30A+ (360W+)
-
Wiring: Minimum 10-12 AWG wire for power connections (lower gauge for longer runs)
-
Battery: High-discharge battery (LiPo, LiFePO4, or lead-acid deep cycle) or industrial-grade power supply
-
Protection: Heavy-duty fuse or circuit breaker (35-40A recommended)
Q: What gauge wire should I use for 30A connections?
For 30A continuous current:
-
Power input and motor outputs: Minimum 10-12 AWG stranded copper wire (10 AWG recommended for safety margin)
-
Keep power wires as short as possible to minimize voltage drop and electromagnetic interference
-
Signal wires (INA, INB, PWM, DIAG, CS): 22-24 AWG is sufficient
Q: Why does the DIAG/EN pin need a pull-up resistor?
This pin is an open-drain output, meaning it can only pull the line LOW, not drive it HIGH . An external pull-up resistor (typically 10kΩ to 5V) is required to maintain a HIGH signal during normal operation. When a fault occurs, the IC pulls this pin LOW, which can be detected by the microcontroller. You can use the Arduino’s internal INPUT_PULLUP function as shown in the example.
Q: What protection features does the VNH2SP30 include?
The VNH2SP30 includes comprehensive protection:
-
Thermal shutdown: Prevents damage from overheating (automatic recovery when temperature drops)
-
Undervoltage shutdown: Prevents operation at unsafe low voltages
-
Overvoltage shutdown/clamp: Protects against supply voltage spikes
-
Linear current limiter: Limits current during overload conditions
-
Cross-conduction protection: Prevents shoot-through current
-
Loss of ground/VCC protection: Maintains safe state if ground or supply is lost
Q: How do I use the diagnostic feature?
Connect the DIAG/EN pin to a microcontroller input with an external pull-up resistor to 5V (or use internal pull-up). In your code, monitor this pin:
You can also use this pin as an interrupt to trigger immediate shutdown routines, as shown in the example sketch .
Q: How accurate is the current sensing?
The CS pin provides a current proportional to the motor current . The exact transfer ratio (K factor) is specified in the VNH2SP30 datasheet (typically around 0.12-0.15% of load current). This output is suitable for:
-
Monitoring relative load changes
-
Detecting stalls (sudden current increase)
-
Implementing basic current limiting
-
Closed-loop torque control
For precision current measurement, calibration against a known reference is recommended.
Q: The module gets extremely hot. Is this normal?
At 30A continuous current, the channel dissipates significant power (P = I²R). With 19mΩ resistance, power loss ≈ I² × 0.019 = 17 watts . This heat must be dissipated. The IC will become hot (60-80°C) under full load. If it becomes too hot to touch (>70°C) and thermal shutdown activates, you need:
Q: The motor runs weakly or stalls under load. What's wrong?
Check:
-
Power supply voltage sag: Measure VCC under load; it should remain above minimum operating voltage
-
Power supply current capability: Ensure supply can deliver required current
-
Wiring voltage drop: Thicker wires needed for 30A
-
Thermal shutdown: If module is hot, it may be cycling in and out of thermal protection
-
PWM frequency: Ensure it’s within 20kHz limit
Q: The motor runs in only one direction.
Verify:
-
INA and INB are receiving opposite logic states (HIGH/LOW or LOW/HIGH)
-
Both control signals are reaching the pins (check wiring)
-
The module isn’t in brake mode (both INA and INB same state)
-
The DIAG/EN pin is HIGH (enabled) and not indicating a fault
Q: What happens if I exceed 41V?
Exceeding the absolute maximum voltage of 41V will likely destroy the VNH2SP30 IC immediately . Always ensure your power supply is regulated and within specifications, with appropriate transient protection.
Q: Can I use two of these single-channel modules to control a stepper motor?
Yes, absolutely. For bipolar stepper motor control, you need two H-bridges—one for each coil. Two of these single-channel modules, properly synchronized via your microcontroller, can drive a large stepper motor with the full 30A per coil capability .
Q: Is this module suitable for an electric vehicle conversion?
For 12V-16V auxiliary motors (power steering pumps, cooling fans, etc.), yes. For main traction motors, most EVs use higher voltages (48V-400V) and brushless motors requiring different controller types. This module is ideal for high-power 12V auxiliary systems.
Q: Can I use this for a large CNC spindle motor?
For brushed DC spindle motors within the voltage and current ratings, yes. The 20kHz PWM frequency and current sensing make it suitable for speed and torque control. For brushless spindles, a dedicated VFD or BLDC controller is required.
Q: Is this suitable for industrial automation (PLCs, factory equipment)?
Yes. The automotive-grade construction, comprehensive protection features, and diagnostic capabilities make it excellent for industrial applications. The 5V logic compatibility allows direct interface with industrial controllers .
Q: Can I use the current sense for closed-loop speed control?
Yes. By monitoring the CS pin, you can implement:
-
Torque control (constant current)
-
Current limiting (reduce PWM if current exceeds threshold)
-
Stall detection and recovery
-
Load monitoring and adaptive control
For true closed-loop speed control, you would also need encoder or tachometer feedback.
