Product Overview
The DHB-1A Dual Channel H-Bridge Motor Driver is a high-current, high-performance motor control module designed for demanding robotics and industrial applications. Unlike standard motor drivers that struggle with high starting currents, this robust module features ultra-low resistance MOSFETs capable of handling continuous currents up to 30A per channel with peak surge capacity of 50A, making it one of the most powerful compact H-bridge drivers available .
This advanced driver board serves as the ideal interface between your microcontroller (Arduino, STM32, Raspberry Pi, PLC) and high-power DC motors, coreless motors, electromagnetic coils, or even Peltier thermoelectric modules (TEC). It provides complete bidirectional control with reversible direction and PWM speed control, while incorporating sophisticated features like current sampling feedback for implementing precision closed-loop control systems .
Whether you are building heavy-duty robotic platforms, electric vehicle prototypes, industrial automation equipment, or high-performance competition robots, the DHB-1A delivers the power handling, switching speed, and thermal efficiency required for reliable operation under extreme loads.
Key Features
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Ultra-High Current Capacity: Delivers 0-30A continuous current per channel with 50A peak surge capacity, enabling control of high-torque motors, large actuators, and high-power inductive loads that would destroy standard drivers .
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Dual Independent H-Bridge Channels: Two fully independent H-bridges allow simultaneous control of two DC motors (with independent direction and speed) or one bipolar stepper motor with high holding torque.
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Ultra-Low On-Resistance: Features MOSFETs with internal resistance as low as 3-12mΩ per channel, resulting in minimal heat generation and exceptional power efficiency even at maximum current loads .
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High-Speed Switching Design: Engineered for rapid switching with impedance load capability up to 200kHz, making it ideal for coreless motors requiring 60-80kHz PWM frequencies and high-performance applications demanding fast response times .
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Integrated Current Sampling: Unique CT (Current Transformer) pin provides real-time analog voltage output proportional to motor current, calculated as Vout = Current(A) × 0.155. This enables precise current monitoring, overcurrent protection, and closed-loop torque/speed control via microcontroller ADC inputs .
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Wide PWM Frequency Range: Supports adjustable PWM frequencies from 500Hz to 80kHz, with optimized settings for different load types:
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Broad Logic Compatibility: Input voltage levels accept Low: 0-0.5V and High: 2.5V-13V, making the module directly compatible with 3.3V, 5V, and 12V logic systems without level shifters .
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Comprehensive Protection Features: Includes brake function for rapid motor stopping, built-in flyback diodes, and robust PCB design capable of withstanding current overloads and voltage transients .
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Integrated Heat Sink: Comes with a dedicated heat sink to ensure reliable operation during extended high-current operation, improving long-term durability .
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Compact High-Power Design: Packs 30A per channel capability into a compact form factor (approx. 62mm × 53mm), enabling high power density for space-constrained applications .
Technical Specifications
Pinout & Interface Guide
Power Terminals
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VCC (+5-12V): Main motor power supply input. Connect a 5V-12V DC power source capable of delivering the required current (up to 30A continuous per channel). Do not exceed 14.6V absolute maximum .
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GND: Power ground. Must be connected to power supply negative terminal and shared with microcontroller ground for proper signal reference.
Motor Outputs
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OUT1, OUT2: Outputs for first DC motor (Motor A) or one coil of stepper motor. Polarity determines initial rotation direction.
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OUT3, OUT4: Outputs for second DC motor (Motor B) or second coil of stepper motor.
Control Signal Pins
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IN1, IN2: Direction control inputs for Motor A. Standard H-bridge logic.
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IN3, IN4: Direction control inputs for Motor B.
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PWM A / PWM B: Dedicated PWM input pins for speed control of each channel (pin labeling may vary by manufacturer; refer to board silkscreen).
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ENA / ENB: Enable pins for each channel (may be present on some variants).
Feedback & Monitoring
Usage Guide
Control Logic Table (DC Motor Operation)
(Same logic applies to Motor B using IN3, IN4, and PWM B)
Current Sampling Application
The CT pin provides real-time current feedback that can be used for:
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Overcurrent Protection: Monitor current and shut down PWM if threshold exceeded
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Stall Detection: Detect motor stalls by monitoring current spikes
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Torque Control: Implement closed-loop torque control
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Load Monitoring: Track mechanical load variations
Formula: ADC Voltage = Motor Current (Amps) × 0.155
Example: 10A motor current produces 10 × 0.155 = 1.55V at CT pin .
PWM Frequency Selection Guide
Select optimal PWM frequency based on your load type:
Typical Wiring Diagram (Arduino + High-Current 12V Motors)
Q: What is the difference between DHB-1A and standard L298N motor drivers?
The DHB-1A is in a completely different performance class:
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Current Capacity: L298N: 2A continuous; DHB-1A: 30A continuous, 50A peak
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Technology: L298N uses bipolar transistors with ~2V drop; DHB-1A uses MOSFETs with 12mΩ resistance for minimal losses
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Feedback: DHB-1A includes current sampling output; L298N has no feedback capability
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Switching Speed: DHB-1A supports up to 80kHz PWM; L298N limited to low frequencies
Q: Can this driver really handle 50A peak current?
Yes, the MOSFETs are designed to withstand transient peak currents up to 50A. However, this is for peak surge conditions only (motor startup, sudden loads). Continuous operation should not exceed 30A per channel, and proper heat sinking with adequate airflow is essential for sustained high-current operation
Q: What types of loads can I control with the DHB-1A?
This versatile driver can control:
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Brushed DC motors (two) up to 30A continuous each
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Bipolar stepper motors (one) using both channels
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Coreless DC motors requiring high-frequency PWM
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Electromagnetic coils and solenoids
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Peltier thermoelectric modules (TEC) for heating/cooling
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High-power LED lighting (with appropriate current limiting)
Q: Is this driver suitable for 24V motors?
No. The maximum supply voltage is 12V DC (14.6V absolute maximum) . Operating at 24V will instantly destroy the module. For 24V applications, consider our high-voltage driver series.
Q: Can I use this with 3.3V microcontrollers like ESP32 or Raspberry Pi Pico?
Yes. The input logic high threshold is just 2.5V, making it fully compatible with 3.3V logic without any level shifters
Q: What power supply do I need for 30A operation?
For full 30A per channel operation (60A total), you need:
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Power supply rating: Minimum 12V at 60A+ (720W+)
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Wiring: Minimum 6 AWG wire for power connections
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Battery: Multiple high-discharge batteries in parallel (LiPo, LiFePO4, or lead-acid deep cycle)
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Fusing: 40-50A fuses on each channel output, 70A+ on main input
Q: Why are there two different current ratings (30A continuous, 50A peak)?
DC motors draw significantly higher current during startup (inrush current) than during normal operation. The 50A peak rating ensures the driver can handle these startup surges without failure. However, sustained operation should remain within the 30A continuous rating to prevent thermal damage
Q: The datasheet mentions 12mΩ resistance. Why does this matter?
Lower resistance means less power wasted as heat. At 30A, power loss = I²R = (30)² × 0.012 = 10.8 watts per channel. This is remarkably efficient for this current level. Standard L298N drivers would waste 60+ watts at similar currents, requiring massive heatsinks
Q: What gauge wire should I use for 30A connections?
For 30A continuous current:
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Power input and motor outputs: Minimum 10-12 AWG stranded copper wire
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Signal wires (IN1-4, PWM): 22-24 AWG is sufficient
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Keep power wires as short as possible to minimize voltage drop and electromagnetic interference
Q: What is the accuracy of the current sampling?
The current sampling provides a linear analog representation suitable for monitoring and protection. For precision measurements, calibrate against a known current source, as component tolerances may cause slight variations (±5-10% typical)
Q: Can I implement overcurrent shutdown using the CT pin?
Yes. Continuously monitor the CT pin in your code. If current exceeds a safe threshold (e.g., 30A continuous), you can immediately set PWM to 0% and set both IN pins LOW to brake, protecting both the driver and motor.
Q: The module gets warm during operation. Is this normal?
Some warmth is normal. At 30A continuous, each channel dissipates approximately 10-11 watts. The included heat sink is designed to handle this, but will become warm to hot (50-60°C) under full load. Ensure adequate airflow. If it becomes too hot to touch (>70°C), reduce load or improve cooling
Q: What PWM frequency should I use for my application?
Follow these guidelines:
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Standard DC motors: 16kHz (balances efficiency and audible noise)
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Coreless motors: 80kHz (required for proper operation)
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Quiet operation: Higher frequencies (>20kHz) to move switching noise beyond human hearing
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Maximum efficiency: Lower frequencies (but may cause audible whine)
Q: My motors run weakly or stall under load. What's wrong?
Check:
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Power supply voltage sag: Measure VCC under load; it should remain above 5V
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Power supply current capability: Ensure supply can deliver required current
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Wiring voltage drop: Thicker wires needed for 30A
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PWM frequency: Incorrect frequency (especially for coreless motors) can reduce torque
Q: The motor runs in only one direction.
Verify:
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IN1 and IN2 are receiving opposite logic states (HIGH/LOW or LOW/HIGH)
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Both control signals are reaching the pins (check wiring)
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The module isn’t in brake mode (both IN pins same state)
Q: Can I parallel both channels to drive a single higher-current motor?
Not recommended. Paralleling H-bridge outputs can cause cross-conduction, shoot-through currents, and module destruction unless the design specifically supports it. This module is not designed for paralleled operation.
Q: What happens if I exceed 14.6V?
Exceeding the absolute maximum voltage of 14.6V will likely destroy the MOSFETs and control circuitry immediately. Always ensure your power supply is regulated and within specifications
Q: Can this driver control a Peltier thermoelectric cooler (TEC)?
Yes. The DHB-1A is excellent for TEC control, supporting the 500Hz-80kHz frequency range ideal for thermoelectric modules. The current sampling feature is particularly useful for maintaining constant cooling power
Q: Is this suitable for a combat robot (battle bot)?
Yes, ideal for combat robotics. The high peak current capacity (50A) handles the stall conditions common in robot combat, and the rugged design can withstand the electrical stress. The integrated heat sink and brake function are valuable features for this application.
Q: Can I use this for regenerative braking?
The module supports active braking (both IN pins HIGH or both LOW) which rapidly shorts the motor terminals for mechanical braking. True regenerative braking (returning power to the supply) requires different topologies and is not supported.
Q: What about using this for an electric skateboard or scooter?
For 12V systems within the current limits, yes. However, most electric skateboards use higher voltages (24V-36V) and brushless motors requiring different controller types. For 12V hub motors within 30A, this driver would work well.
