Cytron MD25HV High Voltage DC Motor Driver 25Amp 7V-58V
The MD25HV is a rugged, single-motor DC driver designed for high-voltage battery systems. It packages robust MOSFET switching and onboard control circuitry into a compact board so users can connect a wide range of brushed DC motors directly to batteries or high-voltage supplies. The board’s layout groups power, control and output points for straightforward wiring and safe handling, reducing bench time during prototyping and testing.
Built to handle demanding loads, the MD25HV balances thermal management and current delivery through active protection systems and clear front-panel indicators. The unit exposes convenient inputs for PWM/DIR control as well as potentiometer and switch control so it can be driven by a microcontroller or used standalone. Test buttons and status LEDs let you quickly verify behavior without attaching diagnostic equipment.
The manual emphasizes predictable, safe operation across a broad voltage range and gives wiring and startup guidance to avoid damage from reversed polarity or undervoltage conditions. Protective behaviors such as active current limiting and temperature-based throttling let the board deliver usable performance while guarding its power stage, making the MD25HV suitable for robotics and mobile applications where high voltage and reliability matter.
Features:
- Supports high input voltage operation (wide 7–58 V range).
- Up to 25 A continuous motor current capability.
- Peak current handling for short durations (as specified in datasheet).
- PWM/DIR control input for microcontroller interfacing.
- Potentiometer + SPDT switch input option for standalone speed/direction control.
- Onboard 5V output for powering small MCUs/peripherals.
- Test buttons and motor status LEDs for quick functional checks.
- Active current-limit, temperature protection and undervoltage shutdown.
Board Layout:
| Function | Description |
| Power Input Terminal | Connect to battery. ● VB+ : Positive ● VB- : Negative Warning: Connecting in reverse polarity will damage the motor driver instantaneously. |
| Motor Output Terminal | Connect to motor terminal. Motor direction is depending on the polarity. |
| Power LED | Turn on when power up. |
| Error LED | Blink when there is error. |
| OC (Overcurrent) LED | Turn on when current limiting is in action. Current limit threshold is depending on the board temperature. |
| Motor Status LEDs | Turn on when the motor is running. ● MA : Forward ● MB : Backward |
| Test Buttons | Press to test the functionality of the motor driver. Motor will run at 78% of full speed. ● MA : Forward ● MB : Backward |
| PWM/DIR Input | Control the motor with PWM/DIR signal. ● PWM : PWM input for motor speed control. ● DIR : Direction input. ● 5VO : 5V Output. Can be used to power Arduino and other MCU. ● GND : Signal ground. |
| Speed Control Potentiometer | Connect to 10KΩ potentiometer for motor speed control. ● POT 1 (GND): Connect to pin 1 of the pot (Lowest speed). ● POT 2 (Analog In): Connect to pin 2 of the pot (Middle pin). ● POT 3 (5V): Connect to pin 3 of the pot (Highest speed). |
| Direction Switch | Connect to SPDT Switch for motor direction control. MA and MB are internally pulled high. ● MA : Short to GND to run forward. ● COM : Common pin. Connected to GND internally. ● MB : Short to GND to run backward. |
Specifications:
| Parameter (as listed) | Min | Max | Unit |
|---|---|---|---|
| Power Input Voltage: | 7 | 58 | V |
| Maximum Motor Current (Continuous): | — | 25 | A |
| Maximum Motor Current (Peak): | — | 60 | A |
| 5V Output Voltage: | 4.9 | 5.1 | V |
| 5V Output Maximum Current: | — | 250 | mA |
| Potentiometer Analog Input Voltage (POT 2): | 0 | 5 | V |
| Direction Switch Input Voltage – Low Level (MA, MB): | 0 | 0.8 | V |
| Direction Switch Input Voltage – High Level (MA, MB): | 3 | 5 | V |
| Logic Input Voltage – Low Level (PWM, DIR): | 0 | 0.8 | V |
| Logic Input Voltage – High Level (PWM, DIR): | 3 | 30 | V |
| PWM Input Frequency: | DC | 40 | kHz |
| Motor Driver Output PWM Frequency (internal output frequency): | — | 16 | kHz |
Dimension:
Input Mode:
1. PWM/DIR INPUT
| PWM | DIR | Output A (MA) | Output B (MB) | Motor |
|---|---|---|---|---|
| Low | X (Don’t Care) | Low | Low | Brake |
| High | Low | High | Low | Forward |
| High | High | Low | High | Backward |
2. POTENTIOMETER/SWITCH INPUT
Error LED Indicator:
|
ERR LED Blinking |
DESCRIPTION |
|
2 |
MOSFET Driver Error
This happens when there is undervoltage error or hardware failure. |
|
3 |
Overvoltage Error
Power input voltage has exceeded the maximum rating. If switching power supply is being used, connect a motor shunt regulator or rechargeable battery with same voltage in parallel with the power supply. This is to absorb the regenerative energy from the motor during deceleration. |
|
4 |
Overheat Error
Board temperature is over 80℃ (176℉). This is just served as a warning. The motor driver can still be safely operated. |
Applications:
- Electric Vehicle Powertrain Prototyping.
- Industrial Grade Conveyor and Material Handling.
- High-Power Robotic Actuators and Joints.
- Automated Agricultural and Gardening Equipment.
- Heavy-Duty Winch and Hoist Control Systems.
- Battery-Powered Industrial Tools and Carts.
- High-Torque Laboratory Automation Systems.
- Electric Go-Kart and Mobility Scooter Drives.
Package Contents:
- 1x MD25HV
- 1x Potentiometer with connector
- 1x Rocker switch with connector
- 4x Nylon PCB Standoffs/Spacers
| Datasheet: | MD25HV Datasheet | ||
| Certificate: | UKCA-EMC | UKCA RoHS | CofC |
| 3D CAD: | MD25HV | ||
| Official Reseller: | Makers Electronics |
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