EM-A24 is a compact PCB-mountable driver module for brushed DC motors. It is based on the EM-241 motor driver and includes an efficient H-bridge power stage.
The module connects to the motherboard through a PCI Express 98 connector. Its vertical mounting orientation allows it to provide high motor current while requiring very little motherboard area. The low-emission power-stage design simplifies integration into equipment intended for industrial and household environments.
Board version v4 and later includes an RS-485 communication interface. The interface can be used for controlling and monitoring the driver and for configuring its operating parameters.
The EM-A24 is designed for direct installation on a motherboard using a PCI Express 98 connector. Its vertical mounting orientation minimizes the required PCB area and makes the module suitable for compact control-system designs.
The integrated power stage reduces the need to design and qualify a separate high-current motor output stage on the motherboard.
The module includes an efficient H-bridge power stage for bidirectional DC motor control. It can provide up to 12 A of continuous motor current and a peak current of up to 30 A, depending on the selected PWM frequency, duty cycle and operating conditions.
The adjustable current limit can be used to protect the motor, driver and mechanical system. During start-up, the available current limit can temporarily reach 30 A.
The PWM frequency can be selected between 2 kHz and 16 kHz. The 2 kHz setting provides the highest available output-current capacity.
The 16 kHz setting moves the switching frequency above the normal audible range, providing quieter motor operation with reduced continuous and peak-current capacity.
Board version v4 and later includes an RS-485 communication interface. The interface can be used to control the motor driver, monitor its operating status and configure its parameters.
RS-485 provides a robust communication interface for integrating the EM-A24 into distributed control systems and equipment with a central controller.
The adjustable overvoltage limit can be set between 15 V and 40 V. When this limit is reached, the motor is switched to freewheel operation to help prevent the supply voltage from rising further.
If the voltage reaches 40 V, the driver activates dynamic braking by short-circuiting the motor terminals. This helps control voltage generated by the motor during deceleration or when the motor is driven by an external load.
The EM-A24 supports adjustable start and stop ramps between 0 and 5 seconds. Digital control inputs accept industrial voltage levels, and the typical control-input response time is 5 ms.
A fault output is available as an NPN open-collector signal. The module also provides an active-low fault input.
The power stage is designed for low electromagnetic emissions. This can help the completed system meet applicable EMC requirements without additional external suppression components. EMC compliance must nevertheless be verified for the complete installation.
The module is CE tested for industrial EMC environments and operates across a wide temperature range of −40…+60 °C.
| Continuous supply voltage | 10–35 V, maximum |
| Adjustable overvoltage limit | 15–40 V; motor switched to freewheel |
| Dynamic-braking overvoltage limit | 40 V; motor terminals short-circuited |
| Start-up voltage | 9 V |
| Shutdown voltage | 8 V |
| Continuous output current at 2 kHz | 12 A at 100% duty cycle / 7 A at 5–99% duty cycle, Ta < 50 °C |
| Continuous output current at 16 kHz | 8 A at 100% duty cycle / 4 A at 5–99% duty cycle, Ta < 50 °C |
| Peak current at 2 kHz | 30 A for 5 s |
| Peak current at 16 kHz | 25 A for 5 s |
| Adjustable current limit | 0.1–25 A, max. 30 A during start-up |
| Overtemperature limit | 100 °C |
| Adjustable start and stop ramps | 0–5 s |
| PWM frequency | 2 kHz / 16 kHz, selectable |
| Maximum position-set input scale | 0–5.5 V |
| Digital control input levels | High = 4–30 V / Low = 0–1 V |
| Control input impedance | typ. 47 kΩ |
| Pulse input impedance | typ. 10 kΩ |
| Maximum pulse input frequency | 800 Hz per pulse input |
| Control input response time | typ. 5 ms |
| Communication interface | RS-485, board version v4 and later |
| RS-485 functions | Control, status monitoring and parameter setting |
| Motherboard connector | PCI Express 98 connector |
| Fault output | NPN open collector, max. 30 V / 50 mA |
| Fault input | Active when Uin < 1 V (NPN) |
| Dimensions | As shown in the dimensional drawing |
| EMC | CE tested for industrial environments |
| Operating temperature (Ta) | −40…+60 °C |
| Weight | 15 g |
Ordering larger quantities +100pcs.
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