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Description: Polol MC33926 - single channel motor controller 28V/2.5A
The MC33926-based module allows you to control motors with a supply voltage of up to 28 V and a continuous current draw of up to 3 A. (with appropriate cooling). The controller can also withstand current peaks of up to 5 A for several seconds. The speed can be controlled withPWMsignal up to 20 kHz. An analogue FB output allows the current consumption of motors with a sensitivity of 0.525 V/A to be measured. The module also has protection against excessive current flow and overheating. Details inthe documentation.
MC33926 motor controller outputs
| PIN | Description |
|---|---|
| VIN GND |
Motor power supply (5 V-28 V). Mass potential. |
|
OUT1 |
Outputs for motor controlled by inputs IN1 and IN2. |
| IN1 IN2 |
Inputs controlling the OUT1 and OUT2 outputs. Outputs in high state by default. |
| PWM / D2 | Blocking input - inverted. When D2 is in low state, outputs OUT1 and OUT2 are in high impedance state. PWM input is not inverted. Filling 70% for the controller also gives 70% for the motor . Outputs are in the low state by default. |
| PWM /D1 | Blocked entrance. When D2 is in high state, OUT1 and OUT2 are in high impedance state. The PWM input is reversed. 70 % Fill, it will pass 100 %-70 % or 30 % to the motor. The output is in the high impedance state by default. |
| VDD | Output voltage 3 V-5 V. Use only to pull the SF pin to high. |
| SF | Status flag indicating too much current or short circuit. Default is high. Low state appears when there are problems. High state by default. |
|
FB |
Output to measure the flowing current. Voltage increases by about 525 mV to 1 A. Output in low state by default. |
|
EN |
Sleep. When the low state is given, both channels will be in low power mode. The output will be in low state by default. |
|
SLEW |
Selection of the output voltage slope time. Low state - slow rise (1.5 us - 6 us). High state - fast rise (0.2 us - 1.45 us). For PWM frequencies above 10 kHz, fast rise is recommended. The output is in low state by default. |
|
INV |
The high state changes the control of inputs IN1 and IN2 for both channels. The default state is low. |
Polol controller dimensions
The outline of the module is a rectangle measuring 25.4 x 30.5 mm.
Heat dissipation in Polol MC33926
The MC33926 integrated circuit used in the module allows for a current flow of up to 5 A. However, without proper cooling, the controller will overheat at lower currents. For example, at room temperature the controller is able to supply 5 A for about 5 s and 4 A for about 18 s. After this time, the temperature protection switches off the system. At the consumption of 3 A, the protection was activated after a few minutes. To increase the current capacity of the system, aheat sinkshould be used,which can be mounted with thermo-conductive adhesive.
Module diagram
The system contains the necessary components for proper operation of the controller. The outputs are popular goldpin connectors (2.54 mm raster), thanks to which the system can be connected by wires.
Polol MC33926 motor controller specification
- Motor supply voltage: 5 V - 28 V
- The voltage of the logical signals: 2.5 V - 5.5 V
- Continuous output current: 2,5 A (up to 3 A with heatsink)
- Maximum instantaneous current: 5 A
- PWM frequency: up to 20 kHz
- Protection against incorrect power supply
- Dimensions: 45.7 x 27.9 mm
- Weight: 8 g
- Included: module, power connector, gold pin.
Useful links |
