Data Sheet

heavy loaded powerful motor controlled by the PWM signal. The DC motor polarity can be freely

reversed; doing so will only impact the direction of rotation.

DC motor direction of rotation

Although the PS is used to control DC motors in one direction of rotation, by adding 2 extra

transistors you can get an H-Bridge which allows you to control the motor in both directions.

[Fig. 13 – H-Bridge]

Some advice:

Use a P-Channel MOSFET transistor with a much higher U

voltage. It is best to have U

voltages of +/-20V or higher.

We have tested this circuit with IRF5305 – Q1 and Q2. The circuit began to work with a C1 –

MKC capacitor connected to motor terminals and resistors R1 and R2 with 510Ω resistance. Do

not forget to connect the C1 – MKC capacitor; it is very important!

Control your motors only with default PWM frequencies (0...2kHz).

Make sure that your power supply voltage does not drop below 10V because this is very

important for gate inputs for MOSFETs.

Do not open both channels at the same time; if you do, you will get a short circuit and burn your

MOSFETs.

If Q1 and Q2 transistors heat up significantly, attach them to heatsinks.