I'm doing this project, where i control the speed of a motor with a 0-3.3 V PWM signal from a microcontroller. In the test setup i use a function generator (Digilent Analog Discovery). I would like the PWM to run at 50 kHz, but for better measurements, I have lowered the frequency to 15 kHz, 50 % duty cycle. My problem is, that there seems to be some sort of capacitance in my circuit, lowering the FET's rise time, when i test it.
- "Opdrifts_PSoC-Blæser_signal" is the microcontroller. It is here i supply the - PWM in my test setup.
- "R6" is where the motor will be. In the test i use a 10 kOhm resistor.
- "Scope" is where i measure relative to ground.
Hope somebody here can help me out.