I have been given some PWM specs from a customer:
500Hz (+/- 5%)
0-5V
0-100% duty cycle (The duty cycle with change the speed of a pump).
I need to convert the PWM signal to an analog signal for my controller. I have been told to try an RC Filter.
The RC Filter response needs to be < 1 second, as the pump speed will change frequently. I would also like to get the RC Filter output to be as close to 5V as possible at 100% duty cycle. If it matters, the device has an internal resistance of 36k Ohms.
Im assuming this an easy multi-stage RC low pass filter. I do not have the time and/or resources to get this done by myself. Is anyone around that has some filter experience that could give the some tips and/or RC values to try?
Does all this make sense? Any ideas, questions, concerns?
500Hz (+/- 5%)
0-5V
0-100% duty cycle (The duty cycle with change the speed of a pump).
I need to convert the PWM signal to an analog signal for my controller. I have been told to try an RC Filter.
The RC Filter response needs to be < 1 second, as the pump speed will change frequently. I would also like to get the RC Filter output to be as close to 5V as possible at 100% duty cycle. If it matters, the device has an internal resistance of 36k Ohms.
Im assuming this an easy multi-stage RC low pass filter. I do not have the time and/or resources to get this done by myself. Is anyone around that has some filter experience that could give the some tips and/or RC values to try?
Does all this make sense? Any ideas, questions, concerns?