Guys can somebody help me to control voltage of the regulator from a PIC pwm frequency?
Most people say generate a PWM signal feed to a low pass filter & feed into an gained opamp & drive a transistor.is this ok?
Required range
*Low end can be 1v or 1.25V & high end will be 30V with a resolution 0.5V.
I have rail to rail opamps in my hand & LM317.
Those are my questions.
*What frequency to drive?
*Low pass filter values?
*Whats the gain?
This is a problem for me from a long time----> I still cannot understand what will be happen if I feed a PWM signal to a low pass filter??
Most people say generate a PWM signal feed to a low pass filter & feed into an gained opamp & drive a transistor.is this ok?
Required range
*Low end can be 1v or 1.25V & high end will be 30V with a resolution 0.5V.
I have rail to rail opamps in my hand & LM317.
Those are my questions.
*What frequency to drive?
*Low pass filter values?
*Whats the gain?
This is a problem for me from a long time----> I still cannot understand what will be happen if I feed a PWM signal to a low pass filter??
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