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How can I explan this simple PWM creator Circuit

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harli03

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Can you say me how to explain the Uoutput of this circuit?How it works?
 

It doesn't.

If 'Uoutput' is the voltage at the drain of M1, it will be V1 divided by R1 and the Rds of M1 . Probably just a much smaller version of V1.
It doesn't generate PWM at all.

Brian.
 

Hi,

Swap V1 and V2 over to begin with, or make V2 switch faster and slower to get a feel for the very rough idea of pwm. The mosfet has to switch on and off to pass more or less of a varying supply voltage to maintain a constant voltage or current at the drain, sensing feedback at the source would be easier. Mosfet switching between time on to time off has to be based on a feedback signal that senses Vout and compares it to a reference value.
 

Hi,

PWM generation with discrete parts needs at least a capacitor for timing setup.

(I gues I have not designed an active circuit in the past 30 years without a capacitor. At least a power supply decoupling capacitor is essential...)

Klaus
 

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