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Learning op amp compensators

MacIntoshCZ

Active Member
Hi,
i will probably need to add compensator to my PSU for voltage control becouse of squezing.
Actually i dont know nothing about it. Can you recomend me some article that will cover everything? Like what is that, why its used, derivating equations... In populistic way.
thanks
 

crutschow

Well-Known Member
Most Helpful Member
i will probably need to add compensator to my PSU for voltage control becouse of squezing.
What is "squezing"?
What PSU do you have?

The easiest way to compensate a circuit is to simulate it with a program such as the free LTspice program from Analog Devices, and do an AC Bode plot to determine the gain and phase margin.
 

MacIntoshCZ

Active Member
He means Squegging, I believe; the PWM is hunting at an audible frequency rather than staying at constant given for a given load.
=D Yeah you are right i screw it up. I am suffering skipping pulses instead of lowering duty cycle on voltage feedback which is resulting to hearable noise from 100Hz - 5khz
But current feedback works well.
Its DIY. At the moment i have both feedbacks connected to error op amps in tl494.

How bode plot is affected due output voltage? Its due output choke "voltage ramp"? What makes it fail? Thanks
 
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