Learning op amp compensators

[MacIntoshCZ]

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]

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.

 

[rjenkinsgb]

What is "squezing"?

He means Squegging, I believe; the PWM is hunting at an audible frequency rather than staying at constant given for a given load.

 

[MacIntoshCZ]

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