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I am into the design of a simple voltage-mode buck converter with the good old TL494. I realized I need compensation to make it a stable supply, so I am trying to use the most simple technique described in a note from Texas Instruments. I attached the relevant page.
All would be fine, but the example in the paper is using an amplifier connected in inverting mode, while I need it in non-inverting mode for the TL494 to work. So I checked the math and found that I would get the very same gain result with the inverting and non-inverting input exchanged. The sign in equation 64 gets inverted, but it only inverts the sign in equation 65 of the portion that is neglected anyway.
I would have the feeling that it is not that simple. Shouldn't an inversion cause the phase to shift 180°? Or am I confusing something here? How could I make sure I am doing what I intend?
Any ideas or pointers are welcome.
All would be fine, but the example in the paper is using an amplifier connected in inverting mode, while I need it in non-inverting mode for the TL494 to work. So I checked the math and found that I would get the very same gain result with the inverting and non-inverting input exchanged. The sign in equation 64 gets inverted, but it only inverts the sign in equation 65 of the portion that is neglected anyway.
I would have the feeling that it is not that simple. Shouldn't an inversion cause the phase to shift 180°? Or am I confusing something here? How could I make sure I am doing what I intend?
Any ideas or pointers are welcome.
