Hello there,
I set MAX8792 buck controller by connecting a voltage divider between REF-pin (2V output) and REFIN-pin. Regulated V[SUB]Out[/SUB] = V[SUB]REFIN[/SUB]. But If I want higher than 2V output, I must use a voltage divider that reduces V[SUB]FB[/SUB]. V[SUB]OUT[/SUB] will be rise directly proportional with this reduction. Fig. 4 on p. 17 of the datasheet has a very effective illustration: https://www.electro-tech-online.com/custompdfs/2012/01/MAX8792-2.pdf
I opted for ceramic caps. According to datasheet I must use AC or DC coupled current sense compensation if I wishes to do this (p. 23 of the datasheet.) I chose AC-coupling.
The question is what happens to V[SUB]FB[/SUB] when I use this compensation? Surely R[SUB]COMP[/SUB] (67Ohm) must alter V[SUB]FB[/SUB]? Without knowing I cannot determine which V[SUB]OUT[/SUB] (and a bunch of other things) I will get.
What do you think?
Thank you for your time.
Kind regards,
Marius
I set MAX8792 buck controller by connecting a voltage divider between REF-pin (2V output) and REFIN-pin. Regulated V[SUB]Out[/SUB] = V[SUB]REFIN[/SUB]. But If I want higher than 2V output, I must use a voltage divider that reduces V[SUB]FB[/SUB]. V[SUB]OUT[/SUB] will be rise directly proportional with this reduction. Fig. 4 on p. 17 of the datasheet has a very effective illustration: https://www.electro-tech-online.com/custompdfs/2012/01/MAX8792-2.pdf
I opted for ceramic caps. According to datasheet I must use AC or DC coupled current sense compensation if I wishes to do this (p. 23 of the datasheet.) I chose AC-coupling.
The question is what happens to V[SUB]FB[/SUB] when I use this compensation? Surely R[SUB]COMP[/SUB] (67Ohm) must alter V[SUB]FB[/SUB]? Without knowing I cannot determine which V[SUB]OUT[/SUB] (and a bunch of other things) I will get.
What do you think?
Thank you for your time.
Kind regards,
Marius