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TPS40211 design
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Mat219:
Hello.

I'm working on an adjustable boost converter with TPS40211 and I have a few design questions about it:

1)How can I make the output voltage adjustable without screwing the compensation up?
2) Is it even necessary to have the compensation in the first place?
3) If I do need a compensation, is there some easy way of choosing the values for it?

Keep in mind I don't have a lot of spare components laying around so getting the values by experiment is not an option for me.

Thank you for your time.
thm_w:
Instructions to calculate compensation are in the datasheet: https://www.ti.com/lit/gpn/tps40211

You should probably have it, if its an issue, find another part which is internally compensated. The datasheet mentions series RC is the simplest option. If you are building a PCB, then add footprints for all three components.
Can also use webench to calculate it: https://webench.ti.com/power-designer/switching-regulator/customize/7?noparams=0

What I would do is pick the comp for the specific voltage you expect to be operating at most of the time. Then build it up and see if its stable at other voltages.
Another method might be to check the lowest and highest output voltages, then pick a value within that range.
Mat219:
Thanks.I'll try that.
One more thing.

Here is the datasheet:
https://datasheet.lcsc.com/szlcsc/1912281005_Texas-Instruments-TPS40211DGQR_C473356.pdf

The schematic on page 24, figure 8.2.1
I think that i can replace R5 and R7 with a potentiometer for adjustable output voltage.
Is that correct?
thm_w:
Yeah R5 and R7 divide down from Vout.
You may need to add additional series resistors to limit the voltage you can select (say 40V maximum).
Mat219:
Okay. Thank you so much.
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