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TPS54232 buck regulator
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Topic: TPS54232 buck regulator (Read 1492 times)
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LukeW
Frequent Contributor
Posts: 686
TPS54232 buck regulator
«
on:
August 03, 2016, 12:53:07 pm »
Your basic, typical regulator stage with Vo=5V, Io=2A max, Vi=24V. Vo is actually set slightly high on purpose, at about 5.25V.
I was just looking for a quick bit of peer review on this, a sanity check to ensure that nothing silly is missing.
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Kean
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Embedded systems & IT consultant
Re: TPS54232 buck regulator
«
Reply #1 on:
August 03, 2016, 02:15:47 pm »
Looks basically fine to me.
You might want to increase R22/R23 values and decrease the ratio though. Those values are lower than typically recommended (waste of 2mA?), and with that ratio you'll be enabling the regulator from something like 9V which seems low if you're expecting a stable 24V supply.
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tszaboo
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Posts: 7938
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Current job: ATEX product design
Re: TPS54232 buck regulator
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Reply #2 on:
August 03, 2016, 02:42:51 pm »
Fuse or two, ESD protection, reverse input protection (everyone loves the popcorn capacitors). Any of these might be unnecessary. I would put some extra lower value ceramics on the output (100n), just for good measure. You can never have enough capacitors.
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Niklas
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Re: TPS54232 buck regulator
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Reply #3 on:
August 03, 2016, 03:18:29 pm »
LC-filter between +24V and the two input capacitors to attenuate conducted emissions. Could be possible to reuse footprints for L2 and C19.
As NANDBlog mentioned, add some input protection. You don't need much wiring, just a couple of inches, to create turn on transients that will exceed 30 V as stated in absolute maximum ratings. We have a board that is supplied with 28V, with 2x100nF at the input, that peaks at about 50V with a linear PSU and 2x20cm 0.25mm^2 wires.
http://cds.linear.com/docs/en/application-note/an88f.pdf
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TPS54232 buck regulator
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