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This is part four of evaluating a TPS54A20 on an evaluation board. The TPS54A20 is a buck converter with an interesting topology - it has two phases merged with a switched-capacitor. This isn't a formal road test (I was given the board by jancumps, nice person that he is) and I'm just doing what interests me and blogging about it. Disclaimer: some of what I do here is quite sloppy and, to be fair to TI, it shouldn't be taken as a proper review.   This time (by popular demand) it's effi ...
This is part three of evaluating a TPS54A20 on an evaluation board. The TPS54A20 is a buck converter with an interesting topology - it has two phases merged with a switched-capacitor. This isn't a formal road test (I was given the board by jancumps, nice person that he is) and I'm just doing what interests me and blogging about it. Disclaimer: some of what I do here is quite sloppy and, to be fair to TI, it shouldn't be taken as a proper review.   This time it's transient output testin ...
In this next part I'm going to look at the output on a static load.   Here's my output load:       For 10A at 1.2V I need a load of 120 mOhms (1.2V/10A) and it has to be able to dissipate 12W (1.2V x 10A). I made this up from cheap 1 ohm 0.25W resistors. Three resistors in series is 3 ohms; twenty-five of those in parallel is then 120 mOhms. Each resistor only has to dissipate 160mW, so they're reasonably comfortable. It measured 123 mOhms, so that will be an output ...
It's Christmas! Well, almost. Santa has been early and delivered a present to me. I didn't realise this, but he's moved his whole operation from the North Pole to Belgium (perhaps he likes chocolate, frites, and reading Tintin comic books).   The present is a TPS54A20EVM evaluation module. In case that doesn't ring any bells, it's the same board that jancumps has been experimenting with (the two-phase buck converter with a capacitor one). In fact it IS one of his boards - he's been ver ...