Wurth power module question

[Alex Eisenhut]

https://katalog.we-online.com/pm/datasheet/171021501.pdf

Can someone tell me what to do with the SW pins on this device? The datasheet unhelpfully says to not connect these pins to other functions, the sample layout in the datasheet shows them all connected together, but the Wurth eval board shows them all floating.

In any case they seem to be internally connected. It's frustrating to see a datasheet from 2016 that still isn't updated, or am I complaining too much?

How about the bizarre layout guidelines for the ground splitting they recommend? Also not done on the eval board, everything is connected together.

Anyone ever use these? What did you do? The module itself works very well on the eval board, my guess is to simply follow the board itself, SW pins all floating, all grounds in one plane.

[T3sl4co1l]

The SW note is dumb, yeah.  Seems you'd want to tie them together with a pour, for thermal capacity, but to connect nothing else (unless of course you want to try some snubbing or damping, which they'll never suggest, but that's where you'd do it).

The layout seems not inconsistent with the GND note; see that there's no other GND connections to the back side plane, so AGND is essentially tying to PGND at the point indicated.  I don't see anything wrong with pouring copper over everything GND, top and bottom.

Tim

[capt bullshot]

Oh, another ugly Würth stuff -- thrown together an inductor (made by a company like Pulse or whatever they've bought) into a re-branded power module (check the usual suspects like LT for a similar one).