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Another MAX9926 VR board 
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Yeah,but not for the purpose of dedicated VR use.

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Tue Oct 28, 2014 6:25 am
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LQFP112 - Up with the play
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I am far from understanding anything electrical, but I believe a common approach is to use 5k+5k instead of one 10K. I believe it was mentioned that this is a recommendation from some MAX application note.

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Thu Oct 30, 2014 3:48 pm
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They mention series/parallel resistor combos in an app note? Really? Max supplying elementary passive component selection advice to professional engineers in an app note. Risky business. Even I would feel patronised by that... Got a reference?

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Thu Oct 30, 2014 6:30 pm
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You are likely thinking of their evaluation board schematic, which uses two 5k in series instead of 1 10k. Can't remember the reason now, but it may have been to make the LPF more configurable.


Just had a look, they are only there to share the current, so they can use lower wattage resistors.

http://datasheets.maximintegrated.com/en/ds/MAX9926UEVKIT.pdf


Thu Oct 30, 2014 7:11 pm
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I dusted the cobwebs off of this PCB design last weekend, with Fred's recommended (optional) shunt resistor sized to accept regular through-hole 2W fare.
The first batch of 10 PCB's will be put in production this week somewhere in China (using Elecrow again, like their service a lot).
I'll post some more info once I receive the PCB's, I can assemble about 5 with the sample 9926's I have.

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Mon Jun 20, 2016 8:52 am
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depending on price, i would take one or two assembled units. maybe even some bare PCB


Tue Jun 21, 2016 7:35 pm
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I'd wait a little if I where you. Just found out it was unwise to be so hasty with sending off the gerbers..
Had this nagging feeling and rechecked the design, shunt is in the wrong place. No big loss but it'll take
a little longer to get the corrected design fabbed.

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Wed Jun 22, 2016 9:42 pm
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Image

Gutted! :-(

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Wed Jun 22, 2016 11:59 pm
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LQFP112 - Up with the play
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'Tis but a scratch... I've mailed them a request to update the gerbers if it hasnt hit production yet (fat chance), or to just pay another 10 dollars and have them
ship the corrected pcb along with the duds.

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Thu Jun 23, 2016 7:30 am
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FWIW the shunt can be installed in the loom right at the connection to the board or box or whatever. It doesn't have to have PCB real estate, it's just cleaner for it to, and rules out putting it too far away and allowing a noise injection window between it and the board.

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FreeEMS dev diary and its comments thread and my turbo truck!
n00bs, do NOT PM or email tech questions! Use the forum!
The ever growing list of FreeEMS success stories!


Thu Jun 23, 2016 11:32 am
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