Re: [Gumstix-users] TOBI TPS62111 circuit

[Neil M. <ne...@gu...>]

Hi Dave,
No other changes - how does your input voltage look? Do you have a
load on the output?

-
Neil

On Tue, Jun 19, 2012 at 5:11 PM, Dave Billin
<dav...@va...> wrote:
> OK.  Scratch that last comment about C12 being populated.  Closer
> examination shows that C12 is getting the zero ohm resistor (instead of
> R33).
>
> My question about other undocumented changes to the circuit still stands,
> however.
>
>
> Best Regards,
>
> Dave Billin
>
> Graduate Research Assistant --MS Computer Engineering
> University of Idaho
> Moscow, Idaho 83844
>
> e-mail: dav...@va...
>
>
> ________________________________
> From: Dave Billin [dav...@va...]
> Sent: Tuesday, June 19, 2012 5:02 PM
> To: gum...@li...
> Subject: [Gumstix-users] TOBI TPS62111 circuit
>
> I have reused the TPS62111 step-down regulator circuit on the Gumstix TOBI
> for a custom carrier board.  Unfortunately, the circuit on my custom board
> is putting out +3.9V instead of the desired +3.3V.  According to the
> "Readme.txt" in the TOBI folder
> (http://pubs.gumstix.com/boards/TOBI/Readme.txt), I should be leaving C12
> and R34 unpopulated and shorting R33.  However, in looking at my R3134 TOBI
> board (which uses a TPS62111 and works just fine), I can see that both R33
> and R34 are unpopulated and C12 is clearly present.
>
> Are there additional changes in the TOBI TPS62111 regulator circuit that
> were implemented during production that I need to be incorporating into my
> own design?
>
> On a side note: I think it would be very helpful if the notes in Readme.txt
> started appearing directly in the TOBI schematic instead of a separate
> document.
>
>
> Best Regards,
>
> Dave Billin
>
> Graduate Research Assistant --MS Computer Engineering
> University of Idaho
> Moscow, Idaho 83844
>
> e-mail: dav...@va...
>
>
>
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