At 21.02 2011.12.28, you wrote:
>At 08:42 AM 12/28/2011, Electron wrote:
>>At 16.05 2011.12.28, you wrote:
>>
>>So if I connect the TPS2816 ground wire to the source lead, rather than
>>to the main ground, this problem should be prevented, right?
>
>Nope.  Less of a problem, perhaps, but it WILL oscillate.  Damping=20
>the gate is the only thing that has worked for me.  A low-value=20
>resistor or ferrite bead in series with the gate RIGHT AT THE FET is=20
>the solution.

By the way (I say it to benefit other ignorants like me possibly on the
list!) if You use a ferrite bead, always place it as near as possible to
the source of noise. If it's through hole and you're mounting it vertically=
,
one lead will be bent and much longer than the other. Connect the other (th=
e
shorter lead) to the device which is generating noise.

For power supply it means to connect the ferrite bead as close as possible
to the MPU, and the longer lead to the power supply. Sure it's not the powe=
r
supply which is generating noise. ;)

What I wrote above is mainly for EMI reduction.

Cheers,
MarI/O


>
>dwayne
>
>--=20
>Dwayne Reid   <dwayner@planet.eon.net>
>Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
>(780) 489-3199 voice          (780) 487-6397 fax
>www.trinity-electronics.com
>Custom Electronics Design and Manufacturing
>
>--=20
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