[SI-LIST] Re: power supply output series jumper
- From: alan.hiltonnickel@xxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 02 Nov 2011 12:00:19 -0700
Mort, In addition to the other good advice, keep in mind that zero-ohm
resistors are never really zero ohms, so you will have a voltage drop of
indeterminate value. You would be better off putting a specified
milliohm-range resistance so you know what the voltage drop is. In fact,
your test guys will appreciate this, as it will allow them to measure
the actual current being consumed in real time without disconnecting the
resistor.
Alan Hilton-Nickel
Oracle Corp
On 11/2/2011 10:38 AM, Rick Collins wrote:
> I have not looked at the specs for various size zero-ohm jumpers
> lately, but assuming the one you pick can handle the current I don't
> think you will find any real issue with that. I have even seen such
> jumpers used in ground plane isolation connections. I would think
> this would be at a point ahead of (closer to the power supply) than
> your decoupling caps. In general this sort of thing is very
> important for test and debug and I recommend that you try to
> accommodate your test people.
>
> Rick
>
>
> At 12:32 PM 11/2/2011, you wrote:
>> This is a power supply question, however I figure it's OK for this list
>> since it concerns power integrity.
>>
>> On my processor board I need to design a 1.0V +/- 50 mV point-of-load
>> power converter for my CPU core voltage. 6A output current. I'm
>> planning to use TPS53315, which should work with my 5V input voltage.
>>
>> I'm being asked by the test guys to include a series jumper (zero-Ohm
>> resistor soldered to the board) on the supply output, so the test guys
>> can remove the jumper if they want during power supply troubleshooting.
>> I'm nervous about including this jumper. For best power integrity I
>> would rather not have the jumper in the path. My question is, do folks
>> think I am being too paranoid?
>>
>> Thanks much for your comments.
>>
>> Mort
>>
>>
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