voltage regulators on FPGA boards

Hi,

I wanted to know what kind of voltage regulators are used on FPGA boards. I am using the XSA-50 board, and need to do some current measurements using the voltage regulator.

Thanks Ankyag

Reply to
ankur101
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Hmmmm !

Graham

Reply to
Pooh Bear

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The manual's schematic section shows diode D1 feeding a 7805 linear regulator to get 5V, followed by an LM317 adjustable regulator set to 3.3V, followed by a silicon diode to drop the voltage to about 2.5V. You can use a multimeter across D1 to measure the current. Use the meter's current mode and jacks. Note, this will short across the polarity protection diode, but you could use the meter's voltage mode to confirm that you have proper battery polarity before making the current measurement.

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 Thanks,
    - Win
Reply to
Winfield Hill

Thanks ! will have a look !

Reply to
ankur101

Hi,

I am interested in measuring the current consumed by the FPGA (which runs off the 2.5V). I was wondering if the better approach would be to remove the shunt from the jumper J2, and use my own 2.5V supply. Then I could measure the current, account for the RC in parallel with the chip and calculate the current consumed by the FPGA.

The other way to do the same thing would be to (a) not remove the jumper, and (b) measure the current across D2.

Which approach would you recommend ?

Thanks,

-Ankyag

Reply to
ankur101

How about measuring the current across the J2 shunt? (ie. remove the shunt and put your current meter between the two pins)

Alan Nishioka

Reply to
Alan Nishioka

Do not short D2. This will cause 3.3V to be applied to the 2.5V pins. Shorting D1 is okay because that is the input to the voltage regulator.

Alan Nishioka

Reply to
Alan Nishioka

thanks for the insight !

-ankyag

Reply to
mammo

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