[SI-LIST] Re: SPARTAN IIE Voltage regulator selection
- From: Prasanna Nambi <Prasanna.Nambi@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 25 Oct 2002 22:00:05 +0530
hi,
i don't think the fpga takes such high current as u suspect.I guess it is
around 0.4A to 0.7A (depending on the device u use)on power up.Off the shelf
any LDO with 1 A rating may be able to supply this power.Need not complicate
with s/w reg.if u intend to use that also(for eff) then use devices without
current sense or design current sense fairly higher(140%) than ur actuall
power req.
Just ensure ur source is capable of supplying this power.Also it is better u
take the complete worst casse power requirement of the board and ensure that
ur i/p power supply can supply 120% of this rated power.
Otherwise i don't think there is any issue using the device.FYI this xilinx
series is one of the most popularly used device , so there may not be much
complication in power req. as u suspect.
Prasanna
-----Original Message-----
From: Ismail B - CTD, Chennai. [mailto:ismailb@xxxxxxxxxxxxxxx]
Sent: Friday, October 25, 2002 5:24 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] SPARTAN IIE Voltage regulator selection
Hello there!
I want to know if anyone used SPARTAN IIE FPGA in any of their design. It
seems that
the FPGA draws a high current during start up which appers almost like a
short circuit
I am in the process of selecting an appropriate Voltage regulator but not
sure how good
it will be. My worst fear is that once the Voltage regulator senses the high
current draw
it may shutdown. It will be of great help if anyone could provide the part
number/manfacturer
of Voltage regulator used in their earlier (working :) ) design.
Thanks,
Ismail
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