Power Supply for Xilinx FPGA

D

Derek Simmons

Guest
Hi,

I'm looking for recommendations for a power supply for development
boards with Xilinx VirtexE parts (ie. XCV405E, XCV300E) that require
2.5 V, 3.3 V and 5 V. I'm looking for something cheap or a website
that explains how to build such a beast.

I'm also interested in hearing anybody's experiences of what works and
doesn't.

Thanks,
Derrke Simmons
 
Derek,
Hmmm, what input power do you have? Are you any good at PCB layout? How many
are you making? Why are you using Virtex-E? Have you ever been in a Turkish
prison?
Whatever, my current (ha ha) favourites are LT parts. I've got a good FAE!
LTC3728 is a dual controller can take up to 24V in and make 5V and 3.3V. I
use LTC3414s to make core voltages from these supplies. LT do demo boards
for both parts. Be environmentally friendly, ditch the evil linear
regulators, use switchers! Especially as you can get 6.3V 100uF X5R ceramic
in a 1210 package these days. And check out Panasonic's specialty polymer
electrolytics. Bloody marvellous, 5 milliohm ESR.
Cheers, Syms.

"Derek Simmons" <Derek_SImmons@msn.com> wrote in message
news:14030831.0408060846.73ab7ffe@posting.google.com...
Hi,

I'm looking for recommendations for a power supply for development
boards with Xilinx VirtexE parts (ie. XCV405E, XCV300E) that require
2.5 V, 3.3 V and 5 V. I'm looking for something cheap or a website
that explains how to build such a beast.

I'm also interested in hearing anybody's experiences of what works and
doesn't.

Thanks,
Derrke Simmons
Click to expand...
 
"Derek Simmons" <Derek_SImmons@msn.com> wrote in message
news:14030831.0408060846.73ab7ffe@posting.google.com...
Hi,

I'm looking for recommendations for a power supply for development
boards with Xilinx VirtexE parts (ie. XCV405E, XCV300E) that require
2.5 V, 3.3 V and 5 V. I'm looking for something cheap or a website
that explains how to build such a beast.

I'm also interested in hearing anybody's experiences of what works and
doesn't.

Thanks,
Derrke Simmons
Click to expand...
national
http://www.national.com/appinfo/power/

http://www.national.com/appinfo/webench/power/SS/SS.cgi?flow=power&step=0A
enter your requirements
 
Derek Simmons wrote:

I'm looking for recommendations for a power supply for development
boards with Xilinx VirtexE parts (ie. XCV405E, XCV300E) that require
2.5 V, 3.3 V and 5 V. I'm looking for something cheap or a website
that explains how to build such a beast.
Click to expand...
XCV405E, XCV300E ... it looks like small FPGAs. I don't know if it will
help but on the other range of the Xilinx Family (Virtex-II and
Spartan-3 > 1Mgates), we use Texas Instruments DC/DC converters (search
for Swift Technology) to generate the various supply voltages. The main
advantage is to have a power conversion efficiency around 90% and
therefore not to dissipate that much power during the conversion itself
(which is nice if you have to supply a few A).

Moreover, they have a software tool that you can douwnload which will
give you the schematics around the converters (capacitances, resistors,
....) as well as the precise references of all active/passive components.
I've no interest in supply voltage and therefore this tool makes the job
a lot easier :) All the boards that we have designed work pretty well
w/ it.

Eric
 
On Fri, 06 Aug 2004 10:05:26 -0700, Symon wrote:

Derek,
Hmmm, what input power do you have? Are you any good at PCB layout? How many
are you making? Why are you using Virtex-E? Have you ever been in a Turkish
prison?
Whatever, my current (ha ha) favourites are LT parts. I've got a good FAE!
LTC3728 is a dual controller can take up to 24V in and make 5V and 3.3V. I
use LTC3414s to make core voltages from these supplies. LT do demo boards
for both parts. Be environmentally friendly, ditch the evil linear
regulators, use switchers! Especially as you can get 6.3V 100uF X5R ceramic
in a 1210 package these days. And check out Panasonic's specialty polymer
electrolytics. Bloody marvellous, 5 milliohm ESR.
Cheers, Syms.
Click to expand...
Both TI and National (maybe Intersil too, I forget) have a bunch
of material geared to helping design power subsystems for xilinx
FPGA parts.

IMHO, LTC has nice stuff and good apps people, but the parts are
just too expensive.

Check out the Fairchild FAN5286 - dual switcher controller with
wide input range, DDR Vtt support and its something like $1.50 on
their web site. We got a fair bit better than that with a real quote
through distribution. There's even an Intersil part that's close to
a drop in replacement (pinout is the same, I haven't recalculated the
L's, R's and C's).

The only thing I don't like about it is it requires a +5V
rail, it doesn't have the internal regulator like some others.
 
Derek,

I am currently developing dual-voltage POL specifically to power FPGA's.
Reduce your time to market and use an off-the-shelf, highly-efficient,
pre-engineered power supply. It is very configurable but as a maximum can
supply 2 different rails of 3A each as well as a third rail of 250mA. As
a bonus a Xilinx platform flash is optionally included if you want.

I am targeting Spartan-3 device initially but there is no reason why it
won't work with any FPGA or DSP.

Email me if you want more specific information.

There will be info shortly at http://www.stratforddigital.ca/.

Cheers,

James.

On Wed, 11 Aug 2004 04:30:27 GMT, Andrew Dyer
<andrew.spam.dyer@comcast.net> wrote:

On Fri, 06 Aug 2004 10:05:26 -0700, Symon wrote:

Derek,
Hmmm, what input power do you have? Are you any good at PCB layout? How
many
are you making? Why are you using Virtex-E? Have you ever been in a
Turkish
prison?
Whatever, my current (ha ha) favourites are LT parts. I've got a good
FAE!
LTC3728 is a dual controller can take up to 24V in and make 5V and
3.3V. I
use LTC3414s to make core voltages from these supplies. LT do demo
boards
for both parts. Be environmentally friendly, ditch the evil linear
regulators, use switchers! Especially as you can get 6.3V 100uF X5R
ceramic
in a 1210 package these days. And check out Panasonic's specialty
polymer
electrolytics. Bloody marvellous, 5 milliohm ESR.
Cheers, Syms.


Both TI and National (maybe Intersil too, I forget) have a bunch
of material geared to helping design power subsystems for xilinx
FPGA parts.

IMHO, LTC has nice stuff and good apps people, but the parts are
just too expensive.

Check out the Fairchild FAN5286 - dual switcher controller with
wide input range, DDR Vtt support and its something like $1.50 on
their web site. We got a fair bit better than that with a real quote
through distribution. There's even an Intersil part that's close to
a drop in replacement (pinout is the same, I haven't recalculated the
L's, R's and C's).

The only thing I don't like about it is it requires a +5V
rail, it doesn't have the internal regulator like some others.
Click to expand...


--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/
 
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