Power Supply

Any technical questions about the Epiphany chip and Parallella HW Platform.

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Power Supply

Postby adeshpande » Fri Jul 04, 2014 1:56 pm

Hi,

These are the specifications for the power supply right?

A high quality 2000mA rated 5V DC power supply with 5.5mm OD / 2.1mm ID center positive polarity plug.


I was wondering what flexibility I have with those specifications because I can't really find those exact specifications.

For example, can I use a power cord with less amperage, less voltage, more amperage, more voltage, etc???

Thanks
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Re: Power Supply

Postby tnt » Fri Jul 04, 2014 2:20 pm

adeshpande wrote:A high quality 2000mA rated 5V DC power supply with 5.5mm OD / 2.1mm ID center positive polarity plug.[/b]

I was wondering what flexibility I have with those specifications because I can't really find those exact specifications.

For example, can I use a power cord with less amperage, less voltage, more amperage, more voltage, etc???


The only flexibility is on the amperage. Anything above 2A will do.
The rest has to be exactly what's specified.
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Re: Power Supply

Postby adeshpande » Fri Jul 04, 2014 2:44 pm

Alright thanks. Anybody else wanna confirm?
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Re: Power Supply

Postby 9600 » Fri Jul 04, 2014 4:35 pm

I would concur with Sylvain and he certainly knows what he is talking about when it comes to such matters :)

Cheers,

Andrew
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Re: Power Supply

Postby timpart » Fri Jul 04, 2014 4:42 pm

tnt is correct. Going above 4 amps does run a risk a blowing a fuse if you ever short out the power rails on the board.

I suggest you search for "5V 2.5A power barrel" and similar phrases. Some site call them power adapters rather than power supplies. Then look at the specifications of what size and polarity the barrel is. Also 2500mA is the same as 2.5A and some sellers use mA. So look for 2000mA as well as 2A and so on. Make sure the mains plug and voltage is suitable for your part of the world!

The reason Adapteva specify a good quality 2A supply is that the start up current needs of the board are higher than the typical needs and lower quality supplies can't handle the initial load. So you might be better off buying a 2.5A or 3A supply.

If you are still having problems, you can put power into the micro USB connector next to the power barrel connecter as an alternative. USB power supplies are 5V as standard, so you need to find one that can supply the current (USB is typically no more than 500mA, so looking for a "USB charger" might help find a higher rated one.)

Tim
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Re: Power Supply

Postby adeshpande » Fri Jul 04, 2014 10:48 pm

The problem with this product is that it doesn't have the right connecter, right?

http://www.microcenter.com/product/3179 ... MP_,12V-5V)_w-_4-pin_Molex_Connector
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Re: Power Supply

Postby adeshpande » Sat Jul 05, 2014 12:51 am

Do you guys think that 4 Amps would be too much?
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Re: Power Supply

Postby paran » Sat Jul 05, 2014 1:31 pm

adeshpande wrote:Hi,

These are the specifications for the power supply right?

A high quality 2000mA rated 5V DC power supply with 5.5mm OD / 2.1mm ID center positive polarity plug.


I was wondering what flexibility I have with those specifications because I can't really find those exact specifications.

For example, can I use a power cord with less amperage, less voltage, more amperage, more voltage, etc???

Thanks

The higher amperage the better say 3A or 4A. The voltage must be exactly specified. The board will not draw more that it needs and 2A is a minimum. For example, if you connect more usb type devices to it, it will try to draw more current. Thats why 3A or 4A may not hurt. The best way to get power adapter is to order it from parallella. I got it with 3A and so far it is okay.
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Re: Power Supply

Postby greytery » Sat Jul 05, 2014 3:21 pm

adeshpande wrote:The problem with this product is that it doesn't have the right connecter, right?
http://www.microcenter.com/product/3179 ... MP_,12V-5V)_w-_4-pin_Molex_Connector

Right!!
To use this you would need some sort of molex socket to barrel plug adapter. There are many 5v power supplies out there that provide the correct type of plug.
Keep searching for a 5v supply with the correct type of plug.

Also, if you check the spec tab on the page, you'll see "Output: 12 VDC - 2Amp, 5VDC - 2Amp"
That is, it will feed only 2Amp on the 5v pair in the molex plug.

Cheers,
tery
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Re: Power Supply

Postby adeshpande » Sat Jul 05, 2014 5:30 pm

This is a product that I'm considering. Would this work?

http://www.pimfg.com/Product-Detail/PIPS-5V2A-21
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