Can DAQ power a 33 output LED Driver which is driving 13 Bi-colour LEDs?

[rjjhh]

USB-1208FS supplies 5v I believe so can it supply that much to the LED driver which is running 13 Bi-colour LEDs

Thanks

 

[IRstuff]

You do realize that it's current that's required, not just voltage, right? It's not cool to make people hunt down the datasheet when you could have posted a link.

In any case, the output current of the analog output is only 6mA, which is usually too little for LEDs, but since you've not posted any information about the LEDs, so who knows?

TTFN
faq731-376

Need help writing a question or understanding a reply? forum1529

Of course I can. I can do anything. I can do absolutely anything. I'm an expert!

 

[rjjhh]

Sorry here is the link for the LED datasheet

http://www.rapidonline.com/pdf/55-0168e.pdf

is that output current of the analog output from the DAQ? which is 6mA

 

[IRstuff]

Yes, and you can see from your datasheet that the LED requires 20 mA

TTFN
faq731-376

Need help writing a question or understanding a reply? forum1529

Of course I can. I can do anything. I can do absolutely anything. I'm an expert!

 

[rjjhh]

sorry where exactly on the datasheet does it say it's 20mA ?

So is there anything I can do to get the current to drive the 13 Leds? but not all of them will be on at the same time only 1 will be on as the next on in line blinks

here is the datasheet for the LED driver

http://www.datasheetlib.com/datasheet/241919/gm6486_hynix-semiconductor.html

Thanks for the help I really appreciate it

 

[rjjhh]

here is the datasheet for the DAQ

http://www.mccdaq.com/PDFs/manuals/USB-1208FS.pdf

Doesn't it say if it's connected through a usb to pc there is 500mA ( under power subheading page : 25 )

 

[IRstuff]

"sorry where exactly on the datasheet does it say it's 20mA ?"

On the first page.

The power of the USB port has nothing to do with whether the DAQ can drive LEDs. Unless you are simply using the Vcc connection only, but then, what's the point of the DAQ?

Is the driver in addition to the DAQ, or instead of the DAQ? In either case, you've picked a driver than can only supply 15 mA

TTFN
faq731-376

Need help writing a question or understanding a reply? forum1529

Of course I can. I can do anything. I can do absolutely anything. I'm an expert!

 

[rjjhh]

DAQ is being used so that the LEDs can be controlled through LabVIEW, so DAQ works well with that so that is why the DAQ is being used.

How will the LEDs receive current in this case which they need to be able to work?

I thought the DAQ might provide current as well but maybe I am mistaken, I know the LED driver provides current so that only provides 15mA and I need 20mA for the LEDs to work, any way I can make them work?

Thanks really appreciate this.

 

[MacGyverS2000]

Are the LED drivers supplied with power separately and the DAQ being used simply to switch them on/off, or are the drivers receiving power directly form the DAQ? If it's the latter, it won't work... if it's the former, you have a chance.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[IRstuff]

But, even then, the drivers are underpowered for the LEDs; 15mA sink vs 20mA LED, although, you could run two outputs to each LED, which would still leave you with 7 unused outputs.

TTFN
faq731-376

Need help writing a question or understanding a reply? forum1529

Of course I can. I can do anything. I can do absolutely anything. I'm an expert!

 

[rjjhh]

Well I was planning to power the LED driver through the DAQ, but if that won't work how can I power the LED driver?

Yes that is what I am planning to do have two outputs for each LED,as it is a bi-colour LED so current will run through each leg of the LED to determine which colour should be displayed, will this be able to make the LEDs work?

Thanks

 

[IRstuff]

You need 20mA through either color to get its rated output. You could skimp, but the luminous intensity curves say that reducing the current down to 15mA will reduce the output to about 50% of the spec value. The power to the driver can be supplied by the external power pins on the DAQ, pin 30 from the datasheet.

TTFN
faq731-376

Need help writing a question or understanding a reply? forum1529

Of course I can. I can do anything. I can do absolutely anything. I'm an expert!

 

[rjjhh]

So would I need to use another Led driver which has enough current to drive the leds?, or would I be better of changing the Leds?

Thanks

 

[MacGyverS2000]

Tell us exactly what you're trying to accomplish with this setup. Trying to solve this problem one tiny piece at a time is becoming painful. For all we know, you're entire problem could be solved with a batch of LED flashlights from the Dollar store.

Dan - Owner

http://www.Hi-TecDesigns.com