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banh
Joined: 16 Dec 2004
Posts: 472
Helped: 12
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 23 Sep 2005 11:17 driving power led |
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i wish to drive this type of led for dashboard using mcu
http://www.fairchildsemi.com/ds/QT/QTLP670C.pdf
with forward current around 30mA.
around 14-15 of this leds need to be driven.
what is the suggested driver i should use?
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IanP
Joined: 05 Oct 2004
Posts: 6492
Helped: 1542
Location: West Coast
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23 Sep 2005 11:41 Re: driving power led |
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You can use 500mA X 8 driver IC( ULN2802 ) or you can employ ordinary transistors with currents of up to 500mA such as 2N2222 ..
Regards,
IanP
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banh
Joined: 16 Dec 2004
Posts: 472
Helped: 12
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23 Sep 2005 11:53 Re: driving power led |
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thanks for suggestion.
i think i may need some automotive grade drivers/transistors..
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IanP
Joined: 05 Oct 2004
Posts: 6492
Helped: 1542
Location: West Coast
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23 Sep 2005 12:07 Re: driving power led |
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Not necessarily .. if you look inside, say, motor bike ignition boxes you will find out that they use standard components, but after testing the box just potted with a non-corrosive resin ..
Regards,
IanP
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23 Sep 2005 12:07 Ads |
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bobcat1
Joined: 10 Jul 2002
Posts: 1118
Helped: 48
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23 Sep 2005 15:52 Re: driving power led |
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Hello
For power efficiency use Buck switch regulator with current feedback loop
All the best
Bobi
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