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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > IR333-A Forward Voltage?

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essen	#1 05/12/2008 - 21h08 Top
Class : Apprenti Posts : 3 Registered on : 05/12/2008 Off line	Hi I need some help with the Forward Voltage and current mA value for the IR333-A 5mm 940nm LED's. I found the IR333-A datasheet here (PDF file) But I'm still not quite sure what values I should put in the Assembly Wizard. I tried with: 9V Battery for the power source (which I will use). 1.5 Forward Voltage. 80 mA Forward Current. Is that fine?
didja	#2 05/12/2008 - 21h29 Top
Class : Webmaster (admin) Posts : 1043 Registered on : 09/07/2007 Off line Www	Nope, it's not fine Not really easy to understand this datasheet Forward voltage is 1.5V (even if it's written 1.2V as "typ." voltage, I'd think 1.5V will do it). Forward current is only 20mA ! If you send them 80mA, I'd bet they'll fry ! If tristan68 passes by I guess he'll confirm what I said, but I think it's already all right Rémy
essen	#3 05/12/2008 - 22h32 Top
Class : Apprenti Posts : 3 Registered on : 05/12/2008 Off line	The truth is that I don't understand a shit from the datasheet. I'm just guessing not very good I though the maximum forward current was 100 mA, but after looking at the datasheet again I don't know where I got that number from. Is this LED really sufficient for FreeTrack or should I try to look for another type? Edited by essen on 05/12/2008 at 22h41.
didja	#4 05/12/2008 - 22h50 Top
Class : Webmaster (admin) Posts : 1043 Registered on : 09/07/2007 Off line Www	The view angle is narrow, but you can increase it by sanding flat the LED (see the hardware FAQ). Rémy
tristan68	#5 06/12/2008 - 19h28 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello Essen , Didja Sory for not been avail last days I've taken a look at the datasheet. The forward voltage you should use for your calculations is 1.2v, since its the min voltage at continuous current driving mode (not pulse drive). So even if your led has a little more than 1.2v forward voltage , your calcs will go toward security. About the forward current : it's 50mA for this led model. So don't exceed this value. Use the led wizard with the following values : Power supply voltage : 9v Power supply type : batteries Led forward voltage : 1.2v Led forward current : 50mA max. cya
essen	#6 06/12/2008 - 20h53 Top
Class : Apprenti Posts : 3 Registered on : 05/12/2008 Off line	Thank you tristan68 and didja, I appreciate your kindness and help.
didja	#7 06/12/2008 - 20h56 Top
Class : Webmaster (admin) Posts : 1043 Registered on : 09/07/2007 Off line Www	Hi tristan ! That's a luck you passed by, I said bullshit... Not really easy to understand those datasheets... Rémy

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > IR333-A Forward Voltage?

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