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Old 11-19-2012, 09:14 AM #33
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Default Re: two drivers in parallel to make 1.8a?

Quote:
Originally Posted by ryansoh3 View Post
Interesting... mine was the 2.0A driver from DX here: 5-Mode P7 LED Driver Circuit Board for Flashlight (17mm / DC 5.0~17V) - Free Shipping - DealExtreme
(now sold out)

It was rated at 2000mA, but actually delivered 2.3A or so, so I had to swap out the sense resistor with a higher value.

Do you remember what driver you used?

Cheers!
yes I was talking about this one:

18V 5W Cree Circuit Board for Flashlights (16.8mm*5.5mm) - Free Shipping - DealExtreme


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Old 11-19-2012, 08:27 PM #34
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Default Re: two drivers in parallel to make 1.8a?

Foulmist, i can`t find a SMD resistor of ~0.15ohm here.

What`s the calculation of the resistor? I think i can find a 1ohm smd but i don`t know how to calculate the output current...
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Old 11-20-2012, 05:26 AM #35
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Default Re: two drivers in parallel to make 1.8a?

Quote:
Originally Posted by luccax View Post
Foulmist, i can`t find a SMD resistor of ~0.15ohm here.

What`s the calculation of the resistor? I think i can find a 1ohm smd but i don`t know how to calculate the output current...

you can find smd resistors in farnell or digikey or other electronics webstore.

the current is calculated I = 0.25 / R for the dx driver I referred to.

you can stack some smds on top of each other in parallel if you can't find the exact value you are looking for..

here is a great resistor calculator in parallel

PARALLEL RESISTOR CALCULATOR
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Old 11-20-2012, 06:26 AM #36
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Default Re: two drivers in parallel to make 1.8a?

SMD resistors with low ohms are slightly hard to find here too. They only send them in quantities of 100 and the price is $10, so not that cheap considering you only need one.

I have two spare 1206 0.15 Ohm resistors, so if you're having trouble finding them, PM me.

Cheers!
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Old 11-20-2012, 04:51 PM #37
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Default Re: two drivers in parallel to make 1.8a?

First thing i think was worth studying at school: 1/R1 + 1/R2 = 1/Req

THanks for the offer ryan, i'll search local stores tomorrow and if i don't find it i guess i'll have to ask you for one!
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