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Cooling problem?
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#1 (permalink)      12/2/2014 11:33:12 AM US Central   quote/reply + tips
erwins_cat
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Cooling problem?
Hi,

apparently, on of my AMC7135 chips is overheating (with heat sink attached) and shuts down to cool off and then switch on again. Has anyone else cooling problems with them? Any recommendation for cooling them?
#2 (permalink)      12/2/2014 11:49:12 AM US Central   quote/reply + tips
rtype11
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I use amc7135 *8 drivers only, all different ones, several i have removed all 350mA current drivers and replaced with 380ma *12 and still no overheat issues or shut down, i would look at battery or continuity issues first.
Make it idiot proof and someone will make a better idiot
#3 (permalink)      12/2/2014 11:56:35 AM US Central   quote/reply + tips
erwins_cat
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Additional note: the AMC7135 is powered with 5V power supply (which drops to 4.5V @ 1400mA). Battery or continuity issues can be excluded. Is the higher voltage than usual (3V vs. 4.5V) be the problem? Fasttech says it works from 3-5V, the data sheet even 2.7V to 6V.
#4 (permalink)      12/3/2014 2:48:45 AM US Central   quote/reply + tips
erwins_cat
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Apparently, my guess was right, the AMC7135 is overheating when applying higher voltages, it simply burns the voltage difference needed for the LED's. Plugged in two diodes to burn the voltage difference elsewhere and it works like a charm even without cooling for the AMC7135.
#5 (permalink)      12/3/2014 2:48:46 AM US Central   quote/reply + tips
erwins_cat
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*douple post*

Edited on 12/3/2014 at 2:49 AM. Reason:
#6 (permalink)      12/14/2014 2:37:15 PM US Central   quote/reply + tips
Buwuve
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Which diodes do you built in? Is it available here on Fasttech? Maybe it will help other users, too.

I use this driver with 1x 18650 and add one 7135 more on it (with 1,75A it works good, but after 15 minutes the body of the flashlight was really warm).
#7 (permalink)      12/14/2014 2:42:59 PM US Central   quote/reply + tips
erwins_cat
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yes, the diodes available here, one 1N5822 and one 6A10.