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AMC7135 - building a 445nm

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mpmsfilho

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Hi, I was searching in a lot of topics but I didn't found the answers of my questions, so I will post here a some questions:

1 - Is possible to power my 445nm diode (A140) with a 4.5v battery (amc7135 driver)?

2 - Is possible to build my flashlight in these way? ":

| Diode = AMC7135 = Switch + Battery - |

Thanks
 





Rafa

Rafa

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You probably won't be able to power it from only 4.5V.
Why don't you buy a switching driver? They are far better than linear.
 
Leodahsan

Leodahsan

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many people use the AMC7135, marcelo. But it will require heatsinking and many of them will be required to full charge (at least 3 or 4 DX AMCs)...

you will need to build this way:
| Diode = filter cap = AMC7135 = filter cap = Switch + Battery - |
you will need to ask other members about the filter capacitors.. they will protect your diode from damage.
:)
 
Rafa

Rafa

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Leodahsan said:
many people use the AMC7135, marcelo. But it will require heatsinking and many of them will be required to full charge (at least 3 or 4 DX AMCs)...

you will need to build this way:
| Diode = filter cap = AMC7135 = filter cap = Switch + Battery - |
you will need to ask other members about the filter capacitors.. they will protect your diode from damage.
:)
Click to expand...

Anything above 4.7uF will work just fine.
 
Jimmymcjimthejim

Jimmymcjimthejim

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I've read that you cannot use capacitors with the AMC7135, but I have no verification of this myself. So I wouldn't use it.
I used a 700mA AMC board to power a 445nm laser of mine. Using one lithium battery (4.2V) it does not get maximum power, but two lithium batteries is able to power the laser to 700mA.
At 4.5V, I would recommend to use only one AMC7135 (350mA) for stability reasons. Otherwise, you need a micro-flexdrive to power your laser.
Also, since the AMC driver is case positive, you need to reverse the polarity of the battery, making the laser case positive.
 
Jimmymcjimthejim

Jimmymcjimthejim

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I actually never tested the heat dissipation of the driver. It is thermally connected to the heatsink through a silicone pad, but then again I never tested the thermal conductivity of that either. The good news though is that I haven't had any problems with the laser yet, so I doubt that I am overheating the AMC chips.
 
M

mpmsfilho

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I tried to power my 445nm with the AMC7135 and has everything alright (4,5v) but the amc7135 has too hot! I'll use a heatsink, thanks.
 
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