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Old 07-14-2010, 04:53 AM #1
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Default 4 LPC in parallel

Hello, I just want to know how I can drive 4x LPC-815 diodes at 240mAh but want to use only one driver, how can I do that?




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Old 07-14-2010, 01:13 PM #2
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Default Re: 4 LPC in parallel

by using 4 drivers set to 240mA, one driver for each doide?
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Old 07-14-2010, 02:01 PM #3
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Default Re: 4 LPC in parallel

Or have them in series, and supply the driver with 12V

Parallel is not recommended, because each diode will draw a different current.
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Old 07-14-2010, 07:40 PM #4
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Default Re: 4 LPC in parallel

I want to use only one driver.

Thanks
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Old 07-14-2010, 08:23 PM #5
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Default Re: 4 LPC in parallel

Then you want a Flexmod driver available (soon?) from Dr Lava

Wired in series with some resistors.
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Old 07-14-2010, 08:44 PM #6
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Default Re: 4 LPC in parallel

I'm not sure why you would need the resistors if you connect the diodes in series... Each laser module must be electrically isolated from the heatsink and each other to prevent them from shorting out.
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Old 07-15-2010, 07:41 PM #7
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Default Re: 4 LPC in parallel

Ok, I can use a AMC7135 with the diodes in parallel?
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Old 07-16-2010, 06:39 AM #8
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Default Re: 4 LPC in parallel

Don't use them in parallel, as you can't guarantee that each diode will receive an even amount of current. Even if it worked properly, the AMC7135 can only sink 350mA, so divided four ways would be only 88mA each.

Just buy one of Dr Lava's Microboost drivers, set it for 250mA, and connect it to the four laser diodes in series.
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Old 07-16-2010, 07:07 AM #9
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Default Re: 4 LPC in parallel

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Originally Posted by Bionic-Badger View Post
Don't use them in parallel, as you can't guarantee that each diode will receive an even amount of current. Even if it worked properly, the AMC7135 can only sink 350mA, so divided four ways would be only 88mA each.

Just buy one of Dr Lava's Microboost drivers, set it for 250mA, and connect it to the four laser diodes in series.
While that would work, FML raises a valid point.

It's easy enough to distribute current equally through the parallel diodes. A resistor in series with each diode.

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Old 07-16-2010, 09:08 PM #10
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Default Re: 4 LPC in parallel

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While that would work, FML raises a valid point.

It's easy enough to distribute current equally through the parallel diodes. A resistor in series with each diode.

That would not distribute the current evenly. Only voltage will be evenly supplied across them.

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Old 07-17-2010, 01:41 AM #11
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Default Re: 4 LPC in parallel

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That would not distribute the current evenly. Only voltage will be evenly supplied across them.

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No, it will distribute current evenly. While it's not perfect, it's pretty close.

All the diodes are the same, so we can say that the forward voltages of each one are within a small margin.

If V+ is a constant current supply, and the resistors are low value, say... 10ohms, then the current will be split evenly between the laser diodes.

The resistors act as a balancing device, in that if more current started to go through one diode, the resistor in series with it would have a higher voltage drop, encouraging more current to travel through the lower voltage circuits.

Like I said, it's not perfect, and it doesn't work with anything except identical diodes, but it does work.
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