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Old 03-08-2014, 08:05 PM #1
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Default Basic Electronics Questions. AMC7135

Hey guys! I have been looking at low cost red builds lately, and the ML101U29-25 diodes have come up ($3 per diode)

These are rated at 400mw and a perfect current for these is 350ma. Coincidentally, the AMC7135 chip puts out 350ma! In a very compact package!

Anyways, the forward voltage stated on the ML101U29-25 datasheet is 2.35 - 3 volts (typ - max) so generally will have about 2.5 fV.

I want to use one cell. Maybe a 16340 or an 18650 etc. So input voltage will be 3.9 - 4.2 volts.

I have looked and looked. So i have two questions.

The Vf of the ML101U29-25 is slightly higher than the other mitsu diodes. Will it still work with a single cell?

What is the pin-arrangement for the AMC7135? The three pins from left to right and the GND pin on top?

Also, if i want to make a very compact red driver out of these chips, all i would need is the chip and a diode for reverse polarity protection? Feel free to shoot me if i am being really stupid with anything i say.

Any help with this would be greatly appreciated!

Thanks
-Matt


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Old 03-08-2014, 08:17 PM #2
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Default Re: Basic Electronics Questions. AMC7135

Yeah it will work have a look here:

DIY - The little red key chain...that lives!!*PIC HEAVY*

This was a simple red made from a DVD drive and one AMC chip. Ill try to find a simple circuit diagram.


Edit: here you go. http://laserpointerforums.com/attach...on-amc7135.png
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Old 03-08-2014, 11:09 PM #3
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Default Re: Basic Electronics Questions. AMC7135

Quote:
Originally Posted by grainde View Post
Yeah it will work have a look here:

DIY - The little red key chain...that lives!!*PIC HEAVY*

This was a simple red made from a DVD drive and one AMC chip. Ill try to find a simple circuit diagram.


Edit: here you go. http://laserpointerforums.com/attach...on-amc7135.png
Wow great! I kind of suck at reading schematics, so i have no idea what it says.

So the battery GND is attached directly to the GND tab/pin of the AMC, the battery+ and battery- are bridged with a capacitor with a value i do not know. And the diode attached to the GND and the Vout?

I just dont get why the diode in the schematic is attached to the Vout of the AMC and the battery+ where is the GND connection to the diode?

Thanks
-Matt
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Old 03-09-2014, 03:44 AM #4
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Default Re: Basic Electronics Questions. AMC7135

The negative of the diode is attached to the out pin of the AMC7135 because it is a regulated current sink. This means it serves as the load's (diode's) connection to ground, and only lets so much current flow to actual ground (battery negative). If only so much can flow out, then that same amount can only flow in. The capacitor there is known as a decoupling capacitor and any value above 0.1uF (100nF) will do. You want either ceramic, electrolytic, or PP "film/foil" type capacitors. If you use electrolytic make sure you mind the polarity. Aside from that, the battery positive goes to the Vdd (positive) of the chip and the positive of the diode, and yes the cap goes between the Vdd and Gnd of the chip.
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Old 03-09-2014, 04:08 AM #5
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Default Re: Basic Electronics Questions. AMC7135



This is my interpretation of the the earlier provided link. Sorry i only have Paint.exe right now as i just reinstalled my OS cause my SSD failed.

Is this correct?

Is the out pin the +LD input or is the Vdd the +LD input?

Thanks
-Matt
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Old 03-09-2014, 04:26 AM #6
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Default Re: Basic Electronics Questions. AMC7135

It looks correct as you have drawn it, but put the cap as close to the chip as you can. If you can put it directly across the chip between the Gnd and Vdd that is best. The more wire between the chip and the cap the worse it will perform.
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Old 03-09-2014, 06:06 AM #7
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Default Re: Basic Electronics Questions. AMC7135

You realize they are 400mW PULSE diodes right?
CW is like 150mW for them
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Old 03-09-2014, 06:30 AM #8
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Default Re: Basic Electronics Questions. AMC7135

Quote:
Originally Posted by crazyspaz View Post
You realize they are 400mW PULSE diodes right?
CW is like 150mW for them
These diodes have been tested at up to 400ma. 350ma is semi-conservative and puts out about 250mw with a G-2 lens.

So which goes to the laser diode +? The "OUT" or the "Vdd"

Also, how much do these need to be heatsinked? None right?

Thanks
-Matt
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Old 03-09-2014, 06:53 AM #9
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Default Re: Basic Electronics Questions. AMC7135

I bought 10 of these chips a while back, and let me say...they are frickin small. Be prepared lol
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Old 03-09-2014, 09:54 AM #10
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Default Basic Electronics Questions. AMC7135

Diode positive goes to battery positive or Vdd (electrically identical). Diode negative goes to chip out.

The chip will need minor heatsinking for long runtimes, nothing major.


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Old 03-09-2014, 11:38 AM #11
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Default Re: Basic Electronics Questions. AMC7135

Does anybody know how can I wire two AMC chips together?

Jim
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Old 03-09-2014, 11:42 AM #12
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Default Re: Basic Electronics Questions. AMC7135

Multiple chips are used in parallel, so you can simply stack a second chip on top of the first one. I wouldn't stack more than two for thermal reasons though.


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Old 03-09-2014, 01:37 PM #13
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Default Re: Basic Electronics Questions. AMC7135

Yup just put one on top of the other and attach with some thermal epoxy. Then solder a bridge between the pins. Dont worry about the middle pin as there is more room to connect that at the back of the chip (GND).Did this a while back to get near 6 A out of an AMC 3.05 A board! Also did some other mods on the same board to run an MT-G2 at 8.4 V. If you want further info Ill look up the relevant threads.
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Old 03-09-2014, 04:20 PM #14
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Default Re: Basic Electronics Questions. AMC7135

Just use this driver after removing two of the 4135 chips.

Check the pinout, but it is for a red LD.

OPEN Source: IRON4D Driver (single-cell on-diode Mits driver)

Be careful with the Red LD's they are sensitive to input surges.

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Old 03-09-2014, 04:35 PM #15
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Default Re: Basic Electronics Questions. AMC7135

Quote:
Originally Posted by LarryDFW View Post
Just use this driver after removing two of the 4135 chips.

Check the pinout, but it is for a red LD.

OPEN Source: IRON4D Driver (single-cell on-diode Mits driver)

Be careful with the Red LD's they are sensitive to input surges.

LarryDFW
Thanks larry, but i want to start building my own drivers and this is a good place to start.

And, meh, they are $3 diodes.

THANKS GUYS!!!!
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Old 03-09-2014, 05:23 PM #16
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Default Re: Basic Electronics Questions. AMC7135

@KRNAZNBOY I'm also in the process of designing my own driver...good luck my friend!

Jim
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