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Old 10-11-2011, 11:22 PM #1
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Question AMC7135 driver question

Hi!

Quality AMC7135 350mA Regulated Circuit Board for DIY Flashlights 20-Pack - Free Shipping - DealExtreme

I want to use some of this drivers in my LOC builds but i have to figure out a way to ajust the output properly.

The output of this driver can be changed by adding IC`s in parallel. To drive the 826 diode i need 500mA. So with the stock driver i get 350mA and with two ICīs i get 700mA.
What should i do to get 500mA?

Also, that driver seems poor in components. Should i use a capacitor across the diode?

thanks!


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Old 10-12-2011, 12:24 AM #2
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Default Re: AMC7135 driver question

Short answer, you can't.

There's no way that I've come across to reasonable achieve current in between the 350mA increments.

They're also annoying drivers to use for LOC builds because they don't have a common (-), and LOCs are case (-).
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Old 10-12-2011, 01:33 AM #3
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Default Re: AMC7135 driver question

Thatīs not what i want to hear xD

What if i used two IC`s to get 700mA and then add a res on the in or output to limit the current? would that work?

sorry what you mean by common - ?

What about this driver?

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Old 10-12-2011, 01:37 AM #4
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Default Re: AMC7135 driver question

Quote:
Originally Posted by LuxorLasers747 View Post
Thatīs not what i want to hear xD

What if i used two IC`s to get 700mA and then add a res on the in or output to limit the current? would that work?

sorry what you mean by common - ?

What about this driver?

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1) Nope, that won't work.

2) By common, I meant continuous

3) Nope, the VIn can't be higher than the Vout for that driver. So no luck here either.
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Old 10-12-2011, 02:03 AM #5
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Default Re: AMC7135 driver question

Could you tell me why not? i think i saw a guy on youtube doing that with a pot i guess xD (not the same driver though)

Oh so if its not continuos the diode would have to be insulated from the case right?

on your mosquito build did you use a AMC 7135 based driver?

I ran out of ideas. Could you point me a driver that can do 500mA from one li-on? the flex`s are on vacations..
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Old 10-12-2011, 02:33 AM #6
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Default Re: AMC7135 driver question

Quote:
Originally Posted by LuxorLasers747 View Post
Could you tell me why not? i think i saw a guy on youtube doing that with a pot i guess xD (not the same driver though)

Oh so if its not continuos the diode would have to be insulated from the case right?

on your mosquito build did you use a AMC 7135 based driver?

I ran out of ideas. Could you point me a driver that can do 500mA from one li-on? the flex`s are on vacations..
500mA is actually pretty tough on one cell without going buck driver. The challenge is that at 500mA, a LOC will require too much voltage for a DDL style driver to provide from one cell, once the 1.25V resistor drop is factored in, plus the IC's dropout voltage.

I don't have a solution for you I'm afraid. In fact, there was a whole thread about this tough current/voltage/battery combination. It's hard to DIY.
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Old 10-12-2011, 02:51 AM #7
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Default Re: AMC7135 driver question

I see.. The only reason u maneged to build your mosquito was because the volage of the 635 is lower comparing to locs?

So the only way is to wait for the flex then (if i want to use one li-on). Why are they out of stock for soooo long?
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Old 10-12-2011, 03:05 AM #8
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Default Re: AMC7135 driver question

Quote:
Originally Posted by LuxorLasers747 View Post
I see.. The only reason u maneged to build your mosquito was because the volage of the 635 is lower comparing to locs?

So the only way is to wait for the flex then (if i want to use one li-on). Why are they out of stock for soooo long?
Nope, the Mosquito was luck, in the sense that it just so happened that the optimal current for a Mitsubishi 635 is 1050 (a perfect multiple of 350).
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Old 10-17-2011, 05:32 PM #9
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Default Re: AMC7135 driver question

7135 are like little gates, only letting 350mA through. Caps are suggested, I've blown an LOC by driving it with a 7135 float-soldered between the wires. I don't have a scope, so I don't know if the 7135 was to blame or simply the very real possibility of static.
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Old 10-17-2011, 07:07 PM #10
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Default Re: AMC7135 driver question

Quote:
Originally Posted by BShanahan14rulz View Post
7135 are like little gates, only letting 350mA through. Caps are suggested, I've blown an LOC by driving it with a 7135 float-soldered between the wires. I don't have a scope, so I don't know if the 7135 was to blame or simply the very real possibility of static.
Agreed.

In fact, the early datasheets on the 7135 suggested one cap. If you look at the most recent revision, it actually recommends two.

That said, even the latter datasheet (and thus presumably most drivers based on the amc7135) doesn't place a cap in parallel with the LD.

There's a cap between V(+) and GND, and then between LD(-) and GND. But there's no cap between LD(-) and LD(+).

I'm admittedly not familiar enough with the regulator to know if a cap across LD(-) and GND accomplishes the same filtering objective as a cap across LD(-) and LD(+) would.
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Old 10-17-2011, 07:17 PM #11
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Default Re: AMC7135 driver question

You could just use one amc7135 chip to drive 350mA current. That not shabby for a red laser.
or you could use a lineair driver like this,
FS: Jib Drivers 1.25A & 1.8A
it has a lower voltage drop than a standard LM317 driver. Setting current is the same as LM317, 1.25V=I.R
Remove both the soldered 1Ohm resistors and replace it by a 2.5Ohm resistor. That gives 500mA current.
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Old 10-17-2011, 09:04 PM #12
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Default Re: AMC7135 driver question

You could dump the extra 200mA over a resistor (~15Ω 1W I think) in parallel to the laser diode, but that wouldn't be very efficient
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Old 10-17-2011, 09:16 PM #13
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Default Re: AMC7135 driver question

Quote:
Originally Posted by Cyparagon View Post
You could dump the extra 200mA over a resistor (~15Ω 1W I think) in parallel to the laser diode, but that wouldn't be very efficient
That's interesting.

In theory, if I wanted a 600mA driver for a 405nm 12x, that would handle a source of 2x lithium ions, I could use 2x AMC7135s after all.

With a 60 ohm resistor parallel (perhaps right on the PCB) with the LD outputs, it would divert around 100mA from the 700mA output, and leave 600mA for the LD?

Of course, I'd need a 1W resistor (or 0.75 at least), but it should work.
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Old 10-18-2011, 10:08 AM #14
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Default Re: AMC7135 driver question

Good idea to use a shunt resistor to route the current around the laser diode.
For 500mA drive current at 6V(?) the resistance of the laser diode would be 12 Ohm and require a 30 Ohm resistor with min 1.2W to shunt the not needed 200mA current from the 2x7135 driver. For 600mA current this would require a 60 Ohm resistor, as rhd has stated.
But, considering all the part tolerances and temperature effects I would in any case add some safety margin!
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Old 10-19-2011, 07:03 PM #15
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Default Re: AMC7135 driver question

FYI, just because download used an LED to drop the Vin voltage down, doesn't mean that you can't use a regular diode. However, it would make a nifty AND functional "laser ON" indicator ;-)

Last edited by BShanahan14rulz; 10-19-2011 at 07:05 PM.
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