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Old 05-27-2013, 01:44 PM #1281
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Snowluck,

One look at it tell me the work is done in a hurry. Very poor workman ship, unskilled work.
Watch some videos in u tube. You can use a suitable iron to do the work. It will be messy to unsolder and try again. Start a new , one component at a time. Use a bare minimum Paste and solder. There appear to be many shorts.
good luck.


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Old 05-30-2013, 04:10 AM #1282
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

You can also use paste and stick an iron on the heat sink pad to reflow it all. This will let you monitor the process and move any components while the solder is melted if needed
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Old 05-30-2013, 01:39 PM #1283
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Mohrenburg,

you are 100% correct.
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Old 10-18-2013, 10:04 PM #1284
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Long time lurker, first time poster....

I want to combine two of the mini's onto one PCB, with one set of input and output tabs. What components (if any) could I make common?

I'm assuming the external FET is for reverse polarity protection so there's that. What about the output capacitors? Input Cap?

Any advice would be greatly appreciated

- Matt

EDIT: Oh, and is there any particular reason why such large SMD components were used? I would like to use all 0603 parts where applicable and I figure provided they have the same specs everything should work fine?

Last edited by mattaus; 10-18-2013 at 10:17 PM.
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Old 01-04-2014, 12:26 AM #1285
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

I am having an odd problem, the driver works, however it outputs 300ma nomatter what value sense resistor I use. Has anyone ever herad of this before or seen this?
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Old 01-04-2014, 02:31 AM #1286
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Quote:
Originally Posted by snowluck2345 View Post
I am having an odd problem, the driver works, however it outputs 300ma nomatter what value sense resistor I use. Has anyone ever herad of this before or seen this?
What's your input power source?
What are you driving? (if a test load, what is the configuration)
Where is the driver from, did you reflow it yourself, or purchase it?
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Old 01-04-2014, 02:34 AM #1287
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

My input power source is a 18650 cell at 4.1v

I'm driving an M140 Diode.

I reflowed it myself. I did a much better job this time than the one I posted here a year ago. I used a metcal hct2-120 hot air reflow station.
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Old 01-04-2014, 02:54 AM #1288
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Care to post a picture of the full setup? Although it sounds like a damaged lm3410 to me

Is this the sot-23-5 or the llp 3x3 version?

Try checking continuity between the Vin and LD+, if you get low R that's the problem.

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Old 01-04-2014, 03:09 AM #1289
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

It's the llp3x3

Thats unfortunate if that is the case, that's my last one in that package.

I left it at the lab, I'll foe back later tonight or tomorrow.

Low resistance means it's the lm3410?

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Old 01-04-2014, 04:01 AM #1290
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

If there is low resistance there power is just shooting through like no driver is present. Either because a blown chip or a short beneath the chip. You should try removing the IC the reflowing it again. If that doesnt work and you are sure there are no other problems then you will need another lm3410.

Correctly reflowing the llp 3x3 by hand is no small feat, it takes practice and preferably a solder paste stencil. You can check out OSHstencils I've heard they are good and cheap.
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Old 01-04-2014, 04:18 AM #1291
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

It is boosting the voltage so I assume that means that the driver is doing something.


I will look into Oshstencils. Depending on how long their shipping is I might just try making my own on a lasercam.

I can post pictures like you asked to show how the rest looks and see if there are any problems I missed that you might catch.

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Old 01-04-2014, 05:34 AM #1292
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Quote:
Originally Posted by snowluck2345 View Post
It is boosting the voltage so I assume that means that the driver is doing something.
It might not be boosting. If the IC is dead and the battery is in a direct drive connection to the diode, the diode might lase. If memory serves (it has been a while), the voltage of a full li-ion is sometimes enough to drive a 445 at low power. This would also explain the non-impact of resistor value changes.
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Old 10-12-2014, 04:40 PM #1293
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Hey guys,

Has anyone used the BenBoost Mini inside a C6 Host? If you have would you mind sharing how you went about that?

I'd like to use the mini in my C6 M140 build but don't know if it's worth thr trouble compared to just using the round one instead (without OVP).

Thanks, Nelly
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Old 11-22-2014, 04:18 PM #1294
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Necro post with a purpose - This is just a brainstorm. Is there any reason we couldn't add a MOSFET, with gate tied to the SW output on the LM3410, as a way of effectively bypassing the limitation of the internal switch (by not using it)?

I'll have to brainstorm on this for a bit, but this is what I had in mind. EDIT: modified since initial posting.


Looking at the datasheet diagram, there's an internal current sense on the output of the NMOS that we'd be bypassing. I don't think that matters because my guess is that it's just there to protect the NMOS, so the lack of substantial current across it shouldn't be an issue.

I think the external MOSFET needs to be a P-MOS in order to make the switching cycles work as expected, but I may be backwards on that. The example above would be an attempt to boost to 1.6A, which the LM3410 can't typically do otherwise.
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Last edited by rhd; 11-23-2014 at 07:21 AM.
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Old 11-24-2014, 04:03 AM #1295
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

I've thought about that before, actually I think I might be able to dig up a .brd of it on my old laptop from like 2 years ago. I'm pretty sure there is a data sheet (I dont think its was lm3410 specifically, but same idea) that has a mosfet in one of the designs to extend the range and I basically modeled after that. I'll try to find it.

Anyways, two things in your design there I think need to be changed for it to work.
1. Move the pull up resistor to the Vin (before the coil) so crazy spikes and ripple aren't running into the gate of the fet.
2. Change it to a 100 ohm. Because of how fast the device switches I'm 99% sure the 1M resistor won't let enough current through to saturate the gate quickly, resulting in it operating in the linear region (where it has not high, but not its lowest resistance either) majority of the time. Basically it will be trying to pass large amounts of current while it is very slowly (relative to the operating frequency at least) moving to its minimum resistance and when it's somewhere around order of 1ohm it will be burning so much power the thing will worst case pop, best case be wildly inefficient and low output. A 100 ohm resistor should be low enough to let it open quickly and efficiently while still only leaking like 40ma when it's connected to ground by the internal fet.


Also @ nelly little late, but yeah you can make a nice and cheap laser if you pop an m140 and a mini drive set to like 1.25A in c6. You'll get long runtimes, reliable, and enough power to wow all your friends. Just make sure you get some laser safety glasses.
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Old 11-24-2014, 04:52 AM #1296
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

If you find that circuit, let me know. But if not, I may toss something together and try it.

Other than your notes above, does my logic that it needs to be a P Mosfet, with Source connected to ground, make sense?
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