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Old 02-12-2012, 08:23 PM #97
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Johnyz:
Totally off topic. To 3D render, do you run the ULP for Eagle3D, and then render in PovRay?

If so, do you have to change the custom dorkbot colours every single time, or is there a way to set them as default?


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Old 02-12-2012, 08:47 PM #98
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Jubathoph, just make sure any signals you put on the enable pin aren't more than 0.3v greater than the input voltage. Input voltage + 0.3v is the max voltage. You definitely couldn't use 5v signals, but 3.3v signals should be fine.
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Old 02-13-2012, 07:05 AM #99
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

rhd: Not completely off topic I'd say, but oh well... Yes, I run the ULP and render it with PovRAY. I too need to change the colors... Figuring them out was a little challenge too. Buy maybe if you try messing with the Eagle3D config files it might be possible to set it as default.
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Old 02-14-2012, 02:15 AM #100
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Is this driver capable of getting its ground in through the diode like the Flexdrive?
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Old 02-14-2012, 03:16 AM #101
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Quote:
Originally Posted by jake642 View Post
Is this driver capable of getting its ground in through the diode like the Flexdrive?
That has nothing to do with the driver.
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Old 02-14-2012, 04:15 AM #102
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

I think he meant to ask if you can use the GND as continuous in this driver like you can with the FlexDrive. In this case, the answer is no, unfortunately. (I think.)
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Old 02-14-2012, 04:52 AM #103
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Quote:
Originally Posted by Wolfman29 View Post
I think he meant to ask if you can use the GND as continuous in this driver like you can with the FlexDrive. In this case, the answer is no, unfortunately. (I think.)
I don't think that's what he meant. If the diode has an isolated case pin (and I can't think of a diode that you'd be boosting voltage to drive that doesn't) then continous GND doesn't matter.
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Old 02-14-2012, 09:19 AM #104
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Great driver there guys.

I am just wondering what's the input current draw?
Is it below 2A ?

awesome work
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Old 02-14-2012, 10:57 AM #105
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Yep, the ground is NOT continuous with LM3410 designs because of the current feedback.
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Old 02-14-2012, 11:42 AM #106
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

If they are going to sell for 10$ i would buyy +1 to both of ya!
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Old 02-14-2012, 12:07 PM #107
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Quote:
Originally Posted by Tech_Junkie View Post
I know this is open source, but please dont let the Chinese get the list of components. Best to keep in house.
There is no danger of the Chinese copying this Driver....
Except for the addition of Q1 and C3 this same Driver
circuit is on page 19 of the LM3410 Data Sheet.

http://www.ti.com/lit/ds/symlink/lm3410.pdf


This brings up another issue about the disclaimer on the 1st
post....

A little disclaimer: You are free to make and use these drivers
as you please, but you do not have the right to SELL these drivers
without my or Rhd's permission.


Since the circuit that is in the Data Sheet Application was
designed by a TI Electronics Engineer you cannot prevent
anyone from building and selling this Driver Circuit since
Texas Instruments owns that circuit and they allow anyone
to use it.

What you can do is control the use of the exact PCB that
you designed...


Jerry

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Old 02-14-2012, 02:31 PM #108
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Also, why did you make this just a boost converter?

The datasheet has designs for SEPIC topology, which is effectively the same as buck boost. The only differences are stability (SEPIC is better in most respects) and output voltage polarity (I believe buck boost outputs negative voltage from positive voltage, while SEPIC outputs whatever the input voltage is).

If someone made a SEPIC converter with this IC then you could make some decent monies, since it'd effectively be a much cheaper flexdrive. Just putting that out there.


Also, why not just test one to see if the ground CAN be continuous? I think it should be, I don't see any reason why it wouldn't.
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Old 02-14-2012, 02:33 PM #109
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

SEPIC topologies are a lot harder to make efficient... and they require either two inductors or a double-tapped inductor, both of which would make it much more expensive/size-consuming.
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Old 02-14-2012, 02:35 PM #110
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

If they make an inductor that has two identical windings on it, then it's not a problem. There doesn't need to be any double tapped or double inductors.
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Old 02-14-2012, 02:37 PM #111
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

That's what I was referring to. But then the inductor requires double the saturation current (or some constant times the saturation current - forgot what it was). Point of the matter is that the inductor gets A LOT bigger.
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Old 02-14-2012, 02:46 PM #112
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Default Re: FREE DIY open source BOOST driver!!! Tested & working!!

Not that much bigger. I was looking around for inductor design choices for SEPIC converters, and found that most inductors at around 250 kHZ require 2.4 amps max saturation current total. The one that is chosen for the boost converter can handle 3.4 amps without saturation. So, it can't be that much more expensive to get a dual winding inductor at 10 uH, that can handle that much saturation current.
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