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Old 08-06-2012, 12:09 AM #1
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Default square buck-boost driver (TPS63020 and LT6106)

This is the 12.8x12.5mm square version of my driver






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square buck-boost driver (TPS63020 and LT6106)-driver.jpg  



Last edited by laserluke; 09-04-2012 at 09:35 PM.
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Old 08-06-2012, 01:32 AM #2
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Default Re: square buck-boost driver (TPS63020 and LT6106)

Looks great!
Size is pretty awesome for such a powerful driver also, looks like all components are on one side, I know the bottom is the ground but maybe oh can get it even tinier by putting a few components on the bottom

By just getting the Pot & inductor underneath you'll have a micro sized 2Amp + buck boost
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Old 08-06-2012, 01:49 AM #3
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Default Re: square buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by AnthoT View Post
Looks great!
Size is pretty awesome for such a powerful driver also, looks like all components are on one side, I know the bottom is the ground but maybe oh can get it even tinier by putting a few components on the bottom

By just getting the Pot & inductor underneath you'll have a micro sized 2Amp + buck boost
Thanks
With components on both sides, the problem become the heat dissipation because you need a good thermal contact between TPS63020, the inductor and the heatsink...

Last edited by laserluke; 08-06-2012 at 01:51 AM.
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Old 08-06-2012, 01:53 AM #4
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Default Re: square buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by laserluke View Post
Thanks
With components on both sides, the problem become the heat dissipation because you need a good thermal contact between TPS63020 and the heatsink...
yeah, well i was thinking if you did put them on both sides then you could really have the best driver at the moment, its already awesome & weve seen that already with your 17mm version

cant we just heatsink the TPS63020 directly, not through the board. i think its worth a shot to see just how tiny this thing can get

do you have the eagle files, i would be willing to edit them right now to try and make it as small as i can then ill post back the gerbers & hopefully dont wreck anything
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Old 08-06-2012, 02:02 AM #5
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Default Re: square buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by AnthoT View Post
yeah, well i was thinking if you did put them on both sides then you could really have the best driver at the moment, its already awesome & weve seen that already with your 17mm version

cant we just heatsink the TPS63020 directly, not through the board. i think its worth a shot to see just how tiny this thing can get

do you have the eagle files, i would be willing to edit them right now to try and make it as small as i can then ill post back the gerbers & hopefully dont wreck anything
The TPS63020 thermal pads are located below the package. You have a very poor thermal contact (and a bad working driver...) if you place an heatsink above the plastic package.

Last edited by laserluke; 08-06-2012 at 02:06 AM.
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Old 08-06-2012, 02:25 AM #6
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Default Re: square buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by laserluke View Post
The TPS63020 thermal pads are located below the package. You have a very poor thermal contact (and a bad working driver...) if you place an heatsink above the plastic package.
Yeah that makes more sense...

Still a great driver though
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Old 08-06-2012, 05:28 AM #7
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Default Re: square buck-boost driver (TPS63020 and LT6106)

Great, I was thinking of making it double sided but I am not sure of the heatsinking issue.

Perhaps I will give it a shot when I can order some proto boards. I am really tired of making my own etching. It's a pain for double sided
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Old 08-06-2012, 10:45 AM #8
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Default Re: square buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by foulmist View Post
Great, I was thinking of making it double sided but I am not sure of the heatsinking issue.
There is a simple solution for this doubt. Place a thermometer in good contact with the central via below the TPS63020, set the current to the desired value (1.8A or more) and measure the final temperature at the equilibrium.
The junction-to-board thermal resistance of the TPS63020 is 17C/W so the junction temperature will be 17C higher than your measure.
The absolute maximum temperature permitted for the junction is 150C and the TPS63020 internal protection is programmed at 140C so, at this temperature threshold, the IC stops operating.
Note for AnthoT: the junction-to-top-case thermal resistance of the TPS63020 is 47C/W while the junction-to-bottom-case is 3.6C/W !!! (place an heatsink on the top of the package is not a good idea...)

Last edited by laserluke; 08-06-2012 at 11:05 AM.
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Old 08-06-2012, 01:24 PM #9
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Default Re: square buck-boost driver (TPS63020 and LT6106)

Looks very good, its just great to have so many drivers coming up like that, i remember not so long ago we wondered if we will ever have our own boosts like the flex v5 now guess what this is much better and is much more capable 2A
+1 to you
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Old 08-06-2012, 02:35 PM #10
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Default Re: square buck-boost driver (TPS63020 and LT6106)

Yeah Luke that makes sense
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Old 08-22-2012, 04:44 AM #11
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Default Re: square buck-boost driver (TPS63020 and LT6106)

So, is it possible to pwm these drivers? I read the ic has a set internal pwm at like 2.4mHz? Would that mean no? I would just like the most control over these as possible.
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Old 08-22-2012, 05:40 AM #12
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Default Re: square buck-boost driver (TPS63020 and LT6106)

Quote:
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So, is it possible to pwm these drivers? I read the ic has a set internal pwm at like 2.4mHz? Would that mean no? I would just like the most control over these as possible.
you can in several ways..

easiest - through the enable pin you have a miximum of around ~530Hz frequency. Any higher than that would be a constant on.
you can use a pwm signal like in my build I made to control the brightness
HERE

best way would be to PMW the output but that would need some changes to the board and additional components. Then you can have higher frequencies to modulate the output.

Last edited by foulmist; 08-22-2012 at 05:41 AM.
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Old 08-22-2012, 05:46 AM #13
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Default Re: square buck-boost driver (TPS63020 and LT6106)

WOW! I was working on a driver using the same IC and current sense amp!

Mine was gonna be double sided though...





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Old 08-22-2012, 06:01 AM #14
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Default Re: square buck-boost driver (TPS63020 and LT6106)

haha I have a double sided design too still to be tested though!
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Old 08-22-2012, 11:25 AM #15
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Default Re: square buck-boost driver (TPS63020 and LT6106)

So you would suggest just using the enable pin on the ic with a 555 set up?

I don't want anything visibly slow, or anything really fast. Just a noticeable difference

Last edited by flare09; 08-22-2012 at 11:26 AM. Reason: More info
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Old 08-22-2012, 01:41 PM #16
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Default Re: square buck-boost driver (TPS63020 and LT6106)

if your designs are very similar to OP's why not post them here for everyone's benefit?
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