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Old 03-21-2012, 01:10 AM #65
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Default Re: Presale: The Ben Boost

Quote:
Originally Posted by rhd View Post
I would actually REALLY like to know if there's anyway to get a TO-252 based 1085 linear to hang in (even heatsinked) at 1.8A for more than 45 seconds or 1 minute. When the TO-252 is on a driver PCB, you can't directly heatsink the metal tab of the IC to the host. Without that ability, I haven't found any way to get such a driver to live past the 1 minute mark.



Hosts and batteries. If you're building a tiny host with a single CR2 or 10440 cell, there's no wisdom in shooting for 1.8. You won't be able to draw nearly enough current to boost up to 1.8A of output. Probably not even enough to boost up to 1.1A.
A good way to heatsink them is to take a pre 1982 US penny (or if there are any copper canadian coins) or a similar piece of copper and cut it into a square about the width of the chip. About an eighth of an inch from one of the side bend a 90 degree angle (this will take a strong vice). Lay it on top of the regulator (with some arctic silver under it if you want) with the bent edge facing down, so that it sits on top of metal tab of the IC. Solder it on to the tab and then use this copper piece to heatsink it (but it obviously has to be insulated from case neg now).

I don't have any real hard data saying that method is better than just heatsinking the plastic, but it seem logical to me that a metal to metal connection is going to be much better than metal to plastic even if it has to travel up that copper a bit first.


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Old 03-21-2012, 01:30 AM #66
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Default Re: Presale: The Ben Boost

I see that now with the math just add up the 4 resisors instead of 2.

I have saved all my good copper over the years I have old water cooling blocks I can cut up and salvage! No one wants that stuff anymore... I also baught a bunch of copper ramsinks somewhere along the way just waiting for adhesive now. Who is the Battery Guy???

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Old 03-21-2012, 01:36 AM #67
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Default Re: Presale: The Ben Boost

Quote:
Originally Posted by benmwv View Post
A good way to heatsink them is to take a pre 1982 US penny (or if there are any copper canadian coins) or a similar piece of copper and cut it into a square about the width of the chip. About an eighth of an inch from one of the side bend a 90 degree angle (this will take a strong vice). Lay it on top of the regulator (with some arctic silver under it if you want) with the bent edge facing down, so that it sits on top of metal tab of the IC. Solder it on to the tab and then use this copper piece to heatsink it (but it obviously has to be insulated from case neg now).

I don't have any real hard data saying that method is better than just heatsinking the plastic, but it seem logical to me that a metal to metal connection is going to be much better than metal to plastic even if it has to travel up that copper a bit first.
I just got these

Amazon.com: XBRdepot 1 Pack of 4 Premium Self-Stick Copper Heatsinks for XBOX 360 RAM ANA and Southbridge Cooling (4 individual PCS): Video Games


And these...

Laptop GPU CPU Heatsink Copper Shim Pccooler MC-200 | eBay

The Amazon versions look small enough to fit in most hosts. The eBay versions would need to be cut in half.
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Old 03-21-2012, 01:47 AM #68
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Default Re: Presale: The Ben Boost

OMG you have no idea what you have found!!! exactly what I was looking for to cool this graphix card...

Thx tsteele

I hate making something I can buy cheaper~!

Peace!
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Old 03-21-2012, 01:49 AM #69
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Default Re: Presale: The Ben Boost

are they acctually shims or are they just sinks?
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Old 03-21-2012, 02:05 AM #70
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Default Re: Presale: The Ben Boost

Quote:
Originally Posted by tsteele93 View Post
I just got these

Amazon.com: XBRdepot 1 Pack of 4 Premium Self-Stick Copper Heatsinks for XBOX 360 RAM ANA and Southbridge Cooling (4 individual PCS): Video Games


And these...

Laptop GPU CPU Heatsink Copper Shim Pccooler MC-200 | eBay

The Amazon versions look small enough to fit in most hosts. The eBay versions would need to be cut in half.
Just sticking those on isn't going to to much to a 1085 running at 1.8A.

Here is a pic I drew real quick of what I mean't.
Grey is the heatsink, copper piece is brownish color, beige is thermal compound, dark grey is solder.
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Old 03-21-2012, 02:12 AM #71
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Default Re: Presale: The Ben Boost


Untitled by tsteele93, on Flickr

And


Untitled by tsteele93, on Flickr

If that helps.

P.S. Ben, I understand what you are saying. I'm not looking to use these by themselves on a build like that, but I am hoping to use them to bulletproof lesser builds. I'm even willing to try and connect them to the host if it will help and not short.
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Old 03-21-2012, 02:14 AM #72
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Default Re: Presale: The Ben Boost

Ben's idea might work, though it's a bit of a hassle. But short of Ben's idea, I would actually question whether anyone has actually been able to get a Jib77, Mohgasm, or similar 1.8A driver based on a PCB that uses a TO-252, to actually run for 2 minutes, even WITH heatsinking. I took a TO-252 driver and heatsinked it (with arctic silver) to a solid piece of aluminum that weighs 3 pounds. Thermal limiting still kicked in around 1 minute.

Basically, what I'm asking is:

- Can anyone actually show me a build where these 1.8A, TO-252 based designs can work? For 2 minutes?

My TO-252 designs sure can't. So either the TO-252 package 1085 ICs I bought from Kiyoukan can't handle their heat as well as the others, or this notion of using TO-252 parts in 1.8A drivers doesn't work. Considering how many TO-252 based 1085 drivers have been sold on this forum, there must be data on this, no?
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Old 03-21-2012, 02:18 AM #73
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Default Re: Presale: The Ben Boost

and the top view? lol Sorry Ben... 2 dimentions only work for thouse that see it in 3... :Beer:
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Old 03-21-2012, 02:30 AM #74
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Default Re: Presale: The Ben Boost

Sorry rhd, I cant help you there. I've yet to run one of these at 1.8A, but I do have the parts in my next digikey order.

Quote:
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and the top view? lol Sorry Ben... 2 dimentions only work for thouse that see it in 3... :Beer:
Side view is the only one that is relevant. Looking from the top you would just see a square of aluminum...
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Old 03-21-2012, 04:06 AM #75
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Default Re: Presale: The Ben Boost

ok then a front view? are these shaped like a wedge???? Is it a copper Shim or just a 2 dimentional heat sinc?
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405nm PHR-805T UniqueFire A10-B 100ma mogasm linear
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445nm A140 1.35A 1.7W guidesman with G2
445nm 2.5W+ G-2 H1600 in a copper axis 1800ma Mogasm linear 2x AR16340's in a guidesman
445nm 9mm Blitzbuck V3 2.8A Saik 2.9W
445 800mw 9mm in a RHD MOD9 a pollished stainless auraura sh-032 667ma benboost
450nm Osram PL450 301mw in a powerlight B50 Host 400ma microboost
450nm Osram PLTB450 1.7W in a Bigboy Host 1650ma FMT driver
532nm 80mw DPSS DIY info to follow
532nm 50mw DPSS module LASERSMAN Freeby review to follow...
638nm mits300 671ma 500mw C6 cree
638nm mits500 WF-501B 1150mw
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Old 03-21-2012, 04:09 AM #76
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Default Re: Presale: The Ben Boost

Soz!!! Didnt want to sound rude!
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Old 03-21-2012, 05:20 AM #77
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Default Re: Presale: The Ben Boost

Holy crap those parts are tiny! That's exactly why it's worth it to me to pay someone who has the right equipment and skills to build them.

Quote:
Originally Posted by Fretwrecker94 View Post
Just curious as I can't really tell from schematics I've seen... Does this driver use a constant negative?
I forget where in the thread about the design of the driver but when someone else asked the answer was no it does not. In the case of a 445 build you could use the case pin to get a ground for the Vin side.
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Old 03-21-2012, 05:41 AM #78
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Default Re: Presale: The Ben Boost

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Originally Posted by tsteele93 View Post
I just got these

Amazon.com: XBRdepot 1 Pack of 4 Premium Self-Stick Copper Heatsinks for XBOX 360 RAM ANA and Southbridge Cooling (4 individual PCS): Video Games


And these...

Laptop GPU CPU Heatsink Copper Shim Pccooler MC-200 | eBay

The Amazon versions look small enough to fit in most hosts. The eBay versions would need to be cut in half.
Try to keep in mind the main goal of heatsinking the driver is to move the heat into the host body. If you don't plan on attaching the sink to the host body after you attach it to the driver then you are buying yourself only a few seconds more before it overheats. I only mention this as the heatsinks you linked to look designed to be air cooled by a fan which in an insulated host it might as well be solid not finned.

On a Flexdrive set to 1.5A Jay and I tried to work this out with isolated heatsinks. We even got up to one this size.




And it only took us from a 15 second run before thermal protection kicked in to a 30 second run. But as soon as we started to sink them to the host bodies then we got our first unlimited driver duty cycles.

Flexdrive Driver Heatsink for Continuous driver duty cycle @ 1.5A


Last edited by DTR; 03-21-2012 at 05:43 AM.
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Old 03-21-2012, 06:27 AM #79
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Default Re: Presale: The Ben Boost

Got the "busy" side finished on all the drivers today. I think I fried my brain with the boring repetitive motions of assembling these. As i prepped all 2,300 pads with solder paste using a 24 gauge iv catheter, and place all 800 components with tweezer.

I just have to place the inductors tomorrow and i'll be ready to start packaging orders.

rhd, I didn't get a chance to test the 1.8 today. I'll see if I can get to it pretty soon and post a video of what i get.
I'll try the regular boards, and the round boards and see if there is a difference in the run times before they shut themselves off
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Old 03-21-2012, 05:37 PM #80
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Default Re: Presale: The Ben Boost

Quote:
Originally Posted by Mohrenberg View Post
rhd, I didn't get a chance to test the 1.8 today. I'll see if I can get to it pretty soon and post a video of what i get.
I'll try the regular boards, and the round boards and see if there is a difference in the run times before they shut themselves off
Awesome!

BTW - I'm curious - wouldn't it be way easier to reflow on all the inductors first, and then do the component side last?
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