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Old 09-02-2010, 09:48 PM #1
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Default Heatsinking a Microboost

Hi all,

As we know, we are pushing these boost drivers, (I include the Flexdrive here), trying to run 445s at full bore from one 3.7V battery. This creates a lot of heat during the boost and I'm wondering what parts on the Microboost should be particularly cared for?

I have a build in progress and wish to know which side of the Microboost I should be heatsinking for best effect. I did read someone removed the protective silicon blob from the inductor and used that side but I haven't heard the contrary argument. I won't be able to heatsink both sides I don't think.

On the Flexdrive, it seems most of the delicate chips are on the same side so that's not such a problem, although I did notice the inductor getting pretty warm too. Will this happen with the Microboost and does it affect performance with a hot coil?

I'm hoping for some guidance as I'm not the electronics guy I'd like to be so please help a laser brother out.

Many thanks,

M


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Last edited by Morgan; 09-02-2010 at 09:51 PM.
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Old 09-08-2010, 07:33 PM #2
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Default Re: Heatsinking a Microboost

check out this thread Heatsinks for Driver?

I am thinking to use this thermal pad to stick the driver to the heatsink
AMD CPU Thermal Pad Phase Change Pad Laird 15x22x0.2mm - eBay (item 180541661186 end time Oct-01-10 16:32:15 PDT)
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Old 09-08-2010, 07:41 PM #3
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Default Re: Heatsinking a Microboost

My little TUT my help >> Mini Quick & dirty TUT. Pulsing Flex/Boost driver? Read in.
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Old 09-08-2010, 07:46 PM #4
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Default Re: Heatsinking a Microboost

Thanks for the link TheMonk. It didn't really answer my question though. I know how I'm going to heatsink, I just need know which side to put it on to have the greatest effect. The Flexdrive had both the, 'hot', chips on the same side AFAIK, but there are chips on both sides of the MicroBoost. I have a feeling the inductor may benefit too. It has a large surface area already and bonding that may draw heat away from other components as well. However, I do not know, hence the question.

M
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Old 09-08-2010, 08:00 PM #5
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Default Re: Heatsinking a Microboost

I would take a guess and say maybe the 6 pin chip next to the pot...

But this is a question for drlava...
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Old 09-08-2010, 08:40 PM #6
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Default Re: Heatsinking a Microboost

I was asking myself the same question morgan, though strictly, Jarob is right, i thought, if im unsure, i'll heatsink both sides...worked a treat.
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Old 09-08-2010, 08:56 PM #7
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Default Re: Heatsinking a Microboost

I did PM Dr.Lava but no reply.

I can't effectively sink both sides ped. I will only be looking for 900mA but it won't be alone.

Experimenting is always the fun bit though I suppose!

M
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Old 09-08-2010, 09:05 PM #8
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Default Re: Heatsinking a Microboost

That's about all you can do, then, Morgan. Just figure out which chip gets hotter. Careful, though, might get hotter than you expect. I overfed a green module I have, and it runs like crazy, but one resistor on the driver gets extremely hot. Talking, burned my fingerprints flat in a spot. Also keep in mind that this was the driver to a green laser, nothing as feature-packed and adjustable as the microboost.

Last edited by BShanahan14rulz; 09-08-2010 at 09:07 PM.
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Old 09-08-2010, 09:10 PM #9
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Default Re: Heatsinking a Microboost

I actually think its the little square pad by the inductor, that is a FET which is what all of the current goes through (as far as I know)

The little 6 pin chip is the switch, it turns the FET on and off really fast. I don't think any real current goes through the 6 pin one.

The coil is just copper wire around a ferrite core. I don't think heat will damage it...

I've tried asking the same question a bunch of times but never got a straight up answer.
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