Presale: The Ben Boost

rhd said:

Jander - I'm not at all familiar with the flex (never use them). Would they require heatsinking at 1.2A ?

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About 1050mA and under you can expect a decent duty cycle without them over heating. This is throughout the battery 4.2V=3.6V as the do produce more heat when the batteries voltage drops either due to the process of boosting or the extra current running through the driver.

Mohrenberg said:

Maybe take some IR thermometer readings to see how close the settings get to thermal shutdown would be awesome.

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I plan on getting some time tomorrow night to do some testing. I have just not been able to find the time to start playing with them.:yabbem:

Batch of 300 boards shipped today.

Nice!

I can't wait to Get my First Patch of Drivers.

My other 1000 are done as well and will be shipped to me on Monday.

Though I'm kind of broke from my cnc focus adapters, c6 sinks, and laser engraved c6 hosts so it might be a bit before I get the drivers ready.

Maybe a bit off toppic but is it possible to parallel say a microboost and a benboost and still have a useable pot from the microboost? Eg Maxed out microboost outputs 500-1050ma combine with a 800ma benboost and get 1300-1800ma? Just a thaught on making it possible to pot a project without having to do anything special. And the microboost just doesnt have enough current output for the new builds.

Kizdawg said:

Maybe a bit off toppic but is it possible to parallel say a microboost and a benboost and still have a useable pot from the microboost? Eg Maxed out microboost outputs 500-1050ma combine with a 800ma benboost and get 1300-1800ma? Just a thaught on making it possible to pot a project without having to do anything special. And the microboost just doesnt have enough current output for the new builds.

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I don't see why it wouldn't work

Im not sure that would work. The microboost probably has a very low value resistor (0.1 maybe 0.05). Between neg input and neg out for current sensing, while the ben boost has the current set resistor between the two negatives. So if you parallel them you will also put the microboosts low value sense resistor and the ben boosts set resistor in parallel causing the ben boost to try and output more current. It will probably fry the diode which will then fry both the drivers.

Yeah I wasnt sure if it would work because of the different designs but then I thaught of the statement just add up the resistance and it got me thinking that maybe it would.

When you parallel a microboost it is not like doing it with dual flexdrives. One microboost runs full blast and the other only picks up the slack. Not sure what effect that would have trying to do it with a driver of different design.

DTR said:

When you parallel a microboost it is not like doing it with dual flexdrives. One microboost runs full blast and the other only picks up the slack. Not sure what effect that would have trying to do it with a driver of different design.

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It's a very specific fluke in the design of the Ben Boost that allows two driver of different set currents to be paralleled. The reason it works, is that (essentially) the two different set currents get summed, and then divided in half, and each driver then (more or less) handle's one-half of the summer current. So you don't actually have each driver supplying different amounts of current.

I *would not* count on the Microboost behaving this way alongside a Ben Boost, and from DTR's comments, it doesn't even sound like the Micro behaves this way when paralleled with one of its own.

More to the point, I can't imagine why you would WANT to do this. Is it just that you want pot control?!?

That, I don't understand. If you're paralleling two, then it's surely for a 445. 445s are generally all going to take the same current (almost all will survive 1.5A, and most will be ok up to 1.8A). So how much pot-control is needed?

I've been almost exclusively using 864mA versions, paralleled for around 1700mA. It works great. I wouldn't want to add the complexity of two different driver type to a build, just for the benefit of being able to play around with current via a pot, within 100mA +/-.

Fair enough! It was more just a thaught to use the old drivers in a good way but I understand now that it wouldnt work...

Hello, any chance of having a 1.5A one? i dont want to run two together as i wont have enough room in my c6

I'm sure there is one in that range but it's going to run hot and would need a heatsinking to the host. Oh maybe he changed that... looks like he is only going to 1256 now most likely due to the heat.

hmm damn, if he can make a 1.5A version for me, im sure i wont have a problem heat sinking it though.

Lets all drop what we are doing to get xivlia his driver and diode... just might free up some server space.... :tired:

xivlia said:

Hello, any chance of having a 1.5A one? i dont want to run two together as i wont have enough room in my c6

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xivlia said:

hmm damn, if he can make a 1.5A version for me, im sure i wont have a problem heat sinking it though.

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Ignore the fact that Moh isn't setting these any higher than 1256mA. I'm sure there's no reason for that. He just picked a random current and said "ok, lets stop here".

Read more.

The current abilities of this driver have been discussed to great depth.