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Boost driver ideas...

J

jaap75

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Ok, I odered the 0805 size.

But witch voltage should the 10uf and 0,1uf capicators be?
 





pocketfluff

pocketfluff

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Shoot for about 25v for the electrolytics. I measured the volts at one of the caps at about 12v once. Ceramics are commonly 50v, which is fine.
 
J

jaap75

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All right,
I contacted my supplier and he sad that 10 uF smd ceramic capacitors did not exist. That the value was to high. And that he only had Tantalum and Electrolytic. Witch one is the best?

And about the scaling of the image of woop's circuit.
I tried to scale it down to 12%. I tried on two printers one normal printer and one laser printer. And they both where only able to go down to 25%.

So how did you scale your images down to 12%

Please let me know,
Thanks, Yoeri
 
W

woop

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Nov 9, 2007
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jaap75 said:
All right,
I contacted my supplier and he sad that 10 uF smd ceramic capacitors did not exist. That the value was to high. And that  he only had Tantalum and Electrolytic. Witch one is the best?

And about the scaling of the image of woop's circuit.
I tried to scale it down to 12%. I tried on two printers one normal printer and one laser printer. And they both where only able to go down to 25%.

So how did you scale your images down to 12%

Please let me know,
Thanks, Yoeri
Click to expand...
:-? i am pretty sure they make them, cos i have some, and they measure around 10uF...

with the image scaling, when you press print, just type in 13% in the scale box under page setup
if you are using windows, open the image in paint, go to page setup and change the scaling to 13%, press ok and go to print.
 

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J

jaap75

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O.k I got the right scale. With my printer it was equally 15%.

About the capacitors, I guess he just doesn't have them.
But will Tantalum or Electrolytic work? 10uF is 10uF right?
 
rkcstr

rkcstr

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jaap75 said:
All right,
I contacted my supplier and he sad that 10 uF smd ceramic capacitors did not exist. That the value was to high. And that  he only had Tantalum and Electrolytic. Witch one is the best?
Click to expand...

Not sure what your supplier's saying... I have a few different 10uf ceramic caps rated 6.3V and 10V, 0805 sized, but you can get larger capacitance/voltage/size as well.  Maybe they don't make them in whatever size or voltage you asked?  :-?

jaap75 said:
O.k I got the right scale. With my printer it was equally 15%.

About the capacitors, I guess he just doesn't have them.
But will Tantalum or Electrolytic work? 10uF is 10uF right?
Click to expand...

That makes more sense. But, that depends on what the circuit needs... ceramics have very low ESR, which may be necessary in your circuit, in which case an electrolytic may not be good, but low ESR tantalums may work. It all depends on the circuit, which you shoudl read through the datasheet for suggestions.
 
W

woop

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rkcstr said:
That makes more sense.  But, that depends on what the circuit needs... ceramics have very low ESR, which may be necessary in your circuit, in which case an electrolytic may not be good, but low ESR tantalums may work.  It all depends on the circuit, which you shoudl read through the datasheet for suggestions.
Click to expand...
the datasheet does specifically call for low ESR ceramics.
but tantalum's should work too, i used them on another similar driver with no problems
 
W

woop

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well i designed a board with high side current sensing using the lt6106. its 9 x 13.5mm
there is a bottom ground layer as well. thats where the green vias go
I haven't calculated resistances to set the current yet
my samples from linear came today so i can make it and test it out.
 

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rkcstr

rkcstr

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Awesome... looks good.

toked323 said:
Very Nice woop, Does it still fit in an AixiZ module?
Click to expand...

It should, my drivers are ~9.25x17.5mm and they fit... I think the inner dimensions of the module are ~10mmx20mm.
 
T

toked323

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Thanks rckstr.

Hey woop, Does linear really send one of their representatives to deliver a product?
 
rkcstr

rkcstr

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toked323 said:
Thanks rckstr.

Hey woop, Does linear really send one of their representatives to deliver a product?
Click to expand...

Haha, I doubt it. I ordered a couple of samples for their opamp for the DIY power meter, they didn't even tell me I was approved or that they were sending them, just had an envelope in the mail a week or two later.
 
T

toked323

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Rubberband, we are using the same, and somewhat in a way better (adj version) regulator boost chip.
same concept but easier to make.
 
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