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Old 06-05-2012, 02:42 AM #97
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by tsteele93 View Post
And the hard parts, it has to fit on the very small landing pad and be available. Coilcraft makes a very good, reasonably priced, low DCR 1.5uH inductor that would be great - except they don't let anyone else sell it and they aren't in stock right now.
Many thanks again Tom for your efforts.
You are in the right and constructive spirit



Last edited by laserluke; 06-05-2012 at 02:48 AM.
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Old 06-05-2012, 01:11 PM #98
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Originally Posted by laserluke View Post
Many thanks again Tom for your efforts.
You are in the right and constructive spirit
Thanks Luke, if you think that inductor is a good one then I will try to put together and order and get some parts to send out to everyone ASAP.

-Tom
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Old 06-05-2012, 08:10 PM #99
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by tsteele93 View Post
Thanks Luke, if you think that inductor is a good one then I will try to put together and order and get some parts to send out to everyone ASAP.

-Tom
Yes, at this moment it seems the better you have found.
When you, anthot and foulmist have decided where to build the first board, it could also be useful to have there the coilcraft original inductors from anthot, so you can plan extensive testings and a comparation of the performances with your inductor and the coilcraft model.
Anthot says he has a reflow oven which i think it could be a very useful tool to rapidly mount the components of one or more boards.
...and about me... i have access to a laboratory to help the testing if you agree... and also foulmist can do some testing...
...and... don't forget we must decide a name for this new baby... official opening of the proposals... at this moment i'm running out of imagination

Last edited by laserluke; 06-05-2012 at 08:13 PM.
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Old 06-05-2012, 08:33 PM #100
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Originally Posted by laserluke View Post
Yes, at this moment it seems the better you have found.
When you, anthot and foulmist have decided where to build the first board, it could also be useful to have there the coilcraft original inductors from anthot, so you can plan extensive testings and a comparation of the performances with your inductor and the coilcraft model.
Anthot says he has a reflow oven which i think it could be a very useful tool to rapidly mount the components of one or more boards.
...and about me... i have access to a laboratory to help the testing if you agree... and also foulmist can do some testing...
...and... don't forget we must decide a name for this new baby... official opening of the proposals... at this moment i'm running out of imagination
yup i got a reflow it works like a charm, im hoping to order the PCB's with the rest of the parts on the weekend
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Old 06-05-2012, 11:15 PM #101
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Hey Anthot, be very very careful on that reflow. I've used various DFN chips in my drivers and they are quite hard to solder correctly. You absolutely have to use reflow or hot air, it is nearly impossible to solder a DFN with a regular iron.

I really like how this is open source! Tps63020 drivers get pretty expensive though. If you mess it up like $15 in parts are gone, then your next one cost $30.

If you haven't reflowed DFN before don't expect your first one to work. I wish you guys the best of luck in the reflow, it is very frustrating when they don't work!
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Old 06-05-2012, 11:37 PM #102
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

I have a hot air solder station, so I may try that. I also bought a high-tech reflow oven from Goodwill for $3.50 - a nice small 1,000 watt toaster oven and I have an IR thermometer so I could try that route as well.

P.S. Thanks for the well-wishes! We will probably need them!
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Old 06-05-2012, 11:39 PM #103
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Originally Posted by benmwv View Post
Hey Anthot, be very very careful on that reflow. I've used various DFN chips in my drivers and they are quite hard to solder correctly. You absolutely have to use reflow or hot air, it is nearly impossible to solder a DFN with a regular iron.

I really like how this is open source! Tps63020 drivers get pretty expensive though. If you mess it up like $15 in parts are gone, then your next one cost $30.

If you haven't reflowed DFN before don't expect your first one to work. I wish you guys the best of luck in the reflow, it is very frustrating when they don't work!
my first DFN reflow was just completely bridged every single pin was connected except the GND pad underneath the chip lol... anyway about 15 DFN chips later i thing i got the hang of it

I love SOIC8 packaged ic's they're so easy to solder i wish there were more packaged like that
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Old 06-05-2012, 11:47 PM #104
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Luke (or anyone)

How do you use the TINA-SPICE simulation?

I have TINA-SPICE and even have drawn up a schematic on another board I am working on - but I'm not sure what to do with it once I've drawn it up.

I also put an ammeter on my schematic where you have the stack of diodes. I guess the diodes make sense considering that is how we test the loads in real life... I wonder if Nichia has spice files for the laser diodes?
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Old 06-06-2012, 12:15 AM #105
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by AnthoT View Post
my first DFN reflow was just completely bridged every single pin was connected except the GND pad underneath the chip lol... anyway about 15 DFN chips later i thing i got the hang of it

I love SOIC8 packaged ic's they're so easy to solder i wish there were more packaged like that
Haha, I had a similar experience with my first try. Well I didn't bridge every pin but I bridged a lot of them. I can get them to work basically every time now, but it takes a long time to get the paste on there just right. These no-pin ICs just aren't very hobbyist friendly.

Tom, maybe you can find some really cheap DFN ICs to get some practice in on without wasting any tps63020's. Make some random breakout boards or something like that.
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Old 06-06-2012, 12:17 AM #106
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Maybe I can just solder some leads on the IC!
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Old 06-06-2012, 12:19 AM #107
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Maybe I can just solder some leads on the IC!
lol it would bridge if you use an iron & some wire
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Old 06-06-2012, 12:20 AM #108
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Yeah, I was kidding!
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Old 06-06-2012, 12:23 AM #109
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Yeah, I was kidding!
oh its hard to tell sarcasm on the internet
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Old 06-06-2012, 01:07 AM #110
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

It is easy, if I say it then it is probably sarcastic.
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Old 06-06-2012, 01:52 AM #111
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

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Originally Posted by tsteele93 View Post
Luke (or anyone)

How do you use the TINA-SPICE simulation?

I have TINA-SPICE and even have drawn up a schematic on another board I am working on - but I'm not sure what to do with it once I've drawn it up.

I also put an ammeter on my schematic where you have the stack of diodes. I guess the diodes make sense considering that is how we test the loads in real life... I wonder if Nichia has spice files for the laser diodes?
Very important is the transient analysis. Use the menu "analysis"-"transient" and set the time interval. You can observe the time evolution of currents and voltages at the circuit nodes you are interested.

Hey, no proposal yet for the name of this driver?
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Old 06-06-2012, 01:56 AM #112
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Default Re: 17mm buck-boost driver (TPS63020 and LT6106)

Quote:
Originally Posted by laserluke View Post
Very important is the transient analysis. Use the menu "analysis"-"transient" and set the time interval. You can observe the time evolution of currents and voltages at the circuit nodes you are interested.

Hey, no proposal yet for the name of this driver?
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445nm Stainless Steel Monster with H140 diode @1.62A - 2.15W!
450nm rhd single mode @ 190mW

532nm O-like 50 mW pen from Cajun Lasers - small dot, tight beam!
532nm O-like Crown, rated @ 400mW, metered @ ~450mW with AW battery!
532nm O-like Crown rated @ 500mW, not yet tested
532nm RPL-165 @ 204mW
532nm RPL-375 @ 427mW

635nm rhd Lipstick Tube @ ~485+ mW
638nm Fat Boy @ 825mW - custom build

650nm Bolly BL-8006 @ 319mW

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