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Old 04-15-2012, 06:04 AM   #51
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Hey, so not to derail this discussion, but I have good news! I got 30 boards in the mail and will be doing assembly tomorrow afternoon. They should be shipped out to Clif on Monday
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Old 04-15-2012, 06:27 AM   #52
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Round ones? Welcome creator!!!

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Old 04-15-2012, 06:42 AM   #53
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

To clarify, when I said that "Jib" had a creative way to regulate case-positive builds with a continuous-negative driver, I meant "Jib" as in the person (not "Jib" as in "a Jib driver")

Here:
Has anyone had experience making a (negative) regulating version of the DDL ?
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Old 04-15-2012, 07:49 AM   #54
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Quote:
Originally Posted by rhd View Post
To clarify, when I said that "Jib" had a creative way to regulate case-positive builds with a continuous-negative driver, I meant "Jib" as in the person (not "Jib" as in "a Jib driver")

Here:
Has anyone had experience making a (negative) regulating version of the DDL ?
The case positive diode that is asking about is the problem...

That diagram of his won't work with a driver that is regulating through the positive side of the driver. (for a case positive diode like he is asking about) Not unless the diode is isolated from the supply like a 445, 405, or 635... (unless I'm not reading his diagram correctly)

Because with a linear driver (Jib, DDL, FlexModP3), the negative input and output are one and the same. So it's a direct connect from the negative supply to the diode.

Now if you also give a direct connect from the positive supply to the diode as that diagram shows, then it's the same as not even having a driver in there. It will by-pass the driver...
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Last edited by jayrob; 04-15-2012 at 07:55 AM.
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Old 04-15-2012, 05:10 PM   #55
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

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Originally Posted by jayrob View Post
The case positive diode that is asking about is the problem...

That diagram of his won't work with a driver that is regulating through the positive side of the driver. (for a case positive diode like he is asking about) Not unless the diode is isolated from the supply like a 445, 405, or 635... (unless I'm not reading his diagram correctly)

Because with a linear driver (Jib, DDL, FlexModP3), the negative input and output are one and the same. So it's a direct connect from the negative supply to the diode.

Now if you also give a direct connect from the positive supply to the diode as that diagram shows, then it's the same as not even having a driver in there. It will by-pass the driver...
Take another look at that diagram (note the pin names).

That's why his setup was particularly ingenious, it WILL work for case positive diodes, even with regulators that regulate through the positive side of the driver.

It's brilliant really, and simple. You can use a typical linear (DDL, Jib, Mohgasm,etc) to drive case positive build without isolation.
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Old 04-15-2012, 06:25 PM   #56
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Hmmm...

Interesting.

So you are saying that you can just reverse the polarity in the connection with a linear driver?

Just do everything the same, except switch positive with negative?

This is new to me. Have you tried it?

Edit: Oh I see now... The circuit is connected the same. But after the diode instead of before the diode! Ingenious!



This thought it new to me, and I'm still trying to wrap my head around it. One question. How about the negative input of a linear driver such as a FlexModP3 or a Jib driver? Do you have a diagram?
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Last edited by jayrob; 04-15-2012 at 06:48 PM.
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Old 04-20-2012, 07:13 AM   #57
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Yeah I dont get it... Isnt that just like puting in the battery backwards! I did see that on one of the DRLAVA diagrams.
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Old 04-20-2012, 10:47 AM   #58
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Quote:
Originally Posted by Kizdawg View Post
Yeah I dont get it... Isnt that just like puting in the battery backwards! I did see that on one of the DRLAVA diagrams.
Nope!

In a series circuit the current is the same throughout it....so as a result it will still be the same amount of current no matter if you place the laser diode before or after the linear regulator.

With switching ones, however, this is not the case...
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Old 04-20-2012, 05:23 PM   #59
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Just a little update, guys. The first set of boards was received by Clif yesterday. I expect them up for sale on his site either today or tomorrow.

Once they are up for sale, I think I may open up a legitimate advertising thread for 'em.
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Old 04-20-2012, 05:30 PM   #60
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Quote:
Originally Posted by Wolfman29 View Post
Just a little update, guys. The first set of boards was received by Clif yesterday. I expect them up for sale on his site either today or tomorrow.

Once they are up for sale, I think I may open up a legitimate advertising thread for 'em.
I'd certainly like to try one of these boards, they must be of great quality

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Old 04-20-2012, 08:43 PM   #61
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

The first iteration s actually not that nearly high-quality as the next batches will be. The board manufacturer screwed up the boards (or at least there was a misunderstanding on what it means to have a lower limit on trace width :P ), so a trace that was required for correct operation is missing. I jumpered the traces necessary so it is perfectly functional and the jumper did not increase the overall size of the board or ability to heatsink, but it doesn't look as pretty :P

These are going to be selling on Clif's site at a discounted price of $20 each board because it is only the V1 version. V2, requiring less heatsinking, will probably be listed on his site in the middle of next week.
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Old 04-22-2012, 10:21 PM   #62
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

If I'm going to heat sink this driver, which side would I thermal epoxy onto it? I'd know if it were a boost or linear, but I've never worked with a buck driver before. The round component side or the square one? Thanks in advance! Sweet new driver on the block.
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Old 04-22-2012, 11:05 PM   #63
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Heatsink the side with the big square chip. Also, if you can, the resistor on the other side. The resistor shouldn't need heatsinking, but it will heat up, so if you can heatsink it, it will help total board dissipation.
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Old 04-23-2012, 10:29 PM   #64
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Good news on the BlitzBuck front!

BlitzBuck V1 Round, a more efficient design, has just been successfully tested! It is capable of outputting over 2A (haven't tested higher) continuously without a duty-cycle at over 90% efficiency! With the proto-design (situated on a 16.4mm singled sided board), I am drawing 1.35A at 8.7V to output 5.2V at 2.04A! And, this is just the beginning! The next version should be capable of outputting 3A of power for those of you wanting to test the other diodes

These will probably not be in Clif's shop until the middle of May, but they will be very capable.

Look forward to a V2 of the rectangular version (still approximately 75-80% efficient) in Clif's shop as well, soon!

Also... this one is continuous ground! WOOO!

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Old 05-01-2012, 06:59 PM   #65
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Will this 1.17 amp BlitzBuck V2 [BB1.17V2] - $17.99 : Cajunlasers Store drive this?

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Old 05-01-2012, 07:44 PM   #66
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Unfortunately, as far as I know, the BlitzBuck can't drive that low of a voltage. It may be able to though. I will need to do more extensive testing. This driver, however, was originally built for 445s.
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Old 05-04-2012, 04:07 PM   #67
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Wolf; why wouldn't it be able to?

It's a buck driver, so it can drop the voltage as much as it needs to. Hell, if it really wanted to it could output 0 volts. That's the great thing about buck drivers.
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Old 05-04-2012, 06:24 PM   #68
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

That's what I wondered too. But it wouldn't draw any current or output anything when I tried it. But it may have been a defective board.

Ah... I know why. The board can't drop below 2.5V out... for now

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Old 05-04-2012, 08:57 PM   #69
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

I like that "for now "

You smart kids are fun to watch!

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Laser Safety and Eye Injury

Last edited by tsteele93; 05-04-2012 at 08:58 PM.
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Old 05-04-2012, 09:02 PM   #70
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Yeah, that version probably won't be released until mid-August at the earliest. I haven't even started design on it. I am still waiting on the 100 BlitzBuck V3s that clif ordered for his shop before I go off to FermiLab.
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Old 05-04-2012, 09:10 PM   #71
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Quote:
Originally Posted by Wolfman29 View Post
Yeah, that version probably won't be released until mid-August at the earliest. I haven't even started design on it. I am still waiting on the 100 BlitzBuck V3s that clif ordered for his shop before I go off to FermiLab.
Aww come on man, I was thinking early next week!

Hey, thanks again for all your help understanding the drivers better.
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Old 05-04-2012, 10:16 PM   #72
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

No problem
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Old 05-06-2012, 12:44 AM   #73
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

Let me know when you have some for sale...
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Old 05-06-2012, 05:59 AM   #74
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver

The V2 is for sale right now at CajunLasers.com.
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Old 06-20-2012, 07:41 PM   #75
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Default Re: Teaser: The BlitzBuck - A 2A+ Switching Buck Driver



Afraid that would happen...

Click Here for a picture of the driver and how to wire it and set current

.
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Tom Steele

Why I'm Here

405nm tsteele93 12x build @ 545mW

445nm Survival Laser @ 1.25W - GIFTED
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

Laser Safety and Eye Injury

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