Alternative BluePill sized F4

If you made your own board, post here, unless you built a Maple or Maple mini clone etc
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Squonk42
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Location: Bordeaux, France

Re: Alternative BluePill sized F4

Post by Squonk42 » Sun Oct 15, 2017 7:41 pm

You may use the now obsolete IRU1206-33CY, also 1A, $11.15 / 50 PCE:
https://www.aliexpress.com/item/sku/32485042169.html

What about the strange traces I mentioned in my earlier post?

racemaniac
Posts: 554
Joined: Sat Nov 07, 2015 9:09 am

Re: Alternative BluePill sized F4

Post by racemaniac » Mon Oct 16, 2017 7:59 am

The top & bottom plane are VCC & GND, so it's where i switch between layers to allow the fill to pass by those traces
and this is not the final layout. it was a first go at seeing of something like that would work :). and also to get some feedback of what you guys think :).

Ollie
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Re: Alternative BluePill sized F4

Post by Ollie » Mon Oct 16, 2017 4:55 pm

I like this idea. There are several cases where I would like to have something between blue pill (103C8) and blue pad (407VE). When and how I can buy one. Initially, the price is not critical for me.

racemaniac
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Re: Alternative BluePill sized F4

Post by racemaniac » Mon Oct 16, 2017 6:03 pm

Ollie wrote:
Mon Oct 16, 2017 4:55 pm
I like this idea. There are several cases where I would like to have something between blue pill (103C8) and blue pad (407VE). When and how I can buy one. Initially, the price is not critical for me.
Same here, as i'm learning how to design boards, it's fun to see what would be possible in the range of boards i'd actually like. i love the bluepill/maple mini size, and i'm wondering if we can't pack more power into that size. But i'm still pretty new at this, so maybe after building & using those boards, i'll discover why they're not being made ^^'.
i'm also wondering what other's capabilities are on this forum, if it just ends with a nice design for this, will people have them produced at one of the boardhouses & assemble a few themselves? (it's easier than i used to think :).)
it's a fun road to go down, making your own boards, and seeing the f4 bluepill thread, i'm wondering where this will lead :).

and i also like the feedback on the design (like the voltage regulator)
aliexpress can be *very* frustrating in finding good parts >_<...

victor_pv
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Re: Alternative BluePill sized F4

Post by victor_pv » Tue Oct 17, 2017 4:52 pm

Racemaniac, this article from Linear can provide some information on using several LDOs to share the load:
http://www.linear.com/solutions/5759

About voltage regulators, I just noticed this one in Mouser, listed as new:
LDL1117S33R

Only 250uA quiescent current, and 350mV dropout

Still the AP2114 Squonk pointed too seems like the best for a drop in 1117 replacement.

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Pito
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Re: Alternative BluePill sized F4

Post by Pito » Fri Oct 20, 2017 8:00 pm

The problem with the original design is not the power dissipated itself, but the package type which has got a large thermal resistance so it will smoke at Iout >200mA. A sot-223 or sot-89 or dpack is a better choice, but still the power must be dissipated somewhere.

If you chase a small size and large currents and less heat then the only solution is a switcher.. The switcher is more complex and adds noise which is not easy to filter.
Pukao Hats Cleaning Services Ltd.

Ollie
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Re: Alternative BluePill sized F4

Post by Ollie » Sat Nov 04, 2017 3:16 am

There was a reference to 100 pin STMH743 as the next step after F4. Here are some reference points of prices:
1. STM32H743ZI Nucleo board
- I got mine today and paid $23 at Mouser
- After the purchase, I have seen the prices as low as $19
2. STM32H743ZI chip (144 pin)
- Directly from ST for $8.90 (in lots of 10,000)

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