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May 16, 2021, 02:47 PM
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Cool

AM32 ESCs can now be just as small as EFM8 based ones!


So I tried to use the STM32F051 in WLCSP-36 to build an ESC for use with AM32. It took some new (to me) assembly techniques and throwing out some things that were in the way:
  • No UART telemetry with the current routing solution
  • had to disable AlkaM's debugging LED
  • while I was at it, tried 0201 passives and low-temp solder paste
Since I couldn't order a PCB with micro vias or via-in-pad, I had to go down a path that is not unknown, but I took it to an extreme. Up to 4 pads of the package are routed together to get the signal out:
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For FETs I used SIZF360 (dual NFET), which have the switch node as an extra pad on the top side - so no extra motor wire pads:
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I found these rather hilarious so I named the whole thing hilariESC. If you want to build one: https://github.com/crteensy/ESC-single-F051T8Yx

And here's a video of it spinning:
hilariESC with AM32 experimental (0 min 22 sec)

(That's a half-built Yolo to the left of it)

I've created a pull request for AM32's experimental branch, and we might design an AIO with these chips, similar to the Yolo (see here, we still need to get professionally assembled prototypes funded: https://www.rcgroups.com/forums/show...-Prototype-Fly).

Depending on the PCB technology, an AM32 ESC can now be just as small as an EFM8 based one, or even slightly smaller and without that EFM8's huge ground pad getting in the way.

This was fun!
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May 18, 2021, 06:34 AM
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Quote:
Originally Posted by crteensy
I found these rather hilarious so I named the whole thing hilariESC.
You're right, those things are hilarious, I can imagine the technical design meetings in Vishay's engineering department "You want want? are you serious?" "Yes, it'll be hilarious!". They were right. It is.

How on earth did you even come across those parts?
May 18, 2021, 11:16 AM
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I was looking for smaller dual FETs in the 5A range for a 16 mm PSoC AIO and the HypaWhoop. So I checked Vishay's lineup, ran across these, and just ordered a dozen.
May 20, 2021, 04:17 PM
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Failed successfully at 12 A:
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I expected it to handle at least 16 A continuous current, and I think something was still wrong about the layout or the quality of my assembly in general.
May 21, 2021, 12:05 AM
Registered User
HQ4025
Xing1404 3800KV 13.6A
BetaFPV1505 3600KV 15A

GF5125
Apex1607 2825KV 17A

15A should be OK for all my ultralight needs.
But.. I burned 2x 15A and 20A AIO FC with Xing1404.

Let me know if you can find/ design for at least 16A. I have hot air and USB microscope.. but only cleanly solder 0603.
May 21, 2021, 02:38 AM
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Quote:
Originally Posted by romangpro
HQ4025
Xing1404 3800KV 13.6A
BetaFPV1505 3600KV 15A

GF5125
Apex1607 2825KV 17A

15A should be OK for all my ultralight needs.
But.. I burned 2x 15A and 20A AIO FC with Xing1404.

Let me know if you can find/ design for at least 16A. I have hot air and USB microscope.. but only cleanly solder 0603.
What voltage were those motors running on?
We've had a Mamba 1408 4000KV on 3S pulling 16 A for minute through SIZ200s. They are similar in size to the SIZF360, but don't have a top pad to solder on. The SIZ200s are used in some commercial ESCs, ad we're putting them on the Yolo as well (see here: https://www.rcgroups.com/forums/show...-Prototype-Fly)


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