Re: neat Hall sensor

On Thu, 02 Jan 2025 09:05:03 -0500, legg <legg@nospam.magma.ca> wrote:

On Tue, 31 Dec 2024 15:58:07 -0800, john larkin <jl@glen--canyon.com>
wrote:
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https://www.monolithicpower.com/en/mcs1802.html?srsltid=AfmBOoq2BNuYQ-Ef5ee9o7-gyHDqRkK_xS5TAKb-MgxtjZ6r71FItxXm
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Really nice, as compared to a shunt and an isolated ADC and all that
stuff. Reasonably accurate, especially above 20c.
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But they can't be serious about pushing 50 amps through an SO8
package. Or not for long.
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Their demo board thermal design is kinda silly.
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Demo board makes sense to me. Simplest thermal conductivity
test.

They used 4 oz copper, hardly practical.

They mostly wasted the bottom  layer thermally.

The pour geometry crowds the heat into two corners so adds thermal
resistance.

The vias are too small and poorly located.

It's OK for maybe the 10 or 20 amp versions, but 50 will get nasty.

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Looks like ACS7xx from Allegro.

This is nice:

https://www.digikey.com/en/products/detail/allegro-microsystems/ACS37010LLZATR-050B5/18734205?gclsrc=aw.ds&utm_adgroup=&gad_source=1&gclsrc=aw.ds

Good accuracy, chunky leads. But seems to only come in 30 and 50 amps.

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Rl