Re: neat Hall sensor

On Fri, 03 Jan 2025 10:36:36 -0500, legg <legg@nospam.magma.ca> wrote:

On Thu, 02 Jan 2025 08:09:16 -0800, john larkin <JL@gct.com> wrote:
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On Thu, 02 Jan 2025 09:05:03 -0500, legg <legg@nospam.magma.ca> wrote:
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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.

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They used 4 oz copper, hardly practical.
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They mostly wasted the bottom  layer thermally.
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The pour geometry crowds the heat into two corners so adds thermal
resistance.
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The vias are too small and poorly located.
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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.

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This is nice:
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https://www.digikey.com/en/products/detail/allegro-microsystems/ACS37010LLZATR-050B5/18734205?gclsrc=aw.ds&utm_adgroup=&gad_source=1&gclsrc=aw.ds
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Good accuracy, chunky leads. But seems to only come in 30 and 50 amps.
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ACS711 has had commodity pricing for the last decade.
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RL

It's pin compatible with the Microcircuits part if you ignore pin 6.