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From: legg <legg@nospam.magma.ca>
Newsgroups: sci.electronics.design
Subject: Re: neat Hall sensor
Date: Fri, 03 Jan 2025 09:33:01 -0500
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On Thu, 02 Jan 2025 08:09:16 -0800, john larkin <JL@gct.com> wrote:

>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:
>>
>>>
>>>https://www.monolithicpower.com/en/mcs1802.html?srsltid=AfmBOoq2BNuYQ-Ef5ee9o7-gyHDqRkK_xS5TAKb-MgxtjZ6r71FItxXm
>>>
>>>Really nice, as compared to a shunt and an isolated ADC and all that
>>>stuff. Reasonably accurate, especially above 20c.
>>>
>>>But they can't be serious about pushing 50 amps through an SO8
>>>package. Or not for long.
>>>
>>>Their demo board thermal design is kinda silly.
>>>
>>>
>>
>>Demo board makes sense to me. Simplest thermal conductivity 
>>test.
>
>They used 4 oz copper, hardly practical.

?

What's impractical about 4oz copper in a power circuit?
Are you saying it's not enough?

I'd say it was more than could be expected from a 
simple demo board and is typical of higher current 
layout in this neck of the woods, where power and 
control circuits try not to share the same board or 
board layer. 

Also, using a part with a 50A full scale in a 25-30A 
continuous rated circuit would be normal pactice, 
where duty cycle, crest factor or pulse/surge are 
anticipated under normal operating conditions. 

There are 'better' SMD packages available, if that is your 
only concern. You seem to have found some.

RL