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Re: gEDA-user: MOSFET high-side driver schematic symbol suggestion?

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Bill Gatliff wrote:
> Christoph Lechner wrote:
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>> Bill Gatliff wrote:
>>   
>>> Guys:
>>>
>>>
>>> Anyone care to suggest a schematic symbol for a MOSFET high-side 
>>> driver?  I'm having artist's block.  :)
>>>     
>> What about a box, with some pins? ;)
>> This is the way IRF does it.
>> http://www.irf.com/product-info/datasheets/data/ir2184.pdf
>>   
> 
> That's what my current symbol looks like.  :)
> 
> I'm considering dividing it up into two sub-symbols, however.  One for 
> the driver itself, and the other showing the "power" leads (for 
> decoupling caps, etc.).
I won't do that as it adds some extra confusion when you have to look
which parts belong together. Usually a half bridge driver has 14 pins
max. so no need to split it in bank like a FPGA.

> 
> I might make the driver symbol look like a typical sideways triangle 
> a'la an op-amp, but there are three pins: the input, the output, and the 
> source voltage feedback.  So re-using that metaphor seems like a bad 
> idea--- but I might do it anyway. :)  Otherwise, it'll be just a boring 
> old box with three pins.
Or two driver symbols in a big box like Joerg suggested ...

The problem with a half-bridge driver is that you don't have two
identical drivers in a package. For the high-side driver a possible
symbol would look like
     |\/--- boost cap
     | \
in --|  *-- out
     | /
     |/
(I hate ASCII schematics) but the low side driver is different, of course.

That's a big pro for the "box plus pins" solution.

- - cl
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