Re: Mosfet Drivers and Input Hysteresis

D from BC wrote:

On Sun, 03 Jun 2007 08:23:03 -0700, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:


D from BC wrote:


On Sat, 02 Jun 2007 20:01:30 GMT, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:



D from BC wrote:



Isn't this a kickass mosfet driver?
http://ixdev.ixys.com/Data***/99061.pdf
IXYS ISDD414PI

Anyways...as on the data***..
Vih=3.5min Vil = 0.8Vmax..
That just tells me the max hysteresis...
The min hysteresis is unknown and the typical input hysteresis is
unknown.
Heck..I'm not even sure if chip has input hysteresis.. :P
(I sent an email to IXYS Corp but it's the weekend...)

I've noticed some Microchip drivers have 300mV input hysteresis..
The max5048 has a whopping 1.6V of input hysteresis but no stock at
Digikey..

I want to put a slooooowwwww signal + some noise to a mosfet driver.
Anybody know a mosfet driver that has something between 0.5V to 1V of
input hysteresis?

I suspect this is going to be a pita item to search for because input
hysteresis is too "mickey mouse" to include on manufacturers selection
tables..
This means looking at every freakn data***...?
Or should I just email a bunch of companies for the info?
D from BC


It's customary to provide your own hysteresis ;-)

Seriously, a couple of resistors do the trick. Or drive the driver with with Schmitt.


Yeah...but I'm trying to reduce the component count.. I make my own
PCB's so if my circuits are low in components then I don't have to do
much PCB drafting and fab..
D from BC


But then you'll be stuck with expensive boutique parts that hardly anybody else uses.


Ahh.. but if the boutique parts speed up my project time..great!
As long as the boutique parts stay at a insignificant cost level..
Ex..I change $900.00 for a one off project.. One $4.00 boutique part
is insignificant..


Ok then. As long as they don't have to build another one in three years and then your part has gone unobtanium.

--
Regards, Joerg

http://www.analogconsultants.com
.

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