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dannym
dannym
Associate III
March 11, 2014
Question

Detemining the driving capability of an STM32 output

  • March 11, 2014
  • 1 reply
  • 826 views
Posted on March 11, 2014 at 21:48

I'd like to model if it's practical to drive an STM32 output into a transistor.  

I've got some Optimos 3 transistors with a 2.8v Vth:

http://www.mouser.com/ds/2/196/BSC340N08NS3G_rev2.6-76670.pdf

The transistor would be driving at about 5amps.  It might be necessary to drive it in the 500 KHz, maybe 1 MHz range.  It doesn't necessarily have to be that transistor.

This is more load than you'd normally connect, if the current drive to the gate is too low the transistor will switch slowly and generate a lot of switching heat while in the linear region.  

But you don't just ''assume'' something won't work, especially when much cheaper/simpler than building a driver.  Are there detailed specs on STM32 pins I can model in PSPICE to see what sort of transistor switching heat I'll end up with?
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    1 reply

    waclawek.jan
    waclawek.jan
    Super User
    March 12, 2014
    Posted on March 12, 2014 at 10:58

    IBIS models for some of the STM32F families are available under the ''Design Resources'' on the product's page or through the ''models/hardware'' menu in the family page, e.g. http://www.st.com/stonline/stappl/resourceSelector/app?page=fullResourceSelector&doctype=hw_model&SeriesID=1031

    JW

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