Electronics > Projects, Designs, and Technical Stuff
Driving P-Channel Mosfet
Simon:
Yes that will be fine.
girishv:
--- Quote from: T3sl4co1l on June 27, 2020, 03:24:48 am ---Shrug, there's probably about as many logic-level as PMOS.
I suppose the widest option is regular NMOS + gate driver, a single (additional) component solution -- but a bit more expensive than a BJT or two.
Tim
--- End quote ---
I bought IRL6297SDPbF with VDSS 20V / VGS 12V± / RDS 5.3mΩ at 2.5V.
https://www.infineon.com/dgdl/irl6297sdpbf.pdf?fileId=5546d462533600a40153565ff22f2575
These are logic level. The current rating is way higher than requirement.
magic:
That's normal, the current rating is the maximum current it can conduct without burning, which doesn't mean anyone sane will want to actually operate it at the edge of burning.
It's just an impractical marketing number, like maximum power dissipation at 25°C case temperature :-DD
Simon:
Yes I do tire of MOSFET datasheets, whatever the Rdson is double it unless you need really high power in which case trawl through the datasheet until you find the real value at high temperature and hope it's a mere 1.6x the 25C value given on the headlines.
Current capacity is more like peak without rupturing the thing but does not take thermals into consideration which you need o calculate. Power dissipation as far as I am concerned is a magic number they pull out of their asses as it has no basis in reality, You need to carefully work out the total thermal impedance and the temperature rise whilst being realistic about your local ambient in the enclosure.
T3sl4co1l:
--- Quote from: Simon on July 14, 2020, 07:34:10 am ---Yes I do tire of MOSFET datasheets, whatever the Rdson is double it unless you need really high power in which case trawl through the datasheet until you find the real value at high temperature and hope it's a mere 1.6x the 25C value given on the headlines.
--- End quote ---
An FYI about that: low voltage MOSFETs (<= 20V or so) have flatter Rds(on) vs. temp. If given the choice between 20 and 30V devices, and the 20V has enough headroom to safely operate -- take it!
Tim
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version