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Power FET question - RF Cafe Forums
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krc
Post subject: Power FET question Posted: Fri Apr 21, 2006 10:42
pm
Lieutenant
Joined: Fri Apr 21, 2006 10:34 pm
Posts:
3
hi...i am student and this is simple question: i have a power
fet that need to be biased at 12 A of current for its Id biasing.however
the current source outputs 25 A of current. since i don't have resistor
that can handle this level of current what can i do so that only 12
A of current goes in the drain of the current? thanx
kc
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IR
Post subject: Posted: Mon Apr 24, 2006 4:07
pm
Site Admin
Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello,
The current passing
through the FET's drain is set by the minimal load that you will connect
to your circuit. There are many current limiting circuits relatively
easy to implement, and you need to use one in your design. Look in Google
there are many applications for such circuits.
Here is just
a single example from a quick search in Google:
http://www.radio-electronics.com/info/c
... imiter.php
Good luck!
_________________
Best
regards,
- IR
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Jeanalmira
Post subject:
Posted: Tue Jun 13, 2006 10:21 pm
General
Joined:
Tue Mar 15, 2005 11:43 pm
Posts: 65
Location: Singapore
Hi
krc :
I agree with IR.
Antoher way to control the drain current,
you also may want to limit/set your gate biasing voltage, so that it
will give you the desired drain current at respective drain voltage.
For doing this, you can try to apply voltage divider in the gate bias
line.
I hope it helps.
Cheers,
Jean
Posted 11/12/2012
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