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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
haxor5354 wrote ...
so im suppose to use a mosfet that doesn't have an internal diode that goes from source to drain? or else it will heat up?
No you just use a method that stops the internal Diode from conducting (at least for now to see if this is the cuase of your unexplained heat), in short keep that zener reversede biased, and under its breakover voltage. !!!
Let me see... the datasheet says... Vsd = 1.3 V, if thats at 4 or 10 amps that could be the reason for so much heat.
Crap! im sobering up!
haxor5354 wrote ...
ok I followed this schematic
UPDATE: Given the above pic... i think you need a diode between the mosfet and inductor, with the polarity arranged so that the inductor back EMF cant get to the mosfet (reversed biased horizontal diode) but then the Back EMF gets conducted through the vertical diode (forward biased) and to the load, i think this will solve your heat problems.
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help needed for a buck converter
