KNOW THE MOSFET
2SK3599-01MR and IRFB4212 are Enhancement-type N-channel MOSFET
• Enhancement-type MOSFET is also known as
normally off (when VGS=O, Drain current=o) MOSFET.
• N-channel MOSFET: The more positive the gate
voltage (VGS), the greater the drain current.
• There is a built in zener diode in these two kinds
of MOSFET, but it does not show in manual’s
diagram.
• The RDS (resistance between Drain and Source)
will increase when VGS drop to below 8v; and it
causes the MOSFET to get very hot and damage.
• MOSFETs have a thin layer of silicon dioxide;
this insulating layer is kept as thin as possible to
give the gate more control over drain current.
Because the insulating layer is so thin, it is easily
destroyed by excessive gate-source voltage.
-
+
+
• The transient voltages by inductive kickback and other effects may exceed the V
GS
(max)
rating; even handling a MOSFET may deposit enough static charge to exceed the
V
GS (max)
rating.
POWER SUPPLY 3/5
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