Power Metal Oxide Semiconductor Field Effect Transistor (Power Mos Fet) Function; Construction/Operation - Mazda 2006 MX-5 Service Highlights

POWER METAL OXIDE SEMICONDUCTOR FIELD EFFECT TRANSISTOR (POWER MOS FET) FUNCTION

Function
• Controls the supply voltage to the blower motor
according to the gate voltage sent from the
climate control unit and adjusts the rotation speed
(airflow volume).

Construction/Operation

• There are four electrodes: source, gate, drain and feedback electrodes.
• The resistance between terminals C and D
(between drain and source) changes according to
the voltage (gate voltage) applied to terminal A
(gate).
• When the gate voltage increases, the resistance
between terminals C and D decreases, allowing
the current to flow easily.
End Of Sie
07–40–4
CONTROL SYSTEM
CLIMATE
CONTROL
UNIT
FEEDBACK
GATE
B
A
LOW GATE VOLTAGE HIGH GATE VOLTAGE
POWER MOS FET
M
FEED
BACK
BLOWER MOTOR
GATE
VOLTAGE
DRAIN
C
B
A
D
SOURCE
SMALL CURRENT
C
B
A
D
E5U074000116N01
BLOWER
RELAY
B+
IG2
E5U740ZS5007
C A
D B
E5U740ZS5008
LARGE CURRENT
C
D
E5U740ZS5009