Mazda CX-9 2007 Service Highlights page 321

FRONT POWER METAL OXIDE SEMICONDUCTOR FIELD EFFECT TRANSISTOR (POWER MOS FET)
CONSTRUCTION
Function
• Controls the supply voltage to the front blower
motor according to the gate voltage sent from the
front 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 A and E
(between drain and source) changes according to
the voltage (gate voltage) applied to terminal F
(gate).
• When the gate voltage increases, the resistance
between terminals A and E decreases, allowing
the current to flow easily.
End Of Sie
NG: REAR POWER MOS FET
CONTROL SYSTEM
FRONT
CLIMATE
CONTROL
UNIT
FEEDBACK
GATE
B
F
SMALL CURRENT
FRONT POWER MOS FET
BLOWER
RELAY
M
FEEDBACK
FRONT
BLOWER
MOTOR
GATE FRONT POWER MOS FET
VOLTAGE
DRAIN
A
B
F
E
SOURCE
LOW GATE VOLTAGE HIGH GATE VOLTAGE
A
B
F
E
LARGE CURRENT
id074000104800
B+ IG2
07-40
am8rrn00000318
A
E
F D B
am8rrn00000319
A
E
am8rrn00000320
07-40–9