MAX6645 데이터 시트보기 (PDF) - Maxim Integrated
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MAX6645 Datasheet PDF : 17 Pages
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Automatic PWM Fan-Speed Controllers with
Overtemperature Output
VDD (+3.0V TO +5.5V)
+VFAN (5V OR 12V)
+VFAN (5V OR 12V)
4.7kΩ
TO FANFAIL
ALARM
1 TH1
2 TL2
VDD 16
TH2 15
3 TL1 MAX6644
4
FANFAIL
14
OT1
13
OT2
5
TACHSET
12
PWM_OUT
6
DXP2
7
GND
11
FAN_IN1
10
FAN_IN2
8 DXP1
9
OT
4.7kΩ 4.7kΩ
CURRENT-SENSE 0.1μF
MODE
CURRENT-SENSE
MODE
0.1μF
TO OVERTEMPERATURE
ALARM
N
N
2.0Ω
2.0Ω
Figure 3. MAX6644 Using Two External Transistors to Measure Remote Temperatures and Control Two 2-Wire Fans. The fan’s power-
supply current is monitored to detect failure of either fan. Connect pin 10 to pin 11 if only one fan is used.
VDD (+3.0V TO +5.5V)
+VFAN (5V OR 12V)
+VFAN (5V OR 12V)
4.7kΩ
TO FANFAIL
ALARM
1 FANFAIL
10
VDD
4.7kΩ
4.7kΩ
2
9
TACHSET
PWM_OUT
N
3
DXP2
4
GND
MAX6645 FAN_IN1 8
7
FAN_IN2
TACHOMETER MODE
TACHOMETER MODE
5 DXP1
6
OT
TO OVERTEMPERATURE
ALARM
Figure 4. MAX6645 Using Two External Transistors to Measure Remote Temperatures and Control Two 2-Wire Cooling Fans. The
fan’s power-supply current is monitored to detect failure of either fan. Connect FAN_IN1 to FAN_IN2 if only one fan is used.
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