Rainbow-electronics MAX6645 Manual do Utilizador descarregar pdf (Página 9)

MAX6643/MAX6644/MAX6645

Automatic PWM Fan-Speed Controllers with

Overtemperature Output

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MAX6644

TH1

TL2

TL1

FANFAIL

TACHSET

DXP2

GND

DXP1

TH2

OT1

OT2

PWM_OUT

FAN_IN1

FAN_IN2

4.7kΩ

FAN

(5V OR 12V)

(+3.0V TO +5.5V)

FAN

(5V OR 12V)

2.0Ω

4.7kΩ

TO FANFAIL

ALARM

0.1µF

CURRENT-SENSE

MODE

CURRENT-SENSE

MODE

TO OVERTEMPERATURE

ALARM

MAX6645

FANFAIL

TACHSET

DXP2

GND

DXP1

PWM_OUT

FAN_IN1

FAN_IN2

4.7kΩ

FAN

(5V OR 12V)

(+3.0V TO +5.5V)

FAN

(5V OR 12V)

4.7kΩ

TO FANFAIL

ALARM

TACHOMETER MODE

TO OVERTEMPERATURE

ALARM

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.

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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