Rainbow-electronics MAX6645 Manual do Utilizador descarregar pdf (Página 15)

MAX6643/MAX6644/MAX6645

Automatic PWM Fan-Speed Controllers with

Overtemperature Output

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MAX6643

MAX6644

MAX6645

DXP1/(DXP)

DXP2

TEMPERATURE

SENSOR

TEMPERATURE

LOGIC

PWM

GENERATOR

FAN-FAIL

DETECTION

DUTY CYCLE

ANALOG SENSE

TACHOMETER

LOCKED ROTOR IN

ANALOG SENSE

TACHOMETER

LOCKED ROTOR IN

OT TH TL

THRESHOLD

SELECTION

FULLSPD/(FULLSPD)

PWM_OUT

FAN_IN1

FAN_IN2

FANFAILTACHSET

OT1 OT2 TH1 TH2 TL1 TL2

() ARE FOR MAX6643 ONLY.

Block Diagram

TO FANFAIL

ALARM

MAX6643_A_

TH1

(TACHOMETER MODE)

TO OVERTEMPERATURE ALARM

TL2

TL1

FANFAIL

TACHSET

FULLSPD

GND

DXP

(+3.0V TO +5.5V)

FAN

(5V OR 12V)

TH2

OT1

OT2

PWM_OUT

FAN_IN1

FAN_IN2

4.7kΩ

Typical Operating Circuit

1 2 ... 10 11 12 13 14 15 16 17

MAX6643/MAX6644/MAX6645 1
Overtemperature Output 1

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