Rainbow-electronics MAX6645 Manual do Utilizador descarregar pdf (Página 3)

MAX6643/MAX6644/MAX6645

Automatic PWM Fan-Speed Controllers with

Overtemperature Output

_______________________________________________________________________________________ 3

OPERATING SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX6643 toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

5.04.54.03.5

240

280

320

360

400

200

3.0 5.5

PWMOUT FREQUENCY

vs. DIE TEMPERATURE

MAX6643 toc02

TEMPERATURE (°C)

PWMOUT FREQUENCY (Hz)

10085603510-15

31.2

31.4

31.6

31.8

32.0

31.0

-40

TRIP-THRESHOLD ERROR

vs. TRIP TEMPERATURE

MAX6643 toc04

TRIP TEMPERATURE (°C)

TRIP-THRESHOLD ERROR (°C)

806040

-0.6

-0.2

0.2

0.6

1.0

-1.0

20 100

MAX664_L VERSIONS

PWMOUT FREQUENCY

vs. SUPPLY VOLTAGE

MAX6643 toc03

SUPPLY VOLTAGE (V)

PWMOUT FREQUENCY (Hz)

5.04.54.03.5

3.0 5.5

Typical Operating Characteristics

= +25°C, unless otherwise noted.)

ELECTRICAL CHARACTERISTICS (continued)

= +3.0V to +5.5V, T

= -40°C to +125°C, unless otherwise noted. Typical values are at V

= +3.3V, T

= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DIGITAL INPUTS (FULLSPD, FULLSPD, TACHSET)

= 5.5V

3.65

Logic-Input High V

= 3.0V 2.2

Logic-Input Low V

= 3.0V 0.8 V

Input Leakage Current V

= GND or V

-1 +1 µA

Note 1: All parameters tested at T

= +25°C. Specifications over temperature are guaranteed by design.

1 2 3 4 5 6 7 8 ... 16 17

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