Rainbow-electronics MAX6641 Manual do Utilizador descarregar pdf (Página 4)

MAX6641

SMBus-Compatible Temperature Monitor with

Automatic PWM Fan-Speed Controller

4 _______________________________________________________________________________________

REMOTE TEMPERATURE ERROR

vs. POWER-SUPPLY NOISE FREQUENCY

MAX6641 toc04

FREQUENCY (kHz)

TEMPERATURE ERROR (°C)

100101

-1.25

-1.00

-0.75

-0.50

-0.25

-1.50

0.1 1000

= +80°C, 250mV SQUARE WAVE APPLIED

AT V

, NO BYPASS CAPACITOR

LOCAL TEMPERATURE ERROR

vs. POWER-SUPPLY NOISE FREQUENCY

MAX6641 toc05

FREQUENCY (kHz)

TEMPERATURE ERROR (°C)

100101

-1.5

-1.0

-0.5

0.5

1.0

-2.0

0.1 1000

= +25°C, 250mV SQUARE WAVE APPLIED

AT V

, NO BYPASS CAPACITOR

REMOTE TEMPERATURE ERROR

vs. COMMON-MODE NOISE FREQUENCY

MAX6641 toc06

FREQUENCY (kHz)

TEMPERATURE ERROR (°C)

100101

-1.0

-0.5

0.5

1.0

-1.5

0.1 1000

= +80°C, V

= 100mV

P-P

SQUARE WAVE APPLIED TO DXP

REMOTE TEMPERATURE ERROR

vs. DIFFERENTIAL-MODE NOISE FREQUENCY

MAX6641 toc07

FREQUENCY (kHz)

TEMPERATURE ERROR (°C)

100101

-0.5

0.5

1.0

1.5

-1.0

0.1 1000

= +80°C, V

= 10mV

P-P

SQUARE WAVE APPLIED

TO DXP - DXN

REMOTE TEMPERATURE ERROR

vs. DXP - DXN CAPACITANCE

MAX6641 toc08

DXP - DXN CAPACITANCE (nF)

NORMALIZED TEMPERATURE ERROR (°C)

101

-4

-3

-2

-1

-5

0.1 100

= +80°C

PWM FREQUENCY ERROR

vs. DIE TEMPERATURE

MAX6641 toc09

TEMPERATURE (°C)

PWM FREQUENCY ERROR (Hz)

1007550250-25

-2

-1

-3

-50 125

PWM FREQUENCY ERROR

vs. SUPPLY VOLTAGE

MAX6641 toc10

SUPPLY VOLTAGE (V)

PWM FREQUENCY ERROR (Hz)

5.04.54.03.5

-0.5

0.5

1.0

1.5

2.0

-1.0

3.0 5.5

= +25°C

Typical Operating Characteristics (continued)

= 3.3V, T

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 ... 16 17

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