Rainbow Electronics MAX6641 - Manual (Page 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)
100 10 1
-1.25
-1.00
-0.75
-0.50
-0.25
0
-1.50
0.1 1000
T A = +80 °C, 250mV SQUARE WAVE APPLIED
AT V CC , NO BYPASS CAPACITOR
LOCAL TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
MAX6641 toc05
FREQUENCY (kHz)
TEMPERATURE ERROR (
°C)
100 10 1
-1.5
-1.0
-0.5
0
0.5
1.0
-2.0
0.1 1000
T
A
= +25 °C, 250mV SQUARE WAVE APPLIED
AT V CC , NO BYPASS CAPACITOR
REMOTE TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCY
MAX6641 toc06
FREQUENCY (kHz)
TEMPERATURE ERROR (
°C)
100 10 1
-1.0
-0.5
0
0.5
1.0
-1.5
0.1 1000
T A = +80 °C, V
IN = 100mV P-P
SQUARE WAVE APPLIED TO DXP
REMOTE TEMPERATURE ERROR
vs. DIFFERENTIAL-MODE NOISE FREQUENCY
MAX6641 toc07
FREQUENCY (kHz)
TEMPERATURE ERROR (
°C)
100 10 1
-0.5
0
0.5
1.0
1.5
-1.0
0.1 1000
T A = +80 °C, V
IN = 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)
10 1
-4
-3
-2
-1
0
1
2
3
-5
0.1 100
T A = +80 °C
PWM FREQUENCY ERROR
vs. DIE TEMPERATURE
MAX6641 toc09
TEMPERATURE ( °C)
PWM FREQUENCY ERROR (Hz)
100 75 50 25 0 -25
-2
-1
0
1
2
-3
-50 125
PWM FREQUENCY ERROR
vs. SUPPLY VOLTAGE
MAX6641 toc10
SUPPLY VOLTAGE (V)
PWM FREQUENCY ERROR (Hz)
5.0 4.5 4.0 3.5
-0.5
0
0.5
1.0
1.5
2.0
-1.0
3.0 5.5
T A = +25 °C
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, T
A
= +25 °C, unless otherwise noted.)