TC652 MICROCHIP [Microchip Technology], TC652 Datasheet - Page 7

• Manufacturer Part Number: TC652
• Manufacturer: MICROCHIP [Microchip Technology]

TABLE 3-3:
Note: The Bold Type temperature settings are available for ordering.
T
be chosen at least 10°C higher than T
anywhere from 25°C to 35°C.
As an example, suppose you wanted the fan to run at
40% speed at 25°C or less and go to full speed at
45°C. You would order the part number TC652AEVUA.
As another example, suppose you wanted the fan to
turn on at 30°C and go to full speed at 45°C. You
would order the part number TC653BEVUA.
©
L
Range °C
2002 Microchip Technology Inc.
and T
Temp.
20°C
30°C
10°C
15°C
Contact factory for other temperature selections.
H
can be selected in 5°C increments. T
TEMPERATURE SELECTION
GUIDE
T
25
30
35
25
30
25
30
35
25
L
T
35
40
45
40
45
45
50
55
55
H
L
. T
L
can range
Part #
CG
AC
BD
CE
AD
BE
AE
AG
BF
H
must
4.0
4.1
For fans consuming more than 300mA, a slowdown
capacitor (C
switching PWM induced noise (see Figure 4-1). The
value of this capacitor should be 4.7µF to 47µF,
depending on the fan current consumption.
See Application Note AN771 “Suppressing Acoustic
Noise in PWM Fan Speed Control Systems” for more
information.
FIGURE 4-1:
+5V V
GND
DD
TYPICAL APPLICATIONS
Reducing Switching Noise
1
2
3
4
V
FAULT
SHDN
GND
SHDN Control
Fan Fault Alert
DD
SLOW
TC652
TC653
) is recommended for reducing
µController
TC652/TC653
T
OVER
PWM
GND
NC
REDUCING SWITCHING
NOISE
6
8
7
5
Over-Temp
Alert
1kΩ
10µF
C
0.01µF
SENSE
C
DS21453B-page 7
SLOW
+12V
GND
-
R
DC Fan
SENSE
400mA
2Ω
Max.