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TC652AEVUA Datasheet(PDF) 7 Page - Microchip Technology

Part # TC652AEVUA
Description  Integrated Temperature Sensor & Brushless DC Fan Controller
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC652AEVUA Datasheet(HTML) 7 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21453B-page 7
TC652/TC653
TABLE 3-3:
TEMPERATURE SELECTION
GUIDE
Note: The Bold Type temperature settings are available for ordering.
Contact factory for other temperature selections.
TL and TH canbe selectedin5°C increments. TH must
be chosen at least 10°C higher than TL.TL can range
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.
4.0
TYPICAL APPLICATIONS
4.1
Reducing Switching Noise
For fans consuming more than 300mA, a slowdown
capacitor (CSLOW) is recommended for reducing
switching PWM induced noise (see Figure 4-1). The
value of this capacitor should be 4.7
µFto47µF,
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:
REDUCING SWITCHING
NOISE
Temp.
Range °C
TL
TH
Part #
10°C
25
35
AC
30
40
BD
35
45
CE
15°C
25
40
AD
30
45
BE
20°C
25
45
AE
30
50
BF
35
55
CG
30°C
25
55
AG
1
8
2
7
3
6
4
5
VDD
PWM
GND
TOVER
NC
GND
GND
+5V VDD
CSENSE
CSLOW
0.01µF
10µF
RSENSE
2
1k
+12V
TC652
TC653
SHDN
FAULT
GND
µController
DC Fan
400mA
Max.
SHDN Control
Fan Fault Alert
Over-Temp
Alert
-


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