TC652DEVUA Ver la hoja de datos (PDF) - Microchip Technology

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Fabricante

TC652DEVUA

Integrated Temperature Sensor & Brushless DC Fan Controller with FanSense™ Detect & Over-Temperature

Microchip Technology 

TABLE 3-3: TEMPERATURE SELECTION

GUIDE

Temp.

Range °C

TL

10°C

25

30

35

15°C

25

30

20°C

25

30

35

30°C

25

TH

Part #

35

AC

40

BD

45

CE

40

AD

45

BE

45

AE

50

BF

55

CG

55

AG

Note: The Bold Type temperature settings are available for ordering.

Contact factory for other temperature selections.

TL and TH can be selected in 5°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.

TC652/TC653

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 4.7µF 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:

REDUCING SWITCHING

NOISE

+12V

+5V VDD

TC652

TC653

1 VDD

2 FAULT

PWM 8

GND 7

1kΩ

10µF

-

CSLOW

DC Fan

400mA

Max.

3 SHDN

4 GND

TOVER 6

NC 5

0.01µF

CSENSE

GND

SHDN Control

Fan Fault Alert

Over-Temp

Alert

RSENSE

2Ω

µController

GND

© 2002 Microchip Technology Inc.

DS21453B-page 7

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