FAN8902 datasheet(6/14 Pages) FAIRCHILD

Il numero della parte	FAN8902

Spiegazioni elettronici	DC FAN Motor Controller

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Produttore elettronici	FAIRCHILD [Fairchild Semiconductor]

Homepage	http://www.fairchildsemi.com

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6 / 14 page

FAN8902(KA3902)

6

Application Information

1. Under Voltage Lockout (UVLO)

2. Current Sensing Circuit

The peak current, IM(MAX)=VS/RS

For example, if a required maximum current, IM(MAX)=20[A]

3. Thermal Shutdown (Tsd)

When the chip, temperature rises up to 150

°C, the thermal shutdown (TSD) circuit is activated and the output driver turn off,

and then turn on again at 125

°C.

TH(ST)

THYS

8.0V

1.2V

13

Vref &

output driver

FAN8902

ICC

6mA

1mA

6.8V

8V

VTH(ST)

PWM

Logic

× 5

Imax=1V

+

−

Current amplifier

FAN8902

PWM comparator

12

10

M

R5

VBAT

IM

RS

VS

R

S

1V 5

⁄

20A

---------------

10 m

Ω

[]

==

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