FAN8902 データシートの表示（PDF） - Fairchild Semiconductor

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FAN8902

DC FAN Motor Controller

Fairchild Semiconductor 

Application Information

1. Under Voltage Lockout (UVLO)

13

FAN8902

Vref &

output driver

TH(ST) 8.0V

THYS 1.2V

2. Current Sensing Circuit

FAN8902(KA3902)

ICC

6mA

1mA

6.8V

8V VTH(ST)

Imax=1V

PWM comparator

+

PWM

12

−

Logic

×5

10

Current amplifier

FAN8902

M

R5

IM

VS

RS

VBAT

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

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

RS

=

1----V------⁄--5--

20A

=

10 [ m Ω ]

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.

6

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