FAN8902 查看數據表（PDF） - Fairchild Semiconductor

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产品描述 (功能)

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FAN8902

DC FAN Motor Controller

Fairchild Semiconductor 

FAN8902(KA3902)

Motor current

VCMD

VLa

VCS

Reduced switch-on time

Uncontrolled without the FAN8902

Controlled with the FAN8902

Normal operation

Stalled state

8. Operational Mode Selection

The FAN8902 has three operation modes as follows:

- STOP: Turned-off the power MOSFET

- LINEAR: Linearly controlled the power MOSFET

- FULL-ON: Fully turned-on the power MOSFET

The voltage, VSRT (PIN #9) and VMAX (PIN #7), in the application circuit are as follows:

- VSRT (PIN #9) = Vref × R7 / (R5 + R6 + R7)

- VMAX (PIN #7) = Vref × (R6 + R7) / (R5 + R6 + R7)

IMAX

Motor

current

[A]

ISRT

STOP

VSRT

LINEAR

FULL-ON

VMAX

VBAT

VCMD [V]

9. Over Voltage Protector (Ovp)

If the voltage, VBAT ≥ 36[V], the output (pin #12) is grounded, and the switching device (power MOSFET) is turned-off, and

the motor is stopped. Then if the voltage, VBAT → 36[V], the switching device is turned-on again, and the motor is operated.

10. Totem-pole Output

The FAN8902 has a single totem-pole output driver which can be drive current to peak ±0.8[A].

10

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