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FAN8902 датащи(PDF) 10 Page - Fairchild Semiconductor

номер детали FAN8902
подробное описание детали  DC FAN Motor Controller
Download  14 Pages
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производитель  FAIRCHILD [Fairchild Semiconductor]
домашняя страница  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN8902 датащи(HTML) 10 Page - Fairchild Semiconductor

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FAN8902(KA3902)
10
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)
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].
Motor current
Normal operation
Stalled state
Reduced switch-on time
VCMD
VCS
VLa
Uncontrolled without the FAN8902
Controlled with the FAN8902
IMAX
current
[A]
ISRT
VSRT
VCMD [V]
VMAX
VBAT
FULL-ON
STOP
LINEAR
Motor


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