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參數(shù)資料
| 型號(hào)： | KA3902 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | DC FAN Motor Controller |
| 中文描述： | BRUSH DC MOTOR CONTROLLER, 0.8 A, PDIP14 |
| 封裝： | 0.300 INCH, DIP-14 |
| 文件頁(yè)數(shù)： | 10/14頁(yè) |
| 文件大?。?/td> | 127K |
| 代理商： | KA3902 |
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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, V
SRT (PIN #9)
and V
MAX (PIN #7)
, in the application circuit are as follows:
- V
SRT (PIN #9)
= Vref
×
R7 / (R5 + R6 + R7)
- V
MAX (PIN #7)
= Vref
×
(R6 + R7) / (R5 + R6 + R7)
9. Over Voltage Protector (Ovp)
If the voltage, V
BAT
≥
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, V
BAT
→
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
V
CMD
V
CS
V
La
Uncontrolled without the FAN8902
Controlled with the FAN8902
I
MAX
Motor
[A]
I
SRT
V
V
CMD
[V]
V
MAX
V
BAT
FULL-ON
STOP
LINEAR
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