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參數資料
| 型號： | FAN8902 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | DC FAN Motor Controller(風扇直流電機控制器) |
| 中文描述： | BRUSH DC MOTOR CONTROLLER, 0.8 A, PDIP14 |
| 封裝： | 0.300 INCH, DIP-14 |
| 文件頁數： | 9/14頁 |
| 文件大小： | 140K |
| 代理商： | FAN8902 |
FAN8902(KA3902)
9
The buffer OP-amp selects the lower command between V
CMD
and V
La
so as to limit the stalled motor current to very low in
the above figure. Because of much larger V
La
than V
CMD
, the motor operating point stays at A. But the point gradually moves
toward B’ and then B” through the curve from the instance of stall as the below figure.
VLa curve
×
(1 / R)
The voltage drop
on the amarture resistance
V
LA
V
CMD
I
RAT
V
MOTOR,STALL
V
BAT
V
LA
V
LA
V
MOTOR
Operating curve
A
B
B
’
B
”
Motor current
Normal operation
Stalled state
Reduced switch-on time
V
CMD
V
CS
V
La
Uncontrolled without the FAN8902
Controlled with the FAN8902
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