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參數(shù)資料
| 型號： | KA3014 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 光電元器件 |
| 英文描述： | Spindle + 4-CH Motor Driver |
| 中文描述： | CD MOTOR DRIVER, PQFP48 |
| 封裝： | 14 X 14 MM, HEAT SINK, QFP-48 |
| 文件頁數(shù)： | 17/26頁 |
| 文件大?。?/td> | 419K |
| 代理商： | KA3014 |
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KA3014
17
8. REVERSE ROTATION PREVENTING FUNCTION
The forward and reverse rotation of the motor are detected, as shown in the table below. Consequently at reverse rotation,
the D-F/F output Q becomes low and cuts off the output current sense amp, resulting in the stoppage of the gain controller
function.
When the MD is rotating in forward direction, E
C
>E
CR
is sometimes controlled to retard and/or stop the MD.
As the controlling time of E
C
>E
CR
gets longer, MD slows down, stops, and then rotates in the reverse direction. To prevent
the MD from rotating in the reverse direction, a reverse rotation preventing function is required.
Its operational principles are discussed below.
9. FG OUTPUT FUNCTION
The FG output detects the number of rotations of the MD. This is generated from zero-crossing of the hall sensor output wave-
forms. The FG output circuit is as shown below.
Rotation
H2
H3
D-F/F
Reverse rotation preventer
E
C
<E
CR
Forward
–
E
C
>E
CR
Brake and stop
stop
Forward
Reverse
H
L
H
→
L
H
→
L
H
L
+
+
+
Current
Sense
Amp
Gain
Controller
Driver
D-F/F
M
D
Q
CK
H3+
H3
H2+
H2
E
C
E
CR
+
+
+
H1
H2
H3
FG OUTPUT
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