KA3014 Fairchild Semiconductor, KA3014 Datasheet - Page 17

• Manufacturer Part Number: KA3014
• Description: MOSFET & Power Driver ICs QFPH-48
• Manufacturer: Fairchild Semiconductor

Specifications of KA3014

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

KA3014
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,
• When the MD is rotating in forward direction, E
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.
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.
As the controlling time of E
the MD from rotating in the reverse direction, a reverse rotation preventing function is required.
Its operational principles are discussed below.
E
H2+
H2
H3+
H3
E
CR
C
Rotation
Reverse
Forward
+
+
+
H1
H2
H3
C
>E
H2
H
L
D
CK
CR
D-F/F
+
+
+
gets longer, MD slows down, stops, and then rotates in the reverse direction. To prevent
Q
H
H
H3
C
>E
L
L
CR
is sometimes controlled to retard and/or stop the MD.
17
D-F/F
H
L
Controller
Current
Sense
Amp
Gain
E
Forward
Reverse rotation preventer
C
FG OUTPUT
<E
–
CR
Driver
Brake and stop
E
C
stop
>E
CR
M