KA3017 Fairchild Semiconductor, KA3017 Datasheet - Page 17

• Manufacturer Part Number: KA3017
• Description: MOSFET & Power Driver ICs QFPH-48
• Manufacturer: Fairchild Semiconductor

Specifications of KA3017

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

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
E
H2+
H2
H3+
H3
Rotation
E
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.
controlling time of E
MD from rotating in the reverse direction, a reverse rotation resistant function is required. Its operational principles are
discussed below.
Reverse
Forward
CR
C
+
+
+
H1
H2
H3
C
>E
H2
H
L
CR
CK
D
gets longer, MD slows down, stops, and then rotates in the reverse direction. To prevent the
D-F/F
Q
H
H
H3
L
L
C
>E
CR
D-F/F
is sometimes controlled to retard and/or stop the MD. As the
H
L
Controller
Current
Sense
Amp
Gain
E
Forward
Reverse Rotation Preventer
C
<E
–
CR
( b)
Driver
Brake and Stop
E
C
Stop
>E
CR
M
KA3017
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