KA3011BD Fairchild Semiconductor, KA3011BD Datasheet - Page 10

• Manufacturer Part Number: KA3011BD
• Description: Motor / Motion / Ignition Controllers & Drivers
• Manufacturer: Fairchild Semiconductor
• Type: 3 Phase Brushless Spindle Motor Driverr

Specifications of KA3011BD

• Operating Supply Voltage: 5 V
• Mounting Style: SMD/SMT
• Package / Case: SSOPH-28
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5. ROTATIONAL DIRECTION DETECTION
• The forward and the reverse rotations of the CD are detected by the D-F/F and the truth table is shown above.
• The rotational direction of the CD can be explained by the output waveform of the hall sensors. The three outputs of hall
On the other hand, if the spindle rotates in forward rotation, the phase relationship is H3 H2 H1 as shown in Fig.(b).
The output of the rotational direction detector is low, when the spindle rotates forward, and high in the reverse rotation.
sensors be H1, H2 and H3 respectively.
When the spindle rotates in reverse direction, the hall sensor output waveforms are shown in Fig.(a). The
in H1 H2 H3 with a 120 C phase difference.
H2+
H3+
H2
H3
H1
H2
H3
H1
H2
H3
+
+
D
CK
D-F/F
Q
V
CC
10
DIR
20
Rotation
Reverse
Forward
( a) Reverse rotation
( b) Forward rotation
20
High
Low
DIR
phases order are
KA3011BD