bd67929efv ROHM Co. Ltd., bd67929efv Datasheet - Page 8

• Manufacturer Part Number: bd67929efv
• Description: Three-phase Brushless Motor Driver For Polygonal Mirrors [for Lbp, Ppc]
• Manufacturer: ROHM Co. Ltd.

●Servo and PLL
●Input and output condition table
●Timing Chart
BD67929EFV
© 2010 ROHM Co., Ltd. All rights reserved.
www.rohm.com
This IC synchronizes the phase of the reference CLK signal and the internal three-phase synthesized FG in motor RPM
control. In the control system, the rising of the FG signal and the falling of CLK signal are monitored and the phase
comparison of the two signals is made. The output signal after the phase comparison is smoothed by the active filter with
the above INT amplifier used to determine the torque of the motor. The motor rotates at the torque determined here and the
FG signal is generated. The motor rotates at the number of revolutions according the CLK, and the IC goes into servo
mode.
Condition 1
Condition 2
Condition 3
Condition 4
Condition 5
Condition 6
HUN(35pin)= HVN(33pin)= HWN(31pin)= M
HUP
HVN
HWN
HUN
HVP
HWP
FG
W
U
V
Pin Name
Pin No.
HUP
15
H
H
H
L
L
L
Hall input
HVP
13
H
H
H
L
L
L
HWP
11
H
H
H
L
L
L
8/14
M
M
U
H
H
8
L
L
Output
M
M
H
H
7
V
L
L
W
M
M
H
H
6
L
L
FG logic
FG
H
H
H
3
L
L
L
Technical Note
2010.12 - Rev.A