LB1895D Sanyo, LB1895D Datasheet - Page 11

• Manufacturer Part Number: LB1895D
• Description: 3-Phase Brushless Motor Driver for CD-ROM Spindle Motors
• Manufacturer: Sanyo

LB1895,1895D — Example of using a comparator to detect the direction of rotation
When VC ^ VC
When the phasing is as shown above, the direction of rotation is determined to be
‘‘forward’’ if W
‘‘reverse’’ if W
1)
2)
If braking is applied according to the value obtained by OR logic in V
is applied according to the following timing.
As a result, when the rotation speed is fast, braking is applied many times; at slower speeds, braking is applied fewer times.
Furthermore, if the V
When VC % VC
Reverse full braking method
Braking is applied with VC = L until reverse rotation is detected. The moment that reverse rotation is detected, the driving
power is turned off or a short pulse is input.
Intermittent braking method
W COMPO
W COMPO
W COMPO
V COMPO
V COMPO
V COMPO
COMPO
VC = 2.5V
VC = 0V
COMPO
REF
REF
COMPO
is high at the rising edge of V
is low at the rising edge of V
and W
COMPO
logic combination is changed, the duty of VC = 0 V – 2.5 V also changes.
COMPO
COMPO
LB1895, 1895D
, and
.
fig. 2
fig. 1
COMPO
and W
COMPO
together, for example, reverse braking
A06730
A06729
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