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PDF LB1895 Datasheet ( Hoja de datos )

Número de pieza LB1895
Descripción 3-Phase Brushless Motor Driver for CD-ROM Spindle Motors
Fabricantes Sanyo 
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LB1895 datasheet

1 Page

LB1895 pdf
LB1895 Pin Assignment
LB1895, 1895D
28 27 26 25 24 23 22
21 20 19 18 17 16 15
LB1895
HSOP-28
1234567
8 9 10 11 12 13 14
A06714
Top view
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
LB1895D
DIP-30SD
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
A06715
Top view
No.5634-5/12

5 Page

LB1895 arduino
LB1895, 1895D
LB1895,1895D — Example of using a comparator to detect the direction of rotation
When VC ^ VCREF
VCOMPO
WCOMPO
When VC % VCREF
VCOMPO
WCOMPO
A06729
When the phasing is as shown above, the direction of rotation is determined to be
‘‘forward’’ if WCOMPO is low at the rising edge of VCOMPO, and
‘‘reverse’’ if WCOMPO is high at the rising edge of VCOMPO.
1) 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.
2) Intermittent braking method
VCOMPO
WCOMPO
VC = 2.5V
VC = 0V
fig. 1
fig. 2
A06730
If braking is applied according to the value obtained by OR logic in VCOMPO and WCOMPO together, for example, reverse braking
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 VCOMPO and WCOMPO logic combination is changed, the duty of VC = 0 V – 2.5 V also changes.
No.5634-11/12

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