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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 
Logotipo Sanyo Logotipo

Total 12 Páginas
		
LB1895 Hoja de datos, Descripción, Manual
Ordering number: EN5634
Monolithic Digital IC
LB1895, 1895D
3-Phase Brushless Motor Driver for
CD-ROM Spindle Motors
Overview
The LB1895 and LB1895D are 3-phase brushless motor drivers
for use in CD-ROM spindle motors.
Package Dimensions
unit : mm
3222-HSOP28
Functions and Features
. Current linear drive
. V-type control amplifier built in
. Because the power supply for the bias circuit on the upper
output side is separate, output with low saturation can be
attained by boosting only that power supply. (Effective when
. VCC = 5 V)
Because current is detected on the upper side, there is no
voltage loss due to the RF resistance. In addition, the RF
voltage reduces the power dissipation within the IC.
(Effective when VCC = 5 V)
. Start/Stop function built in
. Thermal shutdown circuit built in
. Overcurrent protection circuit built in
. Two-channel Hall signal comparator built in.
. (For detecting rotation direction and Hall FG output)
Hall device bias built in
28
1
0.8
unit : mm
3196-DIP30SD
[LB1895]
15
14
2.7 0.3
15.2
0.2
0.8
SANYO : HSOP28
[LB1895D]
SANYO : DIP30SD
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
4097HA(II) No.5634-1/12

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

11 Page


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