lb1895 Sanyo Semiconductor Corporation, lb1895 Datasheet - Page 8

• Manufacturer Part Number: lb1895
• Description: 3-phase Brushless Motor Driver Cd-rom Spindle Motors
• Manufacturer: Sanyo Semiconductor Corporation

Continued from preceding page.
Pin No.
19 (20)
20 (21)
22 (25)
23 (26)
24 (27)
25 (29)
27 (30)
7 (6)
1
2
S/S
SIG
GND
FC
VC
VC
W
PWR
GND
V
U
RF
Symbol
OUT
OUT
OUT
REF
0 V to V
2 V to 3 V
0 V toV
Voltage
CC
CC
1
1
(27)
24
(20)
200
19
LB1895, 1895D
(25)
22
100µA
Equivalent circuit
50k
75k
20k
(29)
(30)
25 1
27
7 (6)
V CC1
2k
5k
V CC1
V CC2
2
100µA
200
A06721
A06722
A06724
V CC1
A06723
(26)
23
None of the circuits operate if the
voltage on this pin is 0.7 V or less,
or if this pin is open.
When driving the motor, the
voltage on this pin must be 2 V or
more.
Ground connection for all circuits
except the outputs.
Control loop frequency
characteristics compensation pin.
Connect a capacitor between this
pin and GND to stop closed loop
oscillation in the current control
system.
Control reference voltage
application pin. This voltage
determines the control start
voltage.
Speed control voltage application
pin. V-type control, where:
VC > VC
VC < VC
W-phase output pin.
Output transistor ground.
V-phase output pin.
U-phase output pin.
Upper output NPN transistor
collector pin (three-phase
common). Connect a resistor
between V
current detection. When this
voltage is detected, the constant
current control and current limiter
circuits function.
REF
REF
CC
Description
3 and the RF pin for
= forward and
= reverse
No.5634-8/12