lb1997 Sanyo Semiconductor Corporation, lb1997 Datasheet - Page 7

• Manufacturer Part Number: lb1997
• Description: Three-phase Brushless Motor Driver For Cd-rom Spindle Drive
• Manufacturer: Sanyo Semiconductor Corporation

Pin Descriptions
Pin number
23
22
25
24
17
18
21
27
26
28
1
2
4
7
9
Pin name
SIG GND
V
V
V
W
W
V
V
U
U
CC
CC
CC
R S
F G
V
S/S
F C
IN
IN
IN
IN
IN
IN
H
1
2
1
2
2
3
1
1
2
0V to V
Pin voltage
V
4V to 13.6V
4V to 13.6V
1.2V to
4V to 6V
CC
1–1V
CC
1
10
12
8
75 A
200
30 k
25 A
17
100 A
2 k
LB1997
Equivalent circuit
20
75 k
50 k
10 k
25 A
20 k
2 k
A11188
5 k
V CC 1
A11187
A11186
V CC 1
13
V CC 1
25 A
14 15
V CC 1
A11184
200
A11185
V CC 1
11
7
9
Source side predrive voltage supply
pin
Constant current control amplifier
voltage supply pin
Power supply pin for all circuits
except output transistors, source
predriver, and low current control
amplifier
Reverse detector pin
1 Hall element waveform Schmitt
comparator composite output
U phase Hall element input and
reverse detector U phase Schmitt
comparator input pin
Logic High indicates U
V phase Hall element input and
reverse detector V phase Schmitt
comparator input pin
Logic High indicates V
W phase Hall element input and
reverse detector W phase Schmitt
comparator input pin
Logic High indicates W
Hall element lower side bias voltage
supply pin
When this pin is at 0.7V or lower, or
when it is open, all circuits are
inactive. When driving motor, set
this pin to 2V or higher.
GND pin for all circuits except
output
Control loop frequency compensa-
tor pin. Connecting a capacitor
between this pin and GND prevents
closed loop oscillation in current
limiting circuitry.
Forward rotation: High
Reverse rotation: Low
Pin function
Continued on next page
IN
IN
IN
1 > V
1 > U
1 > W
No. 5978-7/9
IN
IN
IN
2.
2.
2.