LB1995 Datasheet, PDF (7/9 Pages) Sanyo Semicon Device – Three-Phase Brushless Motor Driver for CD-ROM Spindle Drive

LB1995
Pin Descriptions
Pin number Pin name Pin voltage
3
V_CC2
4V to 13.6V
4
V_CC3
4V to 13.6V
6
V_CC1
4V to 6V
14
RS
15
FG
8
U_IN1
7
U_IN2
10
V_IN1
1.2V to
9
V_IN2
V_CC1–1V
12
W_IN1
11
W_IN2
13
V_H
17
S/S
0V to V_CC1
18
SIG GND
20
FC
Equivalent circuit
100µA
10 kΩ
VCC1
14 15
8
200Ω
10
12
25µA
75µA
A11127
25µA
VCC1
25µA
7
9
200Ω ₁₁
A11128
VCC1
13
Pin function
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
Forward rotation: High
Reverse rotation: Low
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_IN1 > U_IN2.
V phase Hall element input and
reverse detector V phase Schmitt
comparator input pin
Logic High indicates V_IN1 > V_IN2.
W phase Hall element input and
reverse detector W phase Schmitt
comparator input pin
Logic High indicates W_IN1 > W_IN2.
Hall element lower side bias voltage
supply pin
30 kΩ
2 kΩ
75 kΩ
17
50 kΩ
A11129
VCC1
A11130
VCC1
2 kΩ
20
20 kΩ 5 kΩ
A11131
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.
Continued on next page
No. 5976-7/9