Continued from preceding page.
Pin No. Symbol
Voltage
LB1988N
Function
7
PGOUT2
PG Schmitt amplifier output.
8
BFGO
Motor back EMF detection FG output (3-phase
synthesized).
Equivalent circuit diagram
V REG+VF
V CC
100 µA
5 kΩ
V REG
78
9
LVCC
8 to 13.8 V Loading motor driver output transistor power supply.
10
VREF
0 to VCCL Loading motor driver output voltage setting.
13 15 1 mA
30 kΩ
50 kΩ
10
1 mA
30 kΩ
VCCL
11
XIN
0 V to VREG Loading motor driver logic input.
12
YIN
13
XOUT
15
YOUT
14
LGND
Loading motor driver output.
Loading motor driver output transistor ground.
11
100 kΩ
12
50 kΩ
V REG
50 kΩ
9
2 kΩ
2 kΩ
14
13 15
10
Continued on next page.
No. 6185-7/9