Ordering number : ENN6109A
Monolithic Digital IC
LB1987, 1987D, 1987M, 1987H
Three-Phase Brushless Motor Driver for VCR Capstan Motors
Overview
The LB1987, LB1987D, LB1987M, and LB1987H are optimal capstan motor drivers for use in VCR sets.
3147B-DIP28H
[LB1987D]
28 15
Functions
• Three-phase full-wave current-linear drive • Torque ripple correction circuit (fixed correction ratio) • Current limiter circuit with control characteristics gain switching • Oversaturation prevention circuits for both the upper and lower sides of the output stage (No external
capacitors are required.
) • FG amplifier • Thermal shutdown circuit
R1.
7
12.
7 11.
2
8.
4
1
20.
0 27.
0
14
1.
93
1.
78
0.
6
1.
0
4.
0
...