LB1987M View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
Manufacturer
LB1987M Datasheet PDF : 17 Pages
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LB1987, 1987D, 1987M, 1987H
Continued from preceding page.
Pin
Function
Forward/reverse selection.
The direction (forward or reverse) is selected by the voltage applied to this
FR
pin.
(Vth = 2.5 Vtyp at VCC = 5 V)
External torque ripple correction ratio adjustment.
To adjust the correction ratio, apply the stipulated voltage to the ADJ pin FR
from a low-impedance external circuit.
200 Ω
If the applied voltage is increased, the correction ratio falls, and if the applied
ADJ
voltage is lowered, the correction ratio increases.
The range of variation is from 0 to two times the correction ratio when the pin
is left open.
(This pin is set to about VCC/2 internally, and has an input impedance of
about 5 kΩ.)
Equivalent circuit diagram
VCC
200 µA
VCC
VCC
20 µA
VCC
ADJ
1/2
VCC
6 kΩ
500 Ω
6 kΩ
A12210
FGIN–
Input used when the FG amplifier inverting input is used. Connect a
feedback resistor between the FGOUT pin and this pin.
FGIN+
Non-inverting input used when the FG amplifier is used as a differential input
amplifier.
No bias is applied internally.
FGOUT
FG amplifier output.
This pin includes an internal load resistor.
5 µA
FGin(–)
300 Ω
VCC VCC
FGin(+)
300 Ω
VCC
A12211
FGOUT
300 Ω
FC
FC
Speed control loop frequency characteristics correction.
GND
Ground for all systems other than the output transistors.
Note that the lowest potential of the output transistors is determined by the
Rf pin.
FGS
FG pulse output.
This pin includes an internal load resistor.
(The output impedance is about 3 kΩ.)
Power supply for all IC internal circuits other than the output block.
VCC
This power supply must be stabilized to prevent ripple or other noise from
entering the circuit.
GSENSE
Ground sensing.
The influence of the common ground impedance on Rf can be excluded by
connecting this pin to ground near the Rf resistor side of the motor ground
wiring that includes Rf.
(This pin must not be left open.)
A12212
VCC VCC VCC
FGS
A12517
GSENSE
A12518
No. 6109-5/17
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