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| 型號： | LB1987M |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 1.3 A, PDSO36 |
| 封裝： | MFP-36 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 274K |
| 代理商： | LB1987M |
No. 6109-5/17
LB1987, 1987D, 1987M, 1987H
Continued from preceding page.
Pin
Function
Equivalent circuit diagram
Forward/reverse selection.
The direction (forward or reverse) is selected by the voltage applied to this
pin.
(Vth = 2.5 Vtyp at VCC = 5 V)
FR
A12210
200Ω
FR
200μA
1/2
VCC
ADJ
10k
Ω
6kΩ
10k
Ω
500Ω
6kΩ
10k
Ω
10k
Ω
20μA
Input used when the FG amplifier inverting input is used. Connect a
feedback resistor between the FGOUT pin and this pin.
FGIN–
300 Ω
5 μA
FGin(–)
FGin(+)
A12211
10
k
Ω
2
k
Ω
300 Ω
100
Ω
FGOUT
VCC
10
k
Ω
FC
A12212
10
k
Ω
5
k
Ω
FGS
VCC VCC
VCC
A12517
13.2
k
Ω
GSENSE
A12518
Non-inverting input used when the FG amplifier is used as a differential input
amplifier.
No bias is applied internally.
FGIN+
FG amplifier output.
This pin includes an internal load resistor.
FGOUT
Speed control loop frequency characteristics correction.
FC
Ground for all systems other than the output transistors.
Note that the lowest potential of the output transistors is determined by the
Rf pin.
GND
FG pulse output.
This pin includes an internal load resistor.
(The output impedance is about 3 kΩ.)
FGS
Power supply for all IC internal circuits other than the output block.
This power supply must be stabilized to prevent ripple or other noise from
entering the circuit.
VCC
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.)
GSENSE
External torque ripple correction ratio adjustment.
To adjust the correction ratio, apply the stipulated voltage to the ADJ pin
from a low-impedance external circuit.
If the applied voltage is increased, the correction ratio falls, and if the applied
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.)
ADJ
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