LB1987H データシートの表示（PDF） - SANYO -> Panasonic

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LB1987H

Three-Phase Brushless Motor Driver for VCR Capstan Motors

SANYO -> Panasonic 

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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