M56755FP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M56755FP

SPINDLE MOTOR DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M56755FP

SPINDLE MOTOR DRIVER

FORWARD AND REVERSE ROTATION DETECT

Figure 5 shows the circuits and function of the forward and reverse

rotation detect.

The RDS is the output signal pin that detected by the signal of hall

inputs (Hu+,Hu-,Hv+ and Hv-). The RDS pin is pulled-up to VCC1

by internal resistor (typ. 10kohm). When the motor is spinning at

forward, the RDS pin output will be a low level. When the rotation

of motor is reversed at stop mode, it will be a high level.

AUTOMATICALY STOP AFTER REVERSE BRAK-

ING

Figure 5 shows the automaticaly stop circuits after the reverse

braking, too. Figure 6 shows its function table. The MODE3 is the

input pin in order to be selected either the automaticaly stop or

non-stop. When the MODE3 is open, the motor rotation will be

stopped automaticaly after the reverse braking in order to make

stop the motor. When the MODE3 is connected to GND, the motor

will continue the reversed rotation. This mode [MODE3=GND] is

available for the case that an user hope to control the motor

stopping at external.

FG FUNCTION

Figure 5 shows the circuits and function of the frequency genera-

tor, too. The FG is the pin that output the signal synchronize with

the hall inputs [Hv+ and Hv-] timming.

The FG pin is pulled-up to VCC1 by internal resistor [typ.10Kohm].

MODE3

OPEN or HIGH

GND

AUTOMATIC

STOP

UN-AUTOMATIC

(NON-STOP)

Figure 6.

RDS

MODE3 FG

VCC1

VCC1

CI

FG-amp

QD

QT

R

Hu+ Hu- Hv+ Hv- Hw+ Hw-

+

-

+

-

Hall sensor-amp

Figure 5.

FORWARD Hw+

Hv+

Hu+

EC-ECR

REVERSE Hw+

Hu+

Hv+

Comparator

Hysteresis

D

T

Q

High

RDS

Low

FG High

Low

D

T

Q

High

RDS

Low

High

FG

Low

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