M56755AFP 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M56755AFP

SPINDLE MOTOR DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M56755AFP

SPINDLE MOTOR DRIVER

REVERSE TORQUE MODE SELECT FUNCTION

At the 4 times speed and the 6 times speed CDROM drive system,

the reverse braking style has been used for the reverse torque.

However, at the 8 times speed CDROM drive system, the motor

current will be needed above 0.7A, if an user of driver IC require a

high speed access time.

If the reverse braking is used at 0.7A, the IC junction temperature

will be too much high.

Therefore, MITSUBISHI new motor driver has the braking mode

select function. This mode select function is available in order to

control flexibly in match with the situation of junction temperature.

Figure 7 shows the reverse torque mode select function table.

If you hope original (the reverse braking) style, please only select

REVERSE BRAKING mode [MODE1 = LOW or OPEN and

MODE2 = HIGH] at external. If it is possible to get two more port

from µcom, you can flexibly control the four kinds of BRAKING

MODE. If you can only get one more port, you can control only the

MODE2. Then, you can control the two kinds of BRAKING MODE

[commutated short or reverse] under the MODE1 is set to LOW or

OPEN.

BRAKING MODE (ECR < EC) SELECT FUNCTION TABLE

MODE1

LOW or OPEN

HIGH

MODE2

LOW

or

OPEN

HIGH

COMMUTATED SHORT

BRAKING

REVERSE BRAKING

SHOARLTLBSRHAOKRINTG (2)

BRAKING

OUTPUT OPEN

[only inertia]

Figure 7.

Figure 8 shows an example for the reverse torque

mode select.

The CASE1 is an controlling example for REVERSE

and COMMUTATED SHORT BRAKING.

The CASE2 is an controlling example for REVERSE

and ALL SHORT BRAKING.

CASE 1

REVERSE AND COMMUTATED SHORT

BRAKING SELECT

EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]

5.0V

3.0V

ECR 2.5V

2.0V

0V

HIGH

MODE2

LOW

MODE1

LOW

BRAKING

MODE

+1A

FORWARD

CURRENT

REVERSE

TORQUE

CURRENT

-1A

Commu-

tated short

BRAKING

REVERSE

BRAKING

MOTOR CURRENT [ Rsense = 0.5 ohm]

+600mA

-600mA

MOTOR

STOP

Figure 8.

CASE 2

REVERSE AND ALL SHORT BRAKING SELECT

EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]

5.0V

3.0V

ECR 2.5V

2.0V

0V

HIGH

MODE2

LOW

MODE1

LOW

BRAKING

MODE

+1A

FORWARD

CURRENT

REVERSE

TORQUE

CURRENT

-1A

ALL

SHORT

BRAKING

MOTOR CURRENT

REVERSE

BRAKING

+600mA

-600mA

MOTOR

STOP

(Vbemf-Vd-Vsat) / Ra

Vd ; diode voltage

Vsat ; npn transistor saturation voltage

Ra ; motor inner resistance

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