M56784 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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M56784

SPINDLE MOTOR DRIVER

MITSUBISHI ELECTRIC  

REVERSE TORQUE MODE SELECT FUNCTION

Figure 8 shows an example for the reverse torque mode select.

The CASE1 is an example for controlled REVERSE and

COMMUTATED SHORT BRAKING.

The CASE2 is an example for controlled REVERSE and ALL

SHORT BRAKING.

MITSUBISHI <CONTROL / DRIVER IC>

M56784FP

SPINDLE MOTOR DRIVER

CASE 1

REVERSE AND COMMUTATED

SHORT BRAKING SELECT

5.0V

EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]

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

5.0V

3.0V

ECR 2.5V

2.0V

0V

HIGH

MODE2

LOW

MODE1

LOW

BRAKING

MODE

+1A

FORWARD

CURRENT

REVERSE

TORQUE

CURRENT

-1A

EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]

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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