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M56785FP

SPINDLE MOTOR DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M56785FP

SPINDLE MOTOR DRIVER

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.

CASE 1

CASE 2

REVERSE AND COMMUTATED

SHORT BRAKING SELECT

EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]

5.0V

REVERSE AND ALL SHORT

BRAKING SELECT

EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]

5.0V

3.0V

ECR 2.5V

2.0V

3.0V

ECR 2.5V

2.0V

0V

HIGH

MODE2

LOW

MODE1

LOW

BRAKING

MODE

+1A

FORWARD

CURRENT

REVERSE

TORQUE

CURRENT

-1A

Commutat-

ed short

BRAKING

REVERSE

BRAKING

MOTOR CURRENT [ Rsense = 0.5 ohm ]

+60 0mA

-60 0mA

MOTOR

STOP

Figure 8.

0V

HIGH

MODE2

LOW

MODE1

LOW

BRAKING

MODE

+1A

FORWARD

CURRENT

REVERSE

TORQUE

CURRENT

-1A

ALL

SHORT

BRAKING

MOTOR CURRENT

REVERSE

BRAKING

+60 0mA

-60 0mA

MOTOR

STOP

( Vbemf-Vd-Vsat ) / Ra

Vd ; diode voltage

Vsat ; npn transistor saturation voltage

Ra ; motor inner resistance

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