M56786FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC
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M56786FP Datasheet PDF : 10 Pages
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THE RELATIONSHIP WITH I/O CONTROL AND
THE BRAKING MODE
BRS=LOW
Current limit
REVERSE BRAKING
Reverse Torque
0–+60mV
0.8A/V
0.8A/V
Forward Torque
Figure 1.
0
EC - ECR
0– -60mV
Current limit
MITSUBISHI <CONTROL / DRIVER IC>
M56786FP
SPINDLE MOTOR AND 1CH ACTUATOR DRIVER
The braking mode is selected flexibly by using the BRS terminal.
The relationship between the EC-ECR (the difference between
EC<(control voltage> and ECR<reference voltage>) and the torque
is shown in Figure 1,2 and 3.
The current gain is 0.8A/V(at sensing resistor:0.5ohm) in forward
torque directions, and the dead zone is from0mV to 60mV.
When the reverse brake mode(BRS=Lo) is selected, the coil
current gain under the reverse torque control is the same with in
forward torque directions.
BRS=Hi
SHORT BRAKING
Reverse Torque
When the short brake mode(BRS=Hi) is selected, the coil current
under the reverse torque control depends on the back emf. and the
coil resistance.
0
EC - ECR
0.8A/V
Forward Torque
Figure 2.
0–-60mV
Current limit
BRS=Open
0.8A/V
FREE RUN
0
EC-ECR
0–-60mV
Forward Torque
Figure 3.
Current limit
When the free run mode(BRS=open) is selected, the coil current
under the reverse torque control (EC-ECR>0) becomes zero and in
free run situation.
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