M56784 Mitsubishi, M56784 Datasheet - Page 8

• Manufacturer Part Number: M56784
• Description: SPINDLE MOTOR DRIVER
• Manufacturer: Mitsubishi

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.
Figure 8.
FORWARD
CURRENT
REVERSE
TORQUE
CURRENT
BRAKING
MODE
ECR
MODE2
MODE1
CASE 1
HIGH
LOW
LOW
+1A
3.0V
2.5V
-1A
5.0V
2.0V
0V
REVERSE AND COMMUTATED
SHORT BRAKING SELECT
EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]
-600mA
MOTOR CURRENT [ Rsense = 0.5 ohm]
Commu-
tated short
BRAKING
REVERSE
BRAKING
+600mA
MOTOR
STOP
FORWARD
CURRENT
REVERSE
TORQUE
CURRENT
BRAKING
MODE
ECR
MODE2
MODE1
HIGH
LOW
LOW
+1A
3.0V
2.5V
5.0V
2.0V
-1A
0V
CASE 2
REVERSE AND ALL SHORT BRAKING SELECT
EC PIN INPUT VOLTAGE [ECR VOLTAGE = 2.5V]
MOTOR CURRENT
MITSUBISHI <CONTROL / DRIVER IC>
ALL
SHORT
BRAKING
(Vbemf-Vd-Vsat) / Ra
Vsat ; npn transistor saturation voltage
Vd ; diode voltage
Ra ; motor inner resistance
-600mA
SPINDLE MOTOR DRIVER
REVERSE
BRAKING
+600mA
MOTOR
STOP
M56784FP