m63021fp Mitsumi Electronics, Corp., m63021fp Datasheet - Page 9

• Manufacturer Part Number: m63021fp
• Description: Spindle Motor Actuator Driver
• Manufacturer: Mitsumi Electronics, Corp.

the torque is shown in right Figure. The voltage gain[Gvo] is 1.0 [V/V].
R1= ,R2=0ohm) in forward torque directions, and the dead zone is from 0mV
to 80mV (at R1= ,R2=0ohm) .
torque directions.And the limitation function gets on when the differential
voltage of VM1(12V) to RSP is 0.5V.
Therefore current-gain-control and current-limit of this IC is determined with
sensing resister value, and more detail control can be determined with setting
a gain-resister outer this IC as below.
The relationship between the differential voltage between SPIN and REF and
The current gain[Gio] is 2.0[A/V] (at sensing resistor : 0.5 ohm,and
The coil current gain under the reverse torque is the same with in forward
SPINDLE channel
Preliminary
The example of current-gain and current-limit of SPINDLE.
Rs [ ]
0.50
0.75
1.00
1.65v
CTL
Ilim1F
1.00
0.66
0.50
[A]
Ilim1R
0.56
0.37
0.28
[A]
R2
R1
R1=
R2=0 ohm
2.00
1.33
1.00
Gio*= R1 / [(R1+R2) • Rs] [A/V]
SPIN
REF
Rs
RSP
VM1
Gio* [A/V]
R1=R2
GND
1.00
0.66
0.50
SPINDLE MOTOR AND 5CH ACTUATOR DRIVER
(
HW+
HU+
HV+
HW-
9
HU-
HV-
HB
R1=2 • R2
W
U
V
/
0.66
0.44
0.33
17)
Rh
MITSUBISHI SEMICONDUCTORS
5V
Reverse Torque
Dead zone
current limit
Gio
M63021FP
lim1F
M
current limit
REV990728
lim1R
Forward Torque
Dead zone
CTL -REF (V)
Gio