m63024 Mitsumi Electronics, Corp., m63024 Datasheet - Page 13

• Manufacturer Part Number: m63024
• Description: Spindle Motor And 5ch Actuator Driver
• Manufacturer: Mitsumi Electronics, Corp.

Recommendation of SHORT BRAKE MODE at SPINDLE drive
PWM carrier frequency setting
This IC has two brake mode, PWM-BRAKE-MODE and SHORT-BRAKE-MODE. In this IC recommendation, SHORT-
BRAKE-MODE is superior to PWM-BRAKE-MODE to reducing the power dissipation and to av oid braking down of
this IC.
(By excessiVe rev erse torque current in braking a motor with PWM-BRAKE f rom high-speed-rotation with being
excessiVe Back-EMF, this IC could be broken.)
The relationship between hall-amplifier-input and output-current-commutation/FG output
at SPINDLE drive
PWM carrier f requency is decided by charging and discharging the capacitor that is connected to OSC terminal
outer IC. Examination of the relationship the capacitor connected to OSC terminal and PWM carrier f requency
is giVen in f ollowing table.
The relationship between the hall elements and the motor output current/FG output is shown in bellow Figure.
current
Output
Output
input
Hall
FG
Carrier Frequency [KHz]
+
0
-
Capacitor [pF]
U
V
Hw+
W
U
HV+
V
W
Hu+
U
820
28
V
*note) This PWM carrier frequency is TYP value.
W
750
30
M63023/026FP
M63024/027FP
(
13
SPINDLE MOTOR AND 5CH ACTUATOR driveR
330
65
Hall elements
/
17)
220
90
M63023/024/026/027FP
MITSUBISHI SEMICONDUCTORS
180
110
W
V
U
FORW ARD
SPIN > REF
140
130
U
V
W
W
V
160
110
U
REV010307
Outer roter
SPIN < REF
Reverse