M63013 データシートの表示（PDF） - Mitsumi

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M63013

SPINDLE MOTOR AND 4CH ACTUATOR DRIVER

Mitsumi 

Preliminary

MITSUBISHI SEMICONDUCTORS

M63013FP

SPINDLE MOTOR AND 4CH ACTUATOR DRIVER

PWM carrier frequency setting

PWM carrier frequency 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 frequency

is given in following table.

Capacitor [pF]

330

Carrier Frequency [KHz] 65

220 180

90 110

130 110

140 160

*note) This PWM carrier frequency is TYP value.

Recommendation of SHORT BRAKE MODE at SPINDLE DRIVE

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 avoid braking down of this IC.

(By excessive reverse torque current in braking a motor with PWM-BRAKE from high-speed-rotation with being excessive

Back-EMF, this IC could be broken.)

The relationship between hall-amplifier-input and output-current-commutation at SPINDLE DRIVE

The relationship between the hall elements and the motor output current is shown in bellow Figure.

Hall

input

Hw+ Hv+ Hu+

Hall elements

UW

V

V

Outer roter

V

U

W

V

+

Output

current 0

-

UW

V

U

W

W

U

U

V

W

REVERSE

SPIN < REF

FORWARD

SPIN > REF

(13 / 17)

REV990607

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