M63020FP Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M63020FP

SPINDLE MOTOR AND 5CH ACTUATOR DRIVER

MITSUBISHI ELECTRIC  

MITSUBISHI SEMICONDUCTORS

M63020FP

SPINDLE MOTOR AND 5CH 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]

820 750 330 220 180 130 110

Carrier Frequency [KHz] 28 30 65 90 110 140 160

*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+

V

U

W

V

+

Output

current 0

-

UW

V

U

W

Hall elements

UW

V

V

W

U

U

W

V

FORWARD

SPIN>REF

Outer roter

REVERSE

SPIN<REF

(13 / 17)

REV990726

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