M63028FP データシートの表示（PDF） - Renesas Electronics

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M63028FP

Spindle Motor and 5ch Actuator Driver

Renesas Electronics 

M63028/029FP

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/FG output at

Spindle Drive

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

Hall

input

Hw+ Hv+ Hu+

V

U

W

V

+

Output 0

current -

UW

V

M63028FP

U

W

FG

Output M63029FP

Hall elements

UW

V

V

W

U

U

W

V

Outer roter

REVERSE

SPIN < REF

FORWARD

SPIN > REF

* The logic of the FG Output waveform (Hi / Lo) synchronized hall

input waveform (V phase) of M63029FP is inverted specification of

M63023FP and M63026FP.

FG function at Spindle Drive

The FG terminal outputs the square pulse signal synchronizing with the Hall inputs timing.

And,the FG terminal is open- collector output.

Phase delay circuit at Slide

Phase delay circuit is built in the IC to detect an output spike current, when the motor current direction is switching.

In switching the motor current direction, Phase delay circuit switch-off all output transistor of H-bridge for 3 µsec.

Output current setting at Slide

In this IC,since output transistor is NPN- type transistor,motor coil current (Io)is larger than sensing resistance current

about 10mA (TYP.)according to base current of output transistor.

Therefore please design output current with consisting these base current.

Rev.1.0, Sep.16.2003, page 17 of 21

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