M63028FP Renesas Electronics Corporation., M63028FP Datasheet - Page 17

• Manufacturer Part Number: M63028FP
• Description: Spindle Motor And 5ch Actuator Driver
• Manufacturer: Renesas Electronics Corporation.

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.
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 sec.
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
current
Output
input
Output
Hall
FG
+
0
-
M63028FP
M63029FP
U
V
Hw+
W
U
Hv+
V
W
Hu+
U
V
W
* The logic of the FG Output waveform (Hi / Lo) synchronized hall
input waveform (V phase) of M63029FP is inverted specification of
M63023FP and M63026FP.
Hall elements
W
V
U
FORWARD
SPIN > REF
U
V
W
W
V
U
Outer roter
SPIN < REF
REVERSE