HA13614FH 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HA13614FH

Combo (Spindle & VCM) Driver

Hitachi -> Renesas Electronics 

HA13614FH

8. The delay time of the power monitor for start up is as follows.

tpor = 140 ⋅ C105

[ms]

(15)

9. The cut off frequency fcpwm of the filter for current control input of the spindle motor is as

follows.

fcpwm

=

2π

×

1

20k

⋅

C103

[Hz]

(16)

10. To get the maximum driving efficiency for spindle motor, the capacitor C101, C102 should be

chosen as following equation.

C101 = 0.8 ⋅ C102

(17-1)

C102 =

tan(π/6)

2π ⋅ 13k

⋅

1

fbemf

[F]

(17-2)

fbemf : Back EMF frequency at standard rotation speed of the spindle motor [Hz]

where, please set the value of C101, C102 so that C101 < C102 can be kept including the

accuracy of the absolute value to assure the stability of motor starting and speed lock state.

11. To stabilize output voltage od retract driver, the capacitor C115 should be chosen as following

equation. Please chose same values for C115.

C115 =

3 ⋅ 10−6

2π ⋅ (R105 // R106)

[F]

(18)

12. Time tBRKDLY of the delayed brake of V, W phase for retract is determined by resistor R109 and

capacitor C112, C116 as following equation.

tBRKDLY = −

C116 ⋅ R109

1 + C116

⋅ ln

1−

Vthb

VBRK0

⋅

1+

C116

C112

[s]

C112

(19)

where, Vthb : Threshold voltage that output MOS transistor of spindle motor driver is

operated.

VBRK0 = Vpss – 0.7 [V]

Vpss : +12 V power supply for spindle motor driver

and, please select capacitor C112 and C116 that the ratio of C112/C116 is more than 3 times,

because the last voltage of BRK and BRKDLY terminals falls if the value of C116 is big for C112,

and effect of brake goes down.

19

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