HA13561F データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA13561F

Combo (Spindle & VCM) Driver

Hitachi -> Renesas Electronics 

HA13561F

where,

ωO

=

C5

1

•

R//

(20)

ωn =

1

C3 • C4 • R3 • R4

(21)

ζ

=

C4

•

(R3

+

R4)

–

C3

•

R3

•

R6

R5

2 • C3 • C4 • R3 • R4

(22)

10. The relationship between the output current Ivcm and the input voltage (Vctl – V ) REF1 on VCM driver

is as follows.

Ivcm(s) =

Vctl – VREF1

• Kvcm • 1

Rs

• Hvcm(s)

(23)

where, Vctl: Input control voltage for VCM driver on pin 64 [V]

VREF1: Reference voltage on pin 61 [V] (= 4.6)

Kvcm: DC gain of VCM driver

(= 1.82 for High gain mode)

(= 0.45 for Low gain mode)

Hvcm(s): Transfer function of VCM driver as shown following equation

Hvcm(s) =

1

1 + 2 • ζVCM •

s

ωVCM

+

s

ωVCM

2

(24)

where,

ωVCM =

ωP •

Rs

Lm

(25)

ζVCM =

1

2

• 1+

RL

Rs

•

1

ωP

•

Rs

Lm

(26)

where, ωp: Bandwidth of internal power amplifiers for VCM driver [rad/s]

(= 3•π•106)

Lm: Inductance of the VCM coil [H]

RL: Resistance of the VCM coil [Ω]

and from above equations the -3 dB bandwidth fVCMC of VCM driver is as following equation.

fVCMC =

ωVCM

2•π

•

1 – 2 • ζVCM2 +

2

2 • ζVCM2 – 1 + 1

(27)

16

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