HA13614FH データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HA13614FH

Combo (Spindle & VCM) Driver

Hitachi -> Renesas Electronics 

HA13614FH

Notes: 1. The operation threshold voltage of Vps or Vdd is determined by resistor R101, R102 or R107,

R108 as follows.

POR

(for Vdd)

12VGOOD

(for Vps)

Vdwn

Vup

Vps

• for Vps

Recovery

voltage

Vup(Vps) = (Vsd1 + Vhys3) ⋅

1+

R101

R102

[V]

(1)

Cut off

voltage

Vdwn(Vps) = Vsd1 ⋅

1+

R101

R102

[V]

(2)

where, Vsd1 : Operating voltage of the power monitor [V] (refer to Electrical Charasteristics)

Vhys3 : Hysteresis voltage of the power monitor [V] (refer to Electrical Charasteristics)

• for Vdd

Recovery

voltage

Vup(Vdd) = (Vsd1 + Vhys4) ⋅

1+

R107

R108

[V]

(1)’

Cut off

voltage

Vdwn(Vdd) = Vsd1 ⋅

1

+

R107

R108

[V]

(2)’

where, Vhys4 : Hysteresis voltage of the power monitor [V] (refer to Electrical Charasteristics)

2. The relation between PWMDAC input VIPWMH, VIPWML for VCM driver current control and VCM

driver input (VCMIN – VREF) is determined by following equation. (refer to below figure)

VCMIN − VREF =

6.4

6500

⋅ (64 ⋅ DPWMH + DPWML) − 3.2

(3)

where, VREF

DPWMH

DPWML

: Internal reference voltage [V] (refer to Electrical Charasteristics)

: Duty of input signal on terminal VIPWMH [%]

: Duty of input signal on terminal VIPWML [%]

VREF

VIPWMH

VIPWML

R1L R0

VREF

5.3V

R1H DACOUT R2

R1=R1L//R1H//R0 C1

=740Ω

R3

OP2IN(+) OPAmp.2

+

C2

C3 GND R4

−

R5

OP2OUT

R5/R4=0.604

VCMIN

5.3V

VREF

to VCM driver

VCMIN

5.3±3.2V

3. The 3rd order LPF at next stage of PWMDAC is characterized by internal OP amp. and capacitor

C1, C2, C3 and resistor R2, R3. These components value are determined by following equations.

C1 =

1

2 ⋅ π ⋅ fc ⋅ R1

[F]

(4)

17

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