ha13561f Renesas Electronics Corporation., ha13561f Datasheet - Page 16

• Manufacturer Part Number: ha13561f
• Description: Combo Spindle & Vcm Driver
• Manufacturer: Renesas Electronics Corporation.

HA13561F
where,
10. The relationship between the output current Ivcm and the input voltage (Vctl – V
Ivcm(s) = Vctl – V
where, Vctl:
where,
where,
and from above equations the -3 dB bandwidth f
Hvcm(s) =
f
is as follows.
VCMC
VCM
O
n =
=
VCM
=
C4 • (R3 + R4) – C3 • R3 •
C5 • R//
=
=
=
C3 • C4 • R3 • R4
2 • C3 • C4 • R3 • R4
V
Kvcm:
Hvcm(s): Transfer function of VCM driver as shown following equation
Lm: Inductance of the VCM coil [H]
R
1
1
2
REF1
p: Bandwidth of internal power amplifiers for VCM driver [rad/s]
L
:
2 •
1 + 2 •
VCM
:
• 1 +
P
(= 3• •10
Resistance of the VCM coil [ ]
1
•
Input control voltage for VCM driver on pin 64 [V]
Reference voltage on pin 61 [V] (= 4.6)
DC gain of VCM driver
(= 1.82 for High gain mode)
(= 0.45 for Low gain mode)
Lm
•
REF1
Rs
VCM
Rs
R
6
L
)
1 – 2 •
• Kvcm •
•
1
VCM
•
s
R6
R5
VCM
+
Rs
1
1
P
2
VCM
s
• Hvcm(s)
•
+
Lm
2
Rs
16
2 •
VCMC
VCM
of VCM driver is as following equation.
2
– 1
2
+ 1
REF1
) on VCM driver
(20)
(21)
(22)
(23)
(24)
(25)
(26)
(27)