HA13631T Datasheet, PDF (11/20 Pages) Hitachi Semiconductor – CD-ROM Combo Driver

HA13631T
External Components
Parts No.
Reccomended Reccomended
Value
Range
Purpose
Note
R101a~d
2.4 kΩ
≤ 22 kΩ
Filter resistor and atenuation for B-EMF
1
R102a~d
7.5 kΩ
≤ 22 kΩ
Filter resistor and atenuation for B-EMF
1
R103, R104 —
≤ 220 kΩ
for FCS driver gain setting
R105, R106 —
≤ 220 kΩ
for TRK driver gain setting
R107, R108 —
≤ 220 kΩ
for SLD driver gain setting
R109, R110 —
≤ 220 kΩ
for TRY driver gain setting
5
Rnf
0.25 Ω
≥ 0.25 Ω
SPN driver current detection resistor
2
Rt
6.8 kΩ
≥ 5 kΩ
Reference current setting
C101
—
≥ 0.1 µF
for Power supply by passing
C102
0.1 µF
—
for Booster pumping
C103
0.47 µF
—
for Booster output smoothing
C104
2200 pF
—
for PWM carrier oscillation DC level adjustment
C105a~d
0.1 µF
—
for B-EMF filter
1
Ct1
100 pF
—
Time constant for CLK oscillation
3, 4
Ct2
400 pF
—
PWM carrier generation time constant
3, 4
Notes: 1. The values of R101a~d, R102a~d, and C105a~d are determined by the following equation.
Where, Nomax : Maximum rotation speed (rpm)
P
: Number of spindle motor poles (Total number of S poles and N poles)
R101
R102
≥
1
4
(at Vspn = 5 V)
C105x =
11
Nomax P
1
R101x
+
1
R102x
2. The output current maximum value Iospnmax of SPN driver is controlled according to the
following equation. However, Vspncl is the current limiter reference voltage. (See the electrical
characteristics)
Iospnmax =
Vspncl
Rnf
3. The CLK oscillation frequency fclk and Rt1 ⋅ Ct1 are related by the following equation.
fclk
=
2
Ct1
Rt
Vrt
(Vct1h
−
Vct1l)
Where, Vrt : RT pin voltage (See the electrical characteristics)
Vct1h : CT1 pin high voltage (See the electrical characteristics)
Vct1l : CT1 pin low voltage (See the electrical characteristics)
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