HA13568AT 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HA13568AT

CD-ROM Combo Driver

Hitachi -> Renesas Electronics 

HA13568AT

5. The PWM oscillation frequency fpwm is determined by the following equation.

fpwm =

Vrt

8 Ct3 Rt (Vhct3 − Vlct3)

Where, Vhct3 : CT3 pin high voltage (≈ 3.3 V)

Vlct3 : CT3 pin low voltage (≈ 1.3 V)

6. The C103 to C105 for B-EMF filter are determined by the following equation.

21

≤ C103 ≤

35

π ⋅ Rflt ⋅ No ⋅ P

π ⋅ Rflt ⋅ No ⋅ P

Where, Rfill : B-EMF detection output resistor (See the electrical characteristics)

No : Maximum rotation speed (rpm)

7. The FCS and TRR is determined by the following equation.

Voltage drive:

Gv = R1

Rin + R2

Current drive:

Gm =

R1

((Rin + R2) ⋅ Rs)

Where, R1

R2

Rin

: Resistor of IC inside (≈30kΩ)

: Resistor of IC inside (≈7kΩ)

: Resistor value inserted in the input (Ω)

(R110 to R113)

Rs : Current sense resistor (Ω)

8. The output voltage Vout of voltage regulator is determined by the following equation.

Vout = 3.3

1+

Rr1

Rr2

13

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