HA13561F Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HA13561F

Combo (Spindle & VCM) Driver

Hitachi -> Renesas Electronics 

HA13561F

11. The frequency response of VCM driver maybe have a gain peaking because of the resonation of

the motor coil impedance. If you want to tune up for this characteristics, you can reduce the

peaking by additional snubber circuit RX and CX as follows.

BTL Driver

+

–

R3

1/2 VPS

– R3

+

N

RX Coil

CX

RS

RS

P

Figure 1 VCM Driver Block Diagram

20

10

IO

0

(dB)

–10

–20

Normal

CX = 0.22µF

RX = 560Ω

100

1k

10k

100k

Frequency (Hz)

(for example) RL = 14.7 Ω, RS = 1 Ω, L = 1.7 mH, Gain = L

12. The retract current Iret is determined by following equation.

Iret = Vretpow – Vsat(Qret) – VF(D1) – VsatVL

R108 + Rs + RL

(28)

where, Vretpow: Applied voltage on pin 78 [V]

Vsat (Qret): Saturation voltage of Qret [V]

VF (D1): Foward voltage of D1 [V]

17

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