BA6897S データシートの表示（PDF） - ROHM Semiconductor

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BA6897S

4-channel BTL driver for CD players

ROHM Semiconductor 

Optical disc ICs

FCircuit operation

(1) Driver

Inputs to the IC are the focus tracking error signal from

the servo preamplifier and the control signal from the mo-

tor.

BA6897S / BA6897FP

The input signals, which normally center on 2.5V, are V / I

converted by the preamplifier, generating a current corre-

sponding to the input voltage. This current is passed

through a resistor and into the internal reference voltage

component, the preamplifier output being a signal cen-

tering on the internal reference voltage. Two systems

(positive phase and negative phase) are created during

V / I conversion, generating BTL output via the driver buff-

er.

(2) Regulator

This is a typical series regulator that generates a refer-

ence voltage internally. A PNP low saturation transistor

must be connected.

(3) Amplifier

General 4558 type.

398

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