BA6896 Ver la hoja de datos (PDF) - ROHM Semiconductor

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BA6896

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. The input signals, which normally center on 2.5V, are

V / I converted by the preamplifier, generating a current

corresponding to the input voltage. This current is

BA6896FP

passed through a resistor and into the internal reference

voltage component, the preamplifier output being a sig-

nal centering on the internal reference voltage. Two sys-

tems (positive phase and negative phase) are created

during V / I conversion, generating BTL output via the

driver buffer.

(2) Regulator

This is a typical series regulator that generates a refer-

ence voltage internally. A PNP low saturation transistor

must be connected.

(3) Operational amplifier

A standard 4558 type.

387

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