BA6898S データシートの表示（PDF） - ROHM Semiconductor

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BA6898S

4-channel BTL driver for CD players

ROHM Semiconductor 

Optical disc ICs

FCircuit operation

(1) Driver block

The input is the focus and tracking error signals from the

servo pre-amplifier and the control signals for the motor

system. The input signal is normally centered at 2.5V,

and at the pre-amplifier, it undergoes V / I conversion to

generate the current corresponding to the input voltage.

This is then passed through a resistor and sent to the in-

ternal reference voltage block.

BA6898S / BA6898FP

This results in the output from the pre-amplifier being the

signal at the center of the internal reference voltage.

Furthermore, at the V / I conversion, forward and reverse

phases are generated and the BTL output is then gained

through the driver buffer.

(2) Regulator block

The configuration is that of a normal series-type regulator

and the reference voltage is provided internally. A PNP

low-saturation transistor is connected externally.

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