BA6297AFP 查看數據表（PDF） - ROHM Semiconductor

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BA6297AFP

4-channel BTL driver for CD players

ROHM Semiconductor 

Optical disc ICs

FCircuit operation

The BA6297AFP comprises a 4-channel driver, internal

bias amplifier, mute pin and thermal shutdown.

(1) Driver

The driver uses a buffer to output one of the outputs from

its preamplifier with no modification, and uses an inver-

sion amplifier to invert the other output before sending it

to the driver buffer. The inversion amplifier’s reference is

the bias voltage generated internally (pin 7 voltage), and

so the preamplifier output must make the zero level equal

to the internal bias voltage. See Figs. 7 and 8 for exam-

ples.

BA6297AFP

(2) Internal bias amplifier

Configured as shown in Fig. 9. The internal bias voltage

(Vref) is calculated thus :

Vref= VCC*VF

2

(3) Mute pin (pin 15)

The output current is muted when this pin receives the

low level or a high impedance. Set the pin voltage at high

during normal operation.

(4) Thermal shutdown

The BA6297AFP has an internal thermal shutdown cir-

cuit. Output current is muted when the chip temperature

exceeds 175_C (typically).

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