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Optical disc ICs

BA6797FP / BA6797FM

FApplication example

FOperation notes

(1)

The BA6797FP and BA6797FM have an internal

thermal shutdown circuit. Output current is muted when

the chip temperature exceeds 175

_C (typically).

(2)

If the mute pin (pin 9) voltage is opened or lowered

below 0.5V, the output current will be muted. Pin 15

should be pulled up above 2.0V during normal use. Dur-

ing muting, the output pins remain at the internal bias

(3)

The bias pin (pin 8) is muted when lowered below

1.4V (typically). Make sure it stays above 1.6V during

normal use.

(4)

Be sure to connect the IC to a 0.1

µF bypass capaci-

tor to the power supply, at the base of the IC.

(5)

Connect the radiating fin to an external ground.

(6)

The capacitor between regulator output (pin 7) and

GND also serves to prevent oscillation of the IC, so select

one with good temperature characteristics.