604

Optical disc ICs

BA5915FP

FOperation notes

(1)

The BA5915FP contains a thermal shutdown cir-

cuit. When the chip temperature reaches 175

_C (Typ.),

the output current is muted. If the chip temperature then

drops below 150

_C (Typ.), then the mute is released.

(2)

By having the mute pin (pin 7) voltage pulled up to

2.2V or greater, you can mute the output current for chan-

nel 1 (between pins 1 and 2). For normal conditions, have

pin 7 open or at 0.4V or below.

(3)

If the voltage of the bias pin (pin 23) drops below

1.4V (Typ.), outputs are muted. For normal conditions,

have the voltage above 1.7V.

(4)

If the power supply voltage drops below 3.8V (Typ.),

internal circuits turn off. If the power supply voltage then

rises to 4.0V (Typ.), the circuits turn on.

(5)

If the voltage of the thermal shutdown, mute ON, or

bias pin drops, or if the power supply voltage drops, the

mute is activated; however, in these situations, only the

drivers are muted. Also, the output pin voltage becomes

(6)

Connect a bypass capacitor (approx. 0.1

µF) be-

tween the bases of the power supply pins of this IC.

(7)

Even though the radiation fins are connected to

ground within the package, be sure to also connect them

to a ground externally as well.

FElectrical characteristic curves