BA5912AFP-Y 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA5912AFP-Y

2-channel BTL driver for CD players

ROHM Semiconductor 

Optical disc ICs

FOperation notes

(1) The BA5912AFP-Y contains a thermal shutdown

circuit. When the chip temperature reaches 175 _C

(Typ.), the output current is muted. If the chip tempera-

ture then drops below 150_C (Typ.), then the mute is re-

leased.

(2) By having the voltage of the mute pins (pins 2 and

13) open or lowered to 0.5V or below, you can indepen-

dently mute the output current for channels 1 and 2. For

normal conditions, have the voltages for the mute pins

(pins 2 and 13) pulled up to 2.0V or greater. If the both

mute pins (pins 2 and 13) are open or 0.5V or less, then

the IC automatically enters the standby mode.

(3) If the voltage of the bias pin (pin 20) drops below

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

have the voltage above 2.0V.

(4) If the power supply voltage drops below 3.5V (Typ.),

internal circuits turn off. If the power supply voltage then

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

FElectrical characteristic curves

BA5912AFP-Y

(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

the internal bias voltage.

(6) When Pre VCC = Pow VCC, have the Vref switch pin

open or at 0.5V or less (internal bias voltage = (Pow

VCC*VF) / 2). When Pre VCC > POW VCC)VF, have the

Vref switch pin pulled up to 2.0V (internal bias voltage =

Pow VCC / 2).

(7) Connect a bypass capacitor (approx. 0.1µF) be-

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

(8) Even though the radiation fins are connected to

ground within the package, be sure to also connect them

to a ground externally as well.

595

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