BA5921FP データシートの表示（PDF） - ROHM Semiconductor

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BA5921FP

4-channel BTL driver for CD player and CD-ROM drives

ROHM Semiconductor 

Optical disc ICs

FOperation notes

(1) The BA5921FP has a thermal shutdown circuit.

The output current is muted when the chip temperature

rises above 175_C (typically). When the chip tempera-

ture falls to 150_C (typically), the driver circuit starts up

again.

(2) The output current can be muted by opening the

mute pin (pin 9) or lowering it below 0.5V. During ordinary

use, pin 9 should be pulled up above 2.0V.

(3) Muting also occurs when the bias pin (pin 2) drops

below 1.4V (typically). Make sure it stays above 1.7V dur-

ing normal use.

BA5921FP

(4) The internal circuits turn off when the supply volt-

age drops below 3.8V (typically), and turn on again when

it rises above 4.0V (typically).

(5) Muting occurs during thermal shutdown, mute-on

operations or a drop in the bias pin voltage or supply volt-

age. In each case, only the drivers are muted. During

muting, the output pins remain at the internal bias volt-

age, roughly (VCC*VF) / 2.

(6) Connect the IC to a 0.1µF bypass capacitor be-

tween power supplies, at the base of the IC.

(7) The radiating fin is connected to the package’s in-

ternal GND, but should also be connected to an external

ground.

FElectrical characteristic curves

276

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