BA6795 データシートの表示（PDF） - ROHM Semiconductor

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BA6795

5-channel BTL driver for CD players

ROHM Semiconductor 

Optical disc ICs

FOperation notes

(1) The BA6795FP has an internal thermal shutdown

circuit. Output current is muted when the chip tempera-

ture exceeds 175_C (typically).

(2) If the mute pin (pin 7) voltage is opened or lowered

below 0.5V, the output current will be muted. Pin 7 should

be pulled up above 2.0V during normal use.

(3) The bias pin (pin 23) is muted when lowered below

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

normal use.

(4) 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.

FElectrical characteristic curves

BA6795FP

(5) The driver circuit shuts down when the supply volt-

age drops below 4.3V (typically), and starts up again

when the voltage rises above 4.5V (typically).

(6) Fluctuation due to temperature occurs in the gain

when using an attached resistor as the input resistor for

a driver other than the spindle driver (typically 2200ppm

per degree) or for the spindle driver (typically 4600ppm

per degree. (Only when using the gain adjustment pin.)

(7) Be sure to connect the IC to a 0.1µF bypass capaci-

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

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

ternal GND, but should also be connected to an external

ground.

(9) The capacitor between regulator output (pin 6) and

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

one with good temperature characteristics.

481

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