BA6997FM Просмотр технического описания (PDF) - ROHM Semiconductor

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BA6997FM

5-channel BTL driver for CD and MD Players

ROHM Semiconductor 

Optical disc ICs

FOperation notes

(1) The BA6997FP and BA6997FM have an internal

thermal shutdown circuit. Output current is muted when

the chip temperature exceeds 175_C (typically).

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

mute pin (pin 9) voltage or lowering it below 0.5V. This pin

should be pulled up above 2.0V during normal operation.

When muting occurs, the output pins output the internal

bias voltage, roughly VCC / 2.

(3) The regulator can be turned off by opening the reg-

ulator switch (pin 10) or lowering it below 0.5V. This pin

should be pulled up above 2.0V during normal operation.

(4) Muting also occurs when the bias pin (8 pin) voltage

drops below 1.4V (typically). This pin should stay above

1.6V during normal operation.

(5) Attach a bypass capacitor (roughly 0.1µF) to the

power supply, at the base of the IC.

(6) Be sure to connect the radiating fin to an external

ground.

BA6997FP / BA6997FM

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

REGGND (pin 7) also serves to prevent oscillation of the

IC, so select one with good temperature characteristics.

(8) We recommend 2SB1132 as the PNP transistor to

attach to the regulator.

(9) The internal circuitry of the temperature monitor pin

is shown in the diagram below. Note that the internal ref-

erence voltage is also used for the 5V regulator, which

will cease to operate normally when the temperature

monitor pin emits a current exceeding the regulator’s ca-

pacity. Set I to several dozen µA.

FElectrical characteristic curves

408

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