TA8200AH 데이터 시트보기 (PDF) - Toshiba

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TA8200AH

Dual Audio Power Amplifier

Toshiba 

TA8200AH

2. Muting

(1) Audio muting

This IC is possible to make audio muting operation by using 11 pin muting terminal. In Fig. 3, the

equivalent circuit in the muting circuit section is shown.

By means of reducing the voltage of 11 pin down to 2.8 V or less in Fig. 3, Q1 is turned ON and the

base voltage of Q2 in the differential circuit fabricated with Q2 and Q3.

Therefore, with the voltage reduction of 11 pin, the input circuits of dummy of input terminal and

that in the doted line operate and cut-off the input signal.

After muting, the bias circuit continues is operation and the power supply current of quiescent time.

8 pin, the capacitor terminal for reducing the pop noise can reduce the pop noise through making the

time constant longer by means of inserting the capacitor externary.

In the care this terminal is not used, short 8 pin with 11 pin.

The voltage of 11 pin set up to 4 V or more.

(2) IC internal muting at VCC OFF

When VCC = 8 V or less at VCC off, the detection circuit at VCC off is operated. And the base voltage

of Q1 is reduced and the muting operation is mode.

Reference

voltage

The detection

circuit at

VCC ® OFF

Q1

I1

I2

I3 I4 I5

I6

Q2 Q3

D1

Q6

D2

Q4 Q5

9 VCC

20 kW

7/12 OUT

11

8

Mute

2/4

1/5

IN

NF

Figure 3

Cautions

This IC is not proof enough against a strong E-M field by CRT which may cause malfunction such as leak.

Please set the IC keeping the distance from CRT.

3

2002-02-13

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