TA8216HQ データシートの表示（PDF） - Toshiba

部品番号

コンポーネント説明

メーカー

TA8216HQ

Dual Audio Power Amplifier

Toshiba 

TA8216HQ

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 1st 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

Q6

Q4 Q5

D1

D2

9 VCC

20 kΩ

7/12 OUT

11

8

Mute

2/4

1/5

IN

NF

Figure 3

3. Precaution for 4 Ω load resistance use

Internal output current detection and protection circuit protect the IC from the influence of unusual excess

current. And this function causes the interrupted sound in case of excess input voltage with VCC higher

than recommended supply voltage (24V).

Therefore, the power supply regulation must be fully investigated so as not to make the VCC be high than

recommendation supply voltage (24V).

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

2004-08-25

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