AN7195Z Просмотр технического описания (PDF) - Panasonic Corporation

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AN7195Z

Dual 15 W BTL power IC for car audio

Panasonic Corporation 

AN7195Z

ICs for Audio Common Use

s Technical Information (continued)

[2] Application note (continued)

8. Mute Function

1) The mute-on/off is possible by making pin 7 (the muting terminal) high or low.

2) The muting circuit is as shown in figure 6. The amplifier gain including attenuator block is given in the

following equation :

GV =

I1

I2

× 50←

Original gain

From the above equation, the amplifier gain can be made as 0 time by setting I1 at 0 mA at muting.

3) The threshold voltage of VMUTE is as follows :

Mute-off : approx. 1 V or less

Mute-on : approx. 3 V or more

I1

I2

5V

VMUTE

Mute/on

Input

4.7 kΩ

7

0V

Mute/off 10 µF

5 kΩ

Output stage

I1

I2

Attenuator block

Output stage

I1 = approx.120 µA

I2 = approx.120 µA

Figure 6

4) Attack time and recovery time can be changed by the external CR of pin 7. For recommended circuits (In

figure 6 4.7 kΩ,10 µF), the above mentioned times are as follows :

Attack time : Approx. 30 ms

Recovery time : Approx. 40 ms

However, the control voltage of VMUTE is assumed to be 5 V. When it is not directly controlled by

microcomputer (5 V), (that is, 13.2 V separate power supply), it is necessary to change CR values because the

above times change.

5) When the attack time and recovery time are set at 20 ms or less, pay attention to the IC with larger output

offset because it may release the shock noise.

9. Voltage gain

The voltage gain is fixed at 34 dB and can not be changed by the addition of an external resistor.

10

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