AN7199 查看數據表（PDF） - Panasonic Corporation

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AN7199

Dual 20 W BTL power IC for car audio

Panasonic Corporation 

AN7199Z

ICs for Audio Common Use

s Technical Information (continued)

[2] Application note (continued)

11. Two IC use (continued)

1) Supply terminal

Short-circuiting each other, insert an electrolytic capacitor of approx. 2 200 µF into the supply terminals.

However, if sufficient characteristics of the ripple rejection can not be obtained, use an even larger capacitor

or insert a 2 200 µF capacitor into each IC.

The best sound quality can be obtained by inserting a 2 200 µF capacitor near the terminal of each IC.

2) Standby terminal (pin 5)

Even if the standby terminals are connected with each other, that does not result in an abnormal operation.

Connect with the microcomputer after connecting the standby pins with each other. At that time, the current

flowing into the standby terminal is twice as large as the current which is described in 1. Standby function.

3) Muting terminal (pin 7)

An abnormal operation does not occur even if the muting terminals are short-circuited with each other.

The muting time constant changes when two ICs connection is made. If the CR constants are set at twice

and 1/2 time respectively, the time constant value becomes as same as the value when one IC is used.

In terms of safety design, taking advantage of the fact that a large current is difficult to flow when the mute

is being applied so that it is difficult to cause the destruction, it is designed so that the mute terminal will

become High when an abnormality such as the short-circuit to VCC or short-circuit to GND takes place. (To

avoid the influence of IC in an abnormal state when using two ICs).

Do not connect a microcomputer directly to the mute terminal because the mute terminal voltage rises to

approx. 12 V at that time.

4) Beep sound input terminal (pin 10)

Even if the the beep sound input terminals are short-circuited each other, that does not result in an abnormal

operation.

However, if there is a temperature difference between ICs, there may be a fluctuation of the output offset.

In order to avoid such a phenomenon, connect the ICs with each other through a resistor (47 kΩ).

5) Ripple filter terminal (pin 12)

Even if the ripple filter terminals are short-circuited each other, that does not result in an abnormal

operation.

However, if the standby of each IC is individually controlled, the short-circuiting is not allowed. Use the

circuit after connecting a capacitor (33 µF) to each IC.

12. Precautions on misuse

1) Erroneous connection in the case of short-circuit to VCC and short-circuit to GND or load short-circuit

The AN7198Z, AN7199Z have the breakdown voltage of 20 V or higher when an short-circuit to VCC and

short-circuit to GND or load short-circuit occur. However, there is a possibility of destruction, then smoke

emission and ignition under a special condition. Avoid misuse and erroneous connection of the circuit.

2) Power supply surge

The power supply surge breakdown voltage is evaluated by the test circuit shown in figure 10 and the surge

waveform as shown in figure 11 is evaluated.

The withstanding capability against power supply surge is 80 V for the AN7198Z, AN7199Z.

1 Ω (allowance: ±1%) 20 W

VP

0.63 VP

Surge voltage

D.U.T

0.37 VP

0V

1 ms

Figure 10. Power supply surge test circuit

6 ms

Figure 11. Surg1e00wmavseform

16

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