an7191nz Panasonic Corporation of North America, an7191nz Datasheet - Page 16

• Manufacturer Part Number: an7191nz
• Description: Dual 20 W Btl Audio Power Amplifier
• Manufacturer: Panasonic Corporation of North America

AN7191NZ
16
[2] Application note (continued)
11. Two IC use (continued)
Technical Information (continued)
Application Circuit Example
1) Supply terminal
2) Standby terminal (pin 5)
3) Muting terminal (pin 7)
4) Beep sound input terminal (pin 10)
5) Ripple filter terminal (pin 12)
Ch.1 out ( )
Ch.1 out ( )
Ch.1 GND
However, if sufficient characteristics of the ripple rejection can not be obtained, use an even larger capacitor
or insert a 2 200 F capacitor into each IC.
the microcomputer after connecting the standby pins with each other. At that time, the current flowing into the
standby terminal is twice larger the current which is described in 1. Standby function.
and 1/2 time respectively, the time constant value becomes as same as the value when 1 IC is used.
In order to avoid such a phenomenon, connect the ICs with each other through a resistor (47 k ).
circuit after connecting a capacitor (33 F) to each IC.
Short-circuiting each other, insert an electrolytic capacitor of approx. 2 200 F into the supply terminals.
The best sound quality can be obtained by inserting a 2 200 F capacitor near the terminal of each IC.
The connection of standby terminals with each other does not result in an abnormal operation. Connect with
It does not result in the abnormal operation 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
Short-circuit between the beep sound input terminals 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.
Short-circuit between ripple filter terminals 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
3
4
2
ICs for Audio Common Use
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13
15
Ch.2 GND
Ch.2 out ( )
Ch.2 out ( )