AN7195 Panasonic Semiconductor, AN7195 Datasheet - Page 12

• Manufacturer Part Number: AN7195
• Description: Dual 15 W BTL power IC for car audio
• Manufacturer: Panasonic Semiconductor

AN7195K
12
[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)
6) If one IC is used as a combination of L or R of the front and the rear, the cross-talk between the L and R
7) Arrangement of IC
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.
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.
and 1/2 time respectively, the time constant value becomes as same as the value when one IC is used.
operation.
In order to avoid such a phenomenon, connect the ICs with each other through a resistor (47 k ).
operation.
circuit after connecting a capacitor (33 F) to each IC.
increases. The circuit shown by figure 8 becomes thermally advantageous when there is a difference in the
output between the front and rear.
Ch.1 Out ( )
Ch.1 Out ( )
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.
Even if the standby terminals are connected with each other, that does not result in an abnormal operation.
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
Even if the the beep sound input terminals are short-circuited each other, that does not result in an abnormal
However, if there is a temperature difference between ICs, there may be a fluctuation of the output offset.
Even if the ripple filter terminals are short-circuited each other, that does not result in an abnormal
However, if the standby of each IC is individually controlled, the short-circuiting is not allowed. Use the
The larger the distance between the two ICs is, the more advantageous the heat radiation design becomes.
Ch.1 GND
3
4
2
ICs for Audio Common Use
14
13
15
Ch.2 GND
Ch.2 Out ( )
Ch.2 Out ( )