an7195k Panasonic Corporation of North America, an7195k Datasheet - Page 8

• Manufacturer Part Number: an7195k
• Description: Dual 15 W Btl Power Ic For Car Audio
• Manufacturer: Panasonic Corporation of North America

AN7195K
I Technical Information (continued)
8
[2] Application note (continued)
2. Oscillation countermeasures
3. Input terminal
4. Ripple filter
1) In order to increase the oscillation allowance, connect a capacitor and
2) The use of polyester film capacitor having a little fluctuation with
1) The reference voltage of input terminal is 0 V. When the input signal has a reference voltage other than 0 V
2) 10 kΩ or less of signal source impedance R
3) The output offset voltage fluctuates when the signal source impedance R
4) If a high frequency signal from tuners enters the input terminal as noise, insert a capacitor of approx. 0.01 µF
1) In order to suppress the fluctuation of supply voltage, connect a capacitor of approx. 33 µF between RF
2) Relation between RR (Ripple Rejection Ratio) and a capacitor
3) Relation between the rise time of circuit and a capacitor
4) The DC voltage of output terminal is approximately the middle point of the ripple filter terminal voltage.
5) The internal circuit of ripple filter terminal is as shown in figure 4 and the charge current is approx. 3 mA to
6) The muting circuit turns on when the ripple filter terminal is V
a resistor in series between each output terminal and GND as shown
in figure 2.
temperature and frequency is recommended as the 0.1 µF capacitor
for oscillation prevention.
potential, connect a coupling capacitor (of about several µF) for DC component cut in series with the input
terminal. Check the low-pass frequency characteristics to determine the capacitor value.
when using the circuit by directly connecting the volume to the input terminal. In such a case, the use of
coupling capacitor is recommended.
between the input terminal and input GND.
When a high frequency signal is inputted, malfunction in protective circuits may occur.
terminal (pin12) and GND.
The larger the capacitance of the ripple filter is, the better the ripple rejection becomes.
The larger the capacitance of the ripple filter is, the longer the time from the power on (standby high) to the
sound release becomes.
10 mA.
For that reason, abnormal sound due to waveform distortion at rising and falling of the circuit is not released.
Input signal
0.01 µF
1 µF
4.7 kΩ
11
6
200 Ω
30 kΩ
SDC00021BEB
g
can reduce the output end noise voltage.
400 Ω
Figure 3
15 µA
15 µA
CC
− 4 V
BE
g
Attenuator
or less.
is changed. A care must be taken
13,15
3,14
2,4
Figure 2
1
To power
2.2 Ω
To speaker
0.1 µF