an7199z Panasonic Corporation of North America, an7199z Datasheet - Page 12

• Manufacturer Part Number: an7199z
• Description: Dual 20 W Btl Power Ic For Car Audio
• Manufacturer: Panasonic Corporation of North America

AN7199Z
12
[2] Application note (continued)
2. Oscillation countermeasures
3. Input terminal
Technical Information (continued)
1) In order to increase the oscillation allowance, it is unnecessary to use a
2) The use of polyester film capacitor having a little fluctuation with tem-
1) The reference voltage of input terminal is 0 V. When the input signal has a reference voltage other than 0 V
2) 10 k 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 F
4. Ripple filter
1) In order to suppress the fluctuation of supply voltage, connect
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
5) The internal circuit of ripple filter terminal is as shown in fig-
Input signal
capacitor and a resistor between each output terminal and GND. How-
ever, when inserting the capacitor for counter-measures against output
line noise between the output terminal and GND, insert a resistor of
approx. 2.2
if only capacitor is used. Use it after giving a sufficient evaluation
perature and frequency is recommended as the capacitor for counter-
measures against output line noise.
potential, connect a coupling capacitor (of about several F) 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.
a capacitor of approx. 33 F between RF 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.
point of the ripple filter terminal voltage.
ure 5 and the charge current is approx. 3 mA to 10 mA.
0.01 F
1 F
in series as shown in figure 2. The oscillation may occur
10 k
11
6
200
30 k
g
can reduce the output end noise voltage.
600
15 A
Figure 3
15 A
ICs for Audio Common Use
1 000
100
10
Attenuator
g
is changed. A care must be taken
1.0
RF capacitor value ( F)
13,15
3,14
2,4
To power
1
Figure 4
2.2
Figure 2
10
To speaker
0.01 F to 0.1 F
100
60
50
40