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參數(shù)資料
| 型號： | AN7198Z |
| 廠商： | PANASONIC CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Dual 20 W BTL Power IC for Car Audio |
| 中文描述： | 28 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| 封裝： | ZFM-15 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 148K |
| 代理商： | AN7198Z |
AN7198Z
ICs for Audio Common Use
12
10 k
30 k
200
6
11
600
15
μ
A
0.01
μ
F
1
μ
F
15
μ
A
Attenuator
to power
Input signal
I
Technical Information (continued)
3. Application note (continued)
2) Output line noise countermeasures
(1) In order to increase the oscillation allowance, it is unnecessary
to use a capacitor and a resistor between each output terminal
and GND. However, when inserting the capacitor for counter-
measures against output line noise between the output terminal
and GND, insert a resistor of approx. 2.2
in series as shown
in Figure 2. The oscillation may occur if only capacitor is used.
Use it after giving a sufficient evaluation.
(2) The use of polyester film capacitor having a little fluctuation
with temperature and frequency is recommended as the
capacitor for countermeasures against output line noise.
3) Input terminal
(1) The reference voltage of input terminal is 0 V. When the input
signal has a reference voltage other than 0 V potential, connect
a coupling capacitor (of about several
μ
F) for DC component
cut in series with the input terminal. Check the low-pass
frequency characteristics to determine the capacitor value.
(2) 10 k
or less of signal source impedance R
g
can reduce the output end noise voltage.
(3) The output offset voltage fluctuates when the signal source impedance R
g
is changed. A care must be taken
in the case of using the circuit by directly connecting a volume control to the input terminal. In such a case,
the use of coupling capacitor is recommended.
(4) If a high frequency signal from tuners enters the input terminal as noise, insert a capacitor of approx. 0.01
μ
F
between the input terminal and input GND.
When a high frequency signal is inputted, malfunction in protective circuits may occur.
Figure 2
Figure 3
4) Ripple filter
(1) In order to suppress the fluctuation of supply voltage, connect a capacitor of approx. 33
μ
F between RF
terminal (pin 12) and GND.
(2) Relation between RR (Ripple Rejection Ratio) and a capacitor.
The larger the capacitance of the ripple filter is, the better the ripple rejection ratio becomes.
(However, there is almost no difference if the capacitance is 10
μ
F or more.)
2.2
0.01
μ
F
to 0.1
μ
F
2, 4
1
13, 15
3, 14
to speaker
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