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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)： | 14/20頁 |
| 文件大小： | 148K |
| 代理商： | AN7198Z |
AN7198Z
ICs for Audio Common Use
14
I
Technical Information (continued)
3. Application note (continued)
6) Cooling fin
(1) The cooling fin is not connected with GND terminal by using Au wire. Only pin 8 is electrically connected
through the substrate.
(2) Always attach an outside heat sink to the cooling fin. The cooling fin must be fastened onto a chassis for use.
Otherwise, IC lead failure may occur.
(3) Do not give the cooling fin any potential other than the GND potential. Otherwise, it may cause breakdown.
(4) Connection of the cooling fin with GND can reduce the incoming noise hum. (It is unnecessary to connect
with GND in use, but connect it with the power GND when the cooling fin is connected with GND)
7) Shock noise
(1) STB on/off
Turn on the mute circuit when switching over to the standby.
No shock noise is released when the mute on state. However, the changeover switch of the standby terminal
may make a slight shock noise. In such a case, insert a capacitor of approx. 0.01
μ
F between the standby
terminal and GND.
(2) Mute on/off
No shock noise is released. Refer to the section on the mute function.
8) Mute function
(1) The mute-On/Off is possible by making pin 7 (the muting terminal) high or to low.
(2) The muting circuit is as shown in Figure 7. The amplifier gain including attenuator block is given in the
following equation:
I
1
×
50
I
2
Original gain
From the above equation, the amplifier gain can be made as 0 time by setting I
1
at 0 mA at muting.
(3) The threshold voltage of V
MUTE
is as follows:
Mute-off
approx. 1 V or less
Mute-on
approx. 3 V or more
G
V
=
200
7
22 k
5 V
0 V
1
μ
F
I
2
I
1
I
2
I
1
I
1
=
approx. 120
μ
A
I
2
=
approx. 120
μ
A
Output stage
Input
Output stage
Attenuator block
V
MUTE
Mute/off
Mute/on
Figure 7
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