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參數(shù)資料
| 型號(hào)： | AN7198Z |
| 廠商： | PANASONIC CORP |
| 元件分類(lèi)： | 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(yè)數(shù)： | 19/20頁(yè) |
| 文件大?。?/td> | 148K |
| 代理商： | AN7198Z |
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ICs for Audio Common Use
AN7198Z
19
I
Technical Information (continued)
4. Countermeasure for shock noise of the AN7198Z (continued)
2) Standby pin to off (pin 5 V
STB
=
5 V
→
0 V) (Operating state
→
Standby state)
(1) Ripple filter pin (pin 12) becomes off gradually (Discharge down to 0 V) when V
STB
=
5 V
→
0 V.
Current source and reference voltage are on until V
RF
<
2 V
BE
.
(2) Output D range suppression circuit operates when the ripple filter pin voltage is less than 6.8 V.
The circuit limits to 0 V
<
V
OUT
<
V
RF
3 V
BE
.
DC voltage change of input circuit causes steep DC voltage change of output pin and that generates shock
noise same as at standby pin is on.
This steep DC voltage change can be suppressed by the above mentioned circuit.
Voltage of the mute pin (pin 7) makes high forcedly in the inside circuit.
(3) Input mute is on when ripple filter pin voltage V
RF
is less than 6.8 V. This prevents the shock noise which is
inputted from the pre-stage of power amp.
Also, mute is on in order to prevent the abnormal sound which is generated by clipping of waveform. (The
purpose is same as the countermeasure of start up period.)
(4) DC voltage of output pin changes with 1/2 voltage of the ripple filter pin.
Steep changes of output pin voltage is suppressed by start up gradually of the ripple filter pin.
(5) Output waveform of each plus and minus output at power supply on changes as same by symmetric placement
of inverting and non-inverting amplifier which consist of BTL amp.
Image figure of output waveform, RF-pin waveform has exponential characteristics in actually.
3) Muting on/off (Pin7 low: Muting state, high: Operating state)
(1) AC mute circuit which mute the AC component only by the simple attenuator circuit is adopted.
Conventional system generates shock noise due to change steeply of output DC voltage by cutting of input
DC voltage and muting of AC component.
V
STB
-off
3 V
BE
Clamp-off
Mute-on
Reference voltage
Constant current source
0
2
4
6
8
10
12
Mute-on
t
V
OUT
V
without D-range
suppression circuit
Output D-range
off
RF
2
4
7
6
15 k
600
Att.
0 dB
15 k
600
22 k
V
REF
=
1
CC
30 k
10 k
2
1.0
μ
F
Mute
5 V
0 V
I
O
Figure 12
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