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參數(shù)資料
| 型號： | TDA7381 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 18 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封裝： | FLEXIWATT-25 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 225K |
| 代理商： | TDA7381 |
Application hints
TDA7381
8/13
3.4
Diagnostics facility
The TDA7381 is equipped with a diagnostics circuitry able to detect the following events:
●
Clipping in the output stage
●
Overheating (thermal shut-down proximity)
●
Output misconnections (OUT-GND and OUT-Vs shorts)
Diagnostics information is available across an open collector output located at pin 25 (fig. 8)
through a current sinking whenever at least one of the above events is recognized.
Among them, the Clipping detector acts in a way to output a signal as soon as one or more
power transistors start being saturated.
As a result, the clipping-related signal at pin 25 takes the form of pulses, which are perfectly
syncronized with each single clipping event in the music program and reflect the same
duration time (Figure 8).
Applications making use of this facility usually operate a filtering/integration of the pulses
train through passive R-C networks and realize a volume (or tone bass) stepping down in
association with microprocessor-driven audioprocessors.
The maximum load that pin 25 can sustain is 1 k
Ω. Due to its operating principles, the
clipping detector has to be viewed mainly as a power-dependent feature rather than
frequency-dependent. This means that clipping state will be immediately signaled out
whenever a fixed power level is reached, regardless of the audio frequency.
Figure 6.
Input/output biasing.
Figure 7.
Diagnostics circuit
+
-
0.1
μF
C1 ÷ C4
+
-
8K
Ω
8K
Ω
400
Ω
400
Ω
100K
Ω
100K
Ω
70K
Ω
IN
D95AU302
TOWARDS
OTHER CHANNELS
10K
Ω
10K
Ω
VS
47
μF
C6
0.1
μF
C5
SVR
AC_GND
VREF
R
Vpin 25
25
D95AU303
TDA7385
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| TDA7383 | 22 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
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| TDA7385 | 35 W, 4 CHANNEL, AUDIO AMPLIFIER, PZIP25 |
| TDA7388A | 27 W, 4 CHANNEL, AUDIO AMPLIFIER, ZFM27 |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7381_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4 x 25W quad bridge car radio amplifier |
| TDA7382 | 功能描述:音頻放大器 4X22W Quad Brdg Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA7382音頻功率放大器 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| TDA7383 | 功能描述:音頻放大器 4X30W Quad Brdg Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA7384 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:4 x 35W QUAD BRIDGE CAR RADIO AMPLIFIER |
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