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參數(shù)資料
| 型號(hào)： | TDA7381 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 4 x 25W Quad Bridge Car Radio Amplifier(音頻功率放大器) |
| 中文描述： | 4 × 25瓦四橋汽車收音機(jī)放大器（音頻功率放大器） |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 292K |
| 代理商： | TDA7381 |
tor has to be viewed mainly as a power-depend-
ent featurerather than frequency-dependent.This
means that clipping state will be immediately sig-
naled out whenever a fixed power level is
reached,regardless of theaudio frequency.
In other words, this feature offers the means to
counteract the extremely sound-damaging effects
of clipping, caused by a sudden increase of odd
order harmonics and appearanceof serious inter-
modulationphenomena.
Another possible kind of distortion control could
be the setting of a maximum allowable THD limit
(e.g. 0.5 %) over the entire audio frequency
range. Besides offering no practical advantages,
this procedure cannot be much accurate, as the
non-clipping distortion is likely to vary over fre-
quency.
In case of
OVERHEATING
, pin 25 will signal out
the junction temperature proximity to the thermal
shut-down threshold. This will typically start about
2
o
C before the thermal shut-down threshold is
reached.
As various kind of diagnosticsinformation is avail-
able at pin 25 (CLIPPING, SHORTS AND OVER-
HEATING), it may be necessary to operate some
distinctions on order to treat each event sepa-
rately. This could be achieved by taking into ac-
count the intrinsically different timing of the diag-
nostics outputunder each circumstance.
In fact, clipping will produce pulses normally
much shorter than those present under faulty con-
ditions. An example of circuit able to distinguish
between the two occurrencesis shown by fig.7.
STABILITYAND LAYOUTCONSIDERATIONS
If properly layouted and hooked to standard car-
radio speakers, the TDA7381 will be intrinsically
stable with no need of external compensations
such as output R-C cells. Dueto the high number
of channels involved, this translates into a very
remarkable components saving if compared to
similardevices on the market.
To simplify pc-board layout designs, each ampli-
fier stage has its own power ground externally ac-
cessible (pins 2,8,18,24) and one supply voltage
pin for eachcouple of them.
Even more important, this makes it possible to
achieve the highest possible degree of separation
among the channels, with remarkable benefitsin
terms of cross-talkand distortionfeatures.
About the layout grounding, it is particularly im-
portant to connect the AC-GND capacitor (C
5
) to
the signal GND, as close as possibleto the audio
inputs ground: this will guaranteehigh rejectionof
any commonmode spurioussignals.
The SVR capacitor (C
6
) has also to be connected
to the signal GND.
Supply filtering elements (C
7
, C
8
) have naturally
to be connected to the power-ground and located
as close as possibleto the Vs pins.
Pin 1, which is mechanically attached to the de-
vice’s tab, needs to be tied to the cleanest power
ground point in the pc-board, which is generally
near the supply filtering capacitors.
CLIP DET. (TO
GAIN
COMPRESSOR/
TONE CONTROL)
T1
25
D95AU305
TDA7381
+
-
VREF
VREF1
T2
FAULT, THERMAL
SHUTDOWN
(TO POWER SUPPLY
SECTION,
μ
P
VOLTAGE
REGULATOR, FLASHING SYSTEM)
+
-
VREF2
T1 <<
T2
VREF
≥
VREF1 >> VREF2
Figure 7.
TDA7381
8/10
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相關(guān)代理商/技術(shù)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(fēng)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(fēng)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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