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參數(shù)資料
| 型號： | TDA7375AV |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 音頻放大器 |
| 英文描述： | 2 x 37W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| 中文描述： | 2 × 37W雙/四路功率放大器汽車收音機(jī) |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 192K |
| 代理商： | TDA7375AV |
High ApplicationFlexibility
The availability of 4 independentchannels makes
it possible to accomplish several kinds of applica-
tions ranging from 4 speakers stereo (F/R) to 2
speakersbridge solutions.
In case of working in single ended conditions the
polarity of the speakers driven by the inverting
amplifier must be reversedrespect to those driven
by noninverting channels.
This is to avoid phase inconveniences causing
sound alterations especially during the reproduc-
tionof low frequencies.
Easy SingleEnded to Bridge Transition
The change from single ended to bridge configu-
rations is made simply by means of a short circuit
across the inputs, that is no need of further exter-
nal components.
Gain Internally Fixed to 20dB in Single Ended,
26dB inBridge
Advantagesof thisdesign choice are in termsof:
componentsand space saving
output noise, supply voltage rejection and dis-
tortionoptimization.
Silent Turn On/Off and Muting/Stand-by Func-
tion
The stand-by can be easily activated by means of
a CMOS level applied to pin 7 through a RC filter.
Under stand-by condition the device is turned off
completely (supply current = 1
μ
A typ.; output at-
tenuation= 80dBmin.).
Every ON/OFFoperationis virtually pop free.
Furthemore, at turn-on the device stays in muting
condition for a time determined by the value as-
signed to theSVR capacitor.
While in muting the device outputs becomes in-
sensitive to any kinds of signal that may be pre-
sent at the input terminals. In other words every
transient coming from previous stages produces
no unplesantacoustic effectto the speakers.
OUTPUT STAGE
The fully complementary output stage was made
possible by the development of a new compo-
nent: the ST exclusivepower ICV PNP.
A novel design based upon the connectionshown
in fig. 20 has then allowed the full exploitation of
its possibilities.
The clear advantagesthis new approachhas over
classicaloutput stages are as follows:
Rail-to-Rail Output Voltage Swing With No
Need of Bootstrap Capacitors.
The output swing is limited only by the VCEsat
of the outputtransistors,which arein the range
of 0.3
(R
sat
) each.
Classical solutions adopting composite PNP-
NPN for the upper output stage have higher
saturationloss on the top side of the waveform.
This unbalanced saturation causes a signifi-
cant power reduction. The only way to recover
power consists of the addition of expensive
bootstrapcapacitors.
Absolute Stability Without Any External
Compensation.
Referring to the circuit of fig. 20 the gain
V
Out
/V
In
is greater than unity, approximately1+
R2/R1. The DC output (V
CC
/2) is fixed by an
auxiliary amplifier common to allthe channels.
By controlling the amount of thislocal feedback
it is possibleto force the loop gain (A*
β
) to less
than unity at frequency for which the phase
shift is 180
°
. This means that the output buffer
is intrinsically stable and not prone to oscilla-
tion.
Most remarkably, the above feature has been
achieved in spite of the very low closed loop
gain of the amplifier.
In contrast, with the classical PNP-NPN stage,
the solution adopted for reducing the gain at
high frequencies makes use of external RC
networks,namely the Boucherotcells.
BUILT–IN SHORTCIRCUIT PROTECTION
Reliable and safe operation, in presence of all
kinds of short circuit involving the outputs is as-
sured by BUILT-IN protectors. Additionally to the
AC/DC short circuit to GND, to V
S
, across the
speaker, a SOFT SHORT condition is signalled
out during the TURN-ON PHASE so assuring cor-
Figure20:
TheNew OutputStage
TDA7375A
9/14
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7375H | 2 x 35W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7375V | 2 x 35W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7376PD | 2 X 35W POWER AMPLIFIER FOR CAR RADIO |
| TDA7377 | 2 x 30WDUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7377H | 2 x 30WDUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7375AV_12 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 37 W dual/quad power amplifier for car radio |
| TDA7375H | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 35W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7375V | 功能描述:音頻放大器 2X35W Pwr Amplifier 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 |
| TDA7376B | 功能描述:音頻放大器 2X35W Pwr Amplifier 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 |
| TDA7376PD | 功能描述:音頻放大器 2 x 35W Pwr 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 |
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