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參數(shù)資料
| 型號： | TDA7370 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 音頻放大器 |
| 英文描述： | QUAD POWER AMPLIFIER FOR CAR RADIO |
| 中文描述： | 四功率放大器汽車收音機(jī) |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 259K |
| 代理商： | TDA7370 |
OffsetControl
The quiescent output voltage must be as close as
possible to its nominal value, so that less undis-
tortedpower would be available.
For this reason an input bias current compensa-
tion is implemented to reduce the voltage drop
across the input resistors, which appears ampli-
fied at the outputs.
Gain Internally Fixed to 20dB in Single Ended,
26dB in Bridge
Advantagesof thisdesign choiceare in terms of:
componentsand spacesaving
output noise, supply voltage rejection and dis-
tortionoptimization.
Silent Turn On/Off and Muting/Stand-by Func-
tion
The stand-bycan be easily activated by means of
a CMOS level applied to pin 7 througha RC filter.
Under stand-by condition the device is turned off
completely(supply current= 1
μ
A TYP ; output at-
tenuation=90 dB TYP).
Every ON/OFF operation is virtually pop free.
Furthermore,at turn-onthe devicestaysin muting
condition for a time determined by the value as-
signed to the SVR capacitor (T= Csvr
*
7,000).
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 unpleasantacoustic effect to the speakers.
Anothersituation under which the device is totally
muted is whenever the supply voltage drops
lower than 7V. This is helpful to pop suppression
duringthe turn-offby battery switch.
EasySingle Endedto 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.
High Application Flexibility
The availability of 4 independentchannels makes
it possible to accomplishseveral 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 reversed respect to those
driven by non invertingchannels.
This is to avoid phase inconveniences causing
sound alterations especially during the reproduc-
tion of low frequencies.
BUILT-INPROTECTION SYSTEMS
Full Protection of Device and Loudspeakers
Against AC/DC Short Circuits (to Gnd, to Vs,
across the Speakers)
.
Reliable and safe operation in presence of all
kinds of short circuit involving the outputs is as-
sured by a built-in protectionsystem that operates
in the following way:
In case of overload, a SCR is activated as soon
as the current flowing through the output transis-
tors overcomes a preset threshold value depend-
ing on the chip temperature. The SCR causes an
interruption of the supply current of the power
transistor. The normal working is restored by a re-
start circuit going into action as soon as the short
circuit is removed.
Load Dump Voltage Surge
The TDA 7370 has a circuit which enables it to
withstand a voltage pulse train on pins 3 and 13,
of the type shown in fig. 22.
If the supply voltage peaks to more than 50V,
then an LC filter must be inserted between the
supply and pins 3 and 13, in order to assure that
the pulses at pins 3 and 13 will be held within the
limits shown.
A suggestedLC network is shown in fig. 21.
With this network, a trainof pulses with amplitude
up to 120V and width of 2ms can be applied at
point A. This type of protection is ON when the
supply voltage (pulse or DC) exceeds 18V. For
this reason the maximum operating supply volt-
age is 18V.
Figure 21
Figure 22
TDA7370
11/17
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7372A | Power Amplifier for Car Radio(用于汽車收音機(jī)的4×6W功率放大器) |
| TDA7372B | 4 x 6W Power Amplifier for Car Radio(4×6W用于汽車收音機(jī)的功率放大器) |
| TDA7374B | Dual Bridge Audio Amplifier for Car Radio(用于車載電臺的雙通道橋式音頻放大器) |
| TDA7374 | DUAL BRIDGE AUDIO AMPLIFIER FOR CAR RADIO |
| TDA7374BV | DUAL BRIDGE AUDIO AMPLIFIER FOR CAR RADIO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7370B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7370BV | 功能描述:音頻放大器 18V Op 28V DC 36W 50V Supply 4.5A Out 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 |
| TDA7370V | 制造商:STMicroelectronics 功能描述:QUAD 6.5W AMP. - Rail/Tube |
| TDA7372A | 功能描述:音頻放大器 4X6W Power 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 |
| TDA7372B | 功能描述:音頻放大器 4X6W Power 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 |
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