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參數(shù)資料
| 型號(hào)： | TDA7374B |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Dual Bridge Audio Amplifier for Car Radio(用于車載電臺(tái)的雙通道橋式音頻放大器) |
| 中文描述： | 雙橋音頻放大器汽車收音機(jī)（用于車載電臺(tái)的雙通道橋式音頻放大器） |
| 文件頁(yè)數(shù)： | 8/13頁(yè) |
| 文件大?。?/td> | 170K |
| 代理商： | TDA7374B |
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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 riduce the voltage drop
across the input resistors, which appears ampli-
fied at the outputs.
Gain Internally Fixed to 26dB
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.
BUILT-IN PROTECTION SYSTEMS
Full Protection of Device and Loudspeakers
Against AC/DC Short Circuits (to Gnd, to Vs,
acrossthe Speakers)
.
Reliable and safe operation in presence of all
kinds of short circuit involving the outputs is as-
sured by a built-inprotectionsystem that operates
in the followingway:
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.
Load Dump Voltage Surge
The TDA 7374 has a circuit which enables it to
withstand a voltage pulse train on pins 3 and 13,
of the type shown in fig. 16.
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. 15.
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.
Polarity Inversion
Figure 16
High current (up to 10A) can be handled by the
device with no damage for a longer period than
the blow-out time of a quick 2A fuse (normally
connected in series with the supply). This fea-
tures is added to avoid destruction,if during fitting
to the car, a mistake on the connection of the
supplyis made.
OpenGround
When the radio is in the ON condition and the
ground is accidentally opened, a standard audio
amplifierwill be damaged.On the TDA7374Bpro-
tection diodes are includedto avoid any damage.
Inductive Load
A protection diode is provided to allow use of the
TDA7374Bwith inductiveloads.
Figure 15
TDA7374B
8/13
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7374 | DUAL BRIDGE AUDIO AMPLIFIER FOR CAR RADIO |
| TDA7374BV | DUAL BRIDGE AUDIO AMPLIFIER FOR CAR RADIO |
| TDA7375AH | 2 x 37W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7375AV | 2 x 37W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7375H | 2 x 35W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7374BV | 功能描述:音頻放大器 Quad 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 |
| TDA7374V | 制造商:STMicroelectronics 功能描述:DUAL 21W BRIDGE AMP - Rail/Tube |
| TDA7375 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 35W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7375A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 37W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7375A_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 X 37W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO |
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