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參數(shù)資料
| 型號： | TDA7294S |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 音頻放大器 |
| 英文描述： | 100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| 中文描述： | 100V的- 100瓦的DMOS音頻放大器靜音/意法半導(dǎo)體，由 |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 339K |
| 代理商： | TDA7294S |
INTRODUCTION
In consumer electronics, an increasing demand
has arisen for very high power monolithic audio
amplifiers able to match, with a low cost, the per-
formance obtained from the best discrete de-
signs.
The task of realizing this linear integrated circuit
in conventional bipolar technology is made ex-
tremely difficult by the occurence of 2nd break-
down phoenomenon. It limits the safe operating
area (SOA) of the power devices, and, as a con-
sequence, the maximum attainable output power,
especiallyin presenceof highly reactive loads.
Moreover, full exploitation of the SOA translates
into a substantial increase in circuit and layout
complexity due to the need of sophisticated pro-
tectioncircuits.
To overcome these substantial drawbacks, the
use of power MOS devices, which are immune
from secondarybreakdownis highlydesirable.
The device described has therefore been devel-
oped in a mixed bipolar-MOS high voltage tech-
nologycalled BCDII 100.
1) Output Stage
The main design task in developpinga power op-
erational amplifier, independently of the technol-
ogy used, is that of realizationof theoutput stage.
The solution shown as a principle shematic by
Fig3 represents the DMOS
bufferof the TDA7294S.
This large-signal, high-power buffer must be ca-
pable of handlingextremely high current and volt-
age levels while maintaining acceptably low har-
monic
distortion
and
unity - gain output
good
behaviour
over
frequency response; moreover, an accurate con-
trol of quiescentcurrent is required.
A local linearizing feedback, provided by differen-
tial amplifier A, is used to fullfil the above require-
ments, allowing a simple and effective quiescent
current setting.
Proper biasing of the power output transistors
alone is howevernot enoughto guaranteethe ab-
sence of crossover distortion.
While a linearization of the DC transfer charac-
teristic of the stage is obtained, the dynamic be-
haviour of the system must be taken into account.
A significant aid in keeping the distortion contrib-
uted by the final stage as low as possible is pro-
vided by the compensation scheme, which ex-
ploits the direct connection of the Miller capacitor
at the amplifier’s output to introduce a local AC
feedbackpath enclosingthe output stage itself.
2) Protections
In designing a power IC, particular attention must
be reserved to the circuits devoted to protection
of the device from short circuit or overload condi-
tions.
Due to the absence of the 2nd breakdown phe-
nomenon, the SOA of the power DMOS transis-
tors is delimited only by a maximum dissipation
curve dependent on the duration of the applied
stimulus.
In order to fully exploit the capabilities of the
power transistors, the protection scheme imple-
mented in this device combines a conventional
SOA protectioncircuit with a novel local tempera-
ture sensing technique which ” dynamically” con-
trols the maximum dissipation.
Figure3:
PrincipleSchematicof a DMOSunity-gain buffer.
TDA7294S
6/13
相關(guān)PDF資料 |
PDF描述 |
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| TDA7294SV | 100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7294V | 100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7294 | 100V - 100W DMOS Audio Amplifier With Mute/ST-BY(帶消音和預(yù)備狀態(tài)的音頻放大器) |
| TDA7295 | 80V - 80W DMOS Audio Amplifier with Mute/ST-BY(帶消音和備用的80V-80W DMOS音頻放大器) |
| TDA7296S | 60V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7294S_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7294SV | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7294V | 功能描述:音頻放大器 100W Audio 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 |
| TDA7294V | 制造商:STMicroelectronics 功能描述:Audio Power Amplifier IC |
| TDA7295 | 功能描述:音頻放大器 80W Audio 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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