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參數(shù)資料
| 型號(hào)： | TDA7296 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| 中文描述： | 70V的- 60瓦的DMOS音頻放大器靜音/意法半導(dǎo)體，由 |
| 文件頁(yè)數(shù)： | 8/13頁(yè) |
| 文件大?。?/td> | 241K |
| 代理商： | TDA7296 |
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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 phenomenon. It limits the safe operating
area (SOA) of the power devices, and as a con-
sequence, the maximum attainableoutput power,
especially in presence of highly reactive loads.
Moreover, full exploitation of the SOA translates
into a substantial increase in circuit and layout
complexity due to the need for sophisticated pro-
tection circuits.
To overcome these substantial drawbacks, the
use of power MOS devices, which are immune
from secondarybreakdownis highly desirable.
The device described has therefore been devel-
oped in a mixed bipolar-MOS high voltage tech-
nology called BCD 80.
1) Output Stage
The main design task one is confrontedwith while
developing an integrated circuit as a power op-
erational amplifier, independently of the technol-
ogy used, is that of realising the outputstage.
The solution shown as a principle schematic by
Fig 15 represents the DMOS unity-gain output
buffer of the TDA7296.
This large-signal, high-power buffer must be ca-
pable of handling extremely high current and volt-
age levels while maintaining acceptably low har-
monic distortion and good behaviour over fre-
quency response; moreover, an accurate control
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-
senceof 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 takeninto 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 enclosing the 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 protection circuit with a novel local tempera-
ture sensing technique which ” dynamically” con-
trols the maximumdissipation.
Figure 15:
PrincipleSchematicof a DMOSunity-gain buffer.
TDA7296
8/13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA-7296 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7296_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7296A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7296AV | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7296HS | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:70V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
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