參數(shù)資料
型號(hào)： TDA7293V
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 100 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15
封裝： MULTIWATT-15
文件頁(yè)數(shù)： 19/21頁(yè)
文件大?。?/td> 397K
代理商： TDA7293V
TDA7293
Circuit description
Doc ID 6744 Rev 8
7/21
3
Circuit description
In consumer electronics, an increasing demand has arisen for very high power monolithic
audio amplifiers able to match, with a low cost, the performance obtained from the best
discrete designs.
The task of realizing this linear integrated circuit in conventional bipolar technology is made
extremely difficult by the occurence of 2nd breakdown phoenomenon. It limits the safe
operating area (SOA) of the power devices, and, as a consequence, the maximum
attainable output 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 of sophisticated protection circuits.
To overcome these substantial drawbacks, the use of power MOS devices, which are
immune from secondary breakdown is highly desirable.
The device described has therefore been developed in a mixed bipolar-MOS high voltage
technology called BCDII 100/120.
3.1
Output Stage
The main design task in developping a power operational amplifier, independently of the
technology used, is that of realization of the output stage.
The solution shown as a principle shematic by Fig6 represents the DMOS unity - gain output
buffer of the TDA7293.
Figure 4.
Schematic of a DMOS unity-gain buffer
This large-signal, high-power buffer must be capable of handling extremely high current and
voltage levels while maintaining acceptably low harmonic distortion and good behaviour
over frequency response; moreover, an accurate control of quiescent current is required.
A local linearizing feedback, provided by differential amplifier A, is used to fullfil the above
requirements, allowing a simple and effective quiescent current setting. Proper biasing of
the power output transistors alone is however not enough to guarantee the absence of
crossover distortion.
相關(guān)PDF資料
PDF描述
TDA7293HS 100 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15
TDA7294V 100 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15
TDA7294HS 100 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15
TDA7295S 80 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15
TDA7295 80 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7293V 制造商:STMicroelectronics 功能描述:Audio Power Amplifier IC
TDA7294 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
TDA7294_07 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
TDA7294HS 功能描述:音頻放大器 100V, 100W DMOS AMP Up to 40V Mute STDBY 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
TDA7294-HS 制造商:STMicroelectronics 功能描述:TDA7294-HS - Bulk
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