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参数资料
| 型号： | TDA7293HS |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 100 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| 封装： | MULTIWATT-15 |
| 文件页数： | 19/21页 |
| 文件大小： | 397K |
| 代理商： | TDA7293HS |
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.
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| TDA7296AV | 30 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7293V | 功能描述:音频放大器 100W Audio Amplifier RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDA7293V | 制造商:STMicroelectronics 功能描述:Audio Power Amplifier IC |
| TDA7294 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7294_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7294HS | 功能描述:音频放大器 100V, 100W DMOS AMP Up to 40V Mute STDBY RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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