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参数资料
| 型号： | TDA7375V |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 40 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| 封装： | ROHS COMPLIANT, MULTIWATT V-15 |
| 文件页数： | 15/15页 |
| 文件大小： | 252K |
| 代理商： | TDA7375V |
9/15
TDA7375V
driven by a voltage source whose current capability is higher than 5mA. In practical cases a series resis-
tance has always to be inserted, having it the double purpose of limiting the current at pin 7 and to smooth
down the stand-by ON/OFF transitions - in combination with a capacitor - for output pop prevention.
In any case, a capacitor of at least 100nF from pin 7 to S-GND, with no resistance in between, is necessary
to ensure correct turn-on.
5.6 OUTPUT STAGE
The fully complementary output stage was made possible by the development of a new component: the
ST exclusive power ICV PNP.
A novel design based upon the connection shown in fig. 23 has then allowed the full exploitation of its pos-
sibilities. The clear advantagesthis new approach has over classical output stages are as follows:
5.6.1 Rail-to-Rail Output Voltage Swing With No Need of Bootstrap Capacitors.
The output swing is limited only by the VCEsat of the output transistors, which is in the range of 0.3
Ω (Rsat)
each. Classical solutions adopting composite PNP-NPN for the upper output stage have higher saturation
loss on the top side of the waveform.
This unbalanced saturation causes a significant power reduction. The only way to recover power consists
of the addition of expensive bootstrap capacitors.
5.6.2 Absolute Stability Without Any External Compensation.
Referring to the circuit of fig. 23 the gain VOut/VIn is greater than unity, approximately 1+R2/R1. The DC
output (VCC/2) is fixed by an auxiliary amplifier common to all the channels.
By controlling the amount of this local feedbackit is possible to force the loop gain (A*
β) to less than unity
at frequency for which the phase shift is 180°. This means that the output buffer is intrinsically stableand
not prone to oscillation.
Most remarkably, the above feature has been achieved in spite of the very low closed loop gain of the
amplifier. In contrast, with the classical PNP-NPN stage, the solution adopted for reducing the gain at high
frequencies makes use of external RC networks, namely the Boucherot cells.
5.7 BUILT–IN SHORTCIRCUIT PROTECTION
Figure 23. The New Output Stage
Reliable and safe operation, in presence of all kinds of short circuit involving the outputs is assured by
BUILT-IN protectors. Additionally to the AC/DC short circuit to GND, to VS, across the speaker, a SOFT
SHORT condition is signalled out during the TURN-ON PHASE so assuring correct operation for the de-
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7376B | 功能描述:音频放大器 2X35W Pwr 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 |
| TDA7376PD | 功能描述:音频放大器 2 x 35W Pwr AMP 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 |
| TDA7376PD_09 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:2 x 35 W power amplifier for car radio |
| TDA7376PDTR | 功能描述:音频放大器 2 x 35W Pwr AMP 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 |
| TDA7377 | 功能描述:音频 DSP 2X35W Pwr Amplifier RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
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