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参数资料
| 型号： | TDA7381 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 18 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | FLEXIWATT-25 |
| 文件页数： | 11/13页 |
| 文件大小： | 225K |
| 代理商： | TDA7381 |
TDA7381
Application hints
7/13
3
Application hints
3.1
Biasing and SVR
As shown by Figure 3, all the TDA7381’s main sections, such as Inputs, Outputs and AC-
GND (pin 16) are internally biased at half supply voltage level (Vs/2), which is derived from
the supply voltage rejection (SVR) block. In this way no current flows through the internal
feedback network.
The AC-GND is common to all the 4 amplifiers and represents the connection point of all the
inverting inputs. Both individual inputs and AC-GND are connected to Vs/2 (SVR) by means
of 100 k
Ω resistors.
To ensure proper operation and high supply voltage rejection, it is of fundamental
importance to provide a good impedance matching between INPUTS and AC-GROUND
terminations.
This implies that C1, C2, C3, C4, C5 capacitors have to carry the same nominal value and
their tolerance should never exceed ±10 %.
Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF
time sequence and, consequently, plays an essential role in the pop optimization during
ON/OFF transients. To conveniently serve both needs, its minimum recommended value
is 10
μF.
3.2
Input stage
The TDA7381’S inputs are ground-compatible and can stand very high input signals
(± 8 Vpk) without any performances degradation. If the standard value for the input
capacitors (0.1
μF) is adopted, the low frequency cut-off will amount to 16 Hz.
3.3
Stand-by and muting
Stand-by and muting facilities are both CMOS-compatible. If unused, a straight connection
to Vs of their respective pins would be admissible.
Conventional low-power transistors can be employed to drive muting and stand-by pins in
absence of true CMOS ports or microprocessors. R-C cells have always to be used in order
to smooth down the transitions for preventing any audible transient noises. Since a DC
current of about 10
μA normally flows out of pin 22, the maximum allowable muting-series
resistance (R2) is 70 kΩ, which is sufficiently high to permit a muting capacitor reasonably
small (about 1
μF). If R
2 is higher than recommended, the involved risk will be that the
voltage at pin 22 may rise to above the 1.5 V threshold voltage and the device will
consequently fail to turn OFF when the mute line is brought down.
About the stand-by, the time constant to be assigned in order to obtain a virtually pop-free
transition has to be slower than 2.5 V/ms.
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| TDA7383 | 22 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
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相关代理商/技术参数 |
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| TDA7381_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:4 x 25W quad bridge car radio amplifier |
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| TDA7382音频功率放大器 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| TDA7383 | 功能描述:音频放大器 4X30W Quad Brdg 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 |
| TDA7384 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:4 x 35W QUAD BRIDGE CAR RADIO AMPLIFIER |
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