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參數(shù)資料
| 型號： | TDA7350A |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 11 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM11 |
| 文件頁數(shù)： | 9/23頁 |
| 文件大?。?/td> | 494K |
| 代理商： | TDA7350A |
17/23
TDA7350A
If the voltage present across the load becomes rapidly zero (due to the fast switch off) a small pop occurs,
depending also on Cout,Rload.
The parameters that set the switch off time constant of the st-by pin are:
■
the st-by capacitor (Cst-by)
■
the SVR capacitor (Csvr)
■
resistors connected from st-by pin to ground (Rext)
The time constant is given by :
T
≈ Csvr 2000 // Rext + Cst-by 2500 // Rext
The suggested time constants are :
T > 120ms with Cout =1000
F, RL = 4ohm,stereo
T > 170ms with Cout = 2200
F, RL = 4ohm,stereo
If Rext is too low the Csvr can become too high and a different approach may be useful (see next section).
Figg 43, 44 show some types of electronic switches (
P compatible) suitable for supplying the st-by pin (it
is important that Qsw is able to saturate with VCE
≤ 150mV).
Also for turn off pop the bridge configuration is superior, in particular the st-by pin can go low faster.
5.4 Global Approach to Solving Pop Problem by Using the Muting/Turn On Delay Function
In the real case turn-on and turn-off pop problems are generated not only by the power amplifier, but also
(very often) by preamplifiers,tone controls, radios etc. and transmitted by the power amplifier to the loud-
speaker.
A simple approach to solving these problems is to use the mute characteristics of the TDA7350A. If the
SVR pin is at a voltage below 1.5 V, the mute attenuation (typ)is 30dB .The amplifier is in play mode when
Vsvr overcomes 3.5 V.
With the circuit of fig 45 we can mute the amplifier for a time Ton after switch-on and for a time Toff after
switch-off. During this period the circuitry that precedes the power amplifier can produce spurious spikes
that are not transmitted to the loudspeaker.
This can give back a very simple design of this circuitry from the pop point of view. A timing diagram of
this circuit is illustrated in fig 46.
Other advantages of this circuit are:
– A reduced time constant allowance of stand-by pin turn off. Consequently it is possible to drive all the
car-radio with the signal that drives this pin.
– A better turn-off noise with signal on the output. To drive two stereo amplifiers with this circuit it is
possible to use the circuit of fig 47.
Figure 43.
相關PDF資料 |
PDF描述 |
|---|---|
| TDA7350 | 22 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM11 |
| TDA7370BV | 6.5 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| TDA7370B | 6.5 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| TDA7370 | 6.5 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| TDA7375AH | 43 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7350A_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:22W BRIDGE-STEREO AMPLIFIER FOR CAR RADIO |
| TDA7360 | 功能描述:音頻放大器 22W Stereo Amplifier RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA7360HS | 功能描述:音頻放大器 18V Op 28V DC 36W 50V Supply 5A Output RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA7361 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW VOLTAGE NBFM IF SYSTEM |
| TDA7365 | 功能描述:音頻放大器 2X7W Radio Amplifier RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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