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參數(shù)資料
| 型號： | TDA7350A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 22W Bridge-Stereo Amplifier for Car Radio(用于汽車收音機的22W橋式立體聲放大器) |
| 中文描述： | 22W大橋立體聲放大器汽車收音機（用于汽車收音機的22W橋式立體聲放大器） |
| 文件頁數(shù)： | 17/22頁 |
| 文件大?。?/td> | 323K |
| 代理商： | TDA7350A |
TURN-OFF
A turn-off pop can occur if the st-by pin goes low
with a short time constant (this can occur if other
car radio sections, preamplifiers,radio.. are sup-
plied through the same st-by switch).
This pop is due to the fast switch-off of the inter-
nal current generator of the amplifier.
If the voltage present across the load becomes
rapidly zero (due to the fast switch off) a small
pop occurs,dependingalso on Cout,Rload.
The parameters that set the switch off time con-
stantof the st-bypin are:
the st-bycapacitor(Cst-by)
the SVR capacitor (Csvr)
resistors connected from st-by pin to ground
(Rext)
The time constantis given by :
T
≈
Csvr
2000
//Rext+ Cst-by
2500
//Rext
The suggestedtime constantsare :
T > 120ms with C
out
=1000
μ
F,R
L
= 4ohm,stereo
T > 170ms with C
out
=2200
μ
F,R
L
= 4ohm,stereo
If Rext is too low the Csvr can become too high
and a different approach may be useful (see next
section).
Figg 40, 41 show some types of electronic
switches (
μ
P compatible) suitable for supplying
the st-by pin (it is important that Qsw is able to
saturate with V
CE
≤
150mV).
Also for turn off pop the bridge configurationis su-
Figure40
perior, inparticular the st-bypin can go low faster.
GLOBAL
PROBLEM BY USING THE MUTING/TURN ON
DELAY FUNCTION
In the real case turn-on and turn-offpop problems
are generated not only by the power amplifier,but
also (very often) by preamplifiers,tone controls,ra-
diosetc. and transmittedby thepower amplifier to
the loudspeaker.
A simple approach to solving these problems is to
use the mute characteristicsof the TDA7350.
If the SVR pin is at a voltage below 1.5 V, the
mute attenuation (typ)is 30dB .The amplifier is in
playmode when Vsvr overcomes3.5 V.
With the circuit of fig 42 we can mute the amplifier
for a time Ton after switch-on and for a time Toff
after switch-off.Duringthis period the circuitry that
precedes the power amplifier can produce spuri-
ous spikes that are not transmitted to the loud-
speaker.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
43. Other advantagesof this circuit are:
- A reduced time constant allowance of stand-by
pin turn off.Consequentlyit is possible to drive all
the car-radio with the signalthat drives this pin.
-A better turn-off noise with signal on the output.
To drive two stereo amplifiers with this circuit it is
possibleto usethe circuit of fig 44.
APPROACH
TO
SOLVING
POP
Figure41
TDA7350A
17/22
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7350 | 22W BRIDGE-STEREO AMPLIFIER FOR CAR RADIO |
| TDA7360HS | 22W BRIDGE / STEREO AUDIO AMPLIFIER WITH CLIPPING DETECTOR |
| TDA7360 | 22W Bridge / Stereo Audio Amplifier with Clipping Detector(22W橋式立體聲音頻放大器帶限幅檢測器) |
| TDA7361 | Low Voltage NBFM IF System(低壓NBFM IF系統(tǒng)) |
| TDA7370B | Quad Power Amplifier for Car Radio(用于汽車收音機的四功率放大器) |
相關(guān)代理商/技術(shù)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(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 |
| 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(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 |
| 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(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 |
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