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參數(shù)資料
| 型號(hào)： | TDA7360HS |
| 廠(chǎng)商： | 意法半導(dǎo)體 |
| 元件分類(lèi)： | 音頻放大器 |
| 英文描述： | 22W BRIDGE / STEREO AUDIO AMPLIFIER WITH CLIPPING DETECTOR |
| 中文描述： | 22W橋/立體聲音頻放大器，具有裁剪探測(cè)器 |
| 文件頁(yè)數(shù)： | 17/22頁(yè) |
| 文件大?。?/td> | 224K |
| 代理商： | TDA7360HS |
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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 throughthe same st-by switch).
This pop is due to the fast switch-off of the inter-
nal current generatorof 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-
stant 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 suggestedtime constantsare :
T > 120mswith C
out
=1000
μ
F,R
L
= 4ohm,stereo
T > 170mswith 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 41, 42 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 turnoff popthe bridge configurationis su-
Figure 41
perior,in particularthe st-by pin can go low faster.
GLOBAL
PROBLEM BY USING THE MUTING/TURN ON
DELAYFUNCTION
In the real case turn-on and turn-off pop problems
are generatednot only by the power amplifier,but
also (very often) by preamplifiers,tone controls,ra-
dios etc. and transmitted by the power amplifier to
the loudspeaker.
A simple approach to solving these problems is to
use the mute characteristicsof the TDA7360.
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 overcomes3.5 V.
With the circuit of fig 43 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 spuri-
ous spikes that are not transmitted to the loud-
speaker. This can give back a very simple design
of thiscircuitry from the pop point of view.
A timing diagram of this circuit is illustrated in fig
44. 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 signal that drivesthis pin.
-A better turn-offnoise with signal on the output.
To drive two stereo amplifiers with this circuit it is
possible to use the circuit of fig 45.
APPROACH
TO
SOLVING
POP
Figure 42
TDA7360
17/22
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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(cè)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(chē)收音機(jī)的四功率放大器) |
| TDA7370 | QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7372A | Power Amplifier for Car Radio(用于汽車(chē)收音機(jī)的4×6W功率放大器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7361 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):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(lèi)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 |
| TDA7370 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7370B | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:QUAD POWER AMPLIFIER FOR CAR RADIO |
| TDA7370BV | 功能描述:音頻放大器 18V Op 28V DC 36W 50V Supply 4.5A Out RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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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