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参数资料
型号： TDA7350
厂商： STMICROELECTRONICS
元件分类： 音频／视频放大
英文描述： 22 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM11
封装： MULTIWATT-11
文件页数： 9/22页
文件大小： 6631K
代理商： TDA7350
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
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, depending also 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 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 40, 41 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 su-
perior, in particular the st-by pin can go low faster.
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,ra-
dios etc. and transmitted by the power amplifier to
the loudspeaker.
A simple approach to solving these problems is to
use the mute characteristics of the TDA7350.
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 42 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 this circuitry from the pop point of view.
A timing diagram of this circuit is illustrated in fig
43. 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 44.
Figure 40
Figure 41
TDA7350
17/22
相关PDF资料
PDF描述
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
TDA7375AV 43 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM15
相关代理商/技术参数
参数描述
TDA7350A 功能描述:音频放大器 10W Stereo 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
TDA7350A_05 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:22W BRIDGE-STEREO AMPLIFIER FOR CAR RADIO
TDA7360 功能描述:音频放大器 22W Stereo 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
TDA7360HS 功能描述:音频放大器 18V Op 28V DC 36W 50V Supply 5A Output 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
TDA7361 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LOW VOLTAGE NBFM IF SYSTEM
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