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參數(shù)資料
| 型號(hào)： | TDA7256 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 30W Bridge Amplifier for Car Radio(用于汽車收音機(jī)的30W橋式放大器) |
| 中文描述： | 功率30W橋放大器（用于汽車收音機(jī)的功率30W橋式放大器的汽車收音機(jī)） |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 116K |
| 代理商： | TDA7256 |
CIRCUIT DESCRIPTION
INPUT STAGE
The input stage is a differential type preamplifier
stage with two independent inputs and two out-
puts in phase opposition.
It is designed for particularlinearity characteristics
in order to have output amplitude large enough
(1VPP)yet maintaining low distortion.
The voltage gain of the stage is 6 dB.The possi-
bility to use the differential input allows the sys-
tem immunity to common-mode noise in case of
long wireconnections(fig. 17 )
MUTE
The mute circuit (TTL compatible) acts at pream-
plifier level and disablesthe inputs without chang-
ing the DC voltage values. In such a way the op-
eration is fully popless.The use of a RC network
produces a soft reduction of the audio signal pro-
viding the best effect from the acoustic point of
view (fig 18).
The mute circuit is also activated during turn-
on/turn-off operations when the voltage at stand-
by pin is lowerthan about 2 volt
TURN-ON
The TDA7256 is fully poplessat turn-onthanks to
a delay circuit which keeps the output low during
the capacitorscharge transient.
The delay-timeis given by the following formula:
TURN-OFF
The ground compatible structures and the choice
of a soft turn-off circuit ensure a fully popless op-
eration.
OUTPUT STAGE
It is a power stage designed in a way of being
able to drive loads up to 2 ohm in bridge configu-
ration without bootstrap capacitors (22 W with
R
L
=4 ohm, 30W with R
L
=2 ohm).
SVR
The noises coming from the car environment are
essentially inside the bandwith from 300 Hz to 6
KHz.
The ripple rejection circuit which utilizes also the
gain capacitors C11,C9 ensures in this frequency
range a rejection typ. of 60dB.
SHORT CIRCUIT PROTECTION
The short circuit protection circuits intervene in
the followingcases:
- s.c. between one output and ground
- s.c. between one output and +Vs
- s.c. between the outputs
In the first two cases they stop the current in both
the final stages,allowing also loudspeaker protec-
tion.In the last case the current is limited, thus
avoiding the load point to reach the SOA of the
output transistors.
STAND-BY
In stand-by condition the current generators are
disabled:the current drops to a very low value
(few
μ
A). Also thisfunctionis fullypopless.
Fig. 19 shows the silent transientsof turn-on and
turn-off operations through both the mute and the
stand-bypins.
Figure 18:
SoftMuting
T
o
= 800 C10 + 600 (C9 + C11)
(
C10
C9
+
C11
+
1
)
Figure 17:
Balanced-UnbalancedInput
TDA7256
7/10
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA7261 | 25W MONO Amplifier with Mute/ST-BY(帶消音和備用的25W單聲道放大器) |
| TDA7262 | 20+20W Stereo Amplifier with Stand-BY(帶備用的20+20W立體聲放大器) |
| TDA7263M | 12 +12W Stereo Amplifier with Muting(帶消音的12+12W立體聲放大器) |
| TDA7263 | 12 +12W Stereo Amplifier with Muting(帶消音的立體聲放大器) |
| TDA7264A | 25+25W STEREO AMPLIFIER WITH MUTE/ST-BY |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7261 | 功能描述:音頻放大器 25W Mono 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 |
| TDA7262 | 功能描述:音頻放大器 20W 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 |
| TDA7263 | 功能描述:音頻放大器 12W 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 |
| TDA7263L | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6 + 6W STEREO AMPLIFIER WITH MUTING |
| TDA7263M | 功能描述:音頻放大器 12W 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 |
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