參數(shù)資料
型號(hào)： TDA7294V
廠商： 意法半導(dǎo)體
元件分類： 音頻放大器
英文描述： 100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
中文描述： 100V的- 100瓦的DMOS音頻放大器靜音/意法半導(dǎo)體，由
文件頁(yè)數(shù)： 10/16頁(yè)
文件大?。?/td> 372K
代理商： TDA7294V
TDA7294
3
1
4
13
7
8
15
2
14
6
10
R3 680
C11 22
μ
F
L3 5
μ
H
270
R16
13K
C15
22
μ
F
9
R16
13K
C13 10
μ
F
R13 20K
R14 30K
C11 330nF
R15 10K
C14
10
μ
F
D5
1N4148
PLAY
ST-BY
270
L1 1
μ
H
T1
BDX53A
T3
BC394
D3 1N4148
R4
270
R5
270
T4
BC393
T5
BC393
R6
20K
R7
3.3K
C16
1.8nF
R8
3.3K
C17
1.8nF
Z2 3.9V
Z1 3.9V
L2 1
μ
H
270
D4 1N4148
D2 BYW98100
R1
2
R2
2
C9
330nF
C10
330nF
T2
BDX54A
T6
BC393
T7
BC394
T8
BC394
R9
270
R10
270
R11
29K
OUT
IN
C7
100nF
C5
1000
μ
F
C8
100nF
C6
1000
μ
F
C1
1000
μ
F
C2
1000
μ
F
C3
100nF
C4
100nF
+40V
+20V
D1 BYW98100
GND
-20V
-40V
D93AU016
Figure 18:
High EfficiencyApplicationCircuit
APPLICATION INFORMATION
HIGH-EFFICIENCY
Constraints of implementing high power solutions
are the power dissipation and the size of the
power supply. These are both due to the low effi-
ciency of conventional AB class amplifier ap-
proaches.
Here below (figure 18) is described a circuit pro-
posal for a high efficiency amplifier which can be
adopted for both HI-FI and CAR-RADIO applica-
tions.
The TDA7294 is a monolithic MOS power ampli-
fier which can be operated at 80V supply voltage
(100V with no signal applied)while delivering out-
put currents up to
±
10 A.
This allows the use of this device as a very high
power amplifier (up to 180W as peak power with
T.H.D.=10 % and Rl = 4 Ohm);the only drawback
is the power dissipation, hardly manageable in
the above power range.
Figure 20 shows the power dissipation versus
output power curve for a class AB amplifier, com-
paredwith a high efficiencyone.
In orderto dimension the heatsink(and the power
supply), a generally used average output power
value is one tenth of the maximum output power
at T.H.D.=10 %.
From fig. 20, where the maximum power is
around 200 W, we get an average of 20 W, in this
condition, for a class AB amplifier the average
power dissipationis equalto 65 W.
The typical junction-to-case thermal resistance of
the TDA7294 is 1
avoid that, in worst case conditions, the chip tem-
perature exceedes 150
o
C, the thermalresistance
of the heatsink must be 0.038
o
C/W (@ max am-
bient temperatureof 50
o
C).
As the above value is pratically unreachable; a
high efficiency system is needed in those cases
where the continuousRMS output power is higher
than 50-60 W.
The TDA7294 was designed to work also in
higher efficiency way.
For this reason there are four power supply pins:
two intended for the signal part and two for the
power part.
T1 and T2 are two power transistors that only op-
erate when the output power reaches a certain
threshold (e.g. 20 W). If the output power in-
creases, these transistors are switched on during
the portion of the signal where more output volt-
age swing is needed, thus ”bootstrapping” the
power supplypins (#13 and #15).
The current generators formed by T4, T7, zener
o
C/W (max= 1.5
o
C/W). To
TDA7294
10/16
相關(guān)PDF資料
PDF描述
TDA7294 100V - 100W DMOS Audio Amplifier With Mute/ST-BY(帶消音和預(yù)備狀態(tài)的音頻放大器)
TDA7295 80V - 80W DMOS Audio Amplifier with Mute/ST-BY(帶消音和備用的80V-80W DMOS音頻放大器)
TDA7296S 60V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
TDA7296SV 60V - 60W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
TDA7297D 10W+10W DUAL BRIDGE AMPLIFIER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7294V 制造商:STMicroelectronics 功能描述:Audio Power Amplifier IC
TDA7295 功能描述:音頻放大器 80W Audio 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
TDA7295S 功能描述:音頻放大器 80W Audio 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
TDA7295SV 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:80V - 80W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
TDA7295V 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:80V - 80W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY
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