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参数资料
| 型号： | TDA7294HS |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 100 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| 封装： | MULTIWATTH-15 |
| 文件页数： | 2/17页 |
| 文件大小： | 1464K |
| 代理商： | TDA7294HS |
TDA7294
3
1
4
13
7
815
2
14
6
10
R3 680
C11 22
F
L3 5
H
270
R16
13K
C15
22
F
9
R16
13K
C13 10
F
R13 20K
C11 330nF
R15 10K
C14
10
F
R14 30K
D5
1N4148
PLAY
ST-BY
270
L1 1
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
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
F
C8
100nF
C6
1000
F
C1
1000
F
C2
1000
F
C3
100nF
C4
100nF
+40V
+20V
D1 BYW98100
GND
-20V
-40V
D93AU016
Figure 18: High Efficiency Application Circuit
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-
pared with a high efficiency one.
In order to 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 dissipation is equal to 65 W.
The typical junction-to-case thermal resistance of
the TDA7294 is 1
oC/W (max= 1.5 oC/W). To
avoid that, in worst case conditions, the chip tem-
perature exceedes 150
oC, the thermal resistance
of the heatsink must be 0.038
oC/W (@ max am-
bient temperature of 50
oC).
As the above value is pratically unreachable; a
high efficiency system is needed in those cases
where the continuous RMS 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 supply pins (#13 and #15).
The current generators formed by T4, T7, zener
TDA7294
10/17
相关PDF资料 |
PDF描述 |
|---|---|
| TDA7295S | 80 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| TDA7295 | 80 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| TDA7296AV | 30 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| TDA7296SV | 60 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| TDA7296S | 60 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7294-HS | 制造商:STMicroelectronics 功能描述:TDA7294-HS - Bulk |
| TDA7294S | 功能描述:音频放大器 100W Audio 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 |
| TDA7294S_05 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7294SV | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY |
| TDA7294V | 功能描述:音频放大器 100W Audio 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 |
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