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参数资料
| 型号： | TS4902 |
| 厂商： | 意法半导体 |
| 英文描述： | 300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW |
| 中文描述： | 在3.3V电源音频功率放大器具有待机模式300mW的低电平 |
| 文件页数： | 15/19页 |
| 文件大小： | 399K |
| 代理商： | TS4902 |
TS4902
15/19
I
BTL Configuration Principle
The TS4902 is a monolithic power amplifier with a
BTL (Bridge Tied Load) output configuration. BTL
means that each end of the load is connected to
two single ended output amplifiers. Thus, we have:
Single ended output 1 = Vout1 = Vout (V)
Single ended output 2 = Vout2 = -Vout (V)
And Vout1 - Vout2 = 2Vout (V)
The output power is :
For the same power supply voltage, the output
power in BTL configuration is four times higher
than
the output power in
configuration.
I
Gain In Typical Application Schematic
(cf. page 1)
single ended
In flat region (no effect of Cin), the output voltage
of the first stage is :
For the second stage : Vout2 = -Vout1 (V)
The differential output voltage is
The differential gain named gain (Gv) for more
convenient usage is :
Remark : Vout2 is in phase with Vin and Vout1 is
180 phased with Vin. It means that the positive
terminal of the loudspeaker should be connected
to Vout2 and the negative to Vout1.
I
Low and high frequency response
In low frequency region, the effect of Cin starts.
Cin with Rin forms a high pass filter with a -3dB cut
off frequency
In high frequency region, you can limit the
bandwidth by adding a capacitor (Cfeed) in
parallel with Rfeed. Its form a low pass filter with a
-3dB cut off frequency
I
Power dissipation and efficiency
Hypothesis :
Voltage and current in the load are sinusoidal
(Vout and Iout)
Supply voltage is a pure DC source (Vcc)
Regarding the load we have :
and
and
Then, the average current delivered by the supply
voltage is:
The power delivered by the supply voltage is
Psupply = Vcc Icc
AVG
(W)
Then, the
power dissipated by the amplifier
is
Pdiss = Psupply - Pout (W)
and the maximum value is obtained when
P
OUT
and its value is:
Remark : This maximum value is only depending
on power supply voltage and load values.
)
W
(
R
)
Vout
2
(
Pout
L
2
RMS
=
Vout1 = Vin
–
Rin
Rfeed
Vout2
Vout1 = 2Vin
–
Rfeed
Rin
------------------- (V)
Gv = -------------------------------------- = 2 -------------------
Vout1
Vin
–
Rin
F
CL
=
2
π
Rin Cin
-------------1
(
)
F
CH
=
2
π
Rfeed Cfeed
----------------------1
(
)
V
OUT
= V
PEAK
sin
ω
t (V)
I
OUT
= V
R
L
---------------- (A)
P
OUT
= V
PEAK2
---------------------- (W)
2R
L
I
CC AVG
= 2V
π
R
L
------------------- (A)
P
diss
= ---------------------- P
OUT
π
R
L
P
OUT
(W)
–
--Pdiss
)
W
(
R
Vcc
2
π
2
max
Pdiss
L
2
=
相关PDF资料 |
PDF描述 |
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| TS4902ID | 300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW |
| TS4902IDT | 300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW |
| TS4902IS | 300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW |
| TS4902IST | 300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW |
| TS494 | Voltage Mode PWM Controller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4902ID | 功能描述:音频放大器 300mW Audio Pwr Amp 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 |
| TS4902IDT | 功能描述:音频放大器 300mW Audio Pwr Amp 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 |
| TS4902IS | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:300mW at 3.3V SUPPLY AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE LOW |
| TS4902IST | 功能描述:音频放大器 300mW Audio Pwr Amp 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 |
| TS4909 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Dual mode low power 150mW stereo headphone amplifier with capacitor-less and single-ended outputs |
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