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| 型号： | TS4972 |
| 厂商： | 意法半导体 |
| 英文描述： | 1.2W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
| 中文描述： | 为1.2W音频功率放大器，具有活性高备用模式 |
| 文件页数： | 25/28页 |
| 文件大小： | 904K |
| 代理商： | TS4972 |
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TS4972
25/28
I
Note on how to use the PSRR curves
(page 7)
We have finished a design and we have chosen
the components values :
Rin=Rfeed=22k
Cin=100nF
Cb=1μF
Now, on fig. 13, we can see the PSRR (input
grounded) vs frequency curves. At 217Hz we have
a PSRR value of -36dB.
In reality we want a value about -70dB. So, we
need a gain of 34dB !
Now, on fig. 12 we can see the effect of Cb on the
PSRR (input grounded) vs. frequency. With
Cb=100μF, we can reach the -70dB value.
The process to obtain the final curve (Cb=100μF,
Cin=100nF, Rin=Rfeed=22k
) is a simple transfer
point by point on each frequency of the curve on
fig. 13 to the curve on fig. 12.
The measurement result is shown on the next
figure.
Fig. 85 : PSRR changes with Cb
I
Note on PSRR measurement
What is the PSRR
The PSRR is the Power Supply Rejection Ratio.
It's a kind of SVR in a determined frequency range.
The PSRR of a device, is the ratio between a
power supply disturbance and the result on the
output. We can say that the PSRR is the ability of
a device to minimize the impact of power supply
disturbances to the output.
How we measure the PSRR
Fig. 86 : PSRR measurement schematic
I
Principle of operation
We fixed the DC voltage supply (Vcc)
We fixed the AC sinusoidal ripple voltage
(Vripple)
No bypass capacitor Cs is used
The PSRR value for each frequency is:
Remark : The measure of the Rms voltage is not a
Rms selective measure but a full range (2 Hz to
125 kHz) Rms measure. It means that we
measure the effective Rms signal + the noise.
10
100
1000
10000
100000
-70
-60
-50
-40
-30
Cin=100nF
Cb=100
μ
F
Cin=100nF
Cb=1
μ
F
Vcc = 5, 3.3 & 2.6V
Rfeed = 22k, Rin = 22k
Rg = 100
, RL = 8
Tamb = 25
°
C
P
Frequency (Hz)
Vcc
Vripple
Vs-
Vs+
RL
Cb
Rfeed
Rin
Rg
Cin
Bias
AV = -1
Vin-
Vin+
Bypass
Standby
V
G
Vout 1
Vout 2
+
-
+
-
1
3
6
8
2
5
7
4
TS4972
PSRR dB
)
= 20 x Log
10
ripple
Rms Vs
+
- Vs-
)
)
---Rms V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TS4972_04 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.2W Audio Power Amplifier with Standby Mode Active High |
| TS4972EIJT | 功能描述:音频放大器 1.2W audio power amp W/Standby 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 |
| TS4972EIJT1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.2W Audio Power Amplifier with Standby Mode Active High |
| TS4972IJT | 制造商:STMicroelectronics 功能描述: |
| TS4972JT | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1.2W AUDIO POWER AMPLIFIER WITH STANDBY MODE ACTIVE HIGH |
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