參數(shù)資料
型號(hào)： TS4871IS
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝： MICRO, PLASTIC, SO-8
文件頁(yè)數(shù)： 19/28頁(yè)
文件大?。?/td> 383K
代理商： TS4871IS
TS4871
26/28
s 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. 85 : PSRR measurement schematic
s 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.
Vripple
Vcc
Rin
Cin
Rg
100 Ohms
Cb
Rfeed
4
3
2
1
5
8
Vin-
Vin+
-
+
-
+
Bypass
Standby
Bias
6
Vout1
Vout2
Av=-1
TS4871
Vs-
Vs+
RL
Vcc
GND
7
PSRR dB
() = 20 x Log
10
Rms Vr ippl e
()
Rms Vs + -Vs-
()
---------------------------------------------
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TS4872 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:RAIL TO RAIL INPUT/OUTPUT 1W AUDIO POWER AMPLIFIER WITH STANDBY MODE
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