參數(shù)資料
型號： TS4998IQT
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： 1 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC16
封裝： 4 X 4 MM, ROHS COMPLIANT, QFN-16
文件頁數(shù)： 21/33頁
文件大小： 488K
代理商： TS4998IQT
Application information
TS4998
28/33
4.13
Notes on PSRR measurement
What is the PSRR?
The PSRR is the power supply rejection ratio. The PSRR of a device is the ratio between a
power supply disturbance and the result on the output. In other words, the PSRR is the
ability of a device to minimize the impact of power supply disturbance to the output.
How is the PSRR measured?
The PSRR is measured as shown in Figure 68.
Figure 68.
PSRR measurement
Principles of operation
●
The DC voltage supply (VCC) is fixed
●
The AC sinusoidal ripple voltage (Vripple) is fixed
●
No bypass capacitor CS is used
The PSRR value for each frequency is calculated as:
RMS is an rms selective measurement.
Cin1
4.7uF
Cb
1uF
Rin1
Rin2
Rin3
Rin4
Cin2
4.7uF
Cin3
4.7uF
Cin4
4.7uF
ST
BY
LC
ont
ro
l
ST
BYR
C
o
nt
ro
l
RL
8Ohms
RL
8Ohms
Vcc
Vripple
1
2
4
3
13
5
6
14
12
11
9
10
8
7
BIAS
STBY
LEFT
RIGHT
LI N-
RIN-
LI N+
RIN+
Bypass
GND
LOUT-
LOUT+
ROUT-
ROUT+
-
+
-
ST
B
Y
L
ST
B
Y
R
Vcc
TS4998
U1
TS4998 - QFN16
PSRR
20
Log
RMS
Output
()
RMS
Vripple
()
----------------------------------
×
dB
()
=
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