參數(shù)資料
型號(hào)： TS4994IST
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： LEAD FREE, MINI, SO-8
文件頁數(shù)： 19/35頁
文件大?。?/td> 483K
代理商： TS4994IST
Application information
TS4994
26/35
Figure 77 and Figure 78 show CMRR versus frequency for a typical application with a
random selection of four
ΔR/R values with a 0.1% tolerance.
4.7
Power dissipation and efficiency
Assumptions:
●
Load voltage and current are sinusoidal (Vout and Iout)
●
Supply voltage is a pure DC source (VCC)
The output voltage is:
and
Figure 75.
CMR vs. frequency (worst case
conditions)
Figure 76.
CMR vs. frequency (worst case
conditions)
100
1000
10000
-60
-50
-40
-30
-20
-10
0
Cb=1
μF
Cb=0
20k
20
Vcc = 5V
Vic = 200mVpp
Av = 1, Cin = 470
μF
ΔR/R = 0.1%, RL ≥ 8Ω
Tamb = 25
°C
CMRR
(
d
B)
Frequency (Hz)
100
1000
10000
-60
-50
-40
-30
-20
-10
0
Cb=1
μF
Cb=0
20k
20
Vcc = 2.5V
Vic = 200mVpp
Av = 1, Cin = 470
μF
ΔR/R = 0.1%, RL ≥ 8Ω
Tamb = 25
°C
CMRR
(
d
B)
Frequency (Hz)
Figure 77.
CMR vs. frequency with random
choice condition
Figure 78.
CMR vs. frequency with random
choice condition
100
1000
10000
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Cb=1
μF
Cb=0
20k
20
Vcc = 5V
Vic = 200mVpp
Av = 1, Cin = 470
μF
ΔR/R ≤ 0.1%, RL ≥ 8Ω
Tamb = 25
°C
CMRR
(
d
B)
Frequency (Hz)
100
1000
10000
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
Cb=1
μF
Cb=0
20k
20
Vcc = 2.5V
Vic = 200mVpp
Av = 1, Cin = 470
μF
ΔR/R ≤ 0.1%, RL ≥ 8Ω
Tamb = 25
°C
CMRR
(
d
B)
Frequency (Hz)
V
out = Vpeak sinωt (V)
I
out =
V
out
R
L
------------- (A)
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