STMicroelectronics 1.2 W fully differential audio power amplifier DEMOTS4995J DEMOTS4995J Data Sheet
Product codes
DEMOTS4995J
Application information
TS4995
18/26
Figure 56.
-3 dB lower cut-off frequency vs. input capacitance
4.4
Power dissipation and efficiency
Assumptions:
●
Load voltage and current are sinusoidal (V
out
and I
out
)
●
Supply voltage is a pure DC source (V
CC
)
The output voltage is:
and
and
Therefore, the average current delivered by the supply voltage is:
Equation 1
The power delivered by the supply voltage is:
Equation 2
P
supply
= V
CC
I
ccAVG
(W)
0.5
1
10
100
Typical Input
Impedance
Impedance
Maximum Input
Impedance
Impedance
Minimum Input
Impedance
Impedance
All gain setting
Tamb=25
Tamb=25
°
C
L
o
w
-3dB
C
u
t O
ff
Freq
uency (H
z
)
Input Capacitor Cin (
μ
F)
0.1
V
out
= V
peak
sin
ω
t (V)
I
out
=
V
out
R
L
-------------
(A)
P
out
=
V
peak
2
2R
L
---------------------
(W)
Icc AVG = 2
V
peak
π
R
L
-----------------
(A)