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TS4909 Datasheet(PDF) 25 Page - STMicroelectronics

No. de pieza TS4909
Descripción Electrónicos  Dual mode low power 150 mW stereo headphone amplifier with capacitor-less and single-ended outputs
PDF  35 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4909 Datasheet(HTML) 25 Page - STMicroelectronics

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TS4909
Application information
Doc ID 11972 Rev 9
25/35
4.4
Power dissipation and efficiency
Hypotheses
●
Voltage and current (V
out
and I
out
) in the load are sinusoidal.
●
The supply voltage (V
CC
) is a pure DC source.
Regarding the load we have:
and
and
4.4.1
Single-ended configuration
The average current delivered by the power supply voltage is:
Figure 80. Current delivered by power supply voltage in single-ended configuration
The power delivered by the power supply voltage is:
Therefore, the power dissipation by each power amplifier is:
and the maximum value is obtained when:
V
OUT
V
PEA K
ωtV
()
sin
=
I
OUT
V
OUT
R
L
-------------- A
()
=
P
OUT
V
PE AK
2
2R
L
----------------- A
()
=
Icc
AVG
1
2
π
------
V
PE AK
R
L
-----------------
t
()
sin
t
d
0
π
V
PEA K
πR
L
----------------- A
()
==
Icc (t)
Time
T/2
T
Icc
AVG
Vpeak/R
L
03T/2
2T
P
supp ly
V
CC
I
CC
AVG
W
()
=
P
diss
P
supp ly
P
OUT
W
()
–
=
P
diss
2V
CC
π R
L
------------------- P
OUT
P
OUT
W
()
–
=
P
OUT
∂
∂P
diss
0
=



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