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TS4909 Datasheet(PDF) 26 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) 26 Page - STMicroelectronics

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Application information
TS4909
26/35
Doc ID 11972 Rev 9
and its value is:
Note:
This maximum value depends only on the power supply voltage and load values.
The
efficiency is the ratio between the output power and the power supply.
The
maximum theoretical value is reached when V
PEAK
= V
CC
/2, so:
4.4.2
Phantom ground configuration
The average current delivered by the power supply voltage is:
Figure 81. Current delivered by power supply voltage in phantom ground
configuration
The power delivered by the power supply voltage is:
Therefore, the power dissipation by each amplifier is:
and the maximum value is obtained when:
and its value is:
Note:
This maximum value depends only on the power supply voltage and load values.
P
diss
MA X
V
CC
2
π2R
L
------------- W
()
=
η
P
OUT
P
supp ly
-------------------
πV
P EAK
2V
CC
---------------------
==
η
π
4
---
78.5 %
==
Ic c
AV G
1
π
---
V
P EAK
R
L
-----------------
t
()
sin
t
d
0
π
2V
P EAK
πR
L
--------------------- A
()
==
Icc (t)
Time
T/2
T
Vpeak/R
L
Icc
AVG
03T/2
2T
P
supp ly
V
CC
I
CC
AVG
W
()
=
P
di ss
22 V
CC
π R
L
---------------------- P
OUT
P
OUT
W
()
–
=
P
OUT
∂
∂P
diss
0
=
P
di ss
MAX
2V
CC
2
π2R
L
--------------- W
()
=



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