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TS4909 Datenblatt(PDF) 25 Page - STMicroelectronics

Teilenummer TS4909
Bauteilbeschribung  Dual mode low power 150mW stereo headphone amplifier with capacitor-less and single-ended outputs
PDF  32 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4909 Datenblatt(HTML) 25 Page - STMicroelectronics

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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 VPEAK = VCC/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 power supply voltage and load values.
P
diss
MAX
V
CC
2
π
2
R
L
------------- W
()
=
η
P
OUT
P
supply
-------------------
πV
PEAK
2V
CC
---------------------
==
η
π
4
---
78.5%
==
Icc
AVG
1
π
---
V
PEAK
R
L
-----------------
t
()
sin
t
d
0
π
∫
2V
PEAK
πR
L
--------------------- A
()
==
Icc (t)
Time
T/2
T
Vpeak/R
L
Icc
AVG
03T/2
2T
P
supply
V
CCICC
AVG
W
()
=
P
diss
22VCC
π R
L
---------------------- P
OUT
P
OUT W
()
–
=
P
OUT
∂
∂P
diss
0
=
P
diss
MAX
2V
CC
2
π
2
R
L
--------------- W
()
=



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