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TS4956 Folha de dados(PDF) 39 Page - STMicroelectronics

Nome de Peças TS4956
Descrição Electrónicos  Stereo audio amplifier system with I2C bus interface
PDF  51 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4956 Folha de dados(HTML) 39 Page - STMicroelectronics

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TS4956
Application information
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The efficiency is the ratio between the output power and the power supply:
The maximum theoretical value is reached when VPEAK = VCC/2, so
The TS4956 has in modes 3 and 4 two active output power amplifiers. Each amplifier
produces heat due to its power dissipation. Therefore the maximum die temperature is the
sum of each amplifier’s maximum power dissipation. It is calculated as follows:
Pdiss 1 = power dissipation due to the first power amplifier.
Pdiss 2 = power dissipation due to the second power amplifier.
Total Pdiss =Pdiss 1 +Pdiss 2 (W)
In most cases,
Pdiss 1 =Pdiss 2, giving:
4.3.3
BTL output configuration (modes 1, 2, 7):
The average current delivered by the supply voltage is:
Figure 128. Current delivered by supply voltage in the BTL output configuration
The power delivered by supply voltage is:
Then, the power dissipation by each amplifier is
η
P
out
P
su pply
-------------------
πV
PEAK
4V
CC
---------------------
==
η
π
8
---
39.25%
==
TotalP
diss
2P
diss1
=
TotalP
diss
42VCC
π R
L
---------------------- P
out
2P
ou t W
()
–
=
Icc
AVG
1
π
---
V
PEAK
R
L
-----------------
t
()
sin
t
d
0
π
∫
2V
PEAK
πR
L
---------------------A
()
==
P
sup ply
V
CCICC
AV G
W
()
=
P
diss
22 VCC
π R
L
---------------------- P
ou t
P
out W
()
–
=



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