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TS4975 Datasheet(PDF) 22 Page - STMicroelectronics

Part # TS4975
Description  Stereo Headphone Drive Amplifier with Digital Volume Control via IC Bus
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4975 Datasheet(HTML) 22 Page - STMicroelectronics

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Application Information
TS4975
22/33
4.2
Power dissipation and efficiency
Hypotheses:
●
Voltage and current in the load are sinusoidal (Vout and Iout).
●
Supply voltage is a pure DC source (Vcc).
Regarding the load we have:
and
and
Single-ended configuration:
The average current delivered by the supply voltage is:
Figure 59. Current delivered by supply voltage in single-ended model
The power delivered by supply voltage is:
So, the power dissipation by each amplifier is
and the maximum value is obtained when:
V
OUT
V
PEAK
ωtV
()
sin
=
I
OUT
V
OUT
R
L
-------------- A
()
=
P
OUT
V
PEAK
2
2R
L
----------------- A
()
=
Icc
AVG
1
2
π
------
V
PEAK
R
L
-----------------
t
()
sin
t
d
0
π
∫
V
PEAK
πR
L
----------------- A
()
==
P
supply
V
CCICC
AVG
W
()
=
P
diss
P
supply POUT W
()
–
=
P
diss
2VCC
π R
L
-------------------P
OUT
P
OUT W
()
–
=
P
OUT
∂
∂P
diss
0
=



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