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TS4994IST датащи(PDF) 24 Page - STMicroelectronics

номер детали TS4994IST
подробное описание детали  1W Differential Input/Output Audio Power Amplifier with Selectable Standby
PDF  31 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4994IST датащи(HTML) 24 Page - STMicroelectronics

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TS4994
Application Information
24/31
4.6 Power dissipation and efficiency
Assumptions:
l Load voltage and current are sinusoidal (Vout and Iout)
l Supply voltage is a pure DC source (Vcc)
Regarding the load we have:
and
and
Therefore, the average current delivered by the supply voltage is:
The power delivered by the supply voltage is:
Psupply = Vcc IccAVG (W)
Then, the power dissipated by each amplifier is
Pdiss = Psupply - Pout (W)
and the maximum value is obtained when:
and its value is:
Note:
This maximum value is only dependent on 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, so
V
out = V PEAK sinω t (V)
I
out =
V
out
R L
-------------- (A)
P
out =
VPE AK
2
2RL
---------------------- (W)
ICC
AVG
= 2
VPEAK
πRL
-------------------- (A)
P
diss
22V
CC
π R
L
------------------------ P
out Pou t
–
=
∂Pdiss
∂P
out
---------------------- = 0
)
W
(
R
Vcc
2
max
Pdiss
L
2
2
π
=
η =
P
out
P
supply
--------------------- = π
VPEAK
4VCC
-----------------------
π
4
----- = 78.5%



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