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TS4890IST 数据表(PDF) 34 Page - STMicroelectronics

部件名 TS4890IST
功能描述  Rail-to-rail output 1 W audio power amplifier with standby mode active low
PDF  46 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TS4890IST 数据表(HTML) 34 Page - STMicroelectronics

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Application information
TS4890
34/46
DocID8396 Rev 7
5.4
Power dissipation and efficiency
Hypothesis:
•
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
Then, 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 the amplifier is Pdiss = Psupply - Pout (W)
and the maximum value is obtained when
and its value is
Remark: This maximum value is only depending on power supply voltage and load values.
The efficiency is the ratio between the output power and the power supply.
V
OUT
V
PEAK
ωtV
()
sin
=
I
OUT
V
OUT
R
L
-------------- A
()
=
P
OUT
V
PEAK
2
2R
L
------------------- W
()
=
Icc
AVG
2
V
PEAK
πR
L
----------------- A
()
=
Pdiss
22Vcc
R
L
π
---------------------- P
OUT
P
OUT W
()
–
=
∂Pdiss
∂P
OUT
-------------------
0
=
Pdissmax
2Vcc
2
π
2
R
L
----------------- W
()
=



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