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TS4994FC 数据表(PDF) 29 Page - STMicroelectronics

部件名 TS4994FC
功能描述  1.2 W differential input/output audio power amplifier with selectable standby
PDF  35 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TS4994FC 数据表(HTML) 29 Page - STMicroelectronics

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TS4994FC
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and
Therefore, the average current delivered by the supply voltage is:
Equation 1
The power delivered by the supply voltage is:
Therefore, the power dissipated by each amplifier is:
Equation 2
and the maximum value is obtained when:
and its value is:
Equation 3
Note:
This maximum value is only dependent on the power supply voltage and load values.
The efficiency is the ratio between the output power and the power supply:
Equation 4
The maximum theoretical value is reached when Vpeak = VCC, so:
The maximum die temperature allowable for the TS4994 is 125°C. However, in case of
overheating, a thermal shutdown set to 150°C, puts the TS4994 in standby until the
temperature of the die is reduced by about 5°C.
P
out =
V
peak
2
2R
L
--------------------- (W)
I
CC
AVG = 2
V
peak
πR
L
----------------- (A)
P
supply
V
CC
I
CC
AVG
(W)
⋅
=
P
diss
P
supply
P
out
(W)
–
=
P
diss
22V
CC
π R
L
---------------------- P
out Pout
–
=
∂P
diss
∂P
out
----------------- = 0
)
W
(
R
Vcc
2
max
Pdiss
L
2
2
π
=
η=
P
out
P
supply
------------------- =
πV
peak
4V
CC
--------------------
η= π
4
----- = 78.5%



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