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TS4974 Folha de dados(PDF) 18 Page - STMicroelectronics

Nome de Peças TS4974
Descrição Electrónicos  1W differential audio power amplifier with up/down digital volume control pins
PDF  25 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4974 Folha de dados(HTML) 18 Page - STMicroelectronics

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Application information
TS4974
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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 TS4974 is 125°C. However, in case of
overheating, a thermal shutdown set to 150° C, puts the TS4974 in standby until the
temperature of the die is reduced by about 5° C.
To calculate the maximum ambient temperature Tamb allowable, you need to know:
●
Power supply voltage value, VCC
●
Load resistor value, RL
●
The package type, RTHJA
Example: VCC=5 V, RL=8 Ω, RTHJAflip-chip=80° C/W (125 mm
2 copper heatsink).
Using the power dissipation formula given above in Equation 3 this gives a result of:
Pdissmax = 633mW
Tamb is calculated as follows:
Equation 5
Therefore, the maximum allowable value for Tamb is:
Tamb = 125-80x0.633 = 74.3°C
∂Pdiss
∂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%
T
amb
125
° CR
TJHA
P
dissmax
×
–
=



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