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參數(shù)資料
| 型號： | TS4995EIJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.2 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封裝： | LEAD FREE, FCP-9 |
| 文件頁數(shù)： | 11/26頁 |
| 文件大?。?/td> | 440K |
| 代理商： | TS4995EIJT |
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TS4995
Application information
19/26
Therefore, the power dissipated by each amplifier is:
Pdiss = Psupply - Pout (W)
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 TS4995 is 125° C. However, in case of
overheating, a thermal shutdown set to 150° C, puts the TS4995 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:
●
The power supply voltage, VCC
●
The load resistor value, RL
●
The package type, Rthja
Example: VCC=5 V, RL=8 Ω, Rthja-flipchip= 100° C/W (100 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 = 125-100x0.633=61.7° C
P
diss
22V
CC
π R
L
---------------------- P
out Pout
–
=
Pdiss
P
out
--------------------- = 0
)
W
(
R
Vcc
2
max
Pdiss
L
2
π
=
η=
P
out
P
supply
------------------- =
πV
peak
4V
CC
--------------------
η= π
4
----- = 78.5%
T
amb
125
° CR
thja
P
dissmax
×
–
=
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