TS488(2019) 查看數據表（PDF） - STMicroelectronics
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TS488 Datasheet PDF : 32 Pages
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TS488
Total power dissipation
Note:
5.2
5.3
PdissMAX
=
V2CC
π2RL
(W)
(9)
This maximum value depends only on power supply voltage and load values.
The efficiency is the ratio between the output power and the power supply:
η
=
POUT
Psupply
=
πVpeak
2VCC
(10)
The maximum theoretical value is reached when Vpeak = VCC/2, so
η
=
π
4
=
78.5 %
(11)
Total power dissipation
The TS488 is stereo (dual channel) amplifier. It has two independent power amplifiers. Each amplifier produces
heat due to its power dissipation. Therefore the maximum die temperature is the sum of each amplifier’s
maximum power dissipation. It is calculated as follows:
• Pdiss R = power dissipation due to the right channel power amplifier
• Pdiss L = power dissipation due to the left channel power amplifier
• Total Pdiss = Pdiss R + Pdiss L (W)
Typically, Pdiss R is equal to Pdiss L, giving:
TotalPdiss = 2PdissR = 2PdissL
TotalPdiss
=
2 2VCC
π RL
POUT − 2POUT
(12)
Lower cut-off frequency
The lower cut-off frequency FCL of the amplifier depends on input capacitors Cin and output capacitors Cout.
The input capacitor Cin (output capacitor Cout) in serial with the input resistor Rin (load resistor RL) of the amplifier
is equivalent to a first order high pass filter. Assuming that FCL is the lowest frequency to be amplified (with a 3 dB
attenuation), the minimum value of the Cin (Cout) is:
Cin
=
1
2π ⋅ FCL ⋅
Rin
Cout
=
2π
⋅
1
FCL
⋅
RL
(13)
Figure 75. Lower cut-off frequency vs. input capacitor
10k
Rin=10kΩ
Rin=20k Ω
1k
Rin=50kΩ
Rin=100k Ω
100
Figure 76. Lower cut-off frequency vs. output capacitor
10k
RL=16Ω
RL=32Ω
1k
RL=600Ω
100
101
10
100
1000
Cin (nF)
10
0.1
1
10
100
1000
Cout (μF)
DS4579 - Rev 7
page 21/32
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