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參數資料
| 型號： | TS4998IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC16 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QFN-16 |
| 文件頁數： | 17/33頁 |
| 文件大?。?/td> | 488K |
| 代理商： | TS4998IQT |
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Application information
TS4998
24/33
The efficiency is the ratio between the output power and the power supply:
Equation 6
The maximum theoretical value is reached when Vpeak = VCC, so:
The TS4998 is stereo amplifier so it has two 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 1 = Power dissipation of left channel power amplifier
●
Pdiss 2 = Power dissipation of right channel power amplifier
●
Total Pdiss =Pdiss 1 + Pdiss 2 (W)
In most cases, Pdiss 1 = Pdiss 2, giving:
The maximum die temperature allowable for the TS4998 is 150°C. In case of overheating, a
thermal shutdown protection set to 150°C, puts the TS4998 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 value, VCC
●
the load resistor value, RL
●
the package type, RTHJA
Example: VCC=5V, RL=8Ω, RTHJAQFN16=85°C/W (with 2-layer PCB with vias).
Using the power dissipation formula given in Equation 5, the maximum dissipated power per
channel is:
Pdissmax = 633mW
And the power dissipated by both channels is:
Total Pdissmax = 2 x Pdissmax = 1266mW
Tamb is calculated as follows:
Equation 7
Therefore, the maximum allowable value for Tamb is:
Tamb = 150 - 85 x 2 x 1.266=42.4°C
If a 4-layer PCB with vias is used, RTHJAQFN16 = 45°C/W and the maximum allowable
value for Tamb in this case is:
Tamb = 150 - 45 x 2 x 1.266 = 93°C
η=
P
out
P
supply
------------------- =
πV
peak
4Vcc
--------------------
η= π
4
----- = 78.5%
TotalP
diss = 2
P
diss1
×
42V
CC
π R
L
---------------------- P
out 2Pout W
()
–
=
T
amb
150
° CR
TJHA
TotalP
dissmax
×
–
=
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相關代理商/技術參數 |
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|---|---|
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| TS4A1S00A | 制造商:APEM 功能描述:Joystick, Two Axis, Miniature Hall Effect, Fingertip Handle |
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