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參數資料
| 型號： | TS4984EIKJT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA15 |
| 封裝： | LEAD FREE, FCP-15 |
| 文件頁數： | 14/30頁 |
| 文件大小： | 1644K |
| 代理商： | TS4984EIKJT |
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TS4984FC
Application Information
21/30
and the maximum value is obtained when:
and its value is:
Note:
This maximum value is only depending on power supply voltage and load values.
The efficiency,
η, is the ratio between the output power and the power supply:
The maximum theoretical value is reached when
VPEAK = VCC, so that:
The TS4984 has two independent power amplifiers, and each amplifier produces heat due to its
power dissipation. Therefore, the maximum die temperature is the sum of the each amplifier’s
maximum power dissipation. It is calculated as follows:
Pdiss1 = Power dissipation due to the 1st channel power amplifier.
Pdiss2 = Power dissipation due to the 2nd channel power amplifier.
Total Pdiss =Pdiss1 +Pdiss2 (W)
In most cases, Pdiss1 = Pdiss2, giving:
or, stated differently:
4.5
Decoupling the circuit
Two capacitors are needed to correctly bypass the TS4984. A power supply bypass capacitor
CS and a bias voltage bypass capacitor Cb.
CS has particular influence on the THD+N in the high frequency region (above 7kHz) and an
indirect influence on power supply disturbances. With a value for CS of 1F, you can expect
similar THD+N performances to those shown in the datasheet. For example:
●
In the high frequency region, if CS is lower than 1F, it increases THD+N and disturbances
on the power supply rail are less filtered.
●
On the other hand, if CS is higher than 1F, those disturbances on the power supply rail
are more filtered.
Cb has an influence on THD+N at lower frequencies, but its function is critical to the final result
of PSRR (with input grounded and in the lower frequency region), in the following manner:
●
If Cb is lower than 1F, THD+N increases at lower frequencies and PSRR worsens.
P
diss
P
ou t
------------------ = 0
P
dissmax
2V
cc
2
π2R
L
-------------
=
W
()
η =
P
ou t
P
su pp ly
------------------- =
πV
PEAK
4V
CC
-----------------------
π
4
----- = 78.5%
Total P
diss
P
d iss1
P
diss2
(W)
=
Total P
diss
42V
CC
π R
L
---------------------- P
out
2P
out
–
=
W
()
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TS4984FC | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.2W Stereo Audio Power Amplifier with Active Low Standby Mode |
| TS4984IQT | 功能描述:音頻放大器 2x1W stereo audio Pwr amp RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TS4985 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
| TS4985EIJT | 功能描述:音頻放大器 2x1.2W stereo audio RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TS4985EIKJT | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2x1.2w Stereo Audio Power Amplifier with Dedicated Standby Pins |
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