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參數(shù)資料
| 型號(hào)： | TS4984EKIJT |
| 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(shù)： | 14/29頁 |
| 文件大?。?/td> | 1751K |
| 代理商： | TS4984EKIJT |
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TS4984FC
Application Information
21/29
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:
Pdiss L = Power dissipation due to the left channel power amplifier.
Pdiss R = Power dissipation due to the right channel power amplifier.
Total Pdiss =Pdiss L +Pdiss R (W)
In most cases,
Pdiss L = Pdiss R, 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.
●
If Cb is higher than 1F, the benefit on THD+N at lower frequencies is small, but the benefit
to PSRR is substantial.
Note that
Cin has a non-negligible effect on PSRR at lower frequencies. The lower the value of
Cin, the higher the PSRR.
4.6
Wake-up time, TWU
When the standby is released to put the device ON, the bypass capacitor
Cb will not be charged
immediately. As
Cb is directly linked to the bias of the amplifier, the bias will not work properly
until the
Cb voltage is correct. The time to reach this voltage is called wake-up time or TWU and
specified in electrical characteristics table with
Cb = 1F.
If
time value.
Total P
diss
2P
dis sL
(W)
=
Total P
diss
42V
CC
π R
L
-----------------------P
out
2P
out
–
=
W
()
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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(chǎn)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(fēng)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(chǎn)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(fēng)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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