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參數(shù)資料
| 型號： | TS4982IQT |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, QFN-32 |
| 文件頁數(shù)： | 16/31頁 |
| 文件大小： | 537K |
| 代理商： | TS4982IQT |
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TS4982
Application information
Doc ID 14527 Rev 2
23/31
4.8.2
Charge pump capacitors Cp and Cps
A proper selection of the charge pump capacitors Cp and Cps is necessary to generate an
efficient negative voltage by the internal charge pump without a negative impact on the
audio performance.
The following are some recommendations for the decoupling and charge pump capacitors.
●
Low ESR capacitors are needed to minimize the output resistance of the charge pump.
●
An X7R dielectric type for large temperature ranges should be used.
●
Placement of the component as close to the package pins as possible. Small packages
(for instance SMD 0603, 0402) make it easier.
●
Use of a 10 V DC rating voltage for 5 V operation or 6.3 V DC rating operation for 3 V
operation with regard to the
ΔC/ΔV variation of this type of dielectric.
●
For a typical application a 1
μF ceramic capacitor is recommended (see Figure 1 on
4.9
Wake-up time
When the standby is released to turn the device ON, the bypass capacitor Cb is charged
immediately. As Cb is directly linked to the bias of the loudspeaker amplifier, the bias will not
work properly until the Cb voltage is correct. The time to reach this voltage plus a time delay
of 1 ms (pop precaution) is called the wake-up time or tWU. It is specified in the electrical
characteristics with Cb = 1 F in Table7 on page7.
If Cb has a value other than 1 F, you can calculate the typical tWU by using the following
formula, or read it directly from the graph (Figure 44).
Figure 44.
Typical wake-up time vs. bypass capacitor
If the headphone (speaker) is already out of the standby mode and the speaker
(headphone) is enabled there is no need to charge Cb. Therefore, the wake-up time is only
the pop precaution delay of 1 ms (typical).
t
WU s
[]
5199
Cb
0.001[F]
+
=
012
34
5
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
T
AMB
=25°C
Wake-up
Tim
e
(ms)
Cb (
μF)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS4984 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2 x 1W Stereo audio power amplifier with active low standby mode |
| TS4984EIJT | 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TS4984EIKJT | 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 |
| 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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