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參數(shù)資料
| 型號(hào)： | TFA9841J |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1-channel audio amplifier |
| 中文描述： | 7.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM9 |
| 封裝： | PLASTIC, SOT-523-1, DIL-BENT-SIL, 9 PIN |
| 文件頁數(shù)： | 5/17頁 |
| 文件大小： | 121K |
| 代理商： | TFA9841J |
Philips Semiconductors
TFA9841J
1-channel audio amplifier (1 x SE)
Preliminary data
Rev. 01 — 06 February 2004
5 of 17
9397 750 12014
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Standby —
The current consumption is very low and the output is floating. The
device is in standby mode when V
MODE
< 0.8 V, or when pin MODE is grounded.
Mute —
The amplifier is DC-biased but not operational (no audio output). This allows
the input coupling capacitors to be charged to avoid pop-noise. The device is in mute
mode when 4.5 V < V
MODE
< (V
CC
3.5 V).
On —
The amplifier is operating normally. The operating mode is activated at
V
MODE
> (V
CC
2.0 V).
8.4 Supply voltage ripple rejection
The supply voltage ripple rejection (SVRR) is measured with an electrolytic capacitor
of 150
μ
F on pin SVR using a bandwidth of 20 Hz to 22 kHz.
Figure 10
illustrates the
SVRR as function of the frequency. A larger capacitor value on pin SVR improves the
ripple rejection behavior at the lower frequencies.
8.5 Built-in protection circuits
The TFA9841J contains two types of temperature sensors; one measures local
temperatures of the power stage and one measures the global chip temperature. At a
local temperature of the power stage of approximately 185
o
C or a global temperature
of approximately 150
o
C, this detection circuit switches off the power stage for 2 ms.
High impedance of the output is the result. After this time period, the power stage
switches on automatically and the detection will take place again; still a too high
temperature switches off the power stage immediately. This protects the TFA9841J
against shorts to ground, to the supply voltage, across the load and too high chip
temperatures.
The protection will only be activated when necessary, so even during a short-circuit
condition, a certain amount of (pulsed) current will still be flowing through the short,
just as much as the power stage can handle without exceeding the critical
temperature level.
Fig 3.
Mode selection.
MDB797
standby
mute
on
0.8
4.5
VCC
3.5
VCC
VMODE (V)
VCC
2.0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TFA9841J/N1,112 | 功能描述:音頻放大器 1 X 7W SINGLE ENDED 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 |
| TFA9842AJ | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:7.5 W stereo power amplifier with volume control |
| TFA9842AJ/N1 | 功能描述:音頻放大器 2X7.5W SE MPA W/VOL CTRL 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 |
| TFA9842AJ/N1,112 | 功能描述:音頻放大器 2X7.5W SE MPA W/VOL 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 |
| TFA9842BJ | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2-channel audio amplifier (SE: 1 W to 7.5 W) |
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