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(yè)數(shù)： 4/17頁(yè)
文件大?。?/td> 121K
代理商： TFA9841J
Philips Semiconductors
TFA9841J
1-channel audio amplifier (1 x SE)
Preliminary data
Rev. 01 — 06 February 2004
4 of 17
9397 750 12014
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
As shown in
Equation 2
, large capacitor values for the inputs are not necessary, so
the switch-on delay during charging of the input capacitors can be minimized. This
results in a good low frequency response and good switch-on behavior.
8.2 Power amplifier
The power amplifier is a Single-Ended (SE) amplifier with an all-NPN output stage,
capable of delivering a peak output current of 3 A.
8.2.1
Output power measurement
The output power as a function of the supply voltage is measured on the output pins
at THD = 10 %; see
Figure 5
.
The maximum output power is limited by the supply voltage of 26 V and the maximum
available output current is 3 A (repetitive peak current).
A minimum load of 4
is required for V
CC
> 22 V; see
Figure 6
8.2.2
Headroom
Typical CD music requires at least 12 dB (factor 15.85) dynamic headroom,
compared to the average power output, for transferring the loudest parts without
distortion. At V
CC
= 18 V and P
o
= 5 W (R
L
= 4
) at THD = 0.2 % (see
Figure 7
), the
Average Listening Level (ALL) music power without any distortion yields:
(3)
The power dissipation can be derived from
Figure 9
for a headroom of 0 dB and
12 dB, respectively (see
Table 4
).
For the average listening level a power dissipation of 2.2 W can be used for a
heatsink calculation.
8.3 Mode selection
The TFA9841J has three functional modes, which can be selected by applying the
proper DC voltage to pin MODE (see
Table 5
and
Figure 3
).
Table 4:
Headroom
0 dB
12 dB
Power rating as function of headroom
Power output (THD = 0.2 %)
P
o
= 5 W
P
o(ALL)
= 315 mW
Power dissipation
P
D
= 4.4 W
P
D
= 2.2 W
P
o ALL
)
3
15.85
---------------
315
mW
=
=
Table 5:
V
MODE
0 to 0.8 V
4.5 V to (V
CC
3.5 V)
(V
CC
2.0 V) to V
CC
Mode selection
Amplifier
standby
mute
on
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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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