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参数资料
| 型号： | TDA8946AJ |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 15 W, 2 CHANNEL, AUDIO AMPLIFIER, PZIP17 |
| 封装： | PLASTIC, DIL-BENT-SIL, 17 PIN |
| 文件页数： | 16/20页 |
| 文件大小： | 376K |
| 代理商： | TDA8946AJ |
Philips Semiconductors
TDA8946AJ
2 x 15 W BTL audio amplier with DC gain control
Product data
Rev. 01 — 01 March 2002
5 of 20
9397 750 09434
Koninklijke Philips Electronics N.V. 2002. All rights reserved.
The input cut-off frequency is:
(1)
For Ri =32k and Ci = 220 nF:
(2)
As shown in Equation 2, large capacitors 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 behaviour.
Remark: To prevent high frequency oscillations do not leave the inputs open, connect
a capacitor of 4.7 nF across the input pins close to the device (see Figure 15).
8.2 Power amplier
The power amplier is a Bridge-Tied Load (BTL) amplier with an all-NPN output
stage, capable of delivering a peak output current of 2 A.
The BTL principle offers the following advantages:
Lower peak value of the supply current
The ripple frequency on the supply voltage is twice the signal frequency
No expensive DC-blocking capacitor
Good low frequency performance.
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 10. The maximum output power is limited by the supply
voltage of 18 V and the maximum available output current: 2 A repetitive peak
current.
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
Average Listening Level (ALL) - music power - without any distortion yields:
(3)
The power dissipation can be derived from Figure 12 on page 11 for 0 dB
respectively 12 dB headroom.
f
i cut
off
–
()
1
2
π 0.5 R
i
C
i
×
()
------------------------------------------
=
f
i cut
off
–
()
1
2
π 0.5 32
×
10
3
220
10
9
–
×
()
------------------------------------------------------------------------------
45.2 Hz
==
P
o ALL
()
10 W
15.85
-------------
631
=mW
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA8946AJ/N2,112 | 功能描述:音频放大器 2X15W AUDIO AMP VOL CTRL RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDA8946J | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:2 x 15 W stereo Bridge Tied Load BTL audio amplifier |
| TDA8946J/N1,112 | 功能描述:音频放大器 AUDIO AMP 2X15W RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TDA8947J | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:4-channel audio amplifier (SE: 1 W to 25 W; BTL: 4 W to 50 W) |
| TDA8947J/N3,112 | 功能描述:音频放大器 3/4 CHANNEL AUD AMP RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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