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參數資料
| 型號： | TDA8946 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 運動控制電子 |
| 英文描述： | 2 x 15 W stereo Bridge Tied Load BTL audio amplifier |
| 中文描述： | 2 x 15瓦的立體聲橋接負載橋接音頻放大器 |
| 文件頁數： | 5/23頁 |
| 文件大?。?/td> | 393K |
| 代理商： | TDA8946 |
Philips Semiconductors
TDA8946J
2 x 15 W stereo BTL audio amplifier
Product specification
Rev. 02 — 14 March 2000
5 of 23
9397 750 06863
Philips Electronics N.V. 2000. All rights reserved.
8.2 Power amplifier
The power amplifier is a Bridge Tied Load (BTL) amplifier 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 8
. The maximum output power is limited by the maximum
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
distortion. At V
CC
= 18 V, R
L
= 8
and P
o
= 10 W at THD = 0.1% (see
Figure 6
), the
Average Listening Level (ALL) – music power – without any distortion yields:
P
o(ALL)
= 10 W/15.85 = 631 mW.
The power dissipation can be derived from
Figure 11 on page 11
for 0 dB
respectively 12 dB headroom.
For the average listening level a power dissipation of 8 W can be used for a heatsink
calculation.
8.3 Mode selection
The TDA8946J has three functional modes, which can be selected by applying the
proper DC voltage to pin MODE. See
Figure 4
and
5
for the respective DC levels,
which depend on the supply voltage level. The MODE pin can be driven by a 3-state
logic output stage: e.g. a microcontroller with additional components for DC-level
shifting.
Standby —
In this mode the current consumption is very low and the outputs are
floating. The device is in standby mode when (V
CC
0.5 V) < V
MODE
< V
CC
, or when
the MODE pin is left floating (high impedance). The power consumption of the
TDA8946J will be reduced to <0.18 mW.
Table 4:
Headroom
0 dB
12 dB
Power rating as function of headroom
Power output (THD = 0.1%)
P
o
= 10 W
P
o(ALL)
= 631 mW
Power dissipation (P)
18 W
8 W
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TDA8946AJ | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 x 15 W BTL audio amplifier with DC gain control |
| TDA8946AJ/N2,112 | 功能描述:音頻放大器 2X15W AUDIO AMP VOL CTRL RoHS:否 制造商:STMicroelectronics 產品: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 |
| TDA8946J | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2 x 15 W stereo Bridge Tied Load BTL audio amplifier |
| TDA8946J/N1,112 | 功能描述:音頻放大器 AUDIO AMP 2X15W RoHS:否 制造商:STMicroelectronics 產品: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 |
| TDA8947J | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:4-channel audio amplifier (SE: 1 W to 25 W; BTL: 4 W to 50 W) |
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