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參數(shù)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(fù)載橋接音頻放大器 |
| 文件頁數(shù)： | 16/23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
16 of 23
9397 750 06863
Philips Electronics N.V. 2000. All rights reserved.
14.2 Thermal behaviour and heatsink calculation
The measured maximum thermal resistance of the IC package, R
th(j-mb)
is 4.5 K/W.
A calculation for the heatsink can be made, with the following parameters:
T
amb(max)
= 50
°
C
V
CC
= 18 V and R
L
= 8
T
j(max)
= 150
°
C.
R
th(tot)
is the total thermal resistance between the junction and the ambient
including the heatsink. In the heatsink calculations the value of R
th(mb-h)
is ignored.
At V
CC
= 12 V and R
L
= 8
the measured worst-case sine-wave dissipation is 18 W;
see
Figure 11
. For T
j(max)
= 150
°
C the temperature raise - caused by the power
dissipation - is: 150 – 50 = 100
°
C.
P
×
R
th(tot)
= 100
°
C
R
th(tot)
= 100/18 = 5.56 K/W
R
th(h-a)
= R
th(tot)
– R
th(j-mb)
= 5.56 – 4.5 = 1.06 K/W.
The calculation above is for an application at worst-case (stereo) sine-wave output
signals. In practice music signals will be applied, which decreases the maximum
power dissipation to approximately half of the sine-wave power dissipation (see
Section 8.2.2
). This allows for the use of a smaller heatsink:
P
×
R
th(tot)
= 100
°
C
R
th(tot)
= 100/8 = 12.5 K/W
R
th(h-a)
= R
th(tot)
– R
th(j-mb)
= 12.5 – 4.5 = 8.0 K/W.
To increase the lifetime of the IC, T
j(max)
should be reduced to 125
°
C. This requires a
heatsink of approximately 4 K/W for music signals.
15. Test information
15.1 Quality information
The General Quality Specification for Integrated Circuits, SNW-FQ-611Dis
applicable.
15.2 Test conditions
T
amb
= 25
°
C; V
CC
= 18 V; f = 1 kHz; R
L
= 8
; audio pass band 22 Hz to 22 kHz;
unless otherwise specified.
Remark:
In the graphs as function of frequency no bandpass filter was applied; see
Figure 7
,
12
and
13
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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(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 |
| 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(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 |
| 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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