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參數(shù)資料
| 型號： | LM4752T/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 7 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM7 |
| 封裝： | LEAD FREE, PLASTIC, TO-220, 7 PIN |
| 文件頁數(shù)： | 9/22頁 |
| 文件大?。?/td> | 521K |
| 代理商： | LM4752T/NOPB |
2 P
DMAX = 2 [V S
2
/ (2
π2 R
L) ] = (24V)
2
/ (2
π2 4) =
14.6W
θ
SA ≤ [ (TJ TA) / PDMAX] θ JC θCS = [ (150°C 55°C) /
14.6W ] 2°C/W 0.2°C/W = 4.3°C/W
Conclusion: Choose a heatsink with
θ
SA ≤ 4.3°C/W.
TO-263 Heatsink Design Examples
Example 1:
(Stereo Single-Ended Output)
Given:
T
A=30°C
T
J=150°C
R
L=4
V
S=12V
θ
JC=2°C/W
P
DMAX from PD vs PO Graph:
P
DMAX ≈ 3.7W
Calculating P
DMAX:
P
DMAX = VCC
2
/ (
π2R
L) = (12V)
2
/
π2(4)) = 3.65W
Calculating Heatsink Thermal Resistance:
θ
SA < [(T J TA) / PDMAX] θJC θCS
θ
SA < 120°C / 3.7W 2.0°C/W 0.2°C/W = 30.2°C/W
Therefore the recommendation is to use 1.5 × 1.5 square inch
of single-sided copper clad.
Example 2:
(Stereo Single-Ended Output)
Given:
T
A=50°C
T
J=150°C
R
L=4
V
S=12V
θ
JC=2°C/W
P
DMAX from PD vs PO Graph:
P
DMAX ≈ 3.7W
Calculating P
DMAX:
P
DMAX = VCC
2
/ (
π2R
L) = (12V)
2
/ (
π2(4)) = 3.65W
Calculating Heatsink Thermal Resistance:
θ
SA < [(TJ TA) / PDMAX] θJC θCS
θ
SA < 100°C / 3.7W 2.0°C/W 0.2°C/W = 24.8°C/W
Therefore the recommendation is to use 2.0 × 2.0 square inch
of single-sided copper clad.
Example 3:
(Bridged Output)
Given:
T
A=50°C
T
J=150°C
R
L=8
V
S=12V
θ
JC=2°C/W
Calculating P
DMAX:
P
DMAX = 4[VCC
2
/ (2
π2R
L)] = 4(12V)
2
/ (2
π2(8)) = 3.65W
Calculating Heatsink Thermal Resistance:
θ
SA < [(TJ TA) / PDMAX] θJC θCS
θ
SA < 100°C / 3.7W 2.0°C/W 0.2°C/W = 24.8°C/W
Therefore the recommendation is to use 2.0 × 2.0 square inch
of single-sided copper clad.
Layout and Ground Returns
Proper PC board layout is essential for good circuit perfor-
mance. When laying out a PC board for an audio power
amplifer, particular attention must be paid to the routing of the
output signal ground returns relative to the input signal and
bias capacitor grounds. To prevent any ground loops, the
ground returns for the output signals should be routed sepa-
rately and brought together at the supply ground. The input
signal grounds and the bias capacitor ground line should also
be routed separately. The 0.1
μF high frequency supply by-
pass capacitor should be placed as close as possible to the
IC.
17
www.national.com
LM4752
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| LM4755MDC | 11 W, 2 CHANNEL, AUDIO AMPLIFIER, UUC |
| LM4766MDC | 40 W, 2 CHANNEL, AUDIO AMPLIFIER, UUC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4752TS | 功能描述:音頻放大器 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 |
| LM4752TS/NOPB | 功能描述:音頻放大器 STEREO 11W AUDIO PWR AMP 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 |
| LM4753 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual 10W Audio Power Amplifier w/Mute, Standby and Volume Control |
| LM4753T | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LM4755 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 11W Audio Power Amplifier with Mute |
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