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参数资料
| 型号： | LM4752MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 7 W, 2 CHANNEL, AUDIO AMPLIFIER, UUC |
| 封装： | WAFER |
| 文件页数： | 5/21页 |
| 文件大小： | 732K |
| 代理商： | LM4752MWC |
Application Information (Continued)
TO-263 HEATSINK DESIGN EXAMPLES:
Example 1: (Stereo Single-Ended Output)
Given:
T
A=30C
T
J=150C
R
L=4
V
S=12V
θ
JC=2C/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 < 120C / 3.7W 2.0C/W 0.2C/W = 30.2C/W
Therefore the recommendation is to use 1.5 x 1.5 square
inch of single-sided copper clad.
Example 2: (Stereo Single-Ended Output)
Given:
T
A=50C
T
J=150C
R
L=4
V
S=12V
θ
JC=2C/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 < 100C / 3.7W 2.0C/W 0.2C/W = 24.8C/W
Therefore the recommendation is to use 2.0 x 2.0 square
inch of single-sided copper clad.
Example 3: (Bridged Output)
Given:
T
A=50C
T
J=150C
R
L=8
V
S=12V
θ
JC=2C/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 < 100C / 3.7W 2.0C/W 0.2C/W = 24.8C/W
Therefore the recommendation is to use 2.0 x 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 am-
plifer, 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 F high frequency supply
bypass capacitor should be placed as close as possible to
the IC.
LM4752
www.national.com
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4752T | 制造商:National Semiconductor Corporation 功能描述: 制造商:Texas Instruments 功能描述: |
| LM4752T/NOPB | 功能描述:IC AMP AUDIO PWR 11W AB TO220-7 RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) |
| LM4752T/NOPB | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC |
| LM4752TS | 功能描述:音频放大器 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 |
| LM4752TS/NOPB | 功能描述:音频放大器 STEREO 11W AUDIO PWR 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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