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LM4876MM/NOPB

更新时间： 2024-01-13 03:15:51
品牌 Logo 应用领域
美国国家半导体 - NSC 放大器光电二极管商用集成电路
页数 文件大小 规格书
12页 312K
描述
IC 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO10, MSOP-10, Audio/Video Amplifier

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LM4876MM/NOPB 技术参数

是否Rohs认证： 符合生命周期：Transferred
包装说明：TSSOP, TSSOP10,.19,20Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.33.00.01
风险等级：5.04标称带宽：20 kHz
商用集成电路类型：AUDIO AMPLIFIER谐波失真：0.5%
JESD-30 代码：S-PDSO-G10JESD-609代码：e3
长度：3 mm湿度敏感等级：1
信道数量：1功能数量：1
端子数量：10最高工作温度：85 °C
最低工作温度：-40 °C标称输出功率：1.5 W
封装主体材料：PLASTIC/EPOXY封装代码：TSSOP
封装等效代码：TSSOP10,.19,20封装形状：SQUARE
封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH峰值回流温度（摄氏度）：260
电源：2/5.5 V认证状态：Not Qualified
座面最大高度：1.1 mm子类别：Audio/Video Amplifiers
最大压摆率：10 mA最大供电电压 (Vsup)：5.5 V
最小供电电压 (Vsup)：2 V表面贴装：YES
温度等级：INDUSTRIAL端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：0.5 mm
端子位置：DUAL处于峰值回流温度下的最长时间：40
宽度：3 mmBase Number Matches：1

LM4876MM/NOPB 数据手册

 浏览型号LM4876MM/NOPB的Datasheet PDF文件第6页浏览型号LM4876MM/NOPB的Datasheet PDF文件第7页浏览型号LM4876MM/NOPB的Datasheet PDF文件第8页浏览型号LM4876MM/NOPB的Datasheet PDF文件第9页浏览型号LM4876MM/NOPB的Datasheet PDF文件第11页浏览型号LM4876MM/NOPB的Datasheet PDF文件第12页 
Application Information (Continued)  
AUDIO POWER AMPLIFIER DESIGN  
(10)  
Thus, a minimum gain of 2.83 allows the LM4876’s to reach  
full output swing and maintain low noise and THD+N perfor-  
mance. For this example, let AVD = 3.  
Audio Amplifier Design: Driving 1W into an 8Ω Load  
The following are the desired operational parameters:  
The amplifier’s overall gain is set using the input (Ri) and  
feedback (Rf) resistors. With the desired input impedance  
set at 20kΩ, the feedback resistor is found using Equation  
(11).  
Power Output  
Load Impedance  
Input Level  
1WRMS  
8Ω  
1VRMS  
Input Impedance  
Bandwidth  
20kΩ  
Rf/Ri = AVD/2  
(11)  
100Hz–20kHz 0.25dB  
The value of Rf is 30kΩ.  
The last step in this design example is setting the amplifier’s  
-3dB low frequency bandwidth. To achieve the desired  
0.25dB pass band magnitude variation limit, the low fre-  
quency response must extend to at least one-fifth the lower  
bandwidth limit and the high frequency response must ex-  
tend to at least five times the upper bandwidth limit. The  
results is an  
The design begins by specifying the minimum supply voltage  
necessary to obtain the specified output power. One way to  
find the minimum supply voltage is to use the Output Power  
vs Supply Voltage curve in the Typical Performance Char-  
acteristics section. Another way, using Equation (8), is to  
calculate the peak output voltage necessary to achieve the  
desired output power for a given load impedance. To ac-  
count for the amplifier’s dropout voltage, two additional volt-  
ages, based on the Dropout Voltage vs Supply Voltage in the  
Typical Performance Characteristics curves, must be  
added to the result obtained by Equation (8). This results in  
Equation (9).  
fL = 100 Hz/5 = 20Hz  
and an  
FH = 20 kHz*5 = 100kHz  
As mentioned in the External Components section, Ri and Ci  
create a highpass filter that sets the amplifier’s lower band-  
pass frequency limit. Find the coupling capacitor’s value  
using Equation (12).  
(8)  
Ci ≥ 1/(2πRifL)  
(12)  
VCC ≥ (VOUTPEAK + (VOD  
+ VODBOT))  
(9)  
TOP  
The result is  
1/(2π*20kΩ*20Hz) = 0.398µF.  
Use a 0.39µF capacitor, the closest standard value.  
The Output Power vs Supply Voltage graph for an 8Ω load  
indicates a minimum supply voltage of 4.6V. This is easily  
met by the commonly used 5V supply voltage. The additional  
voltage creates the benefit of headroom, allowing the  
LM4876 to produce peak output power in excess of 1W  
without clipping or other audible distortion. The choice of  
supply voltage must also not create a violation of maximum  
power dissipation as explained above in the Power Dissi-  
pation section.  
The product of the desired high frequency cutoff (100kHz in  
this example) and the differential gain, AVD, determines the  
upper passband response limit. With AVD = 3 and fH  
=
100kHz, the closed-loop gain bandwidth product (GBWP) is  
150kHz. This is less than the LM4876’s 4MHz GBWP. With  
this margin, the amplifier can be used in designs that require  
more differential gain and avoid performance-restricting  
bandwidth limitations.  
After satisfying the LM4876’s power dissipation require-  
ments, the minimum differential gain is found using Equation  
(10).  
www.national.com  
10  
1...789101112

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