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LM4876

更新时间： 2024-01-18 09:50:13
品牌 Logo 应用领域
德州仪器 - TI 放大器功率放大器
页数 文件大小 规格书
19页 985K
描述
LM4876 1.1W Audio Power Amplifier with Logic Low

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LM4876 技术参数

是否Rohs认证： 符合生命周期：Transferred
包装说明：SOP, SOP8,.25Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.33.00.01
风险等级：5.1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：R-PDSO-G8JESD-609代码：e3
长度：4.9 mm湿度敏感等级：1
信道数量：1功能数量：1
端子数量：8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：SOP
封装等效代码：SOP8,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：260
电源：2.6/5 V认证状态：Not Qualified
座面最大高度：1.75 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：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：40
宽度：3.9 mmBase Number Matches：1

LM4876 数据手册

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LM4876  
SNAS054E –FEBRUARY 2000–REVISED MAY 2013  
www.ti.com  
APPLICATION INFORMATION  
BRIDGE CONFIGURATION EXPLANATION  
As shown in Figure 1, the LM4876 consists of two operational amplifiers. External resistors Rf and Ri set the  
closed-loop gain of Amp1, whereas two internal 40kΩ resistors set Amp2's gain at -1. The LM4876 drives a load,  
such as a speaker, connected between the two amplifier outputs, Vo1 and Vo2 .  
Figure 1 shows that the Amp1 output serves as the Amp2 input, which results in both amplifiers producing  
signals identical in magnitude, but 180° out of phase. Taking advantage of this phase difference, a load is placed  
between Vo1 and Vo2 and driven differentially (commonly referred to as "bridge mode"). This results in a  
differential gain of  
AVD = 2 * (Rf/Ri)  
(1)  
Bridge mode is different from single-ended amplifiers that drive loads connected between a single amplifier's  
output and ground. For a given supply voltage, bridge mode has a distinct advantage over the single-ended  
configuration: its differential output doubles the voltage swing across the load. This results in four times the  
output power when compared to a single-ended amplifier under the same conditions. This increase in attainable  
output power assumes that the amplifier is not current limited or that the output signal is not clipped. To ensure  
minimum output signal clipping when choosing an amplifier's closed-loop gain, refer to the AUDIO POWER  
AMPLIFIER DESIGN section.  
Another advantage of the differential bridge output is no net DC voltage across the load. This results from biasing  
Vo1 and Vo2 at half-supply. This eliminates the coupling capacitor that single supply, single-ended amplifiers  
require. Eliminating an output coupling capacitor in a single-ended configuration forces a single-supply amplifier's  
half-supply bias voltage across the load. The current flow created by the half-supply bias voltage increases  
internal IC power dissipation and may permanently damage loads such as speakers.  
POWER DISSIPATION  
Power dissipation is a major concern when designing a successful bridged or single-ended amplifier. Equation 2  
states the maximum power dissipation point for a single-ended amplifier operating at a given supply voltage and  
driving a specified output load.  
PDMAX = (VDD)2 /(2π2 RL) Single-Ended  
(2)  
However, a direct consequence of the increased power delivered to the load by a bridge amplifier is higher  
internal power dissipation for the same conditions.  
The LM4876 has two operational amplifiers in one package and the maximum internal power dissipation is four  
times that of a single-ended amplifier. Equation 3 states the maximum power dissipation for a bridge amplifier.  
However, even with this substantial increase in power dissipation, the LM4876 does not require heatsinking.  
From Equation 3, assuming a 5V power supply and an 8Ω load, the maximum power dissipation point is 633mW.  
PDMAX = 4*(VDD)2 /(2π2 RL ) Bridge Mode  
(3)  
The maximum power dissipation point given by Equation 3 must not exceed the power dissipation given by  
Equation 4:  
PDMAX = (TJMAX -TA) /θJA  
(4)  
The LM4876's TJMAX = 150°C. In the D package, the LM4876's θJA is 140°C/W. At any given ambient  
temperature TA, use Equation 4 to find the maximum internal power dissipation supported by the IC packaging.  
Rearranging Equation 4 results in Equation 5. This equation gives the maximum ambient temperature that still  
allows maximum power dissipation without violating the LM4876's maximum junction temperature.  
TA = TJMAX - PDMAX θJA  
(5)  
For a typical application with a 5V power supply and an 8W load, the maximum ambient temperature that allows  
maximum power dissipation without exceeding the maximum junction temperature is approximately 61°C.  
TJMAX = PDMAX θJA + TA  
(6)  
8
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Copyright © 2000–2013, Texas Instruments Incorporated  
Product Folder Links: LM4876  
 
 
 
 
 
 
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