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LM4941 Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce LM4941
Description  1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown
Download  21 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM4941 Fiches technique(HTML) 11 Page - Texas Instruments

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LM4941, LM4941SDBD, LM4941TMBD
www.ti.com
SNAS347C – JUNE 2006 – REVISED MAY 2013
When using DC coupled inputs, special care must be taken to match the values of the input resistors (Ri1 and
Ri2) to each other. Because of the balanced nature of differential amplifiers, resistor matching differences can
result in net DC currents across the load. This DC current can increase power consumption, internal IC power
dissipation, reduce PSRR, and possibly damaging the loudspeaker. The chart below demonstrates this problem
by showing the effects of differing values between the feedback resistors while assuming that the input resistors
are perfectly matched. The results below apply to the application circuit shown in Figure 1, and assumes that VDD
= 5V, RL = 8Ω, and the system has DC coupled inputs tied to ground.
Tolerance
Ri1
Ri2
V01–V02
ILOAD
20%
0.8R
1.2R
–0.500V
62.5mA
10%
0.9R
1.1R
–0.250V
31.25mA
5%
0.95R
1.05R
–0.125V
15.63mA
1%
0.99R
1.01R
–0.025V
3.125mA
0%
R
R
0
0
Since the same variations can have a significant effect on PSRR and CMRR performance, it is highly
recommended that the input resistors be matched to 1% tolerance or better for best performance.
Recommended TM Board Layout
Figure 21. Recommended TM Board Layout: Top
Figure 22. Recommended TM Board Layout: Top
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Copyright © 2006–2013, Texas Instruments Incorporated
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Product Folder Links: LM4941 LM4941SDBD LM4941TMBD


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