Electronic Components Datasheet Search
Selected language     English  ▼
Part Name
         Description


LM4954 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM4954
Description  HIgh Voltage 3 Watt Audio Power Amplifier
Download  16 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo 

 
 5 page
background image
Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature TA. The maximum
allowable power dissipation is PDMAX =(TJMAX –TA)/ θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4954, see power
derating curves for additional information.
Note 4: Human body model, 100pF discharged through a 1.5k
Ω resistor.
Note 5: Machine Model, 220pF – 240pF discharged through all pins.
Note 6: Typical specifications are specified at 25˚C and represent the parametric norm.
Note 7: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: Shutdown current is measured in a normal room environment. Exposure to direct sunlight in the TL package will increase ISD by a minimum of 2µA.
Note 10: All bumps have the same thermal resistance and contribute equally when used to lower thermal resistance. The
θJA in the Thermal Resistance section
is for the ITL package without any heat spreading planes on the PCB.
Note 11: The demo board shown has 1.1in2 (710mm2) heat spreading planes on the two internal layers and the bottom layer. The bottom internal layer is electrically
VDD while the top internal and bottom layers are electrically GND. Thermal performance for the demo board is found on the Power Derating graph in the Typical
Performance Characteristics section. 7V operation requires heat spreading planes for the thermal stability.
External Components Description
(Figure 1)
Components
Functional Description
1.
R
i
Inverting input resistance which sets the closed-loop gain in conjunction with R
f. This resistor also forms a
high pass filter with C
i at fC = 1/(2
π R
iCi).
2.
C
i
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a
highpass filter with R
i at fc = 1/(2
π R
iCi). Refer to the section, Proper Selection of External Components,
for an explanation of how to determine the value of C
i.
3.
R
f
Feedback resistance which sets the closed-loop gain in conjunction with R
i.AVD =2*(Rf/Ri).
4.
C
S
Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing
section for information concerning proper placement and selection of the supply bypass capacitor.
5.
C
B
Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of External
Components, for information concerning proper placement and selection of C
B.
www.national.com
5




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16 


Datasheet Download



Related Electronics Part Number

Part NumberComponents DescriptionHtml ViewManufacturer
LM4804Low Voltage High Power Audio Power Amplifier 1 2 3 4 5 MoreNational Semiconductor (TI)
NJM2113LOW VOLTAGE AUDIO POWER AMPLIFIER 1 2 3 4 New Japan Radio
UTCLM386LOW VOLTAGE AUDIO POWER AMPLIFIER 1 2 Unisonic Technologies
HWD21901 Watt Audio Power Amplifier 1 2 3 4 5 MoreList of Unclassifed Manufacturers
LM49272.5 Watt Fully Differential Audio Power Amplifier With Shutdown 1 2 3 4 5 MoreNational Semiconductor (TI)
MJE170Low Power Audio Amplifier Low Current High Speed Switching Applications 1 2 3 4 5 Fairchild Semiconductor
NJM2135LOW VOLTAGE AUDIO POWER AMPLIFIER 1 2 3 4 5 New Japan Radio
NTE180Silicon Power Transistor High Power Audio Amplifier 1 2 NTE Electronics
NTE7088Integrated Circuit Audio Power Amplifier 18 Watt BTL x 2 Channel 1 2 3 NTE Electronics

Link URL

Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Bookmark   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com 2003 - 2017    


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl