LM4766T/LF15 National Semiconductor, LM4766T/LF15 Datasheet

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LM4766T/LF15

Manufacturer Part Number
LM4766T/LF15
Description
2X40W AUDIO AMP FOR PC & HOME
Manufacturer
National Semiconductor
Datasheet

Specifications of LM4766T/LF15

Operational Class
Class-AB
Audio Amplifier Output Configuration
2-Channel Stereo
Output Power (typ)
40x2@8OhmW
Audio Amplifier Function
Speaker
Input Offset Voltage
10@±30VmV
Total Harmonic Distortion
0.06@8Ohm@30W%
Single Supply Voltage (typ)
18V
Dual Supply Voltage (typ)
±12/±15/±24/±28V
Power Supply Requirement
Single/Dual
Power Dissipation
62.5W
Unity Gain Bandwidth Product (typ)
8MHz
Rail/rail I/o Type
No
Power Supply Rejection Ratio
125dB
Single Supply Voltage (min)
20V
Single Supply Voltage (max)
60V
Dual Supply Voltage (min)
±10V
Dual Supply Voltage (max)
±30V
Operating Temp Range
-20C to 85C
Operating Temperature Classification
Commercial
Mounting
Through Hole
Pin Count
15 +Tab
Lead Free Status / Rohs Status
Compliant
© 2006 National Semiconductor Corporation
LM4766 Overture
Audio Power Amplifier Series Dual 40W Audio Power
Amplifier with Mute
General Description
The LM4766 is a stereo audio amplifier capable of delivering
typically 40W per channel with the non-isolated "T" package
and 30W per channel with the isolated "TF" package of
continuous average output power into an 8Ω load with less
than 0.1% (THD+N).
The performance of the LM4766, utilizing its Self Peak In-
stantaneous Temperature (˚Ke) (SPiKe
cuitry, places it in a class above discrete and hybrid amplifi-
ers by providing an inherently, dynamically protected Safe
Operating Area (SOA). SPiKe Protection means that these
parts are safeguarded at the output against overvoltage,
undervoltage, overloads, including thermal runaway and in-
stantaneous temperature peaks.
Each amplifier within the LM4766 has an independent
smooth transition fade-in/out mute that minimizes output
pops. The IC’s extremely low noise floor at 2µV and its
extremely low THD+N value of 0.06% at the rated power
make the LM4766 optimum for high-end stereo TVs or mini-
component systems.
Connection Diagram
SPiKe
Protection and Overture
are trademarks of National Semiconductor Corporation.
DS100928
) Protection Cir-
See NS Package Number TA15A
See NS Package Number TF15B
Non-Isolated TO-220 Package
Order Number LM4766TF
Isolated TO-220 Package
Order Number LM4766T
Plastic Package
Top View
Key Specifications
Features
n SPiKe Protection
n Minimal amount of external components necessary
n Quiet fade-in/out mute mode
n Non-Isolated 15-lead TO-220 package
n Wide Supply Range 20V - 78V
Applications
n High-end stereo TVs
n Component stereo
n Compact stereo
j
j
average output power into 8Ω
output power of 2 x 30W into 8Ω
THD+N at 1kHz at 2 x 30W continuous
THD+N at 1kHz at continuous average
10092802
0.009% (typ)
www.national.com
0.1% (max)
March 2006

Related parts for LM4766T/LF15

LM4766T/LF15 Summary of contents

Page 1

... LM4766 optimum for high-end stereo TVs or mini- component systems. Connection Diagram SPiKe ™ Protection and Overture ™ are trademarks of National Semiconductor Corporation. © 2006 National Semiconductor Corporation Key Specifications j THD+N at 1kHz 30W continuous average output power into 8Ω j THD+N at 1kHz at continuous average output power 30W into 8Ω ...

Page 2

Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Note: Numbers in parentheses represent pinout for amplifier B. *Optional component dependent upon specific design requirements. www.national.com 10092801 2 ...

Page 3

... Absolute Maximum Ratings 5) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage | (No Input) Supply Voltage | (with Input) Common Mode Input Voltage Differential Input Voltage Output Current Power Dissipation (Note 6) ESD Susceptability (Note 7) ...

Page 4

Electrical Characteristics The following specifications apply for V its apply for T = 25˚C. A Symbol Parameter PSRR Power Supply Rejection Ratio (Note 2) CMRR Common Mode Rejection Ratio V (Note 2) A Open Loop Voltage Gain VOL (Note 2) ...

Page 5

Test Circuit #1 (Note 2) (DC Electrical Test Circuit) Test Circuit #2 (Note 3) (AC Electrical Test Circuit) 10092804 5 10092803 www.national.com ...

Page 6

Bridged Amplifier Application Circuit www.national.com FIGURE 2. Bridged Amplifier Application Circuit 6 10092805 ...

Page 7

Single Supply Application Circuit FIGURE 3. Single Supply Amplifier Application Circuit Note: *Optional components dependent upon specific design requirements. Auxiliary Amplifier Application Circuit FIGURE 4. Special Audio Amplifier Application Circuit 10092806 10092807 7 www.national.com ...

Page 8

Equivalent Schematic (excluding active protection circuitry) www.national.com LM4766 (One Channel Only) 8 10092808 ...

Page 9

External Components Description Components 1 R Prevents currents from entering the amplifier’s non-inverting input which may be passed through to the load B upon power down of the system due to the low input impedance of the circuitry when the ...

Page 10

Typical Performance Characteristics THD+N vs Frequency THD+N vs Output Power THD+N vs Distribution www.national.com THD+N vs Frequency 10092855 THD+N vs Output Power 10092858 THD+N vs Distribution 10092872 10 10092856 10092857 10092873 ...

Page 11

Typical Performance Characteristics Channel Separation vs Frequency Output Power vs Load Resustance Power Dissipation vs Output Power (Continued) 10092810 10092874 10092876 11 Clipping Voltage vs Supply Voltage 10092868 Output Power vs Supply Voltage 10092878 Power Dissipation vs Output Power 10092877 ...

Page 12

Typical Performance Characteristics Note: The maximum heatsink thermal resistance values, θ the table above were calculated using a θ SA 0.2˚C/W due to thermal compound. Safe Area Pulse Power Limit www.national.com (Continued) Max Heatsink Thermal Resistance (˚C/W) at ...

Page 13

Typical Performance Characteristics Pulse Response Power Supply Rejection Ratio Open Loop Frequency Response (Continued) Large Signal Response 10092866 10092888 10092890 13 10092887 Common-Mode Rejection Ratio 10092889 Supply Current vs Case Temperature 10092865 www.national.com ...

Page 14

Typical Performance Characteristics Input Bias Current vs Case Temperature Mute Attenuation vs Mute Current (per Amplifier) Output Power/Channel vs Supply Voltage f = 1kHz 6Ω, 80kHz BW L www.national.com (Continued) Mute Current (per Amplifier) 10092867 Output Power/Channel f ...

Page 15

Application Information MUTE MODE The muting function of the LM4766 allows the user to mute the music going into the amplifier by drawing more than 0.5mA out of each mute pin on the device. This is accom- plished as shown ...

Page 16

Application Information Again it must be noted that the value of θ upon the system designer’s amplifier requirements. If the ambient temperature that the audio amplifier working under is higher than 25˚C, then the thermal resistance for ...

Page 17

Application Information AUDIO POWER AMPLlFIER DESIGN Design a 30W/8Ω Audio Amplifier Given: Power Output Load Impedance Input Level Input Impedance Bandwidth A designer must first determine the power supply require- ments in terms of both voltage and current needed to ...

Page 18

Physical Dimensions unless otherwise noted www.national.com inches (millimeters) Non-Isolated TO-220 15-Lead Package Order Number LM4766T NS Package Number TA15A 18 ...

Page 19

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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