LM4755TS National Semiconductor, LM4755TS Datasheet

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LM4755TS

Manufacturer Part Number
LM4755TS
Description
IC,Audio Amplifier,DUAL,BIPOLAR,SIP,9PIN,PLASTIC
Manufacturer
National Semiconductor
Datasheet

Specifications of LM4755TS

Operational Class
Class-AB
Audio Amplifier Output Configuration
2-Channel Stereo
Output Power (typ)
11x2@4OhmW
Audio Amplifier Function
Speaker
Total Harmonic Distortion
0.08@8Ohm@2W%
Single Supply Voltage (typ)
12/15/18/24/28V
Dual Supply Voltage (typ)
Not RequiredV
Power Supply Requirement
Single
Power Dissipation
62.5W
Rail/rail I/o Type
No
Power Supply Rejection Ratio
50dB
Single Supply Voltage (min)
9V
Single Supply Voltage (max)
32V
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
9 +Tab
Package Type
TO-263
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM4755TSX/NOPB
Manufacturer:
SUPERTEX
Quantity:
659
© 2008 National Semiconductor Corporation
LM4755
Stereo 11W Audio Power Amplifier with Mute
General Description
The LM4755 is a stereo audio amplifier capable of delivering
11W per channel of continuous average output power to a
4Ω load or 7W per channel into 8Ω using a single 24V supply
at 10% THD+N. The internal mute circuit and pre-set gain re-
sistors provide for a very economical design solution.
Output power specifications at both 20V and 24V supplies
and low external component count offer high value to con-
sumer electronic manufacturers for stereo TV and compact
stereo applications. The LM4755 is specifically designed for
single supply operation.
Key Specifications
Typical Application
Output power at 10% THD with 1kHz into 4Ω at
V
Output power at 10% THD with 1kHz into 8Ω at
V
Closed loop gain: 34dB (typ)
P
package at V
CC
CC
O
at 10% THD+N @ 1kHz into 4Ω single-ended TO-263
= 24V: 11W (typ)
= 24V: 7W (typ)
CC
=12V: 2.5W (typ)
FIGURE 1. Typical Audio Amplifier Application Circuit
100059
Features
Applications
P
package at V
Drives 4Ω and 8Ω loads
Integrated mute function
Internal Gain Resistors
Minimal external components needed
Single supply operation
Internal current limiting and thermal protection
Compact 9-lead TO-220 package
Wide supply range 9V - 40V
Stereos TVs
Compact stereos
Mini component stereos
O
at 10% THD+N @ 1kHz into 8Ω bridged TO-263
CC
=12V: 5W (typ)
10005901
www.national.com
May 14, 2008

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LM4755TS Summary of contents

Page 1

... P at 10% THD+N @ 1kHz into 4Ω single-ended TO-263 O package at V =12V: 2.5W (typ) CC Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit © 2008 National Semiconductor Corporation ■ 10% THD+N @ 1kHz into 8Ω bridged TO-263 O package at V Features ■ Drives 4Ω and 8Ω loads ■ ...

Page 2

... Connection Diagrams www.national.com Plastic Package 10005902 Package Description Top View Order Number LM4755T Package Number TA09A 10005936 Top View Order Number LM4755TS Package Number TS9A 2 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Input Voltage Input Voltage at Output Pins (Note 8) Output Current Power Dissipation (Note 3) ESD Susceptibility (Note 4) Junction Temperature Electrical Characteristics ...

Page 4

Note 1: All voltages are measured with respect to the GND pin (5), unless otherwse 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 ...

Page 5

Equivalent Schematic 5 www.national.com ...

Page 6

Test Circuit www.national.com FIGURE 2. Test Circuit 6 10005904 ...

Page 7

System Application Circuit FIGURE 3. Circuit for External Components Description External Components Description Components Provides power supply filtering and bypassing Works with C to stabilize the output stage from high frequency oscillations. SN ...

Page 8

Typical Performance Characteristics THD+N vs Output Power THD+N vs Output Power THD+N vs Output Power www.national.com (Note 5) THD+N vs Output Power 10005912 THD+N vs Output Power 10005914 THD+N vs Output Power 10005907 8 10005913 10005906 10005908 ...

Page 9

THD+N vs Output Power 10005915 THD+N vs Output Power 10005917 THD+N vs Output Power 10005910 THD+N vs Output Power THD+N vs Output Power THD+N vs Output Power 9 10005916 10005909 10005911 www.national.com ...

Page 10

THD+N vs Output Power THD+N vs Output Power THD+N vs Output Power www.national.com THD+N vs Output Power 10005938 THD+N vs Output Power 10005940 THD+N vs Output Power 10005942 10 10005939 10005941 10005943 ...

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THD+N vs Output Power 10005944 THD+N vs Output Power 10005946 THD+N vs Output Power 10005948 THD+N vs Output Power THD+N vs Output Power THD+N vs Output Power 11 10005945 10005947 10005949 www.national.com ...

Page 12

Output Power vs Supply Voltage Frequency Response THD+N vs Frequency www.national.com Output Power vs Supply Voltage 10005918 THD+N vs Frequency 10005920 Frequency Response 10005922 12 10005919 10005921 10005923 ...

Page 13

Channel Separation 10005924 Supply Current vs Supply Voltage 10005926 Power Dissipation vs Output Power 10005928 PSRR vs Frequency Power Derating Curve Power Dissipation vs Output Power 13 10005925 10005927 10005929 www.national.com ...

Page 14

Power Dissipation vs Output Power Application Information The LM4755 contains circuitry to pull down the bias line in- ternally, effectively shutting down the input stage. An external R-C should be used to adjust the timing of the pull-down. If the ...

Page 15

FIGURE 4. Bridge-Mode Application 10005931 FIGURE 5. THD for Bridge-Mode Application OUT 15 10005930 10005937 www.national.com ...

Page 16

PREVENTING OSCILLATIONS With the integration of the feedback and bias resistors on- chip, the LM4755 fits into a very compact package. However, due to the close proximity of the non-inverting input pins to the corresponding output pins, the inputs should ...

Page 17

The above values for θ vary widely due to dimensional pro- SA portions (i.e. variations in width and length will vary θ For audio applications, where peak power levels are short in duration, this part will perform satisfactory with less ...

Page 18

PC BOARD LAYOUT-COMPOSITE www.national.com 18 10005933 ...

Page 19

PC BOARD LAYOUT-SILK SCREEN 19 10005934 www.national.com ...

Page 20

PC BOARD LAYOUT-SOLDER SIDE www.national.com 20 10005935 ...

Page 21

Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM4755T NS Package Number TA9A 21 www.national.com ...

Page 22

... Order Number LM4755TS NS Package Number TS9A 22 ...

Page 23

Notes 23 www.national.com ...

Page 24

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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