LM4752T National Semiconductor, LM4752T Datasheet

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LM4752T

Manufacturer Part Number
LM4752T
Description
Stereo 11W Audio Power Amplifier
Manufacturer
National Semiconductor
Datasheet

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© 1999 National Semiconductor Corporation
LM4752
Stereo 11W Audio Power Amplifier
General Description
The LM4752 is a stereo audio amplifier capable of delivering
11W per channel of continuous average output power to a
4
ply at 10% THD+N.
The LM4752 is specifically designed for single supply opera-
tion and a low external component count. The gain and bias
resistors are integrated on chip, resulting in a 11W stereo
amplifier in a compact 7 pin TO220 package. High output
power levels at both 20V and 24V supplies and low external
component count offer high value for compact stereo and TV
applications. A simple mute function can be implemented
with the addition of a few external components.
Key Specifications
n Output power at 10% THD+N with 1 kHz into 4
n Output power at 10% THD+N with 1 kHz into 8
n Closed loop gain 34 dB (typ)
n P
Typical Application
FIGURE 1. Typical Audio Amplifier Application Circuit
= 24V 11W (typ)
= 24V 7W (typ)
pkg. at V
load, or 7W per channel into 8
O
at 10% THD
CC
= 12V 2.5W (typ)
@
1 kHz into 4
using a single 24V sup-
Single-ended TO-263
DS100039
at V
at V
CC
CC
DS100039-1
n P
Features
n Drives 4
n Internal gain resistors (A
n Minimum external component requirement
n Single supply operation
n Internal current limiting
n Internal thermal protection
n Compact 7 lead TO-220 package
n Low cost-per-watt
Applications
n Compact stereos
n Stereo TVs
n Mini component stereos
n Multimedia speakers
Connection Diagram
at V
O
at 10% THD
CC
= 12V 5W (typ)
and 8
Order Number LM4752TS
Package Number TA07B
Package Number TS07B
Order Number LM4752T
Package Description
Package Description
@
Plastic Package
loads
1 kHz into 8
Top View
Top View
V
= 34 dB)
bridged TO-263 pkg.
DS100039-50
DS100039-2
February 1999
www.national.com

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LM4752T Summary of contents

Page 1

... Stereo TVs n Mini component stereos Multimedia speakers Connection Diagram Plastic Package Package Description Top View Order Number LM4752T Package Number TA07B DS100039-1 Package Description Top View Order Number LM4752TS Package Number TS07B February 1999 bridged TO-263 pkg. DS100039-2 DS100039-50 www.national.com ...

Page 2

... 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 Output Current Power Dissipation (Note 3) ESD Susceptability (Note 4) Junction Temperature Soldering Information T Package (10 sec) Electrical Characteristics The following specifications apply to each channel with V ...

Page 3

Test Circuit DS100039-36 FIGURE 2. Test Circuit 3 www.national.com ...

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Typical Application with Mute www.national.com FIGURE 3. Application with Mute Function 4 DS100039-3 ...

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Equivalent Schematic Diagram 5 www.national.com ...

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System Application Circuit FIGURE 4. Circuit for External Components Description External Components Description Components Provides power supply filtering and bypassing Rsn Works with Csn to stabilize the output stage from high frequency oscillations ...

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Typical Performance Characteristics THD+N vs Output Power DS100039-12 THD+N vs Output Power DS100039-6 THD+N vs Output Power DS100039-15 THD+N vs Output Power DS100039-9 THD+N vs Output Power DS100039-13 THD+N vs Output Power DS100039-7 THD+N vs Output Power DS100039-16 THD+N vs ...

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Typical Performance Characteristics THD+N vs Output Power DS100039-38 THD+N vs Output Power DS100039-41 THD+N vs Output Power DS100039-44 THD+N vs Output Power DS100039-47 www.national.com (Continued) THD+N vs Output Power DS100039-39 THD+N vs Output Power DS100039-42 THD+N vs Output Power DS100039-45 ...

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Typical Performance Characteristics Output Power vs Supply Voltage DS100039-18 THD+N vs Frequency DS100039-21 Channel Separation DS100039-24 Power Derating Curve DS100039-27 (Continued) Output Power vs Supply Voltage DS100039-19 THD+N vs Frequency DS100039-22 PSRR vs Frequency DS100039-25 Power Dissipation vs Output Power ...

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Typical Performance Characteristics Power Dissipation vs Output Power DS100039-51 Application Information CAPACITOR SELECTION AND FREQUENCY RESPONSE With the LM4752 all single supply amplifiers, AC cou- pling capacitors are used to isolate the DC voltage present at the inputs ...

Page 11

Application Information (Continued) DS100039-31 FIGURE 6. THD+N vs. P PREVENTING OSCILLATIONS With the integration of the feedback and bias resistors on- chip, the LM4752 fits into a very compact package. However, due to the close proximity of the non-inverting input ...

Page 12

Application Information put signal. An external circuit may be used to sense for the desired threshold, and pull the bias line (pin5) to ground to disable the input preamp. Figure 7 shows an example of such a circuit. When the ...

Page 13

Application Information (Continued) TO-263 HEATSINK DESIGN EXAMPLES: Example 1: (Stereo Single-Ended Output) = 30˚C Given 150˚ 12V 2˚C from Graph: DMAX D ...

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Application Information PC BOARD LAYOUT — COMPOSITE www.national.com (Continued) 14 DS100039-33 ...

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Application Information (Continued) PC BOARD LAYOUT — SILK SCREEN DS100039-34 15 www.national.com ...

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Application Information PC BOARD LAYOUT — SOLDER SIDE www.national.com (Continued) 16 DS100039-35 ...

Page 17

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM4752T NS Package Number TA07B Order Number LM4752TS NS Package Number TS7B 17 www.national.com ...

Page 18

... National Semiconductor Asia Pacific Customer Fax: +49 (0) 1 80-530 85 86 Response Group Email: europe.support@nsc.com Tel: 65-2544466 Fax: 65-2504466 Tel: +49 (0) 1 80-532 78 32 Email: sea.support@nsc.com Tel: +49 (0) 1 80-534 16 80 National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 ...

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