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LM4752 Stereo 11W Audio Power Amplifier
August 2000
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 W load, or 7W per channel into 8 W using a single 24V sup-
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.
n P O at 10% THD+N @ 1kHz into 8
W
bridged TO-263
package at V CC = 12V: 5W (typ)
loads
n Internal gain resistors (A V =34dB)
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
n Wide supply range 9V - 40V
W
and 8
W
Key Specifications
n Output power at 10% THD+N with 1kHz into 4 W at
V CC = 24V: 11W (typ)
n Output power at 10% THD+N with 1kHz into 8
W
at
Applications
n Compact stereos
n Stereo TVs
n Mini component stereos
n Multimedia speakers
V CC = 24V: 7W (typ)
n Closed loop gain: 34dB (typ)
n P O at 10% THD+N @ 1 kHz into 4
single-ended
TO-263 package at V CC = 12V: 2.5W (typ)
W
Typical Application
Connection Diagram
Plastic Package
DS100039-2
Package Description
Top View
Order Number LM4752T
Package Number TA07B
DS100039-1
FIGURE 1. Typical Audio Amplifier Application Circuit
DS100039-50
Package Description
Top View
Order Number LM4752TS
Package Number TS07B
© 2000 National Semiconductor Corporation
DS100039
www.national.com
Features
n Drives 4
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Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature
−40˚C to 150˚C
Operating Ratings
Temperature Range
T MIN
Supply Voltage
40V
£
T A
£
T MAX
−40˚C
£
T A
£
+85˚C
Input Voltage
± 0.7V
Supply Voltage
9V to 32V
Output Current
Internally Limited
q
JC
2˚C/W
Power Dissipation (Note 3)
62.5W
q JA
79˚C/W
ESD Susceptability (Note 4)
2 kV
Junction Temperature
150˚C
Soldering Information
T Package (10 sec)
250˚C
Electrical Characteristics
The following specifications apply to each channel with V CC = 24V, T A = 25˚C unless otherwise specified.
LM4752
Units
(Limits)
Symbol
Parameter
Conditions
Typical
(Note 5)
Limit
(Note 6)
I total
Total Quiescent Power Supply
Current
V INAC = 0V, V o = 0V, R L =
¥
10.5
20
mA(max)
7
mA(min)
P o
Output Power (Continuous
f = 1 kHz, THD+N = 10%, R L =8
W
7
W
Average per Channel)
f = 1 kHz, THD+N = 10%, R L =4
W
10
W(min)
V CC = 20V, R L =8
W
4
W
V CC = 20V, R L =4
W
7
W
f = 1 kHz, THD+N = 10%, R L =4 W
V S = 12V, TO-263 Pkg.
2.5
W
THD+N
Total Harmonic Distortion plus
Noise
f = 1 kHz, P o = 1 W/ch, R L =8
W
0.08
%
V OSW
Output Swing
R L =8
W
,V CC = 20V
15
V
R L =4
W
,V CC = 20V
14
V
X talk
Channel Separation
See Figure 1
55
dB
f = 1 kHz, V o = 4 Vrms, R L =8
W
PSRR
Power Supply Rejection Ratio
See Figure 1
50
dB
V CC = 22V to 26V, R L =8
W
V ODV
Differential DC Output Offset
Voltage
V INAC = 0V
0.09
0.4
V(max)
SR
Slew Rate
2
V/µs
R IN
Input Impedance
83
k W
PBW
Power Bandwidth
3 dB BW at P o = 2.5W, R L =8
W
65
kHz
A VCL
Closed Loop Gain (Internally Set)
R L =8
W
34
33
dB(min)
35
dB(max)
e in
Noise
IHF-A Weighting Filter, R L =8
W
0.2
mVrms
Output Referred
I o
Output Short Circuit Current Limit
V IN = 0.5V, R L =2
W
2
A(min)
Note 1: All voltages are measured with respect to the GND pin (4), unless otherwise specified.
Note 2: AbsoluteMaximumRatingsindicate limits beyond which damage to the device may occur. OperatingRatingsindicate conditions for which the device is func-
tional, but do not guarantee specific performance limits. ElectricalCharacteristicsstate DC and AC electrical specifications under particular test conditions which guar-
antee 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: For operating at case temperatures above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance of
q JC = 2˚C/W (junction to case). Refer to the section Determining the Maximum Power Dissipation in the Application Information section for more information.
Note 4: Human body model, 100 pF discharged through a 1.5 k
W
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2
resistor.
Note 5: Typicals are measured at 25˚C and represent the parametric norm.
Note 6: Limits are guarantees that all parts are tested in production to meet the stated values.
Note 7: The TO-263 Package is not recommended for V S > 16V due to impractical heatsinking limitations.
29276473.003.png
Test Circuit
DS100039-36
FIGURE 2. Test Circuit
3
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29276473.004.png
Typical Application with Mute
DS100039-3
FIGURE 3. Application with Mute Function
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4
29276473.005.png
Equivalent Schematic Diagram
5
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29276473.001.png

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