NSC LM4752T Datasheet
LM4752
Stereo 11W Audio Power Amplifier
n P
at 10%THD@1 kHz into 8Ω bridged TO-263 pkg.
General Description
The LM4752 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 LM4752 is specifically designed for single supply operation 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 highvalueforcompactstereoandTV
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 4Ω at V
= 24V 11W (typ)
n Output power at 10%THD+N with 1 kHz into 8Ω at V
= 24V 7W (typ)
n Closed loop gain 34 dB (typ)
n P
at 10%THD@1 kHz into 4Ω Single-ended TO-263
O
pkg. at V
=
12V 2.5W (typ)
CC
CC
CC
O
at V
CC
Features
n Drives 4Ω and 8Ω loads
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
=
12V 5W (typ)
=34dB)
V
LM4752 Stereo 11W Audio Power Amplifier
February 1999
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
© 1999 National Semiconductor Corporation DS100039 www.national.com
Package Description
Top View
Order Number LM4752TS
Package Number TS07B
DS100039-50
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage 40V
Input Voltage
Output Current Internally Limited
Power Dissipation (Note 3) 62.5W
±
0.7V
Storage Temperature −40˚C to 150˚C
Operating Ratings
Temperature Range
≤ TA≤ T
T
MIN
MAX
Supply Voltage 9V to 32V
θ
JC
θ
JA
−40˚C ≤ TA≤ +85˚C
2˚C/W
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 VCC= 24V, TA= 25˚C unless otherwise specified.
Symbol Parameter Conditions
I
total
P
o
Total Quiescent Power Supply
Current
V
= 0V, Vo= 0V, RL=
INAC
Output Power (Continuous f = 1 kHz, THD+N = 10%,RL=8Ω 7W
Average per Channel) f = 1 kHz, THD+N = 10%,R
V
= 20V, RL=8Ω 4W
CC
V
= 20V, RL=4Ω 7W
CC
f = 1 kHz, THD+N = 10%,R
= 12V, TO-263 Pkg.
V
THD+N Total Harmonic Distortion plus
Noise
V
OSW
X
talk
Output Swing RL=8Ω,VCC= 20V 15 V
Channel Separation See
PSRR Power Supply Rejection Ratio See
V
ODV
Differential DC Output Offset
Voltage
S
f = 1 kHz, P
R
=4Ω,VCC= 20V 14 V
L
= 1 W/ch, RL=8Ω 0.08
o
Figure 1
f = 1 kHz, V
= 4 Vrms, RL=8Ω
o
Figure 1
V
= 22V to 26V, RL=8Ω
CC
V
= 0V 0.09 0.4 V(max)
INAC
∞
=4Ω 10 W(min)
L
=4Ω
L
Typical
(Note 5)
Limit
(Note 6)
10.5 20 mA(max)
7 mA(min)
2.5 W
55 dB
50 dB
SR Slew Rate 2 V/µs
LM4752
R
IN
PBW Power Bandwidth 3 dB BW at P
A
VCL
Input Impedance 83 kΩ
= 2.5W, RL=8Ω 65 kHz
o
Closed Loop Gain (Internally Set) RL=8Ω 34 33 dB(min)
35 dB(max)
e
in
Noise IHF-A Weighting Filter, RL=8Ω 0.2 mVrms
Output Referred
I
o
Note 1: All voltages are measured with respect to the GND pin (4), unless otherwise specified.
Note 2:
tional, but do not guarantee specificperformance limits.
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
θ
JC
Note 4: Human body model, 100 pF discharged through a 1.5 kΩ 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
Output Short Circuit Current Limit VIN= 0.5V, RL=2Ω 2 A(min)
Absolute Maximum Ratings
= 2˚C/W (junction to case). Refer to the section Determining the Maximum Power Dissipation in the Application Information section for more information.
indicate limits beyondwhich damage to the device may occur.
Electrical Characteristics
>
16V due to impractical heatsinking limitations.
S
state DC and AC electrical specifications underparticular test conditions which guar-
Operating Ratings
indicate conditions forwhich the device is func-
Units
(Limits)
%
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Test Circuit
DS100039-36
FIGURE 2. Test Circuit
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Typical Application with Mute
FIGURE 3. Application with Mute Function
DS100039-3
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Equivalent Schematic Diagram
DS100039-4
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System Application Circuit
FIGURE 4. Circuit for External Components Description
External Components Description
DS100039-5
Components Function Description
1, 2 Cs Provides power supply filtering and bypassing.
3, 4 Rsn Works with Csn to stabilize the output stage from high frequency oscillations.
5, 6 Csn Works with Rsn to stabilize the output stage from high frequency oscillations.
7 Cb Provides filtering for the internally generated half-supply bias generator.
8, 9 Ci Input AC coupling capacitor which blocks DC voltage at the amplifier’s input terminals.
10, 11 Co Output AC coupling capacitor which blocks DC voltage at the amplifier’s output terminal.
12, 13 Ri Voltage control - limits the voltage level to the amplifier’s input terminals.
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Also creates a high pass filter with fc=1/(2
Creates a high pass filter with fc=1/(2
•π•
Rin•Cin).
•π•
Rout•Cout).
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