National Semiconductor LM4952 Technical data
LM4952
3.1W Stereo-SE Audio Power Amplifier
with DC Volume Control
August 2004
LM4952 3.1W Stereo-SE Stereo Audio Power Amplifier
with DC Volume Control
General Description
The LM4952 is a dual audio power amplifier primarily designed for demanding applications in flat panel monitors and
TV’s. It is capable of delivering 3.1 watts per channel to a 4Ω
single-ended load with less than 1% THD+N when powered
by a 12V
Eliminating external feedback resistors, an internal, DCcontrolled, volume control allows easy and variable gain
adjustment.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4952 does not require bootstrap capacitors or snubber circuits. Therefore, it is ideally
suited for display applications requiring high power and minimal size.
The LM4952 features a low-power consumption active-low
shutdown mode. Additionally, the LM4952 features an internal thermal shutdown protection mechanism along with short
circuit protection.
The LM4952 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
power supply.
DC
Connection Diagram
Key Specifications
j
Quiscent Power Supply Current 18mA (typ)
j
P
OUT
VDD= 12V, RL=4Ω, 10% THD+N 3.8W (typ)
j
Shutdown current 55µA (typ)
Features
n Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
n Low current, active-low shutdown mode
n Low quiescent current
n Stereo 3.8W output, R
n DC-controlled volume control
n Short circuit protection
L
=4Ω
Applications
n Flat Panel Monitors
n Flat panel TV’s
n Computer Sound Cards
Top View
Order Number LM4952TS
See NS Package Number TS9A
U = Wafer Fab Code
Z = Assembly Plant Code
XY = Date Coce
TT = Die Traceability
L4952TS = LM4952TS
Boomer®is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200809 www.national.com
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Typical Application
LM4952
FIGURE 1. Typical LM4952 SE Audio Amplifier Application Circuit
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LM4952
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (pin 6, referenced
to GND, pins 4 and 5) 18.0V
Storage Temperature −65˚C to +150˚C
Input Voltage
pins 4, 6, and 7 −0.3V to V
pins 1, 2, 3, 8, and 9 −0.3V to 9.5V
Power Dissipation (Note 3) Internally limited
DD
+ 0.3V
ESD Susceptibility (Note 5) 200V
Junction Temperature 150˚C
Thermal Resistance
θ
(TS) 4˚C/W
JC
θ
(TS) (Note 3) 20˚C/W
JA
Operating Ratings
Temperature Range
T
≤ TA≤ T
MIN
MAX
Supply Voltage 9.6V ≤ V
−40˚C ≤ TA≤ 85˚C
≤ 16V
DD
ESD Susceptibility (Note 4) 2000V
Electrical Characteristics VDD= 12V (Notes 1, 2)
The following specifications apply for VDD= 12V, AV= 20dB (nominal), RL=4Ω, and TA= 25˚C unless otherwise noted.
Symbol Parameter Conditions LM4952 Units
Typical
(Note 6)
I
DD
I
SD
R
IN
V
IN
V
SDIH
V
SDIL
T
WU
Quiescent Power Supply Current VIN= 0V, IO= 0A, No Load 18 35 mA (max)
Shutdown Current V
Amplifier Input Resistance V
SHUTDOWN
DC VOL=VDD
V
DC VOL
= GND (Note 9) 55 85 µA (max)
/2 44 kΩ
= GND 200 kΩ
Amplifier Input Signal VDD/2 V
Shutdown Voltage Input High 2.0
Shutdown Voltage Input Low 0.4 V (max)
Wake-up Time CB= 4.7µF 440 ms
Limit
(Notes 7, 8)
V
DD
TSD Thermal Shutdown Temperature 170 ˚C
P
O
THD+N Total Harmomic Distortion + Noise P
e
OS
X
TALK
Output Power f = 1kHz,
THD+N = 1%
THD+N = 10%
= 2.0Wrms, f = 1kHz 0.08 %
O
Output Noise A-Weighted Filter, VIN= 0V,
Input Referred
Channel Separation fIN= 1kHz, PO= 1W,
3.1
2.8 W (min)
3.8
8µV
Input Referred
78
72 dB
89 80 dB (min)
PSRR Power Supply Rejection Ratio V
I
OL
Output Current Limit VIN= 0V, RL= 500mΩ 5A
=8Ω
R
L
=4Ω
R
L
= 200mV
RIPPLE
Input Referred
, f = 1kHz,
p-p
(Limits)
p-p
V (min)
/2
V (max)
(max)
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Electrical Characteristics for Volume Control (Notes 1, 2)
The following specifications apply for VDD= 12V, AV= 20dB (nominal), and TA= 25˚C unless otherwise noted.
LM4952
LM4952
Symbol Parameter Conditions
VOL
VOL
A
M
Note 1: All voltages are measured with respect to the GND pin, unless otherwise 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
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC andAC electrical specifications under particular test conditions which
guarantee 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: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation is P
in Figure 1) with V
area.
Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 5: Machine Model, 220pF–240pF discharged through all pins.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: Shutdown current is measured in a normal room environment. The Shutdown pin should be driven as close as possible to GND for minimum shutdown
current.
Gain V
max
Gain V
min
Mute Attenuation V
=(T
DMAX
= 12V, RL=4Ω stereo operation the total power dissipation is 3.65W. θJA= 20˚C/W for the TO263 package mounted to 16in2heatsink surface
DD
JMAX−TA
= Full scale, No Load 20 dB
DC-VOL
= +1LSB, No Load -46 dB
DC-VOL
= 0V, No Load 75 63 dB (min)
DC-VOL
, θJA, and the ambient temperature, TA. The maximum
)/θJAor the given in Absolute Maximum Ratings, whichever is lower. For the LM4952 typical application (shown
JMAX
Typical
(Note 6)
Limit
(Note 7)
External Components Description Refer to Figure 1
Units
(Limits)
Components Functional Description
This is the input coupling capacitor. It blocks DC voltage at the amplifier’s inverting input. CINand R
1. C
IN
create a highpass filter. The filter’s cutoff frequency is fC=1/(2πRINCIN). Refer to the SELECTING
EXTERNAL COMPONENTS, for an explanation of determining C
2. C
S
The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about
properly placing, and selecting the value of, this capacitor.
This capacitor filters the half-supply voltage present on the BYPASS pin. Refer to the Application section,
3. C
BYPASS
SELECTING EXTERNAL COMPONENTS, for information about properly placing, and selecting the value
of, this capacitor.
’s value.
IN
IN
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LM4952
Typical Performance Characteristics A
THD+N vs Frequency THD+N vs Frequency
VDD= 12V, RL=4Ω,
= 2W, CIN= 1.0µF
P
OUT
THD+N vs Output Power THD+N vs Output Power
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= 20dB and TA= 25˚C, unless otherwise noted.
V
VDD= 12V, RL=8Ω,
= 1W, CIN= 1.0µF
P
OUT
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VDD= 12V, RL=4Ω,
= 1kHz
f
IN
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VDD= 12V, RL=8Ω,
= 1kHz
f
IN
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Typical Performance Characteristics A
(Continued)
LM4952
Output Power vs Power Supply Voltage Output Power vs Power Supply Voltage
= 20dB and TA= 25˚C, unless otherwise noted.
V
RL=4Ω,fIN= 1kHz
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both channels driven and loaded (average shown),
at (from top to bottom at 12V):
both channels driven and loaded (average shown),
RL=8Ω,fIN= 1kHz
at (from top to bottom at 12V):
THD+N = 10%, THD+N = 1%
THD+N = 10%, THD+N = 1%
Power Supply Rejection vs Frequency Total Power Dissipation vs Load Dissipation
VDD= 12V, fIN= 1kHz,
at (from top to bottom at 1W):
=4Ω,RL=8Ω
R
L
VDD= 12V, RL=4Ω,
RIPPLE
= 200mV
p-p
V
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Output Power vs Load Resistance Channel-to-Channel Crosstalk vs Frequency
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VDD= 12V, fIN= 1kHz,
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at (from top to bottom at 15Ω):
THD+N = 10%, THD+N = 1%
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VDD= 12V, RL=4Ω,P
= 1W, Input Referred
OUT
at (from top to bottom at 1kHz): V
V
OUTA
measured, V
driven, V
INA
OUTB
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driven,
INB
measured
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