Texas Instruments LM4952TS Schematics
LM4952
www.ti.com
SNAS230A –AUGUST 2004–REVISED MAY 2013
LM4952 Boomer™ Audio Power Amplifier Series 3.1W Stereo-SE Audio Power Amplifier
with DC Volume Control
Check for Samples: LM4952
1
FEATURES
23
• Pop & Click Circuitry Eliminates Noise During
Turn-on and Turn-off Transitions
• Low Current, Active-low Shutdown Mode
• Low Quiescent Current
• Stereo 3.8W Output, RL= 4Ω
• DC-controlled Volume Control
• Short Circuit Protection
APPLICATIONS
• Flat Panel Monitors
• Flat Panel TV's
• Computer Sound Cards
KEY SPECIFICATIONS
• Quiscent Power Supply Current 18mA (typ)
• P
• Shutdown current 55μA (typ)
@
OUT
VDD= 12V, RL = 4Ω, 10% THD+N 3.8W (typ)
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 12VDCpower
supply.
Eliminating external feedback resistors, an internal,
DC-controlled, 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.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2Boomer is a trademark of Texas Instruments Incorporated.
3All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2013, Texas Instruments Incorporated
SHUTDOWN
CONTROL
AUDIO
INPUT A
AUDIO
INPUT B
4.7 PF
0.39 PF
0.39 PF
BIAS
VOLUME
VOLUME
BYPASS
SHUTDOWN
2
3
9
8
V
DD
6
5
4:
7
1
0V - 3.3V
470 PF
DC-VOL
+
-
DC-
CONTROLLED
VOLUME
CONTROL
+
-
470 PF
4:
4
COUT
A
COUT
B
CIN
A
C
BYPAS
S
CIN
B
-VIN
A
-VIN
B
R
L
R
L
AMP
B
AMP
A
C
S
VOUT
B
VOUT
A
10 PF
-V
IN
A
SHUTDOWN
V
OUT
A
DC VOL
GND
V
DD
V
OUT
B
BYPASS
-V
IN
B
L
4952TS
UZXYTT
LM4952
SNAS230A –AUGUST 2004–REVISED MAY 2013
Connection Diagram
Typical Application
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Figure 1. DDPAK – Top View
See Package Number KTW
L4952TS = LM4952TS
2 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Figure 2. Typical LM4952 SE Audio Amplifier Application Circuit
Product Folder Links: LM4952
LM4952
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Absolute Maximum Ratings
(1)(2)(3)
SNAS230A –AUGUST 2004–REVISED MAY 2013
Supply Voltage (pin 6, referenced to GND, pins 4 and 5) 18.0V
Storage Temperature −65°C to +150°C
pins 4, 6, and 7 −0.3V to VDD+ 0.3V
Input Voltage pins 1, 2, 3, 8, and 9 −0.3V to 9.5V
Power Dissipation
ESD Susceptibility
ESD Susceptibility
(4)
(5)
(6)
Internally limited
2000V
200V
Junction Temperature 150°C
θ
(TS) 4°C/W
JC
Thermal Resistance θJA(TS)
(4)
20°C/W
(1) All voltages are measured with respect to the GND pin, unless otherwise specified.
(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 specify specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which specify specific performance limits. This assumes that the device is within the
Operating Ratings. Specifications are not specified for parameters where no limit is given, however, the typical value is a good indication
of device performance.
(3) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(4) The maximum power dissipation must be derated at elevated temperatures and is dictated by T
TA. The maximum allowable power dissipation is P
lower. For the LM4952 typical application (shown in Figure 2) with VDD= 12V, RL= 4Ω stereo operation the total power dissipation is
DMAX
= (T
− TA) / θJAor the given in Absolute Maximum Ratings, whichever is
JMAX
, θJA, and the ambient temperature,
JMAX
3.65W. θJA= 20°C/W for the DDPAK package mounted to 16in2heatsink surface area.
(5) Human body model, 100pF discharged through a 1.5kΩ resistor.
(6) Machine Model, 220pF–240pF discharged through all pins.
Operating Ratings
Temperature Range T
Supply Voltage 9.6V ≤ VDD≤ 16V
Electrical Characteristics VDD= 12V
(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
I
DD
I
SD
R
IN
V
IN
V
SDIH
V
SDIL
T
WU
TSD Thermal Shutdown Temperature 170 °C
P
O
(1) All voltages are measured with respect to the GND pin, unless otherwise specified.
(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 specify specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which specify specific performance limits. This assumes that the device is within the
Operating Ratings. Specifications are not specified for parameters where no limit is given, however, the typical value is a good indication
of device performance.
(3) Typicals are measured at 25°C and represent the parametric norm.
(4) Limits are ensured to AOQL (Average Outgoing Quality Level).
(5) Datasheet min/max specification limits are ensured by design, test, or statistical analysis.
(6) 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.
Copyright © 2004–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Quiescent Power Supply Current VIN= 0V, IO= 0A, No Load 18 35 mA (max)
Shutdown Current V
Amplifier Input Resistance V
Amplifier Input Signal VDD/2 V
Shutdown Voltage Input High 2.0 V (min)
Shutdown Voltage Input Low 0.4 V (max)
Wake-up Time CB= 4.7µF 440 ms
Output Power f = 1kHz,
≤ TA≤ T
MIN
SHUTDOWN
DC VOL
V
DC VOL
MAX
(3)
Typical
(6)
= GND
55 85 µA (max)
= VDD/2 44 kΩ
= GND 200 kΩ
−40°C ≤ TA≤ 85°C
(4)(5)
Limit
VDD/2 V (max)
THD+N = 1% 3.1 2.8 W (min)
THD+N = 10% 3.8
Product Folder Links: LM4952
(Limits)
(max)
p-p
LM4952
SNAS230A –AUGUST 2004–REVISED MAY 2013
Electrical Characteristics VDD= 12V
(1)(2)
(continued)
www.ti.com
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
(3)
Limit
(4)(5)
THD+N Total Harmomic Distortion + Noise PO= 2.0Wrms, f = 1kHz 0.08 %
ε
X
OS
TALK
Output Noise A-Weighted Filter, VIN= 0V,
Input Referred
Channel Separation fIN= 1kHz, PO= 1W,
Input Referred
8 µV
RL= 8Ω 78
RL= 4Ω 72 dB
PSRR Power Supply Rejection Ratio V
I
OL
Output Current Limit VIN= 0V, RL= 500mΩ 5 A
Electrical Characteristics for Volume Control
= 200mV
RIPPLE
Input Referred
(1)(2)
, f = 1kHz,
p-p
89 80 dB (min)
(Limits)
The following specifications apply for VDD= 12V, AV= 20dB (nominal), and TA= 25°C unless otherwise noted.
Symbol Parameter Conditions
VOL
VOL
A
M
Gain V
max
Gain V
min
Mute Attenuation V
= Full scale, No Load 20 dB
DC-VOL
= +1LSB, No Load -46 dB
DC-VOL
= 0V, No Load 75 63 dB (min)
DC-VOL
Typical
LM4952
(3)
Limit
(4)
(Limits)
Units
(1) All voltages are measured with respect to the GND pin, unless otherwise specified.
(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 specify specific performance limits. Electrical Characteristics state DC and AC electrical
specifications under particular test conditions which specify specific performance limits. This assumes that the device is within the
Operating Ratings. Specifications are not specified for parameters where no limit is given, however, the typical value is a good indication
of device performance.
(3) Typicals are measured at 25°C and represent the parametric norm.
(4) Limits are ensured to AOQL (Average Outgoing Quality Level).
External Components Description
Refer to Figure 2.
Components Functional Description
1. C
2. C
3. C
IN
S
BYPASS
This is the input coupling capacitor. It blocks DC voltage at the amplifier's inverting input. CINand RINcreate a
highpass filter. The filter's cutoff frequency is fC= 1/(2πRINCIN). Refer to SELECTING EXTERNAL COMPONENTS,
for an explanation of determining CIN's value.
The supply bypass capacitor. Refer to POWER SUPPLY BYPASSING 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 SELECTING EXTERNAL
COMPONENTS for information about properly placing, and selecting the value of, this capacitor.
4 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated
Product Folder Links: LM4952
6
OUTPUT POWER (W)
0.01
0.1
1
10
THD
+N (%)
0.02
0.2
2
0.05
0.5
5
10m 100m 120m 200m50m 500m 2 5
6
OUTPUT POWER (W)
0.01
0.1
1
10
THD+N (%)
0.02
0.2
2
0.05
0.5
5
10m 100m 120m 200m50m 500m 2 5
20
100 1k 20k
FREQUENCY (Hz)
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10
THD
+N (%)
10k
200 2k500 5k
50
20
100 1k 20k
FREQUENCY (Hz)
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10
THD
+N (%)
10k
200 2k500 5k
50
LM4952
www.ti.com
Typical Performance Characteristics
AV= 20dB and TA= 25°C, unless otherwise noted.
THD+N vs Frequency THD+N vs Frequency
VDD= 12V, RL= 4Ω, VDD= 12V, RL= 8Ω,
P
= 2W, CIN= 1.0µF P
OUT
Figure 3. Figure 4.
THD+N vs Output Power THD+N vs Output Power
= 1W, CIN= 1.0µF
OUT
SNAS230A –AUGUST 2004–REVISED MAY 2013
VDD= 12V, RL= 4Ω, VDD= 12V, RL= 8Ω,
fIN= 1kHz fIN= 1kHz
RL= 4Ω, fIN= 1kHz
both channels driven and loaded (average shown),
at (from top to bottom at 12V):
THD+N = 10%, THD+N = 1%
Copyright © 2004–2013, Texas Instruments Incorporated Submit Documentation Feedback 5
Figure 5. Figure 6.
Output Power vs Power Supply Voltage Output Power vs Power Supply Voltage
RL= 8Ω, fIN= 1kHz
both channels driven and loaded (average shown),
at (from top to bottom at 12V):
THD+N = 10%, THD+N = 1%
Figure 7. Figure 8.
Product Folder Links: LM4952
-0 +1 +2 +4 +5
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
AMPLIFIER GAIN (dB)
DC VOLUME VOLTAGE (V)
+3+0.5 +1.5 +2.5 +4.5+3.5
20 20k
FREQUENCY (Hz)
50 100 200 500 10k1k 2k 5k
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
+0
AMPLITUDE (dB)
20 20k
FREQUENCY (Hz)
50 100 200 500 10k1k 2k 5k
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
+0
AMPLITUDE (dB)
20 20k
FREQUENCY (Hz)
-100
+0
MAGNITUDE (dB)
10k1k 2k 5k50 100 200 500
-90
-80
-70
-60
-50
-40
-30
-20
-10
-95
-85
-75
-65
-55
-45
-35
-25
-15
-5
LM4952
SNAS230A –AUGUST 2004–REVISED MAY 2013
Typical Performance Characteristics (continued)
AV= 20dB and TA= 25°C, unless otherwise noted.
Power Supply Rejection vs Frequency Total Power Dissipation vs Load Dissipation
VDD= 12V, RL= 4Ω,
V
= 200mV
RIPPLE
p-p
Figure 9. Figure 10.
Output Power vs Load Resistance Channel-to-Channel Crosstalk vs Frequency
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VDD= 12V, fIN= 1kHz,
at (from top to bottom at 1W):
RL= 4Ω, RL= 8Ω
VDD= 12V, fIN= 1kHz,
at (from top to bottom at 15Ω):
THD+N = 10%, THD+N = 1%
VDD= 12V, RL= 8Ω, P
at (from top to bottom at 1kHz): V
V
measured, V
OUTA
6 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated
VDD= 12V, RL= 4Ω, P
at (from top to bottom at 1kHz): V
V
measured, V
OUTA
= 1W, Input Referred
OUT
driven, V
INA
INB
OUTB
driven,
measured
Figure 11. Figure 12.
Channel-to-Channel Crosstalk vs Frequency Amplifier Gain vs DC Volume Voltage
= 1W, Input Referred
INA
OUT
driven, V
driven,
INB
measured
OUTB
Figure 13. Figure 14.
VDD= 12V, RL= 8Ω, at (from top to bottom at 1.5V):
Decreasing DC Volume Voltage, Increasing DC Volume Voltage
Product Folder Links: LM4952
6
OUTPUT POWER (W)
0.01
0.1
1
10
THD+N (%)
0.02
0.2
2
0.05
0.5
5
10m 100m 120m 200m50m 500m 2 5
6
OUTPUT POWER (W)
0.01
0.1
1
10
THD+N (%)
0.02
0.2
2
0.05
0.5
5
10m 100m 120m 200m50m 500m 2 5
20
100 1k 20k
FREQUENCY (Hz)
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10
THD
+N (%)
10k
200 2k500 5k
50
-0 +1 +2 +4 +5
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
AMPLIFIER GAIN (dB)
DC VOLUME VOLTAGE (V)
+3+0.5 +1.5 +2.5 +4.5+3.5
20
100 1k 20k
FREQUENCY (Hz)
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10
THD
+N (%)
10k
200 2k500 5k
50
LM4952
www.ti.com
Typical Performance Characteristics (continued)
AV= 20dB and TA= 25°C, unless otherwise noted.
Amplifier Gain vs Part-to-Part DC Volume Voltage
VDD= 12V, RL= 8Ω,
Variation (Five parts) THD+N vs Frequency
Figure 15. Figure 16.
THD+N vs Frequency THD+N vs Output Power
VDD= 9.6V, RL= 4Ω,
P
= 1.1W, CIN= 1.0µF
OUT
SNAS230A –AUGUST 2004–REVISED MAY 2013
VDD= 9.6V, RL= 8Ω,
P
= 850mW, CIN= 1.0µF
OUT
VDD= 9.6V, RL= 8Ω,
fIN= 1kHz
Copyright © 2004–2013, Texas Instruments Incorporated Submit Documentation Feedback 7
VDD= 9.6V, RL= 4Ω,
fIN= 1kHz
Figure 17. Figure 18.
THD+N vs Output Power Total Power Dissipation vs Load Dissipation
VDD= 9.6V, fIN= 1kHz
at (from top to bottom at 1W):
RL= 4Ω, RL= 8Ω
Figure 19. Figure 20.
Product Folder Links: LM4952
20
100 1k 20k
FREQUENCY (Hz)
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10
THD
+N (%)
10k
200 2k500 5k
50
20
100 1k 20k
FREQUENCY (Hz)
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10
THD
+N (%)
10k
200 2k500 5k
50
20 20k
FREQUENCY (Hz)
50 100 200 500 10k1k 2k 5k
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
+0
AMPLITUDE (dB)
20 20k
FREQUENCY (Hz)
50 100 200 500 10k1k 2k 5k
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
+0
AMPLITUDE (dB)
20 20k
FREQUENCY (Hz)
-100
+0
MAGNITUDE (dB)
10k1k 2k 5k50 100 200 500
-90
-80
-70
-60
-50
-40
-30
-20
-10
-95
-85
-75
-65
-55
-45
-35
-25
-15
-5
LM4952
SNAS230A –AUGUST 2004–REVISED MAY 2013
Typical Performance Characteristics (continued)
AV= 20dB and TA= 25°C, unless otherwise noted.
Output Power vs Load Resistance Power Supply Rejection vs Frequency
VDD= 9.6V, fIN= 1kHz,
at (from top to bottom at 15Ω):
THD+N = 10%, THD+N = 1%
Figure 21. Figure 22.
Channel-to Channel Crosstalk vs Frequency Channel-to Channel Crosstalk vs Frequency
VDD= 9.6V, RL= 4Ω,
V
= 200mV
RIPPLE
P-P
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VDD= 9.6V, RL= 4Ω, P
at (from top to bottom at 1kHz): V
driven, V
VDD= 14V, RL= 4Ω, VDD= 14V, RL= 8Ω,
P
OUT
8 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated
measured driven, V
OUTB
= 2W, CIN= 1.0µF P
= 1W, Input Referred VDD= 9.6V, RL= 8Ω, P
OUT
driven, V
INB
Figure 23. Figure 24.
OUTA
measured; V
at (from top to bottom at 1kHz): V
INA
OUTB
measured
= 1W, Input Referred
OUT
INB
THD+N vs Frequency THD+N vs Frequency
= 1W, CIN= 1.0µF
Figure 25. Figure 26.
OUT
Product Folder Links: LM4952
driven, V
OUTA
measured; V
INA
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