January 4, 2008
LME49811 Audio Power Amplifier Series
High Fidelity 200 Volt Power Amplifier Input Stage with
Shutdown
LME49811 High Fidelity 200 Volt Power Amplifier Input Stage with Shutdown
General Description
The LME49811 is a high fidelity audio power amplifier input
stage designed for demanding consumer and pro-audio applications. Amplifier output power may be scaled by changing
the supply voltage and number of output devices. The
LME49811 is capable of driving an output stage to deliver in
excess of 500 watts single-ended into an 8 ohm load in the
presence of 10% high line headroom and 20% supply regulation.
The LME49811 includes thermal shut down circuitry that activates when the die temperature exceeds 150°C. The
LME49811's shutdown function when activated, forces the
LME49811 into shutdown state.
Typical Application
Key Specifications
■ Wide operating voltage range ±20V to ±100V
■ PSRR (f = DC) 115dB (typ)
■ THD+N (f = 1kHz) 0.00035% (typ)
■ Output Drive Current 9mA
Features
Very high voltage operation
■
Scalable output power
■
Minimum external components
■
External compensation
■
Thermal Shutdown
■
Applications
Powered subwoofers
■
Pro audio
■
Powered studio monitors
■
Audio video receivers
■
Guitar Amplifiers
■
High voltage industrial applications
■
FIGURE 1. Typical Audio Amplifier Application Circuit
Overture® is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation 300048 www.national.com
30004862
LME49811
Typical Audio Amplifier Application Circuit
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Connection Diagram
LME49811
Top View
30004860
See Order Number LME49811TB
NS = National Logo
U = Fabrication plant code
Z = Assembly plant code
XY = 2 Digit date code
TT = Die traceability
TB = Package code
Pin Description
Pin Pin Name Description
1 NC No Connect, Pin electrically isolated
2 SD Shutdown Control
3 GND Device Ground
4 IN+ Non-Inverting Input
5 IN- Inverting Input
6 Comp External Compensation Connection
7 NC No Connect, Pin electrically isolated
8 NC No Connect, Pin electrically isolated
9 NC No Connect, Pin electrically isolated
10 -V
EE
Negative Power Supply
11 NC No Connect, Pin electrically isolated
12 NC No Connect, Pin electrically isolated
13 Sink Output Sink
14 Source Output Source
15 +V
CC
Positive Power Supply
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
LME49811
Distributors for availability and specifications.
Supply Voltage |V+| + |V-|
200V
T Package (10 seconds) 260°C
Storage Temperature -40°C to +150°C
Thermal Resistance
θ
JA
θ
JC
Differential Input Voltage +/-6V
Common Mode Input Range 0.4 VEE to 0.4 V
CC
Power Dissipation (Note 3) 4W
ESD Rating(Note 4) 2kV
ESD Rating (Note 5) 200V
Junction Temperature (T
JMAX
) (Note 8)
150°C
Operating Ratings (Notes 1, 2)
Temperature Range
T
≤ TA ≤ T
MIN
MAX
Supply Voltage |V+| + |V-|
−40°C ≤ TA ≤ +85°C
+/-20V ≤ V
TOTAL
≤ +/-100V
Soldering Information
Electrical Characteristics +VCC = -VEE = 50V (Notes 1, 2)
The following specifications apply for ISD = 1.5mA, Figure 1, unless otherwise specified. Limits apply for TA = 25°C, CC = 30pF.
Symbol Parameter Conditions LME49811 Units
Typical Limit
(Note 6) (Note 7)
I
CC
I
EE
THD+N
A
V
A
V
V
OM
V
NOISE
I
OUT
I
SD
Total Quiescent Power Supply
Current
Total Quiescent Power Supply
Current
Total Harmonic Distortion +
Noise
Closed Loop Voltage Gain 26 dB (min)
Open Loop Gain
Output Voltage Swing THD+N = 0.05%, Freq = 20Hz to 20kHz 33 V
Output Noise
Output Current Outputs Shorted 8 6.5 mA(min)
Current into Shutdown Pin To put part in “play” mode 1.5
SR Slew Rate
V
OS
I
B
Input Offset Voltage VCM = 0V, IO = 0mA 1 3 mV (max)
Input Bias Current VCM = 0V, IO = 0mA
PSRR Power Supply Rejection Ratio DC, Input Referred 115 105 dB (min)
VCM = 0V, VO = 0V, IO = 0A
VCM = 0V, VO = 0V, IO = 0A
No load, AV = 29dB
V
= 20V
OUT
VIN = 1mV
RMS
, f = 1kHz
RMS
, f = 1kHz
14 17 mA (max)
16 19 mA (max)
0.00055 0.0015 % (max)
93 dB
f = DC 120 dB
LPF = 30kHz, Av = 29dB
100
A-weighted 70 180
1
2
VIN = 1.2V
Outputs shorted
, f = 10kHz square Wave,
P-P
16 13
100 nA
73°C/W
4°C/W
(Limits)
RMS
μV
μV (max)
mA(min)
mA (max)
V/μs (min)
Electrical Characteristics +VCC = –VEE = 100V (Notes 1, 2)
The following specifications apply for ISD = 1.5mA, Figure 1, unless otherwise specified. Limits apply for TA = 25°C.
Symbol Parameter Conditions LME49811 Units
Typical Limit
(Note 6) (Note 7)
I
CC
I
EE
THD+N
A
V
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Total Quiescent Power Supply
Current
Total Quiescent Power Supply
Current
Total Harmonic Distortion +
Noise
VCM = 0V, VO = 0V, IO = 0A
VCM = 0V, VO = 0V, IO = 0A
No load, AV = 30dB
V
OUT
= 30V
, f = 1kHz
RMS
17 22 mA (max)
19 24 mA (max)
0.00035 0.001 % (max)
Closed Loop Voltage Gain 26 dB (min)
(Limits)
Symbol Parameter Conditions LME49811 Units
Typical Limit
(Limits)
(Note 6) (Note 7)
A
V
V
I
OUT
I
SD
V
OM
NOISE
Open Loop Gain
Output Voltage Swing THD+N = 0.05%, Freq = 20Hz to 20kHz 68 V
Output Noise
Output Current Outputs Shorted 9 7 mA(min)
Current into Shutdown Pin To put part in “play” mode 1.5
SR Slew Rate
V
OS
I
B
Input Offset Voltage VCM = 0V, IO = 0mA 1 3 mV (max)
Input Bias Current VCM = 0V, IO = 0mA
VIN = 1mV
f = DC 120 dB
LPF = 30kHz, Av = 29dB 100
A-weighted 70 180
VIN = 1.2V
Outputs shorted
, f = 1kHz 93 dB
RMS
1
2
, f = 10kHz square Wave,
P-P
17 14
100 nA (max)
RMS
μV
μV (max)
mA(min)
mA (max)
V/μs (min)
PSRR Power Supply Rejection Ratio f = DC, Input Referred 115 105 dB (min)
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability
and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in
the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the
device should not be operated beyond such conditions. All voltages are measured with respect to the ground pin, unless otherwise specified
Note 2: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified
or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed.
Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation is P
Note 4: Human body model, applicable std. JESD22-A114C.
Note 5: Machine model, applicable std. JESD22-A115-A.
Note 6: Typical values represent most likely parametric norms at TA = +25ºC, and at the Recommended Operation Conditions at the time of product
characterization and are not guaranteed.
Note 7: Datasheet min/max specification limits are guaranteed by test or statistical analysis.
Note 8: The maximum operating junction temperature is 150°C.
Note 9: The Data taken with Bandwidth = 30kHz, AV = 29dB, CC = 30pF, and TA = 25°C except where specified.
DMAX
= (T
- TA) / θJA or the number given in Absolute Maximum Ratings, whichever is lower.
JMAX
, θJA, and the ambient temperature, TA. The maximum
JMAX
LME49811
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Typical Performance Characteristics for LME49811 (Note 9)
LME49811
THD+N vs Frequency
+VCC = –VEE = 100V, VO = 14V
THD+N vs Frequency
+VCC = –VEE = 50V, VO = 10V
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THD+N vs Frequency
+VCC = –VEE = 100V, VO = 30V
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THD+N vs Frequency
+VCC = –VEE = 50V, VO = 20V
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THD+N vs Frequency
+VCC = –VEE = 20V, VO = 5V
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30004872
THD+N vs Frequency
+VCC = –VEE = 20V, VO = 10V
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