NSC LME49811TB, LME49811 Datasheet

January 4, 2008

LME49811 Audio Power Amplifier Series
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.

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

Typical Application

30004862

FIGURE 1. Typical Audio Amplifier Application Circuit

Overture® is a registered trademark of National Semiconductor Corporation.

© 2008 National Semiconductor Corporation 300048 www.national.com

LME49811 High Fidelity 200 Volt Power Amplifier Input Stage with Shutdown

30004862

Typical Audio Amplifier Application Circuit

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LME49811

Connection Diagram

30004860

Top View

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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LME49811

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage |V+| + |V-|

200V
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

Soldering Information

T Package (10 seconds) 260°C
Storage Temperature -40°C to +150°C
Thermal Resistance

 θ

JA

73°C/W

 θ

JC

4°C/W

Operating Ratings (Notes 1, 2)

Temperature Range

T

MIN

≤ TA ≤ T

MAX

−40°C ≤ TA ≤ +85°C

Supply Voltage |V+| + |V-|

+/-20V ≤ V

TOTAL

≤ +/-100V

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

(Limits)

Typical Limit

(Note 6) (Note 7)

I

CC

Total Quiescent Power Supply
Current

VCM = 0V, VO = 0V, IO = 0A

14 17 mA (max)

I

EE

Total Quiescent Power Supply
Current

VCM = 0V, VO = 0V, IO = 0A

16 19 mA (max)

THD+N

Total Harmonic Distortion +
Noise

No load, AV = 29dB
V

OUT

= 20V

RMS

, f = 1kHz

0.00055 0.0015 % (max)

A

V

Closed Loop Voltage Gain 26 dB (min)

A

V

Open Loop Gain

VIN = 1mV

RMS

, f = 1kHz

93 dB

f = DC 120 dB

V

OM

Output Voltage Swing THD+N = 0.05%, Freq = 20Hz to 20kHz 33 V

RMS

V

NOISE

Output Noise

LPF = 30kHz, Av = 29dB

100

μV

A-weighted 70 180

μV (max)

I

OUT

Output Current Outputs Shorted 8 6.5 mA(min)

I

SD

Current into Shutdown Pin To put part in “play” mode 1.5

1
2

mA(min)

mA (max)

SR Slew Rate

VIN = 1.2V

P-P

, f = 10kHz square Wave,

Outputs shorted

16 13

V/μs (min)

V

OS

Input Offset Voltage VCM = 0V, IO = 0mA 1 3 mV (max)

I

B

Input Bias Current VCM = 0V, IO = 0mA

100 nA

PSRR Power Supply Rejection Ratio DC, Input Referred 115 105 dB (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

(Limits)

Typical Limit

(Note 6) (Note 7)

I

CC

Total Quiescent Power Supply
Current

VCM = 0V, VO = 0V, IO = 0A

17 22 mA (max)

I

EE

Total Quiescent Power Supply
Current

VCM = 0V, VO = 0V, IO = 0A

19 24 mA (max)

THD+N

Total Harmonic Distortion +
Noise

No load, AV = 30dB
V

OUT

= 30V

RMS

, f = 1kHz

0.00035 0.001 % (max)

A

V

Closed Loop Voltage Gain 26 dB (min)

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LME49811

Symbol Parameter Conditions LME49811 Units

(Limits)

Typical Limit

(Note 6) (Note 7)

A

V

Open Loop Gain

VIN = 1mV

RMS

, f = 1kHz 93 dB

f = DC 120 dB

V

OM

Output Voltage Swing THD+N = 0.05%, Freq = 20Hz to 20kHz 68 V

RMS

V

NOISE

Output Noise

LPF = 30kHz, Av = 29dB 100

μV

A-weighted 70 180

μV (max)

I

OUT

Output Current Outputs Shorted 9 7 mA(min)

I

SD

Current into Shutdown Pin To put part in “play” mode 1.5

1
2

mA(min)

mA (max)

SR Slew Rate

VIN = 1.2V

P-P

, f = 10kHz square Wave,

Outputs shorted

17 14

V/μs (min)

V

OS

Input Offset Voltage VCM = 0V, IO = 0mA 1 3 mV (max)

I

B

Input Bias Current VCM = 0V, IO = 0mA

100 nA (max)

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

JMAX

, θJA, and the ambient temperature, TA. The maximum

allowable power dissipation is P

DMAX

= (T

JMAX

- TA) / θJA or the number given in Absolute Maximum Ratings, whichever is lower.

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.

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LME49811

Typical Performance Characteristics for LME49811 (Note 9)

THD+N vs Frequency

+VCC = –VEE = 100V, VO = 14V

30004873

THD+N vs Frequency

+VCC = –VEE = 100V, VO = 30V

30004874

THD+N vs Frequency

+VCC = –VEE = 50V, VO = 10V

30004871

THD+N vs Frequency

+VCC = –VEE = 50V, VO = 20V

30004872

THD+N vs Frequency

+VCC = –VEE = 20V, VO = 5V

30004869

THD+N vs Frequency

+VCC = –VEE = 20V, VO = 10V

30004870

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LME49811