lm4701.pdf

August 2000

LM4701 Overture ™ Audio Power Amplifier Series

30W Audio Power Amplifier with

Mute and Standby Modes

General Description

The LM4701 is an audio power amplifier capable of deliver-

ing typically 30W of continuous average output power into an

Key Specifications

n THD+N at 1kHz at continuous average output power of

25W into 8

load with less than 0.1% THD+N.

The LM4701 has an independent smooth transition fade-in/

out mute and a power conserving standby mode which can

be controlled by external logic.

The performance of the LM4701, utilizing its Self Peak In-

stantaneous Temperature (˚Ke) ( SPiKe ™ ) protection cir-

cuitry, places it in a class above discrete and hybrid amplifi-

ers by providing an inherently, dynamically protected Safe

Operating Area (SOA). SPiKe protection means that these

parts are completely safeguarded at the output against over-

voltage, undervoltage, overloads, including thermal runaway

and instantaneous temperature peaks.

0.08% (typ)

n Standby current:

2.1mA (typ)

Features

n SPiKe Protection

n Minimal amount of external components necessary

n Quiet fade-in/out mute function

n Power conserving standby-mode

n Non-Isolated 9-lead TO-220 package

n Wide supply range 20V - 66V

Applications

n TVs

n Component stereo

n Compact stereo

Typical Application

Connection Diagram

Plastic Package

DS100835-2

Top View

Order Number LM4701T

See NS Package Number TA9A

For Staggered Lead Non-Isolated Package

Only a 9-Pin Package

DS100835-1

* Optional components dependent upon specific design requirements. Refer

to the External Components Description section for a component functional

description.

FIGURE 1. Typical Audio Amplifier Application Circuit

SPiKe ™ Protection and Overture ™ are trademarks of National Semiconductor Corporation.

DS100835

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: 0.1% (max)

n THD+N from 20Hz to 20kHz at 30W of continuous

average output power into 8 W :

Absolute Maximum Ratings (Notes 5, 4)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage |V CC |+|V EE |

(No Signal)

Junction Temperature (Note 8)

150˚C

Thermal Resistance

q JC

1.8˚C/W

q JA

43˚C/W

66V

Soldering Information

TF Package (10 sec.)

260˚C

Storage Temperature

−40˚C

T A £

+150˚C

Supply Voltage |V CC |+|V EE |

(with Input and Load)

64V

Common Mode Input Voltage

(V CC or V EE ) and

|V CC |+|V EE |

Operating Ratings (Notes 4, 5)

60V

Differential Input Voltage

60V

Temperature Range

T MIN

Output Current

Internally Limited

T A

T MAX

−20˚C

T A

+85˚C

Power Dissipation (Note 6)

62.5W

Supply Voltage |V CC |+|V EE | (Note 1)

20V to 64V

ESD Susceptibility (Note 7)

2000V

Electrical Characteristics

(Notes 4, 5) The following specifications are for V CC = +28V, V EE = −28V with R L =8 W , unless otherwise specified. Limits ap-

ply for T A = 25˚C.

Symbol

Parameter

Conditions

LM4701

Units

(Limits)

Typical Limit

(Note 9) (Note 10)

|V CC |+|V EE |

Power Supply Voltage

GND − V EE

³ 9V

V (min)

(Note 11)

V (max)

P O

Output Power

THD + N = 0.1% (max), f = 1 kHz

(Note 3)

(Continuous Average)

R L =8

,|V CC |=|V EE | = 28V

W/ch

(min)

R L =4

,|V CC |=|V EE | = 20V (Note 13)

W/ch

(min)

THD + N

Total Harmonic Distortion

30W/ch, R L =8

0.08

Plus Noise

20 Hz

20 kHz, A V =26dB

SR (Note 3)

Slew Rate

V IN = 1.414 Vrms, t rise = 2 ns

V/µs (min)

I TOTAL

Total Quiescent Power

V CM = 0V, V O = 0V, I O =0mA

(Note 2)

Supply Current

Standby: Off

mA (max)

Standby: On

2.1

Standby Pin

V IL

Standby Low Input Voltage

Not in Standby Mode

0.8

V (max)

V IH

Standby High Input Voltage

In Standby Mode

2.0

2.5

V (min)

Mute Pin

V IL

Mute Low Input Voltage

Output Not Muted

0.8

V (max)

V IH

Mute High Input Voltage

Output Muted

2.0

2.5

V (min)

A M

Mute Attenuation

V PIN8 = 2.5V

115

dB (min)

V OS (Note 2)

Input Offset Voltage

V CM = 0V, I O = 0 mA

2.0

mV (max)

I B

Input Bias Current

V CM = 0V, I O = 0 mA

0.2

0.5

µA (max)

I OS

Input Offset Current

V CM = 0V, I O = 0 mA

0.002

0.2

µA (max)

I O

Output Current Limit

|V CC |=|V EE | = 10V, t ON = 10 ms,

3.5

2.9

A PK (min)

V O =0V

V OD

Output Dropout Voltage

|V CC −V O |, V CC = 20V, I O = +100 mA

1.8

2.3

V (max)

(Note 2)

(Note 12)

|V O −V EE |, V EE = −20V, I O = −100 mA

2.5

3.2

V (max)

PSRR

Power Supply Rejection Ratio

V CC = 30V to 10V, V EE = −30V,

115

dB (min)

(Note 2)

V CM = 0V, I O =0mA

V CC = 30V, V EE = −30V to −10V

110

dB (min)

V CM = 0V, I O =0mA

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Electrical Characteristics (Continued)

(Notes 4, 5) The following specifications are for V CC = +28V, V EE = −28V with R L =8 W , unless otherwise specified. Limits ap-

ply for T A = 25˚C.

Symbol

Parameter

Conditions

LM4701

Units

(Limits)

Typical Limit

(Note 9) (Note 10)

CMRR (Note

Common Mode Rejection Ratio V CC = 35V to 10V, V EE = −10V to −35V,

110

dB (min)

V CM = 10V to −10V, I O =0mA

A VOL (Note 2) Open Loop Voltage Gain

R L =2k

V O = 30V

110

dB (min)

GBWP

Gain-Bandwidth Product

f O = 100 kHz, V IN = 50 mVrms

7.5

MHz (min)

e IN

Input Noise

IHF — A Weighting Filter

2.0

µV (max)

(Note 3)

R IN = 600 W (Input Referred)

SNR

Signal-to-Noise Ratio

P O = 1W, A-Weighted,

Measured at 1 kHz, R S =25

P O = 25W, A-Weighted

108

Note 1: Operation is guaranteed up to 64V, however, distortion may be introduced from SPiKe Protection Circuitry if proper thermal considerations are not taken into

account. Refer to the Application Information section for a complete explanation.

Note 2: DC Electrical Test; Refer to Test Circuit #1.

Note 3: AC Electrical Test; Refer to Test Circuit #2.

Note 4: All voltages are measured with respect to the GND (pin 7), unless otherwise specified.

Note 5: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is func-

tional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guar-

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 6: 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

Measured at 1 kHz, R S =25

JC = 1.8 ˚C/W (junction to case). Refer to the section, Determining the Correct Heat Sink, in the Application Information section.

Note 7: Human body model, 100 pF discharged through a 1.5 k

resistor.

Note 8: The operating junction temperature maximum is 150˚C, however, the instantaneous Safe Operating Area temperature is 250˚C.

Note 9: Typicals are measured at 25˚C and represent the parametric norm.

Note 10: Limits are guarantees that all parts are tested in production to meet the stated values.

Note 11: V EE must have at least −9V at its pin with reference to ground in order for the under-voltage protection circuitry to be disabled. In addition, the voltage dif-

ferential between V CC and V EE must be greater than 14V.

Note 12: The output dropout voltage, V OD , is the supply voltage minus the clipping voltage. Refer to the Clipping Voltage vs. Supply Voltage graph in the Typical Per-

formance Characteristics section.

Note 13: Fora4

load, and with ± 20V supplies, the LM4701 can deliver typically 22 Watts of continuous average power per channel with less than 0.1% (THD+N).

With supplies above ± 20V, the LM4701 cannot deliver more than 22 watts into 4 W due to current limiting of the output transistors. Thus, increasing the power supply

above ± 20V will only increase the internal power dissipation, not the possible output power. Increased power dissipation will require a larger heat sink as explained

in the Application Information section.

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Test Circuit #1 (Note 2) (DC Electrical Test Circuit)

DS100835-3

Test Circuit # 2 (Note 3) (AC Electrical Test Circuit)

DS100835-4

Bridged Amplifier Application Circuit

DS100835-5

FIGURE 2. Bridged Amplifier Application Circuit

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Single Supply Application Circuit

DS100835-6

FIGURE 3. Single Supply Amplifier Application Circuit

Auxillary Amplifier Application Circuit

DS100835-7

FIGURE 4. Auxillary Amplifier Application Circuit

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