LM3886.pdf

October 2003

LM3886 Overture ™ Audio Power Amplifier Series

High-Performance 68W Audio Power Amplifier w/Mute

General Description

The LM3886 is a high-performance audio power amplifier

capable of delivering 68W of continuous average power to a

n 135W instantaneous peak output power capability

n Signal-to-Noise Ratio

92dB

Ω

load and 38W into 8

with 0.1% THD+N from

n An input mute function

n Output protection from a short to ground or to the

supplies via internal current limiting circuitry

n Output over-voltage protection against transients from

inductive loads

n Supply under-voltage protection, not allowing internal

biasing to occur when |V EE |+|V CC | ≤ 12V, thus

eliminating turn-on and turn-off transients

n 11-lead TO-220 package

n Wide supply range 20V - 94V

20Hz–20kHz.

The performance of the LM3886, utilizing its Self Peak In-

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

cuitry, puts it in a class above discrete and hybrid amplifiers

by providing an inherently, dynamically protected Safe Op-

erating Area (SOA). SPiKe protection means that these

parts are completely safeguarded at the output against ov-

ervoltage, undervoltage, overloads, including shorts to the

supplies, thermal runaway, and instantaneous temperature

peaks.

The LM3886 maintains an excellent signal-to-noise ratio of

greater than 92dB with a typical low noise floor of 2.0µV. It

exhibits extremely low THD+N values of 0.03% at the rated

output into the rated load over the audio spectrum, and

provides excellent linearity with an IMD (SMPTE) typical

rating of 0.004%.

Applications

n Component stereo

n Compact stereo

n Self-powered speakers

n Surround-sound amplifiers

n High-end stereo TVs

Features

n 68W cont. avg. output power into 4

Ω

at V CC = ± 28V

n 38W cont. avg. output power into 8

Ω

at V CC = ± 28V

n 50W cont. avg. output power into 8

Ω

at V CC = ± 35V

Typical Application

01183301

*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

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

DS011833

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≥

Ω

Connection Diagram

Plastic Package (Note 12)

01183302

Note 1: Preliminary: call you local National Sales Rep. or distributor for availability

Top View

Order Number LM3886T

or LM3886TF

See NS Package Number TA11B for

Staggered Lead Non-Isolated

Package or TF11B (Note 1) for

Staggered Lead Isolated Package

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Absolute Maximum Ratings (Notes 6, 5)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage |V + |+|V − |

(No Signal)

ESD Susceptibility (Note 8)

3000V

94V

Junction Temperature (Note 9)

150˚C

Supply Voltage |V + |+|V − |

(Input Signal)

84V

Soldering Information

T Package (10 seconds)

260˚C

Common Mode Input Voltage

(V + or V − ) and

|V + |+|V − |

Storage Temperature

−40˚C to +150˚C

≤

80V

Thermal Resistance

θ JC

Differential Input Voltage (Note

16)

1˚C/W

60V

43˚C/W

Output Current

Internally Limited

Power Dissipation (Note 7)

125W

Operating Ratings (Notes 5, 6)

Temperature Range

T MIN ≤

Supply Voltage |V + |+|V − |

20V to 84V

T A ≤

T MAX

−20˚C

T A ≤

+85˚C

Electrical Characteristics (Notes 5, 6)

The following specifications apply for V + = +28V, V − = −28V, I MUTE = −0.5 mA with R L =4

Ω

unless otherwise specified. Limits

apply for T A = 25˚C.

LM3886

Units

(Limits)

Symbol

Parameter

Conditions

Typical

(Note 10)

Limit

(Note 11)

|V + |+|V − | Power Supply Voltage (Note 14)

V pin7 −V −

≥

V (min)

V (max)

A M

Mute Attenuation

Pin 8 Open or at 0V, Mute: On

Current out of Pin 8 > 0.5 mA,

Mute: Off

115

dB (min)

P O (Note 4) Output Power (Continuous Average)

THD+N=0.1% (max)

f=1kHz;f=20kHz

|V + |=|V − | = 28V, R L =4 Ω

|V + |=|V − | = 28V, R L =8

Ω

|V + |=|V − | = 35V, R L =8

W (min)

Ω

Peak P O

Instantaneous Peak Output Power

135

THD + N

Total Harmonic Distortion Plus Noise

60W, R L =4

Ω

20 Hz ≤ f ≤ 20 kHz

A V =26dB

Ω

0.03

SR (Note 4) Slew Rate (Note 13)

V IN = 2.0Vp-p, t RISE = 2 ns

V/µs (min)

I + (Note 4) Total Quiescent Power Supply Current V CM = 0V, V o = 0V, I o = 0A

mA (max)

V OS

(Note 3)

Input Offset Voltage

V CM = 0V, I o =0mA

mV (max)

I B

Input Bias Current

V CM = 0V, I o = 0 mA

0.2

µA (max)

I OS

Input Offset Current

V CM = 0V, I o = 0 mA

0.01

0.2

µA (max)

I o

Output Current Limit

|V + |=|V − | = 20V, t ON = 10 ms, V O = 0V

11.5

A (min)

V od

(Note 3)

Output Dropout Voltage (Note 15)

|V + –V O |, V + = 28V, I o = +100 mA

|V O –V − |, V − = −28V, I o = −100 mA

1.6

2.5

2.0

3.0

V (max)

PSRR

(Note 3)

Power Supply Rejection Ratio

V + = 40V to 20V, V − = −40V,

V CM = 0V, I o =0mA

V + = 40V, V − = −40V to −20V,

V CM = 0V, I o =0mA

120

dB (min)

105

dB (min)

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≤

30W, R L =8

Electrical Characteristics (Notes 5, 6) (Continued)

The following specifications apply for V + = +28V, V − = −28V, I MUTE = −0.5 mA with R L =4

Ω

unless otherwise specified. Limits

apply for T A = 25˚C.

LM3886

Units

(Limits)

Symbol

Parameter

Conditions

Typical

(Note 10)

Limit

(Note 11)

CMRR

(Note 3)

Common Mode Rejection Ratio

V + = 60V to 20V, V − = −20V to −60V,

V CM = 20V to −20V, I o =0mA

110

dB (min)

A VOL

(Note 3)

Open Loop Voltage Gain

|V + |=|V − | = 28V, R L =2k

Ω

∆

V O = 40V

115

dB (min)

GBWP

Gain-Bandwidth Product

|V + |=|V − | = 30V

f O = 100 kHz, V IN = 50 mVrms

MHz (min)

e IN (Note 4) Input Noise

IHF — A Weighting Filter

R IN = 600 Ω (Input Referred)

2.0

µV (max)

SNR

Signal-to-Noise Ratio

P O = 1W, A-Weighted,

Measured at 1 kHz, R S =25 Ω

92.5

P O = 60W, A-Weighted,

Measured at 1 kHz, R S =25

Ω

110

IMD

Intermodulation Distortion Test

60 Hz, 7 kHz, 4:1 (SMPTE)

60 Hz, 7 kHz, 1:1 (SMPTE)

0.004

0.009

Note 2: Operation is guaranteed up to 84V, however, distortion may be introduced from SPIKe Protection Circuitry if proper thermal considerations are not taken

into account. Refer to the Thermal Considerations section for more information. (See SPIKe Protection Response)

Note 3: DC Electrical Test; refer to Test Circuit #1.

Note 4: AC Electrical Test; refer to Test Circuit #2.

Note 5: All voltages are measured with respect to the GND pin (pin 7), unless otherwise specified.

Note 6: 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 and AC 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 7: 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

resistor.

Note 9: The operating junction temperature maximum is 150˚C, however, the instantaneous Safe Operating Area temperature is 250˚C.

Note 10: Typicals are measured at 25˚C and represent the parametric norm.

Note 11: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 12: The LM3886T package TA11B is a non-isolated package, setting the tab of the device and the heat sink at V −

Ω

potential when the LM3886 is directly

mounted to the heat sink using only thermal compound. If a mica washer is used in addition to thermal compound,

CS (case to sink) is increased, but the heat sink

will be isolated from V − .

Note 13: The feedback compensation network limits the bandwidth of the closed-loop response and so the slew rate will be reduced due to the high frequency

roll-off. Without feedback compensation, the slew rate is typically larger.

Note 14: V − must have at least −9V at its pin with reference to ground in order for the under-voltage protection circuitry to be disabled.

Note 15: The output dropout voltage is the supply voltage minus the clipping voltage. Refer to the Clipping Voltage vs Supply Voltage graph in the Typical

Performance Characteristics section.

Note 16: The Differential Input Voltage Absolute Maximum Rating is based on supply voltages of V + = +40V and V − = −40V.

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JC = 1.0 ˚C/W (junction to case). Refer to the Thermal Resistance figure in the Application Information section under Thermal Considerations.

Note 8: Human body model, 100 pF discharged through a 1.5 k

Test Circuit #1 (DC Electrical Test Circuit)

01183303

Test Circuit #2 (AC Electrical Test Circuit)

01183304

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