Philips lm3886 DATASHEETS

May 1999

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
4Ω load and 38W into 8Ω with 0.1%(THD + N) from
20 Hz–20 kHz.

The performance of the LM3886, utilizing its Self Peak In­stantaneous Temperature (˚Ke) (SPiKe
cuitry, puts it in a class above discrete and hybrid amplifiers
by providing an inherently, dynamically protected SafeOper­ating Area (SOA). SPiKe Protection means that these parts
are completely safeguarded at the output against overvolt­age, 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 92 dB with a typical low noise floor of 2.0 µV. It
exhibits extremely low (THD + N) values of 0.03%at the
rated output intotherated load over the audio spectrum, and
provides excellent linearity with an IMD (SMPTE) typical rat­ing of 0.004%.

™

) Protection Cir-

Features

=

n 68W cont. avg. output power into 4Ω at V

±

28V

CC

n 38W cont. avg. output power into 8Ω at V
n 50W cont. avg. output power into 8Ω at V
n 135W instantaneous peak output power capability
n Signal-to-Noise Ratio ≥ 92 dB
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
eliminating turn-on and turn-off transients

n 11-lead TO-220 package

|+|VCC| ≤ 12V, thus

EE

Applications

n Component stereo
n Compact stereo
n Self-powered speakers
n Surround-sound amplifiers
n High-end stereo TVs

=

CC

=

CC

w/Mute

LM3886

Overture

±

28V

±

35V

Audio Power Amplifier Series High-Performance 68W Audio Power Amplifier

Typical Application

*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.

© 1999 National Semiconductor Corporation DS011833 www.national.com

DS011833-1

Connection Diagram

Plastic Package (Note 12)

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

DS011833-2

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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

(No Signal) 94V

Supply Voltage |V

(Input Signal) 84V

Common Mode Input Voltage (V

Differential Input Voltage (Note 16) 60V
Output Current Internally Limited
Power Dissipation (Note 7) 125W

|+|V−|

+

|+|V−|

+

or V−) and

+

|+|V−|≤80V

|V

ESD Susceptibility (Note 8) 3000V
Junction Temperature (Note 9) 150˚C
Soldering Information

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

θ

JC

θ

JA

1˚C/W

43˚C/W

Operating Ratings (Notes 5, 6)

Temperature Range

≤ TA≤ T

T

MIN

Supply Voltage |V

MAX

+

|+|V−| 20V to 84V

−20˚C ≤ TA≤ +85˚C

Electrical Characteristics (Notes 5, 6)

The following specifications apply for V
apply for T

=

25˚C.

A

+

=

+28V, V

−

=

−28V, I

MUTE

=

−0.5 mA with R

Symbol Parameter Conditions

+

|V

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

A

M

Mute Attenuation Pin 8 Open or at 0V, Mute: On

−V−≥9V

pin7

Current out of Pin 8

>

Mute: Off

P

O

(Note 4)

Peak P
THD + N Total Harmonic Distortion Plus Noise 60W, R

SR
(Note 4)

+

(Note 4) Total Quiescent Power Supply

I

V

OS

(Note 3)
I

B

I

OS

I

o

V

od

(Note 3)
PSRR

(Note 3)

CMRR
(Note 3)

A

VOL

(Note 3)
GBWP Gain-Bandwidth Product |V

Output Power (Continuous Average) THD + N=0.1%(max)

f=1 kHz; f=20 kHz

+

|=|V−|=28V, R

|V

+

|=|V−|=28V, R

|V

+

|=|V−|=35V, R

|V

Instantaneous Peak Output Power 135 W

O

Slew Rate (Note 13) V

Current
Input Offset Voltage V

Input Bias Current V
Input Offset Current V

=

L

=

30W, R

L

20 Hz ≤ f ≤ 20 kHz

=

26 dB

A

V

=

2.0Vp-p, t

IN

=

V

0V, V

CM

=

0V, I

CM

=

0V, I

CM

=

0V, I

CM

Output Current Limit |V+|=|V−|=20V, t
Output Dropout Voltage (Note 15) |V

Power Supply Rejection Ratio V

Common Mode Rejection Ratio V

Open Loop Voltage Gain |V

+

–VO|, V

–V−|, V

|V

O

+

=

40V to 20V, V

=

0V, I

V

CM
+

=

40V, V

V

=

0V, I

V

CM
+

=

60V to 20V, V

=

20V to −20V, I

V

CM

+

|=|V−|=28V, R

+

|=|V−|=30V

=

100 kHz, V

f

O

L
L
L

4Ω,
8Ω,

=

RISE

=

0V, I

o

o

=

0mA

o

=

0 mA 0.2 1 µA (max)

o

=

0 mA 0.01 0.2 µA (max)

o

ON

+

=

28V, I

=

−28V, I

=

0mA

o

−

=

−40V to −20V,

=

0mA

o

=

IN

o

−

=

−

=

o

L

50 mVrms

−

0.5 mA,

=

4Ω

=

8Ω

=

8Ω

2ns

=

0A

=

10 ms, V

=

+100 mA

=

−100 mA

o

−40V,

−20V to −60V,
=

0mA

=

2kΩ,∆V

=

4Ω unless otherwise specified. Limits

L

LM3886

Typical

(Note 10)

18

Limit

(Note 11)

20
84

115 80 dB (min)

68

6030W (min)
38
50

0.03

0.03

19 8

50 85 mA (max)

1 10 mV (max)

=

0V 11.5 7 A (min)

O

1.6

2.5

120

2.0

3.0
8585dB (min)

105

110 85 dB (min)

=

40V

O

115 90 dB (min)

82

Units

(Limits)

V (min)

V (max)

W (min)

W

%
%

V/µs

(min)

V (max)
V (max)

dB (min)

MHz

(min)

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Electrical Characteristics (Notes 5, 6) (Continued)

+

The following specifications apply for V
apply for T

=

25˚C.

A

=

Symbol Parameter Conditions

e

IN

(Note 4)

Input Noise IHF—A Weighting Filter

SNR Signal-to-Noise Ratio P

IMD Intermodulation Distortion Test 60 Hz, 7 kHz, 4:1 (SMPTE)

Note 2: Operation is guaranteed up to 84V, however, distortion may be introduced from SPIKeProtection 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
Note 4: AC Electrical Test; refer to Test Circuit
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 of

=

θ

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

JC

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

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

mance Characteristics section.
Note 16: The Differential Input Voltage Absolute Maximum Rating is based on supply voltages of V

−

.

−

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

#

1.

#

2.

+28V, V

−

=

−28V, I

=

R

IN

=

1W, A-Weighted,

O

Measured at 1 kHz, R

=

P

60W, A-Weighted,

O

Measured at 1 kHz, R

=

−0.5 mA with R

MUTE

600Ω (Input Referred)

S

S

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

=

=

25Ω

25Ω

+

=

=

4Ω unless otherwise specified. Limits

L

LM3886

Typical

(Note 10)

(Note 11)

2.0 10 µV (max)

92.5 dB

110 dB

0.004

0.009

−

potential when the LM3886 is directly

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

CS

−

+40V and V

=

−40V.

Limit

(Limits)

Units

%

Test Circuit#1 (DC Electrical Test Circuit)

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DS011833-3

Test Circuit#2 (AC Electrical Test Circuit)

Single Supply Application Circuit

DS011833-4

*Optional components dependent upon specific design requirements. Refer to the External

Components Description section for a component functional description.

FIGURE 2. Typical Single Supply Audio Amplifier Application Circuit

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Equivalent Schematic (excluding active protection circuitry)

DS011833-6

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