NSC LM3886TF, LM3886MWC, LM3886DWF, LM3886T Datasheet
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
™
) Protection Circuitry, 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%.
Features
n 68W cont. avg. output power into 4Ω at V
CC
=
±
28V
n 38W cont. avg. output power into 8Ω at V
CC
=
±
28V
n 50W cont. avg. output power into 8Ω at V
CC
=
±
35V
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
EE
|+|VCC| ≤ 12V, thus
eliminating turn-on and turn-off transients
n 11-lead TO-220 package
Applications
n Component stereo
n Compact stereo
n Self-powered speakers
n Surround-sound amplifiers
n High-end stereo TVs
Typical Application
Overture™and SPiKe™Protection are trademarks of National Semiconductor Corporation.
DS011833-1
*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
May 1999
LM3886
Overture
Audio Power Amplifier Series High-Performance 68W Audio Power Amplifier
w/Mute
© 1999 National Semiconductor Corporation DS011833 www.national.com
Connection Diagram
Plastic Package (Note 12)
DS011833-2
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) 94V
Supply Voltage |V
+
|+|V−|
(Input Signal) 84V
Common Mode Input Voltage (V
+
or V−) and
|V
+
|+|V−|≤80V
Differential Input Voltage (Note 16) 60V
Output Current Internally Limited
Power Dissipation (Note 7) 125W
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
1˚C/W
θ
JA
43˚C/W
Operating Ratings (Notes 5, 6)
Temperature Range
T
MIN
≤ TA≤ T
MAX
−20˚C ≤ TA≤ +85˚C
Supply Voltage |V
+
|+|V−| 20V to 84V
Electrical Characteristics (Notes 5, 6)
The following specifications apply for V
+
=
+28V, V
−
=
−28V, I
MUTE
=
−0.5 mA with R
L
=
4Ω unless otherwise specified. Limits
apply for T
A
=
25˚C.
Symbol Parameter Conditions
LM3886
Units
(Limits)
Typical
(Note 10)
Limit
(Note 11)
|V
+
|+|V−| Power Supply Voltage (Note 14) V
pin7
−V−≥9V
18
20
84
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 80 dB (min)
P
O
(Note 4)
Output Power (Continuous Average) THD + N=0.1%(max)
f=1 kHz; f=20 kHz
|V
+
|=|V−|=28V, R
L
=
4Ω
|V
+
|=|V−|=28V, R
L
=
8Ω
|V
+
|=|V−|=35V, R
L
=
8Ω
68
38
50
6030W (min)
W (min)
W
Peak P
O
Instantaneous Peak Output Power 135 W
THD + N Total Harmonic Distortion Plus Noise 60W, R
L
=
4Ω,
30W, R
L
=
8Ω,
20 Hz ≤ f ≤ 20 kHz
A
V
=
26 dB
0.03
0.03
%
%
SR
(Note 4)
Slew Rate (Note 13) V
IN
=
2.0Vp-p, t
RISE
=
2ns
19 8
V/µs
(min)
I
+
(Note 4) Total Quiescent Power Supply
Current
V
CM
=
0V, V
o
=
0V, I
o
=
0A
50 85 mA (max)
V
OS
(Note 3)
Input Offset Voltage V
CM
=
0V, I
o
=
0mA
1 10 mV (max)
I
B
Input Bias Current V
CM
=
0V, I
o
=
0 mA 0.2 1 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 7 A (min)
V
od
(Note 3)
Output Dropout Voltage (Note 15) |V
+
–VO|, 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)
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
105
8585dB (min)
dB (min)
CMRR
(Note 3)
Common Mode Rejection Ratio V
+
=
60V to 20V, V
−
=
−20V to −60V,
V
CM
=
20V to −20V, I
o
=
0mA
110 85 dB (min)
A
VOL
(Note 3)
Open Loop Voltage Gain |V
+
|=|V−|=28V, R
L
=
2kΩ,∆V
O
=
40V
115 90 dB (min)
GBWP Gain-Bandwidth Product |V
+
|=|V−|=30V
f
O
=
100 kHz, V
IN
=
50 mVrms
82
MHz
(min)
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Electrical Characteristics (Notes 5, 6) (Continued)
The following specifications apply for V
+
=
+28V, V
−
=
−28V, I
MUTE
=
−0.5 mA with R
L
=
4Ω unless otherwise specified. Limits
apply for T
A
=
25˚C.
Symbol Parameter Conditions
LM3886
Units
(Limits)
Typical
(Note 10)
Limit
(Note 11)
e
IN
(Note 4)
Input Noise IHF—A Weighting Filter
R
IN
=
600Ω (Input Referred)
2.0 10 µV (max)
SNR Signal-to-Noise Ratio P
O
=
1W, A-Weighted,
Measured at 1 kHz, R
S
=
25Ω
92.5 dB
P
O
=
60W, A-Weighted,
Measured at 1 kHz, R
S
=
25Ω
110 dB
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 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
#
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 of
θ
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 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
−
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, θ
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.
Test Circuit#1 (DC Electrical Test Circuit)
DS011833-3
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Test Circuit#2 (AC Electrical Test Circuit)
Single Supply Application Circuit
DS011833-4
DS011833-5
*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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