NSC LM4701T Datasheet
LM4701
Overture
™
Audio Power Amplifier Series
30W Audio Power Amplifier with
March 1998
30W Audio Power Amplifier with Mute and Standby Modes
LM4701
Overture
Mute and Standby Modes
General Description
The LM4701 is an audio power amplifier capable of delivering typically30W of continuous average output power into an
8Ω 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 Instantaneous Temperature (˚Ke) (SPiKe
cuitry, places it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe
Operating Area (SOA). SPiKe Protection means that these
parts arecompletely safeguarded at the output against overvoltage, undervoltage, overloads, including thermal runaway
and instantaneous temperature peaks.
™
) Protection Cir-
Typical Application Connection Diagram
Key Specifications
n THD+N at 1 kHz at continuous average output power of
25W into 8Ω: 0.1%(max)
n THD+N from 20 Hz to 20 kHz at 30W of continuous
average output power into 8Ω: 0.08%(typ)
n Standby current: 2.1 mA (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
Applications
n TVs
n Component stereo
n Compact stereo
Plastic Package
Audio Power Amplifier Series
DS100835-2
Top View
Order Number LM4701T
See NS Package Number TA9A
For Staggered Lead Non-Isolated Package
*
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.
© 1999 National Semiconductor Corporation DS100835 www.national.com
DS100835-1
Only a 9-Pin Package
Absolute Maximum Ratings (Notes 5, 4)
If Military/Aerospace specified devices are required,
please contact the NationalSemiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage |V
(No Signal) 66V
Supply Voltage |V
(with Input and Load) 64V
Common Mode Input Voltage (V
Differential Input Voltage 60V
Output Current Internally Limited
Power Dissipation (Note 6) 62.5W
ESD Susceptibility (Note 7) 2000V
|+|VEE|
CC
|+|VEE|
CC
or VEE) and
CC
|+|VEE| ≤ 60V
|V
CC
Junction Temperature (Note 8) 150˚C
Thermal Resistance
θ
JC
θ
JA
1.8˚C/W
43˚C/W
Soldering Information
TF Package (10 sec.) 260˚C
Storage Temperature −40˚C ≤ T
A
+150˚C
Operating Ratings (Notes 4, 5)
Temperature Range
≤ TA≤ T
T
MIN
Supply Voltage |V
MAX
|+|VEE| (Note 1) 20V to 64V
CC
−20˚C ≤ TA≤ +85˚C
≤
Electrical Characteristics
(Notes 4, 5) The following specifications are for V
ply for T
=
25˚C.
A
=
+28V, V
CC
Symbol Parameter Conditions LM4701 Units
|+|VEE| Power Supply Voltage GND − VEE≥ 9V 18 20 V (min)
|V
CC
(Note 11) 64 V (max)
P
O
(Note 3) (Continuous Average) R
Output Power THD + N=0.1%(max), f=1 kHz
=
8Ω,|V
L
=
R
4Ω,|V
L
THD + N Total Harmonic Distortion 30W/ch, R
Plus Noise 20 Hz ≤ f ≤ 20 kHz, A
SR (Note 3) Slew Rate V
I
TOTAL
Total Quiescent Power V
=
IN
=
CM
(Note 2) Supply Current Standby: Off 25 40 mA (max)
Standby: On 2.1 mA
Standby Pin
V
IL
V
IH
Standby Low Input Voltage Not in Standby Mode 0.8 V (max)
Standby High Input Voltage In Standby Mode 2.0 2.5 V (min)
Mute Pin
V
IL
V
IH
A
M
V
(Note 2) Input Offset Voltage V
OS
I
B
I
OS
I
O
V
OD
(Note 2) (Note 12) |V
PSRR Power Supply Rejection Ratio V
(Note 2) V
Mute Low Input Voltage Output Not Muted 0.8 V (max)
Mute High Input Voltage Output Muted 2.0 2.5 V (min)
Mute Attenuation V
Input Bias Current V
Input Offset Current V
PIN8
CM
CM
CM
=
=
=
Output Current Limit |VCC|=|VEE|=10V, t
=
V
0V
O
Output Dropout Voltage |VCC−VO|, V
O−VEE
=
CC
=
CM
=
V
CC
=
V
CM
=
EE
−28V with R
=
8Ω, unless otherwise specified. Limits ap-
L
Typical Limit
(Limits)
(Note 9) (Note 10)
|=|VEE|=28V 30 25 W/ch
CC
|=|VEE|=20V (Note 13) 22 15 W/ch
CC
=
8Ω, 0.08
L
1.414 Vrms, t
0V, V
O
=
2.5V 115 80 dB (min)
=
0V, I
O
=
0V, I
O
=
0V, I
O
CC
|, V
EE
30V to 10V, V
=
0V, I
O
30V, V
EE
=
0V, I
O
=
26 dB
V
=
2 ns 18 12 V/µs (min)
rise
=
=
0V, I
0mA
O
0 mA 2.0 15 mV (max)
0 mA 0.2 0.5 µA (max)
0 mA 0.002 0.2 µA (max)
=
10 ms, 3.5 2.9 A
=
=
−20V, I
ON
=
20V, I
+100 mA 1.8 2.3 V (max)
O
=
−100 mA 2.5 3.2 V (max)
O
=
−30V, 115 85 dB (min)
EE
PK
0mA
=
−30V to −10V 110 85 dB (min)
0mA
(min)
(min)
%
(min)
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Electrical Characteristics (Continued)
(Notes 4, 5) The following specifications are for V
ply for T
=
25˚C.
A
CC
=
+28V, V
Symbol Parameter Conditions LM4701 Units
CMRR (Note2)Common Mode Rejection Ratio V
A
(Note 2) Open Loop Voltage Gain R
VOL
GBWP Gain-Bandwidth Product f
e
IN
Input Noise IHF—A Weighting Filter 2.0 8 µV (max)
(Note 3) R
SNR Signal-to-Noise Ratio P
=
CC
=
V
CM
=
2kΩ,∆V
L
=
100 kHz, V
O
=
IN
=
1W, A-Weighted, 98 dB
O
Measured at 1 kHz, R
=
P
25W, A-Weighted 108 dB
O
Measured at 1 kHz, R
Note 1: Operation isguaranteed up to 64V, however, distortion may beintroduced from SPiKe ProtectionCircuitry if proper thermalconsiderations are not takeninto
account. Refer to the Application Information section for a complete explanation.
Note 2: DC Electrical Test; Refer to Test Circuit
Note 3: AC Electrical Test; Refer to Test Circuit
Note 4: All voltages are measured with respect to the GND (pin 7), unless otherwise specified.
Note 5: Absolute MaximumRatings indicate limits beyond whichdamage to the device mayoccur.OperatingRatings indicate conditions forwhich the device is func-
tional, but do not guaranteespecificperformance limits. Electrical Characteristics stateDCandAC electrical specifications under particular testconditions 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 6: For operating at case temperatures above25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance of
=
θ
1.8 ˚C/W (junction to case). Refer to the section, Determining the Correct Heat Sink, in the Application Information section.
JC
Note 7: Human body model, 100 pF discharged through a 1.5 kΩ 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
ferential between V
Note 12: The outputdropout voltage, V
formance Characteristics section.
Note 13: Fora4Ωload, and with
With supplies above
above
in theApplication Information section.
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-
EE
and VEEmust be greater than 14V.
CC
±
±
±
20V will only increase the internal power dissipation, not the possible output power. Increased power dissipation will require a larger heat sink as explained
20V,the LM4701 cannotdeliver more than 22 watts into 4Ω due to current limiting of the outputtransistors. Thus, increasingthe power supply
20V supplies, theLM4701 can delivertypically 22 Wattsof continuous average power per channel with less than 0.1%(THD+N).
#
1.
#
2.
, is the supplyvoltage minus the clipping voltage.Refer to the ClippingVoltagevs. Supply Voltage graph in theTypicalPer-
OD
=
−28V with R
EE
35V to 10V, V
10V to −10V, I
O
=
EE
=
O
=
30V 110 90 dB (min)
=
50 mVrms 7.5 5 MHz (min)
IN
600Ω (Input Referred)
=
S
=
S
=
8Ω, unless otherwise specified. Limits ap-
L
Typical Limit
(Limits)
(Note 9) (Note 10)
−10V to −35V, 110 80 dB (min)
0mA
25Ω
25Ω
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Test Circuit#1 (Note 2) (DC Electrical Test Circuit)
Test Circuit#2 (Note 3) (AC Electrical Test Circuit)
DS100835-3
Bridged Amplifier Application Circuit
FIGURE 2. Bridged Amplifier Application Circuit
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DS100835-4
DS100835-5
Single Supply Application Circuit
FIGURE 3. Single Supply Amplifier Application Circuit
Auxillary Amplifier Application Circuit
DS100835-6
FIGURE 4. Auxillary Amplifier Application Circuit
DS100835-7
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