National Semiconductor LM1875 Technical data
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LM1875
20W Audio Power Amplifier
LM1875 20W Audio Power Amplifier
July 2002
General Description
The LM1875 is a monolithic power amplifier offering very low
distortion and high quality performance for consumer audio
applications.
±
The LM1875 delivers 20 watts into a 4Ω or 8Ω load on
supplies. Using an 8Ω load and
watts of power may be delivered. The amplifier is designed
to operate with a minimum of external components. Device
overload protection consists of both internal current limit and
thermal shutdown.
The LM1875 design takes advantage of advanced circuit
techniques and processing to achieve extremely low distortion levels even at high output power levels. Other outstanding features include high gain, fast slew rate and a wide
power bandwidth, large output voltage swing, high current
capability, and a very wide supply range. The amplifier is
internally compensated and stable for gains of 10 or greater.
±
30V supplies, over 30
25V
Connection Diagram
Features
n Up to 30 watts output power
n A
typically 90 dB
VO
n Low distortion: 0.015%, 1 kHz, 20 W
n Wide power bandwidth: 70 kHz
n Protection for AC and DC short circuits to ground
n Thermal protection with parole circuit
n High current capability: 4A
n Wide supply range 16V-60V
n Internal output protection diodes
n 94 dB ripple rejection
n Plastic power package TO-220
Applications
n High performance audio systems
n Bridge amplifiers
n Stereo phonographs
n Servo amplifiers
n Instrument systems
Typical Applications
Front View
Package Ordering Info
For Straight Leads LM1875T
SL108949
For Stagger Bend LM1875T
LB03
For 90˚ Stagger
Bend
For 90˚ Stagger
Bend
LM1875T
LB05
LM1875T
LB02
00503001
NSC Package
Number
T05A
T05D
T05E
TA05B
00503002
© 2002 National Semiconductor Corporation DS005030 www.national.com
Absolute Maximum Ratings (Note 1)
LM1875
Supply Voltage 60V
Input Voltage −V
Storage Temperature −65˚C to + 150˚C
to V
EE
CC
Lead Temperature
(Soldering, 10 seconds) 260˚C
θ
JC
θ
JA
Junction Temperature 150˚C
Electrical Characteristics
VCC=+25V, −VEE=−25V, T
Parameter Conditions Typical Tested Limits Units
Supply Current P
Output Power (Note 2) THD=1% 25 W
THD (Note 2) P
Offset Voltage
Input Bias Current
Input Offset Current 0
Gain-Bandwidth Product f
Open Loop Gain DC 90 dB
PSRR V
Max Slew Rate 20W, 8Ω, 70 kHz BW 8 V/µs
Current Limit V
Equivalent Input Noise Voltage R
Note 1: “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.
Note 2: Assumes the use of a heat sink having a thermal resistance of 1˚C/W and no insulator with an ambient temperature of 25˚C. Because the output limiting
circuitry has a negative temperature coefficient, the maximum output power delivered to a 4Ω load may be slightly reduced when the tab temperature exceeds 55˚C.
=25˚C, RL=8Ω,AV=20 (26 dB), fo=1 kHz, unless otherwise specified.
AMBIENT
=0W 70 100 mA
OUT
=20W, fo=1 kHz 0.015 %
OUT
P
=20W, fo=20 kHz 0.05 0.4 %
OUT
P
=20W, RL=4Ω,fo=1 kHz 0.022 %
OUT
P
=20W, RL=4Ω,fo=20 kHz 0.07 0.6 %
OUT
±
1
±
0.2
=20 kHz 5.5 MHz
o
, 1 kHz, 1 Vrms 95 52 dB
CC
V
, 1 kHz, 1 Vrms 83 52 dB
EE
OUT=VSUPPLY
=600Ω, CCIR 3 µVrms
S
−10V 4 3 A
±
15 mV
±
2µA
±
0.5 µA
3˚C
73˚C
Typical Applications
Typical Single Supply Operation
00503003
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Typical Performance Characteristics
THD vs Power Output THD vs Frequency
00503009 00503010
LM1875
Power Output vs Supply
Voltage
PSRR vs Frequency
Supply Current vs Supply
Voltage
00503011 00503012
Device Dissipation vs
Ambient Temperature
†
00503013
†
φINTERFACE = 1˚C/W.
See Application Hints.
00503014
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Typical Performance Characteristics (Continued)
LM1875
Power Dissipation vs
Power Output
00503015 00503016
I
OUT
vs V
-Current Limit/
OUT
Safe Operating Area Boundary
Power Dissipation vs
Power Output
Open Loop Gain and
Phase vs Frequency
Input Bias Current
vs Supply Voltage
00503017
00503019
Note 3: Thermal shutdown with infinite heat sink
00503018
Note 4: Thermal shutdown with 1˚C/W heat sink
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