LM1875 20W Audio Power Amplifier
February 1999
LM1875
20W Audio Power Amplifier
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
±
25V
supplies. Using an 8Ω load and
±
30V supplies, over 30
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 distor-
tion levels even at high output power levels. Other outstand-
ing 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 in-
ternally compensated and stable for gains of 10 or greater.
Features
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Up to 30 watts output power
A
VO
typically 90 dB
Low distortion: 0.015%, 1 kHz, 20 W
Wide power bandwidth: 70 kHz
Protection for AC and DC short circuits to ground
Thermal protection with parole circuit
High current capability: 4A
Wide supply range 16V-60V
Internal output protection diodes
94 dB ripple rejection
Plastic power package TO-220
Applications
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High performance audio systems
Bridge amplifiers
Stereo phonographs
Servo amplifiers
Instrument systems
Connection Diagram
Typical Applications
DS005030-1
Front View
NSC Package
Number
T05A
T05D
T05E
TA05B
Package
For Straight Leads
For Stagger Bend
For 90˚ Stagger Bend
For 90˚ Stagger Bend
Ordering Info
LM1875T
SL108949
LM1875T
LB03
LM1875T
LB05
LM1875T
LB02
DS005030-2
© 1999 National Semiconductor Corporation
DS005030
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
