LM1875-MWC National Semiconductor Corporation, LM1875-MWC Datasheet

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LM1875-MWC

Manufacturer Part Number
LM1875-MWC
Description
20w Audio Power Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet
© 2002 National Semiconductor Corporation
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
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 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
internally compensated and stable for gains of 10 or greater.
Connection Diagram
For Straight Leads
For Stagger Bend
For 90˚ Stagger
Bend
For 90˚ Stagger
Bend
Package
Front View
Ordering Info
SL108949
LM1875T
LM1875T
LM1875T
LM1875T
LB03
LB05
LB02
±
30V supplies, over 30
DS005030
00503001
NSC Package
Number
TA05B
T05A
T05D
T05E
±
25V
Features
n Up to 30 watts output power
n A
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
VO
typically 90 dB
www.national.com
July 2002
00503002

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LM1875-MWC Summary of contents

Page 1

... 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 30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components ...

Page 2

Absolute Maximum Ratings Supply Voltage Input Voltage Storage Temperature Junction Temperature Electrical Characteristics V =+25V, −V =−25V, T =25˚ AMBIENT Parameter Supply Current Output Power (Note 2) THD (Note 2) Offset Voltage Input Bias Current Input Offset ...

Page 3

Typical Performance Characteristics THD vs Power Output Power Output vs Supply Voltage PSRR vs Frequency 00503009 Supply Current vs Supply 00503011 00503013 φINTERFACE = 1˚C/W. † See Application Hints. 3 THD vs Frequency 00503010 Voltage 00503012 Device Dissipation vs Ambient ...

Page 4

Typical Performance Characteristics Power Dissipation vs Power Output -Current Limit/ OUT OUT Safe Operating Area Boundary Input Bias Current vs Supply Voltage www.national.com (Continued) 00503015 00503017 Note 3: Thermal shutdown with infinite heat sink Note 4: Thermal ...

Page 5

5 www.national.com ...

Page 6

... Most power amplifiers do not drive highly capacitive loads well, and the LM1875 is no exception. If the output of the LM1875 is connected directly to a capacitor with no series resistance, the square wave response will exhibit ringing if the capacitance is greater than about 0.1 µ ...

Page 7

... Note: When using a single supply, maximum transfer of heat away from the LM1875 can be achieved by mounting the device directly to the heat sink (tab is at ground potential); this avoids the use of a mica or other type insulator. ...

Page 8

Component Layouts www.national.com Split Supply 00503006 Single Supply 00503007 8 ...

Page 9

... Physical Dimensions inches (millimeters) unless otherwise noted TO-220 Power Package (T) Order Number LM1875T NS Package Number T05D Order Number LM1875T SL108949 NS Package Number T05A 9 www.national.com ...

Page 10

... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) Order Number LM1875T LB05 NS Package Number T05E 10 ...

Page 11

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted (Continued) Order Number LM1875T LB02 NS Package Number TA05B 2 ...

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