LM1875T/LF05 National Semiconductor, LM1875T/LF05 Datasheet

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LM1875T/LF05

Manufacturer Part Number
LM1875T/LF05
Description
20W AUDIO POWER AMP
Manufacturer
National Semiconductor
Datasheet

Specifications of LM1875T/LF05

Operational Class
Class-AB
Audio Amplifier Output Configuration
1-Channel Mono
Output Power (typ)
25x1@8OhmW
Audio Amplifier Function
Speaker
Input Offset Voltage
15@±25VmV
Total Harmonic Distortion
0.015@8Ohm@20W%
Single Supply Voltage (typ)
18/24/28V
Dual Supply Voltage (typ)
V
Supply Current (max)
100@±25VmA
Power Supply Requirement
Single/Dual
Unity Gain Bandwidth Product (typ)
5.5MHz
Rail/rail I/o Type
No
Power Supply Rejection Ratio
95dB
Single Supply Voltage (min)
16V
Single Supply Voltage (max)
60V
Dual Supply Voltage (min)
±8V
Dual Supply Voltage (max)
±30V
Mounting
Through Hole
Pin Count
5 +Tab
Package Type
TO-220
Lead Free Status / Rohs Status
Compliant
© 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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LM1875T/LF05 Summary of contents

Page 1

... LM1875T LB03 For 90˚ Stagger LM1875T Bend LB05 For 90˚ Stagger LM1875T Bend LB02 © 2002 National Semiconductor Corporation Features watts output power n A typically Low distortion: 0.015%, 1 kHz ± 25V n Wide power bandwidth: 70 kHz n Protection for AC and DC short circuits to ground ...

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

Application Hints STABILITY The LM1875 is designed to be stable when operated at a closed-loop gain greater, but, as with any other high-current amplifier, the LM1875 can be made to oscillate under certain conditions. These usually involve ...

Page 7

Application Hints (Continued) output stage and constant power dissipation in all other parts of the circuit. The curves of “Power Dissipation vs Power Output” give a better representation of the behavior of the LM1875 with various power supply voltages and ...

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’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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