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LM1875 데이터시트 PDF




National Semiconductor에서 제조한 전자 부품 LM1875은 전자 산업 및 응용 분야에서
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부품번호 LM1875 기능
기능 20W Audio Power Amplifier
제조업체 National Semiconductor
로고 National Semiconductor 로고


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LM1875 데이터시트, 핀배열, 회로
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 4or 8load on ±25V
supplies. Using an 8load 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
n Up to 30 watts output power
n AVO typically 90 dB
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
Connection Diagram
Typical Applications
Front View
DS005030-1
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
NSC Package
Number
T05A
T05D
T05E
TA05B
DS005030-2
© 1999 National Semiconductor Corporation DS005030
www.national.com




LM1875 pdf, 반도체, 판매, 대치품
Typical Performance Characteristics (Continued)
Open Loop Gain and
Phase vs Frequency
Input Bias Current
vs Supply Voltage
Note 3: Thermal shutdown with infinite heat sink
Note 4: Thermal shutdown with 1˚C/W heat sink
DS005030-18
DS005030-19
www.national.com
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LM1875 전자부품, 판매, 대치품
Application Hints (Continued)
put stage and constant power dissipation in all other parts of
the circuit. The curves of “Power Dissipation vs Power Out-
put” give a better representation of the behavior of the
LM1875 with various power supply voltages and resistive
loads. As an example, if the LM1875 is operated on a 50V
power supply with a resistive load of 8, it can develop up to
19W of internal power dissipation. If the die temperature is to
remain below 150˚C for ambient temperatures up to 70˚C,
the total junction-to-ambient thermal resistance must be less
than
Using θJC=2˚C/W, the sum of the case-to-heat-sink interface
thermal resistance and the heat-sink-to-ambient thermal re-
sistance must be less than 2.2˚C/W. The case-to-heat-sink
thermal resistance of the TO-220 package varies with the
mounting method used. A metal-to-metal interface will be
about 1˚C/W if lubricated, and about 1.2˚C/W if dry.
If a mica insulator is used, the thermal resistance will be
about 1.6˚C/W lubricated and 3.4˚C/W dry. For this example,
we assume a lubricated mica insulator between the LM1875
and the heat sink. The heat sink thermal resistance must
then be less than
4.2˚C/W−2˚C/W−1.6˚C/W=0.6˚C/W.
This is a rather large heat sink and may not be practical in
some applications. If a smaller heat sink is required for rea-
sons of size or cost, there are two alternatives. The maxi-
mum ambient operating temperature can be reduced to 50˚C
(122˚F), resulting in a 1.6˚C/W heat sink, or the heat sink can
be isolated from the chassis so the mica washer is not
needed. This will change the required heat sink to a 1.2˚C/W
unit if the case-to-heat-sink interface is lubricated.
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.
The thermal requirements can become more difficult when
an amplifier is driving a reactive load. For a given magnitude
of load impedance, a higher degree of reactance will cause
a higher level of power dissipation within the amplifier. As a
general rule, the power dissipation of an amplifier driving a
60˚ reactive load (usually considered to be a worst-case
loudspeaker load) will be roughly that of the same amplifier
driving the resistive part of that load. For example, a loud-
speaker may at some frequency have an impedance with a
magnitude of 8and a phase angle of 60˚. The real part of
this load will then be 4, and the amplifier power dissipation
will roughly follow the curve of power dissipation with a 4
load.
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