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LM675T Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No. de pieza LM675T
Descripción Electrónicos  Power Operational Amplifier
Download  8 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM675T Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Application Hints (Continued)
ample, we assume a lubricated mica insulator between the
LM675 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 restricted 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.
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 will be roughly that of the same amplifier
driving the resistive part of that load. For example, some re-
active loads may at some frequency have an impedance
with a magnitude of 8
Ω and a phase angle of 60˚. The real
part of this load will then be 8
Ω x cos 60˚ or 4Ω, and the am-
plifier power dissipation will roughly follow the curve of power
dissipation with a 4
Ω load.
Typical Applications
Non-Inverting Unity Gain Operation
DS006739-6
Inverting Unity Gain Operation
DS006739-7
www.national.com
6


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