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LM143H bảng dữ liệu(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LM143H
Giải thích chi tiết về linh kiện  High Voltage Operational Amplifier
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Typical Performance Characteristics (Continued)
Input Voltage Range
Output Voltage Swing
Voltage Gain
Supply Current
Input Current
Voltage Gain
TLH7783 – 3
Application Hints (See AN-127)
The LM143 is designed for trouble free operation at any
supply voltage up to and including the guaranteed maximum
of g40V Input overvoltage protection both common-mode
and differential is 100% tested and guaranteed at the maxi-
mum supply voltage Furthermore all possible high voltage
destructive modes during supply voltage turn-on have been
eliminated by design As with most IC op amps however
certain precautions should be observed to insure that the
LM143 remains virtually blow-out proof
Although output short circuits to ground or either supply can
be sustained indefinitely at lower supply voltages these
short circuits should be of limited duration when operating at
higher supply voltages Units can be destroyed by any com-
bination of high ambient temperature high supply voltages
and high power dissipation which results in excessive die
temperature This is also true when driving low impedance
or reactive loads or loads that can revert to low impedance
for example the LM143 can drive most general purpose op
amps outside of the maximum input voltage range causing
heavy current to flow and possibly destroying both devices
Precautions should be taken to insure that the power sup-
plies never become reversed in polarityeven under tran-
sient conditions With reverse voltage the IC will conduct
excessive current fusing the internal aluminum intercon-
nects Voltage reversal between the power supplies will al-
most always result in a destroyed unit
In high voltage applications which are sensitive to very low
input currents special precautions should be exercised For
example with high source resistances care should be tak-
en to prevent the magnitude of the PC board leakage cur-
rents although quite small from approaching those of the
op amp input currents These leakage currents become
larger at 125 C and are made worse by high supply volt-
ages
To prevent this
PC boards should be properly
cleaned and coated to prevent contamination and to pro-
vide protection from condensed water vapor when operat-
ing below 0 C A guard ring is also recommended to signifi-
cantly reduce leakage currents from the op amp input pins
to the adjacent high voltage pins in the standard op amp pin
connection as shown in
Figure 1 Figures 2 3 and 4 show
how the guard ring is connected for the three most common
op amp configurations
Finally caution should be exercised in high voltage applica-
tions as electrical shock hazards are present Since the
negative supply is connected to the case users may inad-
vertantly contact voltages equal to those across the power
supplies
The LM143 can be used as a plug-in replacement in most
general purpose op amp applications The circuits present-
ed in the following section emphasize those applications
which take advantage of the unique high voltage abilities of
the LM143
5


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