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PDF LM343 Data sheet ( Hoja de datos )
| Número de pieza | LM343 | |
| Descripción | High Voltage Operational Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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February 1995
LM143 LM343 High Voltage
Operational Amplifier
General Description
The LM143 is a general purpose high voltage operational
amplifier featuring operation to g40V complete input over-
voltage protection up to g40V and input currents compara-
ble to those of other super-b op amps Increased slew rate
together with higher common-mode and supply rejection
insure improved performance at high supply voltages Oper-
ating characteristics in particular supply current slew rate
and gain are virtually independent of supply voltage and
temperature Furthermore gain is unaffected by output
loading at high supply voltages due to thermal symmetry on
the die The LM143 is pin compatible with general purpose
op amps and has offset null capability
Application areas include those of general purpose op
amps but can be extended to higher voltages and higher
output power when externally boosted For example when
used in audio power applications the LM143 provides a
power bandwidth that covers the entire audio spectrum In
addition the LM143 can be reliably operated in environ-
ments with large overvoltage spikes on the power supplies
where other internally-compensated op amps would suffer
catastrophic failure
The LM343 is similar to the LM143 for applications in less
severe supply voltage and temperature environments
Features
Y Wide supply voltage range
g4 0V to g40V
Y Large output voltage swing
g37V
Y Wide input common-mode range
g38V
Y Input overvoltage protection
Full g40V
Y Supply current is virtually independent of supply voltage
and temperature
Unique Characteristics
Y Low input bias current
8 0 nA
Y Low input offset current
1 0 nA
Y High slew rate essentially independent of temperature
and supply voltage
2 5V ms
Y High voltage gain virtually independent of resistive
loading temperature and supply voltage
100k min
Y Internally compensated for unity gain
Y Output short circuit protection
Y Pin compatible with general purpose op amps
Connection Diagram
Metal Can Package
Top View
TL H 7783 – 1
Order Number LM143H LM143H 883 or LM343H
See NS Package Number H08C
Available per SMD 7800303
C1995 National Semiconductor Corporation TL H 7783
RRD-B30M115 Printed in U S A
1 page  
Typical Performance Characteristics (Continued)
Input Voltage Range
Output Voltage Swing
Voltage Gain
Supply Current
Input Current
Voltage Gain
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 polarity even 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
TL H 7783 – 3
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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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM343.PDF ] | |
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