LM143,LM343
LM143/LM343 High Voltage Operational Amplifier
Literature Number: SNVS759
LM143/LM343
High Voltage Operational Amplifier
General Description
The LM143 is a general purpose high voltage operational
amplifier featuring operation to ±40V, complete input over-
voltage protection up to ±40V and input currents compa-
rable to those of other super-βop amps. Increased slew rate,
together with higher common-mode and supply rejection, in-
sure improved performance at high supply voltages. Operat-
ing characteristics, in particular supply current, slew rate and
gain, are virtually independent of supply voltage and tem-
perature. 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 environments 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
nWide supply voltage range: ±4.0V to ±40V
nLarge output voltage swing: ±37V
nWide input common-mode range: ±38V
nInput overvoltage protection: Full ±40V
nSupply current is virtually independent of supply voltage
and temperature
Unique Characteristics
nLow input bias current: 8.0 nA
nLow input offset current: 1.0 nA
nHigh slew rate—essentially independent of temperature
and supply voltage: 2.5V/µs
nHigh voltage gain—virtually independent of resistive
loading, temperature, and supply voltage: 100k min
nInternally compensated for unity gain
nOutput short circuit protection
nPin compatible with general purpose op amps
Connection Diagram
Metal Can Package
Top View
DS007783-1
*Available per SMD#7800303
Order Number LM143H, LM143H/883*or LM343H
See NS Package Number H08C
July 1992
LM143/LM343 High Voltage Operational Amplifier
LM143/LM343
© 1998 National Semiconductor Corporation DS007783 www.national.com 1
PrintDate=1998/05/21 PrintTime=11:17:12 41268 ds007783 Rev. No. 3 cmserv Proof 1
Absolute Maximum Ratings (Notes 1, 4)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
LM143 LM343
Supply Voltage ±40V ±34V
Power Dissipation (Note 1) 680 mW 680 mW
Differential Input Voltage (Note 2) 80V 68V
Input Voltage (Note 2) ±40V ±34V
Operating Temperature Range −55˚C to +125˚C 0˚C to +70˚C
Storage Temperature Range −65˚C to +150˚C −65˚C to +150˚C
Output Short Circuit Duration 5 seconds 5 seconds
Lead Temperature (Soldering, 10 sec.) 300˚C 300˚C
ESD rating to be determined.
Electrical Characteristics (Note 3)
Parameter Conditions LM143 LM343 Units
Min Typ Max Min Typ Max
Input Offset Voltage T
A
=25˚C 2.0 5.0 2.0 8.0 mV
Input Offset Current T
A
=25˚C 1.0 3.0 1.0 10 nA
Input Bias Current T
A
=25˚C 8.0 20 8.0 40 nA
Supply Voltage T
A
=25˚C 10 100 10 200 µV/V
Rejection Ratio
Output Voltage Swing T
A
=25˚C, R
L
≥5kΩ22 25 20 25 V
Large Signal Voltage T
A
=25˚C, V
OUT
=±10V, 100k 180k 70k 180k V/V
Gain R
L
≥100 kΩ
Common-Mode T
A
=25˚C 80 90 70 90 dB
Rejection Ratio
Input Voltage Range T
A
=25˚C ±24 ±26 ±22 ±26 V
Supply Current (Note 5) T
A
=25˚C 2.0 4.0 2.0 5.0 mA
Short Circuit Current T
A
=25˚C 20 20 mA
Slew Rate T
A
=25˚C, A
V
=1 2.5 2.5 V/µs
Power Bandwidth T
A
=25˚C, V
OUT
=40 V
p-p
, 20k 20k Hz
R
L
=5kΩ, THD ≤1%
Unity Gain Frequency T
A
=25˚C 1.0M 1.0M Hz
Input Offset Voltage T
A
=Max 6.0 10 mV
T
A
=Min 6.0 10
Input Offset Current T
A
=Max 0.8 4.5 0.8 14 nA
T
A
=Min 1.8 7.0 1.8 14
Input Bias Current T
A
=Max 5.0 35 5.0 55 nA
T
A
=Min 16 35 16 55
Large Signal Voltage R
L
≥100 kΩ,T
A
=Max 50k 150k 50k 150k V/V
Gain R
L
≥100 kΩ,T
A
=Min 50k 220k 50k 220k
Output Voltage Swing R
L
≥5.0 kΩ,T
A
=Max 22 26 20 26 V
R
L
≥5.0 kΩ,T
A
=Min 22 25 20 25
Note 1: Absolute maximum ratings are not necessarily concurrent, and care must be taken not to exceed the maximum junction temperature of the LM143 (150˚C)
or the LM343 (100˚C). For operating at elevated temperatures, devices in the H08 package must be derated based on a thermal resistance of 155˚C/W, junction to
ambient, or 20˚C/W, junction to case.
Note 2: For supply voltage less than ±40V for the LM143 and less than ±34V for the LM343, the absolute maximum input voltage is equal to the supply voltage.
Note 3: These specifications apply for VS=±28V. For LM143, TA=max =125˚C and TA=min =−55˚C. For LM343, TA=max =70˚C and TA=min =0˚C.
Note 4: Refer to RETS143X for LM143H and LM1536H military specifications.
Note 5: The maximum supply currents are guaranteed at VS=±40V for the LM143 and VS=±34V for the LM343.
PrintDate=1998/05/21 PrintTime=11:17:12 41268 ds007783 Rev. No. 3 cmserv Proof 2
www.national.com 2
Schematic Diagram
DS007783-2
3 www.national.com
PrintDate=1998/05/21 PrintTime=11:17:12 41268 ds007783 Rev. No. 3 cmserv Proof 3
Typical Performance Characteristics
Voltage Follower Slew Rate
DS007783-15
Supply Current
DS007783-16
Short Circuit Current
DS007783-17
Unity Gain Bandwidth
DS007783-18
Input Noise Voltage
DS007783-19
Input Noise Current
DS007783-20
Common-Mode Rejection
DS007783-21
Power Supply Rejection
DS007783-35
Large Signal Frequency
Response
DS007783-22
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www.national.com 4
Typical Performance Characteristics (Continued)
Application Hints (See AN-127)
The LM143 is designed for trouble free operation at any sup-
ply voltage up to and including the guaranteed maximum of
±40V. Input overvoltage protection, both common-mode and
differential, is 100%tested and guaranteed at the maximum
supply voltage. Furthermore, all possible high voltage de-
structive 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 ex-
cessive current, fusing the internal aluminum interconnects.
Voltage reversal between the power supplies will almost al-
ways result in a destroyed unit.
Open Loop Frequency
Response
DS007783-23
Voltage Follower Pulse
Response
DS007783-24
Inverter Pulse Response
DS007783-25
Input Voltage Range
DS007783-26
Output Voltage Swing
DS007783-27
Voltage Gain
DS007783-28
Supply Current
DS007783-29
Input Current
DS007783-30
Voltage Gain
DS007783-31
5 www.national.com
PrintDate=1998/05/21 PrintTime=11:17:13 41268 ds007783 Rev. No. 3 cmserv Proof 5
Application Hints (See AN-127) (Continued)
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 taken
to prevent the magnitude of the PC board leakage currents,
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 voltages. To pre-
vent this, PC boards should be properly cleaned and coated
to prevent contamination and to provide protection from con-
densed water vapor when operating below 0˚C. A guard ring
is also recommended to significantly reduce leakage cur-
rents from the op amp input pins to the adjacent high voltage
pins in the standard op amp pin connection as shown in
Fig-
ure 1
.
Figures 2, 3, 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 presented
in the following section emphasize those applications which
take advantage of the unique high voltage abilities of the
LM143.
DS007783-5
Bottom View
FIGURE 1. Printed Circuit Layout for Input
Guarding with TO-5 Package
DS007783-6
R1 =RSOURCE
FIGURE 2. Guarded Voltage Follower
DS007783-7
FIGURE 3. Guarded Non-Inverting Amplifier
DS007783-8
FIGURE 4. Guarded Inverting Amplifier
DS007783-14
FIGURE 5. Offset Voltage Adjustment
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www.national.com 6
Typical Applications (Note 6) (For more detail see AN-127)
130 V
p-p
Drive Across a Floating Load
DS007783-9
±34V Common-Mode Instrumentation Amplifier
DS007783-10
*R2 may be adjustable to trim the gain.
** R7 may be adjusted to compensate for the resistance tolerance of R4–R7 for best CMR.
Note 6: The 38V supplies allow for a 5%voltage tolerance. All resistors are
1
⁄
2
watt, except as noted.
7 www.national.com
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Typical Applications (Note 6) (For more detail see AN-127) (Continued)
Tracking ±65V, 1 Amp Power Supply with Short Circuit Protection
DS007783-11
†Put on common heat sink.
All resistors are
1
⁄
2
watt, 5%, except as noted.
PrintDate=1998/05/21 PrintTime=11:17:13 41268 ds007783 Rev. No. 3 cmserv Proof 8
www.national.com 8
Typical Applications (Note 6) (For more detail see AN-127) (Continued)
90W Audio Power Amplifier with Safe Area Protection
DS007783-12
†Put on common heat sink
*34 turns of no. 20 wire on a
3
⁄
8
" form
** Adjust R6 to set IQ=100 mA
9 www.national.com
PrintDate=1998/05/21 PrintTime=11:17:13 41268 ds007783 Rev. No. 3 cmserv Proof 9
Book
Extract
End
Typical Applications (Note 6) (For more detail see AN-127) (Continued)
1 Amp Power Amplifier with Short Circuit Protection
DS007783-13
PrintDate=1998/05/21 PrintTime=11:17:13 41268 ds007783 Rev. No. 3 cmserv Proof 10
Book
Extract
End
www.national.com 10
THIS PAGE IS IGNORED IN THE DATABOOK
11
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11
Physical Dimensions inches (millimeters) unless otherwise noted
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Metal Can Package (H)
Order Number LM143H, LM143H/883 or LM343H
NS Package Number H08C
LM143/LM343 High Voltage Operational Amplifier
PrintDate=1998/05/21 PrintTime=11:17:13 41268 ds007783 Rev. No. 3 cmserv Proof 12
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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