DESCRIPTION
FEATURES
.HIGH OUTPUT SWINGS, up to j::145V (35821
.LARGE LOAD CURRENTS, up to j::6OmA (35801
.DIFFICUL T TO DAMAGE, automatic thermal shutoff
.REDUCES SOURCE LOADING, 1 O 11 n Input Z
.PRESERVES SYSTEM ACCURACY,
11OdB CM R 2OpA bias current
The 3580 series is the first family of I ntegrated
Circuit operational amplifiers which will provide
output voltage swings of up to ::t 145V .
The monolithic F--ET input stage has low bias currents
(20pA) which minimizes the offset voltages caused by
the bias current and the large resistance normally
associated with high voltage circuits.
The 3580 series is packaged in a TO-3 package which
will dissipate over 3W of power without a heat sink
and 4.5W with a suitable heat sink.
The input stage is protected against overvoltages and
the output stage is protected against short-circuits-
to-ground. A special thermal sensing circuit prevents
damage to the amplifier by automatically shutting
the amplifier down when too much power is being
dissipated.
International Airport Industrial Park -P .0. 8ox 11400 -Tucson. Arizona 85734 -Tel. [6021 746-1111 -Twx: 910-952.1111 .Cable. 88RCORP -Telex: 66-6491
Printed in U.S.A. May, 1987
PDS-313D
@ 1975 Burr-Brown Corporation
TION
) +300VOC
R
O + R
eo = ej [ II
~
~
RO
OPERATION FROM A SINGLE SUPPLY
It may be desirable in some applications to operate the
amplifiers from a single supply. The circuit in Figure 3
illustrates a typical application.
N ote that there are restrictions on the input and output
voltages (ei and e,,) which are necessary in order to keep
the amplifier circuits operating in a linear manner.
It should be noted that when the 3581 and 3582 amplifiers
are operated from a single supply, the output stage, which
is still short-circuit-current limited and thermally
protected, is not protected against short circuits to
ground (the 3580 will still be short circuit protected under
these conditions). When the amplifiers are operated from
a single supply, the voltage across one of the output
transistors is high enough that secondary breakdown is a
consideration. The output current must be limited in
order to prevent damage. This can be done by keeping the
load resistor larger than 5kO for the 3582 and greater
than IkO for the 3581.
R
+10V ~ ej ~ +290V
+5V ~ eo ~ +290V
l21
v
I~+
+
r '
e.
I
t RL- eo
':1;
FIGURE 3. Operation from a Single Supply.
The 3580 family. of integrated circuit high voltage
amplifiers provides performance which previously was
only available in bulky modular packages (see Figures I
and 2). In addition to the smaller size and inherent
reliability, the integrated circuit construction offers other
advantages not normally available in modular or discrete
component units. The amplifiers have thermal sensing
and shut-off circuitry which automatically turns the
amplifier off when the internal temperature reaches
approximately 150°C. This is accomplished by sensing
the substrate temperature and deactivating the input
stage current source when the temperature reaches a
critical level. As this happens, the output load current
limits at a safe value and the amplifier's quiescent current
decreases.
If the cause of the abnormal power dissipation is
continuous (such as a short circuit across the load) the
output current may remain at a low value or oscillate
between two values d-ependi-ng on the amount of power
being dissipated and the heat sink conditions seen by the
amplifier. In either case, the amplifier will not sustain
internal damage and will return to normal operation
within a few seconds after the abnormal condition is
removed.
The incorporation of thermal sensing and shut-off in the
amplifier will allow the use of a smaller heat sink than
would otherwise be required. This is due to the fact that
the amplifier will protect itself and does not require a
massive heat sink for protection under abnormal
conditions.
Another unique feature of the 3580 family is the thorough
testing of the unit receiver. In addition to the normal
tests, all amplifiers are 100% tested for input protection at
the full rated differential voltage ( +v " -V ,( ). Each unit is
also 100% tested for output short circuit to common at
maximum supply voltage.
The 3581 and 3582 have a unique feature that is
important in many high voltage applications. In these
two models the input bias current is virtually independent
of the applied common-mode voltage. This is accom-
plished by the true cascode input stage which keeps the
drain-to-source voltage of the input transistors constant
as the common-mode voltage changes.
ELECTRICAL
Typical at TCASE = -:
25°C max unless otherwise note~
MODELS
I POWER SUPPLY
I Voltage. :!:Vcc
3580J
3581J
3582J
ISVDC to
c3SVDC
J::10mA
:32VDC ta
:!:75VDC
:!:8mA
!:70VDC to
:!:150VDC
:!:65mA
I Quiescent Current. max
i RATED OUTPUT
I Voltage. :!:'iVCCI -5 \,- -
DC,min IOVDC to
:30VDC
J:60mA
:100mA
:27VDC to
:!:7OVDC
:!:3OmA
:!:SOmA
1OnF
;:65VDC to
:!:145VDC
:!:15mA
:!:25mA
Current, min
Current, Short Circuit
~pacitance, max
i OPEN-LOO~
106dB
86dB
112dB
94dB
118dB
100dB
No Load. DC
Rated Load. DC. min
FREOUENCYRESPONSE
Unity Gain Bandwidth. Small Signal
Full Power Bandwidth
Slew Rate
SettlinqTime.O.1%
SMHz. min
60kHz
20V/!ls
12!ls
100kHz
15V/IJs
30kHz
20V/,,5
~ INPUT OFFSET VOl TAGE
Initial at TCASE = +25°C. max
Drift vs Temp, max
Drift vs Supply Voltage
Drift vs Time
:!:10mV
:!:30IJV/OC
100IJV/V
100IJV/mc
:!:3mV
:!:25IJV/OC
20IJVN
50IJV/mo
:t3mV
12S}lV/OC
20}lV/V
SO}lV/mo
I INPUT BIAS CURRENT
-50pA I -20pA
doubles every 10°C
02pA/V
20pA
Initial at ICASE = +25°C. max
Drift vs Temp
Drift vs Supply Voltage
O.5pA/\t
02pA/v
rlNPUT OFFSET CURRENT
I :!:20pA
doubles every 10oC
02pA/V
OSpA/V
02pA/V
Initial at TCASE = +25°C. max
Drift vs Temp
Drift vs Supply Voltage
INPUT IMPEDANCE
Differential
Common-mode
INPUT NOISE
Voltage 001 Hz to 10Hz. p-p
10Hzto1kHz. rms
Current 001Hz to 10Hz. p-p
INPUT VOlTAGE RANGE
Max Safe Differential Voltage(1)
Max Safe Common-mode Voltage
Common-mode Voltage. Linear
Operation
Common-mode Rejection
TEMPERATURE Case
Specification
Operating
Storage
1011!110pF
101111
SIJV
17IJV
03pA
17IJV
03pA
1!JV
1pA
-vcc
;0 -VCr:
-VD
+V{
Vcc -10 v
110dB
Vcc -10
110dB
Vcc -!1 v
86dB
0°C to 70°C
.55°C to +125°C
55°C to +150°C
NOTE.
1 On Models 3581 and 3582 the inputs may be damaged by pulses at pins 5 or 6 with
dV /dt?1 V /nsl. Any possible damage can be eliminated by limiting the input current to 150mA
with external resistors in series with those pins. No external protection is needed for slower
voltage
The information provided herein is believed to be reliable; however,
BURR-BROWN assumes no responsibility for inaccuracies or omissions.
BURR-BROWN assumes no responsibility for the use of this information,
and all use of such information shall be entirely at the user's own risk.
Prices and specifications are subject to change without notice. No patent
rights or licenses to any of the circuits described herein are implied or
granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
