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1
FEATURES
WIDE SUPPLY RANGE -- 15V to 150V
PROGRAMMABLE OUTPUT CURRENT LIMIT
HIGH OUTPUT CURRENT -- Up to 150mA
LOW BIAS CURRENT -- FET Input
APPLICATIONS
HIGH VOLTAGE INSTRUMENTATION
ELECTROSTATIC TRANSDUCERS & DEFLECTION
PROGRAMMABLE POWER SUPPLIES UP TO 290V
ANALOG SIMULATORS
DESCRIPTION
The PA08 is a high voltage operational amplifier designed
for output voltage swings of up to 145V with a dual () sup-
ply or 290V with a single supply. High accuracy is achieved
with a cascode input circuit configuration. All internal biasing
is referenced to a zener diode fed by a FET constant current
source. As a result, the PA08 features an unprecedented sup-
ply range and excellent supply rejection. The output stage is
biased-on for linear operation. Internal phase compensation
assures stability at all gain settings. The safe operating area
(SOA) can be observed with all types of loads by choosing
the appropriate current limiting resistors. For operation into
inductive loads, two external flyback pulse protection diodes
are recommended. A heatsink may be necessary to maintain
the proper case temperature under normal operating condi-
tions.
This hybrid integrated circuit utilizes beryllia (BeO) substrate,
thick film resistors, ceramic capacitors and semiconductor chips
to maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable inter-
connections at all operating temperatures. The 8-pin TO-3
package is hermetically sealed and electrically isolated. The
use of compressible thermal isolation washers and/or improper
mounting torque will void the product warranty. Please see
"General Operating Considerations".
EQUIVALENT SCHEMATIC
TYPICAL APPLICATION
ATE PIN DRIVER
The PA08 as a pin driver is capable of supplying high test
voltages to a device under test (DUT). Due to the possibility
of short circuits to any terminal of the DUT, current limit must
be set to be safe when limiting with a supply to output volt-
age differential equal to the amplifier supply plus the largest
magnitude voltage applied to any other pin of the DUT. In
addition, flyback diodes are recommended when the output of
the amplifier exits any equipment enclosure to prevent damage
due to electrostatic discharges. Refer to Application Note 7
for details on accuracy considerations of this circuit.
EXTERNAL CONNECTIONS
8-PIN TO-3
PACKAGE STYLE CE
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
2
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
to V
S
300V
OUTPUT CURRENT, within SOA
200mA
POWER DISSIPATION, internal at T
C
= 25C
17.5W
INPUT VOLTAGE, differential
50V
INPUT VOLTAGE, common mode
V
S
TEMPERATURE, pin solder - 10s max
300C
TEMPERATURE, junction
1
175C
TEMPERATURE RANGE, storage
65 to +150C
OPERATING TEMPERATURE RANGE, case
55 to +125C
PA08
PA08A
PARAMETER
TEST CONDITIONS
2
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
INPUT
OFFSET VOLTAGE, initial
T
C
= 25C
.5
2
.25
.5
mV
OFFSET VOLTAGE, vs. temperature
T
C
= 25C to +85C
15
30
5
10
V/C
OFFSET VOLTAGE, vs. supply
T
C
= 25C
.5
*
2
V/V
OFFSET VOLTAGE, vs. time
T
C
= 25C
75
*
V/kh
BIAS CURRENT, initial
3
T
C
= 25C
5
50
3
10
pA
BIAS CURRENT, vs. supply
T
C
= 25C
.01
*
pA/V
OFFSET CURRENT, initial
3
T
C
= 25C
2.5
50
1.5
10
pA
INPUT IMPEDANCE, DC
T
C
= 25C
10
5
*
M
INPUT CAPACITANCE
T
C
= 25C
4
*
pF
COMMON MODE VOLTAGE RANGE
4
T
C
= 25C to +85C
V
S
10
*
V
COMMON MODE REJECTION, DC
T
C
= 25C to +85C, V
CM
= 90V
130
*
dB
GAIN
OPEN LOOP GAIN at 10Hz
T
C
= 25C, R
L
=
118
*
dB
OPEN LOOP GAIN at 10Hz
T
C
= 25C, R
L
= 1.2K
96
111
*
*
dB
GAIN BANDWIDTH PRODUCT at 1MHz T
C
= 25C, R
L
= 1.2K
5
*
MHz
POWER BANDWIDTH
T
C
= 25C, R
L
= 1.2K
90
*
kHz
PHASE MARGIN
T
C
= 25 to +85C
60
*
OUTPUT
VOLTAGE SWING
4
T
C
= 25C, I
O
= 150mA
V
S
15 V
S
8
*
*
V
VOLTAGE SWING
4
T
C
= 25
o
C to +85
o
C, I
O
= 75mA
V
S
10 V
S
5
*
*
V
VOLTAGE SWING
4
T
C
= 25
o
C to +85
o
C, I
O
= 20mA
V
S
5 V
S
3
*
*
V
CURRENT, peak
T
C
= 85C
150
*
mA
SLEW RATE
T
C
= 25C
30
20
*
V/s
CAPACITIVE LOAD, A
V
= 1
T
C
= 25 to +85C
10
*
nF
CAPACITIVE LOAD, A
V
> 4
T
C
= 25 to +85C
SOA
*
SETTLING TIME to .1%
T
C
= 25C, R
L
= 1.2K, 2V step
1
*
s
POWER SUPPLY
VOLTAGE
T
C
= 55 to +125C
15
100
150
*
*
*
V
CURRENT, quiescent
T
C
= 25C
6
8.5
*
*
mA
THERMAL
RESISTANCE, AC junction to case
5
T
C
= 55 to +125C, F > 60Hz
4.26
*
C/W
RESISTANCE, DC junction to case
T
C
= 55 to +125C, F < 60Hz
6.22
8.57
*
*
C/W
RESISTANCE, junction to air
T
C
= 55 to +125C
30
*
C/W
TEMPERATURE RANGE, case
Meets full range specification
25
85
*
*
C
PA08 PA08A
NOTES: * The specification of PA08A is identical to the specification for PA08 in applicable column to the left.
1. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve
high MTTF.
2. The power supply voltage specified under typical (TYP) applies unless otherwise noted.
3. Doubles for every 10
o
C of temperature increase.
4. +V
S
and V
S
denote the positive and negative supply rail respectively.
5. Rating applies only if output current alternates between both output transistors at a rate faster than 60Hz.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
subject to temperatures in excess of 850C to avoid generating toxic fumes.
CAUTION
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
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TYPICAL PERFORMANCE
GRAPHS
PA08 PA08A
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
4
OPERATING
CONSIDERATIONS
PA08 PA08A
GENERAL
Please read Application Note 1 "General Operating Con-
siderations" which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification
interpretation. Visit www.apexmicrotech.com for design tools
that help automate tasks such as calculations for stability, in-
ternal power dissipation, current limit and heat sink selection.
The "Application Notes" and "Technical Seminar" sections
contain a wealth of information on specific types of applications.
Package outlines, heat sinks, mounting hardware and other
accessories are located in the "Packages and Accessories"
section. Evaluation Kits are available for most Apex product
models, consult the "Evaluation Kit" section for details. For
the most current version of all Apex product data sheets, visit
www.apexmicrotech.com.
SAFE OPERATING AREA (SOA)
The output stage of most power amplifiers has two distinct
limitations:
1. The current handling capability of the transistor geometry
and the wire bonds.
2. The second breakdown effect which occurs whenever the
simultaneous collector current and collector-emitter voltage
exceeds specified limits.
The SOA curves combine the effect of these limits. For a
given application, the direction and magnitude of the output
current should be calculated or measured and checked against
the SOA curves. This is simple for resistive loads but more
complex for reactive and EMF generating loads. However, the
following guidelines may save extensive analytical efforts.
1. Under transient conditions, the following capacitive and
inductive loads are safe with the current limits set to the
maximum:
V
S
C(MAX)
L(MAX)
150V
.4F
280mH
125V
.9F
380mH
100V
2F
500mH
75V
10F
1200mH
50V
100F
13H
2. The amplifier can handle any EMF generating or reactive
load and short circuits to the supply rails or simple shorts
to common if the current limits are set as follows:
SHORT TO V
SC,
SHORT TO
V
S
C, L, OR EMF LOAD
COMMON
150V
20mA
67mA
125V
27mA
90mA
100V
42mA
130mA
75V
67mA
200mA
50V
130mA
200mA
These simplified limits may be exceeded with further analysis
using the operating conditions for a specific application.
3. The output stage is protected against transient flyback.
However, for protection against sustained, high energy
flyback, external fast-recovery diodes should be used.
INDUCTIVE LOADS
Two external diodes as shown in Figure 1, are required
to protect these amplifiers from flyback (kickback) pulses
exceeding the supply voltages of the amplifier when driving
inductive loads. For component selection, these external diodes
must be very quick, such as ultra fast recovery diodes with no
more than 200 nanoseconds of reverse recovery time. The
diode will turn on to divert the flyback energy into the supply
rails thus protecting the output transistors from destruction due
to reverse bias.
A note of caution about the supply. The energy of the flyback
pulse must be absorbed by the power supply. As a result, a tran-
sient will be superimposed on the supply voltage, the magnitude
of the transient being a function of its transient impedance and
current sinking capability. If the supply voltage plus transient
exceeds the maximum supply rating or if the AC impedance
of the supply is unknown, it is best to clamp the output and the
supply with a zener diode to absorb the transient.
INPUT PROTECTION
The input is protected against common mode voltages up to
the supply rails and differential voltages up to 50V. Increased
protection against differential input voltages can be obtained by
adding 2 resistors, 2 capacitors and 4 diode connected FETs
as shown in Figure 2.
CURRENT LIMITING
Proper operation requires the use of two current limit resis-
tors, connected as shown in the external connection diagram.
The minimum value for R
CL
is 3.24. However, for optimum
reliability it should be set as high as possible. Refer to the
"General Operating Considerations" section of the handbook
for current limit adjust details.
PROTECTION, INDUCTIVE LOAD
PROTECTION, OVERVOLTAGE
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
PA08U REV K NOVEMBER 2004 2004 Apex Microtechnology Corp.
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