APEX PA08A

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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
TYPICAL APPLICATION
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DESCRIPTION
The PA08 is a high voltage operational amplifier designed
for output voltage swings of up to ±145V with a dual (±) supply 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 supply 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 conditions.
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 interconnections 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
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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 voltage 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
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8-PIN TO-3
PACKAGE STYLE CE
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
1
PA08 • PA08A
ABSOLUTE MAXIMUM RATINGS
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal at TC = 25°C
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s max
TEMPERATURE, junction1
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
SPECIFICATIONS
PARAMETER
TEST CONDITIONS 2
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. time
BIAS CURRENT, initial3
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial3
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE4
COMMON MODE REJECTION, DC
TC = 25°C
TC = –25°C to +85°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = –25°C to +85°C
TC = –25°C to +85°C, VCM = ±90V
GAIN
OPEN LOOP GAIN at 10Hz
OPEN LOOP GAIN at 10Hz
GAIN BANDWIDTH PRODUCT at 1MHz
POWER BANDWIDTH
PHASE MARGIN
TC = 25°C, RL = ∞
TC = 25°C, RL = 1.2KΩ
TC = 25°C, RL = 1.2KΩ
TC = 25°C, RL = 1.2KΩ
TC = –25 to +85°C
OUTPUT
VOLTAGE SWING4
VOLTAGE SWING4
VOLTAGE SWING4
CURRENT, peak
SLEW RATE
CAPACITIVE LOAD, AV = 1
CAPACITIVE LOAD, AV > 4
SETTLING TIME to .1%
TC = 25°C, IO = 150mA
TC = –25o C to +85oC, IO = ±75mA
TC = –25o C to +85oC, IO = ±20mA
TC = 85°C
TC = 25°C
TC = –25 to +85°C
TC = –25 to +85°C
TC = 25°C, RL= 1.2KΩ, 2V step
POWER SUPPLY
VOLTAGE
CURRENT, quiescent
TC = –55 to +125°C
TC = 25°C
THERMAL
RESISTANCE, AC junction to case5
RESISTANCE, DC junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
TC = –55 to +125°C, F > 60Hz
TC = –55 to +125°C, F < 60Hz
TC = –55 to +125°C
Meets full range specification
MIN
±VS–10
96
PA08
TYP
±.5
±15
±.5
±75
5
.01
±2.5
105
4
MIN
±2
±30
50
±50
*
118
111
5
90
60
1
–25
MAX
130
±VS–15 ±VS–8
±VS–10 ±VS–5
±VS–5 ±VS–3
150
30
±15
300V
200mA
17.5W
±50V
±VS
300°C
175°C
–65 to +150°C
–55 to +125°C
*
10
SOA
±100
6
±150
8.5
4.26
6.22
30
8.57
85
*
*
*
*
20
PA08A
TYP
MAX
UNITS
±.5
±10
2
*
mV
µV/°C
µV/V
µV/√kh
pA
pA/V
pA
MΩ
pF
V
dB
*
*
*
*
*
dB
dB
MHz
kHz
°
*
*
*
V
V
V
mA
V/µs
nF
±.25
±5
*
*
3
*
±1.5
*
*
*
*
*
*
10
±10
*
*
*
*
*
*
*
*
*
*
*
µs
V
mA
°C/W
°C/W
°C/W
°C
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 10oC of temperature increase.
4. +VS and –VS 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.
CAUTION
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 850°C to avoid generating toxic fumes.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
2
PA08 • PA08A
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TYPICAL PERFORMANCE
GRAPHS
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
3
OPERATING
CONSIDERATIONS
PA08 • PA08A
GENERAL
Please read Application Note 1 "General Operating Considerations" 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, internal 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)
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SHORT TO ±VSC,
C, L, OR EMF LOAD
SHORT TO
COMMON
150V
125V
100V
75V
50V
20mA
27mA
42mA
67mA
130mA
67mA
90mA
130mA
200mA
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.
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±VS
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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:
±VS
C(MAX)
L(MAX)
150V
125V
100V
75V
50V
.4µF
.9µF
2µF
10µF
100µF
280mH
380mH
500mH
1200mH
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:
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PROTECTION, INDUCTIVE LOAD
PROTECTION, OVERVOLTAGE
A note of caution about the supply. The energy of the flyback
pulse must be absorbed by the power supply. As a result, a transient 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 resistors, connected as shown in the external connection diagram.
The minimum value for RCL is 3.24Ω. 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.
This data
sheet has been carefullyCORPORATION
checked and is believed
to beNORTH
reliable, however,
no responsibility
is assumed for
possible inaccuracies
omissions.
All specificationsHOTLINE:
are subject to1 change
notice.
APEX
MICROTECHNOLOGY
• 5980
SHANNON
ROAD • TUCSON,
ARIZONA
85741 • orUSA
• APPLICATIONS
(800)without
546-2739
4
PA08U REV K NOVEMBER 2004
© 2004 Apex Microtechnology Corp.