APEX PA88A

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FEATURES
•
•
•
•
•
HIGH VOLTAGE — 450V (±225V)
LOW QUIESCENT CURRENT — 2mA
HIGH OUTPUT CURRENT — 100mA
PROGRAMMABLE CURRENT LIMIT
LOW BIAS CURRENT — FET Input
PATENTED
APPLICATIONS
•
•
•
•
8-PIN TO-3
PACKAGE STYLE CE
PIEZOELECTRIC POSITIONING
HIGH VOLTAGE INSTRUMENTATION
ELECTROSTATIC TRANSDUCERS
PROGRAMMABLE POWER SUPPLIES UP TO 440V
TYPICAL APPLICATION
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DESCRIPTION
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The PA88 is a high voltage, low quiescent current MOSFET operational amplifier designed for output currents up to
100mA. Output voltages can swing up to ±215V with a dual
supply and up to +440 volts with a single supply. The safe
operating area (SOA) has no second breakdown limitations
and can be observed with all types of loads by choosing an
appropriate current limiting resistor. High accuracy is achieved
with a cascode input circuit configuration. All internal biasing is
referenced to a bootstrapped zener-MOSFET current source.
As a result, the PA88 features an unprecedented supply range
and excellent supply rejection. The MOSFET output stage is
biased on for linear operation. External compensation provides
user flexibility.
This hybrid circuit utilizes beryllia (BeO) substrates, 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”.
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LOW POWER, PIEZOELECTRIC POSITIONING
Piezo positioning may be applied to the focusing of
segmented mirror systems. The composite mirror may be
composed of hundreds of elements, each requiring focusing
under computer control. In such complex systems the PA88’s
advantage of low quiescent power consumption reduces
the costs of power supplies and cooling, while providing the
interface between the computer and the high voltage drive to
the piezo positioners.
EXTERNAL CONNECTIONS
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EQUIVALENT SCHEMATIC
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
1
PA88 • PA88A
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, source, sink
POWER DISSIPATION, continuous @ TC = 25°C
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s max
TEMPERATURE, junction2
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
SPECIFICATIONS
PARAMETER
TEST CONDITIONS 1
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
NOISE
VCM = ±90V
100kHz BW, RS = 1KΩ, CC = 15pf
GAIN
OPEN LOOP, @ 15Hz
GAIN BANDWIDTH PRODUCT at 1MHz
POWER BANDWIDTH
PHASE MARGIN
RL = 2KΩ, CC = OPEN
RL = 2KΩ, CC = 15pf, RC = 100Ω
RL = 2KΩ, CC = 15pf, RC = 100Ω
Full temperature range
OUTPUT
VOLTAGE SWING4
VOLTAGE SWING4
CURRENT, continuous
SLEW RATE, AV = 20
SLEW RATE, AV = 100
CAPACITIVE LOAD, AV = +1
SETTLING TIME to .1%
RESISTANCE, no load
Full temp. range, IO = ±75mA
Full temp. range, IO = ±20mA
TC = 85°C
CC = 15pf, RC = 100Ω
CC = OPEN
Full temperature range
CC = 15pf, RC = 100Ω, 2V step
RCL = 0
POWER SUPPLY
VOLTAGE6
CURRENT, quiescent,
THERMAL
RESISTANCE, AC, junction to case5
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
MIN
Full temperature range
See note 6
Full temperature range, F > 60Hz
Full temperature range, F < 60Hz
Full temperature range
Meets full range specifications
±VS–15
90
96
PA88
TYP
.5
10
1
75
5
.01
2.5
1011
4
MAX
–25
30
UNITS
.5
10
*
*
*
mV
µV/°C
µV/V
µV/√kh
pA
pA/V
pA
Ω
pF
V
dB
µVrms
*
*
*
*
*
dB
MHz
kHz
°
*
*
*
*
*
*
*
V
V
mA
V/µs
V/µs
pf
µs
Ω
100
*
*
111
2.1
6
60
*
±225
2
*
5.0
8.3
+85
PA88A
TYP
MAX
50
110
2
±200
1.7
MIN
2
30
5
±VS–16 ±VS–14
±VS–10 ±VS–5.2
±100
8
30
470
10
100
±15
450V
See SOA
15W
±25V
±VS
300°C
150°C
–65 to +150°C
–55 to +125°C
*
.25
5
*
*
3
*
3
*
*
10
20
*
*
*
*
*
*
*
V
mA
*
*
°C/W
°C/W
°C/W
°C
*
NOTES: * The specification of PA88A is identical to the specification for PA88 in applicable column to the left.
1. Unless otherwise noted: TC = 25°C, compensation = CC = 68pF, RC = 100Ω. DC input specifications are ± value given. Power
supply voltage is typical rating.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to
achieve high MTTF.
3. Doubles for every 10°C of temperature increase.
4. +VS and –VS denote the positive and negative power supply rail respectively.
5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
6. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case.
CAUTION
The PA88 is constructed from MOSFET transistors. ESD handling procedures must be observed.
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
PA88 • PA88A
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
PA88 • PA88A
GENERAL
INPUT PROTECTION
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; heat sink selection;
Apex’s complete Application Notes library; Technical Seminar
Workbook; and Evaluation Kits.
Although the PA88 can withstand differential input voltages
up to ±25V, additional external protection is recommended,
and required at total supply voltages above 300 volts. In most
applications 1N4148 or 1N914 signal diodes are sufficient (D1,
D2 in Figure 2a). In more demanding applications where low
leakage or low capacitance are of concern 2N4416 or 2N54572N5459 JFETs connected as diodes will be required (Q1, Q2
in Figure 2b). In either case the input differential voltage will
be clamped to ±.7V. This is sufficient overdrive to produce
maximum power bandwidth.
CURRENT LIMIT
For proper operation, the current limit resistor (RCL) must be
connected as shown in the external connection diagram. The
minimum value is 3.5 ohm, however for optimum reliability the
resistor value should be set as high as possible. The value
is calculated as follows; with the maximum practical value of
150 ohms.
.7
RCL =
ILIM
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational amplifier has two distinct limitations:
1. The current handling capability of the MOSFET geometry
and the wire bonds.
2. The junction temperature of the output MOSFETs.
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NOTE: The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. The zeners clamp
transients to voltages within the power supply rating and also
clamp power supply reversals to ground. Whether the zeners
are used or not, the system power supply should be evaluated
for transient performance including power-on overshoot and
power-off polarity reversal as well as line regulation.
Conditions which can cause open circuits or polarity reversals
on either power supply rail should be avoided or protected
against. Reversals or opens on the negative supply rail is
known to induce input stage failure. Unidirectional transzorbs
prevent this, and it is desirable that they be both electrically
and physically as close to the amplifier as possible.
STABILITY
The PA88 has sufficient phase margin to be stable with
most capacitive loads at a gain of 4 or more, using the recommended phase
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compensation.
The PA88 is exter��
nally compensated
and performance can
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be tailored to the ���
application. Use the
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graphs of small signal
response and power ���
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response as a guide.
The compensation
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capacitor C C must
be rated at 500V
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working voltage. An ��
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NPO capacitor is
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compensation net�
work CCRC must be
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mounted closely to
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the amplifier pins 7
and 8 to avoid spuri- ���
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FIGURE 2. OVERVOLTAGE PROTECTION
This data
sheet has been carefullyCORPORATION
checked and is believed
to be NORTH
reliable, however,
no responsibility
is assumed for
possible inaccuracies
omissions.
All specificationsHOTLINE:
are subject to1change
notic
APEX
MICROTECHNOLOGY
• 5980
SHANNON
ROAD • TUCSON,
ARIZONA
85741 •orUSA
• APPLICATIONS
(800)without
546-2739
4
PA88U REV L FEBRUARY 2005
© 2005 Apex Microtechnology Corp.