APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
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TYPICAL APPLICATION
LOW POWER, PIEZOELECTRIC POSITIONING
Piezo positioning may be applied to the focusing of segment-
ed mirror systems. The composite mirror may be composed of
hundreds of elements, each requiring focusing under computer
control. In such complex systems the PA97 reduces the costs
of power supplies and cooling with its advantages of low cost
and low quiescent power consumption while increasing circuit
density with the SIP package.
EXTERNAL CONNECTIONS
* .01F or greater ceramic power supply bypassing required.
CC = 10pF minimum, 1kV NPO (COG).
PHASE COMPENSATION
GAIN
CC
10
10pF
FEATURES
HIGH VOLTAGE -- 900V (450V)
LOW QUIESCENT CURRENT -- 600A
HIGH OUTPUT CURRENT -- 10mA
APPLICATIONS
MASS SPECTROMETERS
SCANNING COILS
HIGH VOLTAGE INSTRUMENTATION
PROGRAMMABLE POWER SUPPLIES UP TO 880V
SEMICONDUCTOR MEASUREMENT EQUIPMENT
DESCRIPTION
The PA97 is a high voltage MOSFET operational amplifier
designed as a low cost solution for driving continuous output
currents up to 10mA and pulse currents to 15mA into capacitive
loads. The safe operating area (SOA) has no second break-
down limitations. The MOSFET output stage is biased class
C for low quiescent current operation. External compensation
provides flexibility in choosing bandwidth and slew rate for the
application. APEX's SIP05 package uses a minimum of board
space allowing for high density circuit boards.
EQUIVALENT SCHEMATIC
PATENTED
7-PIN SIP
PACKAGE STYLE DR
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
2
PARAMETER
TEST CONDITIONS
1
MIN
TYP
MAX
UNITS
INPUT
OFFSET VOLTAGE, initial
.5
5
mV
OFFSET VOLTAGE, vs. temperature
Full temperature range
10
50
V/C
OFFSET VOLTAGE, vs. supply
10
25
V/V
OFFSET VOLTAGE, vs. time
75
V/kh
BIAS CURRENT, initial
200
2000
pA
BIAS CURRENT, vs. supply
4
pA/V
OFFSET CURRENT, initial
50
500
pA
INPUT IMPEDANCE, DC
10
11
INPUT CAPACITANCE
4
pF
COMMON MODE VOLTAGE RANGE
3
V
S
=250V See Note 3
V
S
30
V
COMMON MODE REJECTION, DC
V
CM
= 90V
80
98
dB
NOISE
10KHz BW, R
S
= 1K, C
C
= 10pF
2
Vrms
GAIN
OPEN LOOP, @ 15Hz
R
L
= 5K, C
C
= 10pF
94
111
dB
GAIN BANDWIDTH PRODUCT at 1MHz R
L
= 5K, C
C
= 10pF
1
MHz
POWER BANDWIDTH
R
L
= 5K, C
C
= 10pF
2
kHz
PHASE MARGIN, A
V
= 100
Full temperature range
60
OUTPUT
VOLTAGE SWING
3
I
O
= 10mA
V
S
24
V
S
20
V
CURRENT, continuous
10
mA
SLEW RATE, A
V
= 100
C
C
= 10pF
8
V/s
SETTLING TIME to .1%
C
C
= 10pF, 2V step
2
s
RESISTANCE
10mA Load
100
POWER SUPPLY
VOLTAGE
5
See note 5
50
300
450
V
CURRENT, quiescent,
.6
1
mA
THERMAL
RESISTANCE, AC, junction to case
4
Full temperature range, F > 60Hz
20
C/W
RESISTANCE, DC, junction to case
Full temperature range, F < 60Hz
25
C/W
RESISTANCE, junction to air
Full temperature range
40
C/W
TEMPERATURE RANGE, case
25
+85
C
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
to V
S
900V
OUTPUT CURRENT, source, sink
15mA, within SOA
POWER DISSIPATION, continuous @ T
C
= 25C
5W
INPUT VOLTAGE, differential
3
20V
INPUT VOLTAGE, common mode (See Text)
V
S
TEMPERATURE, pin solder - 10s max
220C
TEMPERATURE, junction
2
150C
TEMPERATURE, storage
65 to +150C
OPERATING TEMPERATURE RANGE, case
55 to +125C
PA97
SPECIFICATIONS
NOTES: 1. Unless otherwise noted: T
C
= 25C, DC input specifications are value given. Power supply voltage is typical rating. C
C
= 10pF.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to
achieve high MTTF.
3. Although supply voltages can range up to 450V the input pins cannot swing over this range. The input pins must be at least
30V from either supply rail but not more than 500V from either supply rail. See text for a more complete description of the com-
mon mode voltage range.
4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
5. Derate max supply rating .625 V/C below 25C case. No derating needed above 25C case.
CAUTION
The PA97 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The exposed substrate contains beryllia (BeO). Do not crush, machine, or subject to temperatures in excess of 850C to
avoid generating toxic fumes.
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
PA97
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
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OPERATING
CONSIDERATIONS
PA97
GENERAL
Please read the "General Operating Considerations" section,
which covers stability, supplies, heatsinking, mounting, current
limit, SOA interpretation, and specification interpretation. Ad-
ditional information can be found in the application notes. For
information on the package outline, heatsinks, and mounting
hardware, consult the "Accessory and Package Mechanical
Data" section of the handbook.
CURRENT LIMIT
The PA97 has no provision for current limiting the out-
put.
COMMON MODE INPUT RANGE
Operational amplifiers are usually designed to have a com-
mon mode input voltage range that approximates the power
supply voltage range. However, to keep the cost as low as
possible and still meet the requirements of most applications
the common mode input voltage range of the PA97 is restricted.
The input pins must always be a least 30V from either supply
voltage but never more than 500V. This means that the PA97
cannot be used in applications where the supply voltages
are extremely unbalanced. For example, supply voltages
of +800V and 100V would not be allowed in an application
where the non-inverting pin is grounded because in normal
operation both input pins would be at 0V and the difference
voltage between the positive supply and the input pins would
be 800V. In this kind of application, however, supply voltages
+500V and -100V does meet the input common mode voltage
range requirements since the maximum difference voltage
between the inputs pins and the supply voltage is 500V (the
maximum allowed). The output has no such restrictions on
its voltage swing. The output can swing within 24V of either
supply voltage regardless of value so long as the total supply
voltage does not exceed 900V.
INPUT PROTECTION
Although the PA97 can withstand differential input voltages
up to 20V, additional external protection is recommended. 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
2N5457-2N5459 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. Note that this protection
does not automatically protect the amplifier from excessive
common mode input voltages.
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors are recom-
mended 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.
EXTERNAL COMPONENTS
The compensation capacitor Cc must be rated for the total
supply voltage. 10pF NPO (COG)capacitor rated at 1kV is
recommended.
Of equal importance is the voltage rating and voltage coef-
ficient of the gain setting feedback resistor. Typical voltage
ratings of low wattage resistors are 150 to 250V. Up to 900 V
can appear across the feedback resistor. High voltage rated
resistors can be obtained. However a 1 megohm feedback
resistor composed of five 200k resistors in series will produce
the proper voltage rating.
CAUTIONS
The operating voltages of the PA97 are potentially lethal.
During circuit design develop a functioning circuit at the lowest
possible voltages. Clip test leads should be used for "hands
off" measurements while troubleshooting. With no internal
current limit, proper choice of load impedance and supply
voltage is required to meed SOA limitiations. An output short
circuit will destroy the amplifier within milliseconds.
STABILITY
The PA97 is stable at gains of 10 or more with a NPO (COG)
compensation capacitor of 10pF. The compensation capaci-
tor, Cc, in the external connections diagram must be rated at
1000V working voltage and mounted closely to pins 4 and 6
to prevent spurious oscillation. A compensation capacitor less
than 10pF is not recommended.
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.
PA97U REV E AUGUST 2005 2005 Apex Microtechnology Corp.
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