PA97 [APEX]
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS; 高压功率运算放大器
| 型号： | PA97 |
| 厂家： | 
CIRRUS LOGIC |
| 描述： | HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS |
| 文件： | 总4页 (文件大小：203K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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FEATURES
• HIGH VOLTAGE — 900V (±450V)
• LOW QUIESCENT CURRENT — 600µA
• HIGH OUTPUT CURRENT — 10mA
PATENTED
APPLICATIONS
• MASS SPECTROMETERS
7-PIN SIP
PACKAGE STYLE DR
• SCANNING COILS
• HIGH VOLTAGE INSTRUMENTATION
• PROGRAMMABLE POWER SUPPLIES UP TO 880V
• SEMICONDUCTOR MEASUREMENT EQUIPMENT
TYPICAL APPLICATION
DESCRIPTION
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The PA97 is a high voltage MOSFET operational amplifier
designed as a low cost solution for driving continuous output
currentsupto10mAandpulsecurrentsto15mAintocapacitive
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.
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LOW POWER, PIEZOELECTRIC POSITIONING
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Piezopositioningmaybeappliedtothefocusingofsegment-
ed mirror systems. The composite mirror may be composed of
hundredsofelements,eachrequiringfocusingundercomputer
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.
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EXTERNAL CONNECTIONS
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* .01F or greater ceramic power supply bypassing required.
CC = 10pF minimum, 1kV NPO (COG).
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PHASE COMPENSATION
GAIN
CC
≥10
10pF
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PA97
SUPPLY VOLTAGE, +VS to –VS
900V
15mA, within SOA
5W
ABSOLUTE MAXIMUM RATINGS
OUTPUT CURRENT, source, sink
POWER DISSIPATION, continuous @ TC = 25°C
INPUT VOLTAGE, differential3
±20V
INPUT VOLTAGE, common mode (See Text)
TEMPERATURE, pin solder - 10s max
TEMPERATURE, junction2
±VS
220°C
150°C
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
–65 to +150°C
–55 to +125°C
SPECIFICATIONS
PARAMETER
TEST CONDITIONS1
MIN
TYP
MAX
UNITS
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. time
BIAS CURRENT, initial
.5
10
10
75
200
4
50
1011
4
5
50
25
mV
µV/°C
µV/V
µV/kh
pA
pA/V
pA
Ω
pF
V
dB
µVrms
Full temperature range
2000
500
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
±
COMMON MODE VOLTAGE RANGE3
COMMON MODE REJECTION, DC
NOISE
VS=±250V See Note 3
VCM = ±90V
10KHz BW, RS = 1KΩ, CC = 10pF
±VS 30
80
98
2
GAIN
OPEN LOOP, @ 15Hz
GAIN BANDWIDTH PRODUCT at 1MHz RL = 5KΩ, CC = 10pF
POWER BANDWIDTH
PHASE MARGIN, AV = 100
RL = 5KΩ, CC = 10pF
94
111
1
2
dB
MHz
kHz
°
RL = 5KΩ, CC = 10pF
Full temperature range
60
OUTPUT
±
±
VOLTAGE SWING3
CURRENT, continuous
SLEW RATE, AV = 100
SETTLING TIME to .1%
RESISTANCE
IO = 10mA
±VS 24
10
±VS 20
V
mA
V/µs
µs
CC = 10pF
CC = 10pF, 2V step
10mA Load
8
2
100
Ω
POWER SUPPLY
VOLTAGE5
CURRENT, quiescent,
See note 5
±50
±300
.6
±450
1
V
mA
THERMAL
RESISTANCE, AC, junction to case4
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
Full temperature range, F > 60Hz
Full temperature range, F < 60Hz
Full temperature range
20
25
°C/W
°C/W
°C/W
°C
40
–25
+85
NOTES: 1. Unless otherwise noted: TC = 25°C, DC input specifications are ± value given. Power supply voltage is typical rating. CC = 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 25°C case. No derating needed above 25°C case.
The PA97 is constructed from MOSFET transistors. ESD handling procedures must be observed.
CAUTION
The exposed substrate contains beryllia (BeO). Do not crush, machine, or subject to temperatures in excess of 850°C to
avoid generating toxic fumes.
2APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
TYPICAL PERFORMANCE
GRAPHS
PA97
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
3
OPERATING
CONSIDERATIONS
PA97
Conditionswhichcancauseopencircuitsorpolarityreversals
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.
GENERAL
Pleasereadthe“GeneralOperatingConsiderations”section,
whichcoversstability,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.
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.
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
thecommonmodeinputvoltagerangeofthePA97isrestricted.
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.
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
topreventspuriousoscillation. Acompensationcapacitorless
than 10pF is not recommended.
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INPUT PROTECTION
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Although the PA97 can withstand differential input voltages
up to ±20V, additional external protection is recommended. In
mostapplications1N4148or1N914signaldiodesaresufficient
(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.
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POWER SUPPLY PROTECTION
Unidirectionalzenerdiodetransientsuppressorsarerecom-
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.
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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.
4
PA97U REV E AUGUST 2005 © 2005 Apex Microtechnology Corp.
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