APEX PA91

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FEATURES
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HIGH VOLTAGE — 450V (±225V)
LOW QUIESCENT CURRENT — 10mA
HIGH OUTPUT CURRENT — 200mA
PROGRAMMABLE CURRENT LIMIT
HIGH SLEW RATE — 300V/µs
12-PIN SIP
PACKAGE STYLE DP
APPLICATIONS
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Formed leads available
with package styles ED & EE
PIEZOELECTRIC POSITIONING
HIGH VOLTAGE INSTRUMENTATION
ELECTROSTATIC TRANSDUCERS
PROGRAMMABLE POWER SUPPLIES UP TO 440V
TYPICAL APPLICATION
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DESCRIPTION
The PA91 is a high voltage, low quiescent current MOSFET
operational amplifier designed as a low cost solution for driving
continuous output currents up to 200mA and pulse currents
up to 350mA. The safe operating area (SOA) has no second
breakdown limitations and can be observed for all type loads by
choosing an appropriate current limiting resistor. The MOSFET
output stage is biased AB for linear operation. External compensation provides flexibility in choosing bandwidth and slew
rate for the application. APEX’s Power SIP package uses a
minimum of board space allowing for high density circuit boards.
The 12-pin PowerSIP package is electrically isolated.
EQUIVALENT SCHEMATIC
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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 PA91 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.
PHASE COMPENSATION
GAIN
CC*
RC
≥1
68pF
100Ω
≥5
10pF
100Ω
≥10
4.7pF
0Ω
≥30
NONE
0Ω
*CC To be rated for the full supply voltage +V to –Vs. Use NPO
ceramic (COG) type.
EXTERNAL CONNECTIONS
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
PA91
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, source, sink, peak
POWER DISSIPATION, continuous @ TC = 25°C
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s max.
TEMPERATURE, junction2
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
450V
350mA, within SOA
30W
±20V
±VS
260°C
150°C
–40 to +85°C
–25 to +85°C
SPECIFICATIONS
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. time
BIAS CURRENT, initial
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE3
COMMON MODE REJECTION, DC
NOISE
VCM = ±90V
100KHz BW, RS = 1KΩ, CC = OPEN
GAIN
OPEN LOOP, @ 15Hz
GAIN BANDWIDTH PRODUCT at 1MHz
POWER BANDWIDTH
PHASE MARGIN
RL = 2KΩ, CC = OPEN
RL = 2KΩ, CC = OPEN
RL = 2KΩ, CC = OPEN
Full temperature range
POWER SUPPLY
VOLTAGE 5
CURRENT, quiescent,
THERMAL
RESISTANCE, AC, junction to case 4
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
TYP
MAX
UNITS
.5
15
10
75
200
4
50
1011
4
2
50
25
98
1
mV
µV/°C
µV/V
µV/kh
pA
pA/V
pA
Ω
pF
V
dB
µVrms
94
111
100
470
60
dB
MHz
kHz
°
±VS 12
200
240
470
±VS 10
V
mA
V/µs
pF
µs
Ω
Full temperature range
IO = 200mA
CC = OPEN
Full temperature range
CC = OPEN, 2V step
See note 5
Full temperature range, F > 60Hz
Full temperature range, F < 60Hz
Full temperature range
Meets full range specifications
±VS 15
80
±
OUTPUT
VOLTAGE SWING3
CURRENT, continuous
SLEW RATE, AV = 100
CAPACITIVE LOAD, AV = +1
SETTLING TIME to .1%
RESISTANCE, no load
MIN
2000
500
±
TEST CONDITIONS 1
±
PARAMETER
300
1
50
±40
±150
10
±225
14
V
mA
2.5
4.2
°C/W
°C/W
°C/W
°C
30
–25
+85
NOTES: 1. Unless otherwise noted: TC = 25°C, DC input specifications are ± value given. Power supply voltage is typical rating. RC = 100
CC = 68pF.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to
achieve high MTTF.
3. +VS and –VS denote the positive and negative power supply rail respectively.
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.
CAUTION
The PA91 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 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
PA91
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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 prodlit@apexmicrotech.com
3
OPERATING
CONSIDERATIONS
PA91
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 PA91 can withstand differential voltages up
to ±20V, additional external protection is recommended. Low
leakage, low capacitance JFETs connected as diodes are
recommended (e.g. 2N4416, Q1-Q4 in Figure 2). The differential input voltage will be clamped to ±1.4V. 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. 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 32 ohms.
.65
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.
NOTE: The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
SAFE OPERATING CURVES
The safe operating area curves define the maximum additional internal power dissipation the amplifier can tolerate when
it produces the necessary output to drive an external load.
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Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. See Figure 2. 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 reversals 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 PA91 is externally compensated and performance can
be tailored to the application. Use the graphs of small signal
response and power response as a guide. The compensation
capacitor CC must be rated at 500V working voltage. An NPO
capacitor is recommended. The compensation network CCRC
must be mounted closely to the amplifier pins 4 and 5 to avoid
spurious oscillation.
QUIESCENT CURRENT REDUCTION
When pin 3 (IQ) is shorted to pin 5 (CC2) the AB biasing of
the output stage is disabled. This raises distortion since the
output stage is then class C biased, but reduces the quiescent
current by 1mA for a power dissipation savings of 0.4W. Pin
3 may be left open if not used.
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POWER SUPPLY PROTECTION
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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
PA91U REV F OCTOBER 2004 © 2004 Apex Microtechnology Corp.