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FEATURES
• HIGH VOLTAGE — 400V (±200V)
• LOW QUIESCENT CURRENT — 10mA
• HIGH OUTPUT CURRENT — 4A
• PROGRAMMABLE CURRENT LIMIT
APPLICATIONS
• PIEZOELECTRIC POSITIONING
• HIGH VOLTAGE INSTRUMENTATION
• ELECTROSTATIC TRANSDUCERS
• PROGRAMMABLE POWER SUPPLIES UP TO 390V
DESCRIPTION
The PA92 is a high voltage, low quiescent current MOSFET
operational amplifier designed as a low cost solution for driving
continuous output currents up to 4A and pulse currents up to
7A. 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
Power SIP package is electrically isolated.
EQUIVALENT SCHEMATIC
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 PA92 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 150pF 100Ω
≥2 100pF 100Ω
≥3 47pF 0Ω
≥12 10pF 0Ω
*CC Never to be <10pF. CC to be rated for the full supply
voltage +V to -Vs. Use ceramic NPO (COG) type.
EXTERNAL CONNECTIONS
PATENTED
12-PIN SIP
PACKAGE STYLE DP
Formed leads availablewith
package styles ED & EE
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
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ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +VS to –VS 400V
OUTPUT CURRENT, source, sink, peak 7A, within SOA
POWER DISSIPATION, continuous @ TC = 25°C 80W
INPUT VOLTAGE, differential ±20V
INPUT VOLTAGE, common mode ±VS
TEMPERATURE, pin solder - 10s max. 260°C
TEMPERATURE, junction2 150°C
TEMPERATURE RANGE, storage –40 to +85°C
OPERATING TEMPERATURE RANGE, case –25 to +85°C
PA92
SPECIFICATIONS
PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS
INPUT
OFFSET VOLTAGE, initial 2 10 mV
OFFSET VOLTAGE, vs. temperature Full temperature range 15 50 µV/°C
OFFSET VOLTAGE, vs. supply 10 25 µV/V
OFFSET VOLTAGE, vs. time 75 µV/kh
BIAS CURRENT, initial 200 2000 pA
BIAS CURRENT, vs. supply 4 pA/V
OFFSET CURRENT, initial 50 500 pA
INPUT IMPEDANCE, DC 1011 Ω
INPUT CAPACITANCE 4 pF
COMMON MODE VOLTAGE RANGE3 ±VS 15 V
COMMON MODE REJECTION, DC VCM = ±90V 80 98 dB
NOISE 100KHz BW, RS = 1KΩ, CC = 10pF 1 µVrms
GAIN
OPEN LOOP, @ 15Hz RL = 2KΩ, CC = 10pF 94 111 dB
GAIN BANDWIDTH PRODUCT at 1MHz RL = 2KΩ, CC = 10pF 18 MHz
POWER BANDWIDTH RL = 2KΩ, CC = 10pF 30 kHz
PHASE MARGIN Full temperature range 60 °
OUTPUT
VOLTAGE SWING3 IO = 4A ±VS 12 ±VS 10 V
CURRENT, continuous 4 A
SLEW RATE, AV = 100 CC = 10pF 50 V/µs
CAPACITIVE LOAD, AV = +1 Full temperature range 1 nf
SETTLING TIME to .1% CC = 10pF, 2V step 1 µs
RESISTANCE, no load 10 Ω
POWER SUPPLY
VOLTAGE5 See note 5 ±50 ±150 ±200 V
CURRENT, quiescent, 10 14 mA
THERMAL
RESISTANCE, AC, junction to case 4 Full temperature range, F > 60Hz 1 °C/W
RESISTANCE, DC, junction to case Full temperature range, F < 60Hz 1.5 °C/W
RESISTANCE, junction to air Full temperature range 30 °C/W
TEMPERATURE RANGE, case Meets full range specifications –25 +85 °C
NOTES: 1. Unless otherwise noted: TC = 25°C, DC input specifications are ± value given. Power supply voltage is typical rating. RC = 100
CC = 150pF.
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 PA92 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.
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±
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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
PA92
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OPERATING
CONSIDERATIONS PA92
GENERAL
Please read Application Note 1 "General Operating Con-
siderations" 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.
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 16 ohms.
.65
RCL =
ILIM
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational ampli-
fier 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 fly-
back. 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 addi-
tional internal power dissipation the amplifier can tolerate when
it produces the necessary output to drive an external load.
INPUT PROTECTION
Although the PA92 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 differ-
ential input voltage will be clamped to ±1.4V. This is sufficient
overdrive to produce maximum power bandwidth.
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors are recom-
mended 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 sup-
ply 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 PA92 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 lowers quiescent power but
also raises distortion since the output stage is then class C
biased. The output stage bias current is nominally set at 1mA.
Pin 3 may be left open if not used.
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.
PA92U REV H OCTOBER 2004 © 2004 Apex Microtechnology Corp.
