APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
1
FEATURES
HIGH VOLTAGE -- 400V (200V)
LOW QUIESCENT CURRENT -- 10mA
HIGH OUTPUT CURRENT -- 8A
PROGRAMMABLE CURRENT LIMIT
APPLICATIONS
PIEZOELECTRIC POSITIONING
HIGH VOLTAGE INSTRUMENTATION
ELECTROSTATIC TRANSDUCERS
PROGRAMMABLE POWER SUPPLIES UP TO 390V
DESCRIPTION
The PA93 is a high voltage, low quiescent current MOSFET
operational amplifier designed as a low cost solution for driving
continuous output currents up to 8A and pulse currents up to
14A. 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 PA93 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
C
C
*
R
C
1
220pF 100
2
100pF 100
4
47pF
0
17
10pF
0
*C
C
Never to be <10pF. C
C
to be rated for the full supply
voltage +VS to -VS. Use ceramic NPO (COG) type.
EXTERNAL CONNECTIONS
PATENTED
12-PIN SIP
PACKAGE STYLE DP
Formed leads available
See 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, +V
S
to V
S
400V
OUTPUT CURRENT, source, sink, peak
14A, within SOA
POWER DISSIPATION, continuous @ T
C
= 25C
125W
INPUT VOLTAGE, differential
20V
INPUT VOLTAGE, common mode
V
S
TEMPERATURE, pin solder - 10s max
260C
TEMPERATURE, junction
2
150C
TEMPERATURE RANGE, storage
40 to +85C
OPERATING TEMPERATURE RANGE, case
25 to +85C
PA93
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
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
15
V
COMMON MODE REJECTION, DC
V
CM
= 90V
80
98
dB
NOISE
100KHz BW, R
S
= 1K, C
C
= 10pF
1
Vrms
GAIN
OPEN LOOP, @ 15Hz
R
L
= 2K, C
C
= 10pF
94
111
dB
GAIN BANDWIDTH PRODUCT at 1MHz R
L
= 2K, C
C
= 10pF
12
MHz
POWER BANDWIDTH
R
L
= 2K, C
C
= 10pF
30
kHz
PHASE MARGIN
Full temperature range
60
OUTPUT
VOLTAGE SWING
3
I
O
= 8A
V
S
12
V
S
10
V
CURRENT, continuous
8
A
SLEW RATE, A
V
= 100
C
C
= 10pF
50
V/s
CAPACITIVE LOAD, A
V
= +1
Full temperature range
1
nf
SETTLING TIME to .1%
C
C
= 10pF, 2V step
1
s
RESISTANCE, no load
10
POWER SUPPLY
VOLTAGE
5
See note 5
40
150
200
V
CURRENT, quiescent,
10
14
mA
THERMAL
RESISTANCE, AC, junction to case
4
Full temperature range, F > 60Hz
.7
C/W
RESISTANCE, DC, junction to case
Full temperature range, F < 60Hz
1
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: T
C
= 25C, DC input specifications are value given. Power supply voltage is typical rating. R
C
= 100
C
C
= 220pF.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to
achieve high MTTF.
3. +V
S
and V
S
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 25C case. No derating needed above 25C case.
CAUTION
The PA93 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
PA93
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
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OPERATING
CONSIDERATIONS
PA93
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 (R
CL
) 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
R
CL
=
I
LIM
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 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 addi-
tional internal power dissipation the amplifier can tolerate when
it produces the necessary output to drive an external load.
INPUT PROTECTION
Although the PA93 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 PA93 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 C
C
must be rated at 500V working voltage. An NPO
capacitor is recommended. The compensation network C
C
R
C
must be mounted closely to the amplifier pins 4 and 5 to avoid
spurious oscillation.
QUIESCENT CURRENT REDUCTION
When pin 3 (I
Q
) 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.
PA93U REV G OCTOBER 2004 2004 Apex Microtechnology Corp.
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