APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
FEATURES
MONOLITHIC MOS TECHNOLOGY
LOW COST
HIGH VOLTAGE OPERATION--350V
LOW QUIESCENT CURRENT--2mA
NO SECOND BREAKDOWN
HIGH OUTPUT CURRENT--120 mA PEAK
AVAILABLE IN DIE FORM--PA41DIE
APPLICATIONS
PIEZO ELECTRIC POSITIONING
ELECTROSTATIC TRANSDUCER & DEFLECTION
DEFORMABLE MIRROR FOCUSING
BIOCHEMISTRY STIMULATORS
COMPUTER TO VACUUM TUBE INTERFACE
DESCRIPTION
The PA41/42 are high voltage monolithic MOSFET opera-
tional amplifiers achieving performance features previously
found only in hybrid designs while increasing reliability. Inputs
are protected from excessive common mode and differential
mode voltages. The safe operating area (SOA) has no second
breakdown limitations and can be observed with all type loads
by choosing an appropriate current limiting resistor. External
compensation provides the user flexibility in choosing
optimum gain and bandwidth for the application.
The PA41 is packaged in a hermetically sealed TO-3 and all
circuitry is isolated from the case by an aluminum nitride (AlN)
substrate.
The PA42 is packaged in APEX's hermetic ceramic SIP10
package.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATION
NOTE: PA41 Recommended mounting torque is 4-7 inlbs
(.45 -.79 Nm)
CAUTION: The use of compressible, thermally conductive
insulators may void warranty.
LOW COST 660V p-p
PIEZO DRIVE
Two PA41/42 amplifiers operated as a bridge driver for a
piezo transducer provides a low cost 660 volt total drive capa-
bility. The R
N
C
N
network serves to raise the apparent gain of A2
at high frequencies. If R
N
is set equal to R the amplifiers can be
compensated identically and will have matching bandwidths.
EXTERNAL CONNECTIONS
TOP VIEW
1
2
3
4
5
6
7
8
OUT
I
LIM
V
S
+V
S
COMP
IN
+IN
C , C ARE NPO RATED
FOR FULL SUPPLY VOLTAGE.
=
3
COMP
C
C
100
330pF
R
C
R
CL
R
CL
I
LIM
S
C
S
C
R
S
PHASE
COMPENSATION
Gain
C
C
R
C
1
18pF
2.2K
10
10pF
2.2K
30
3.3pF
2.2K
PA41
PA42
R
CL
C
C
100
1
2
3
4
5
6
7
8
9
10
IN
+IN
NC
V
S
C
C
I
LIM
C
S
C
C
R
C
OUT
NC
330pf
+V
S
TOP VIEW
R
S
A1
PA41/42
A2
PA41/42
20R
PIEZO
TRANSDUCER
20R
Rn
20R
Cn
R
V
IN
175
+175
175
+175
R
CL
R
CL
180
180
2.2K
10pF
10pF
330pF
330pF
100
100
2.2K
4
7
IN
OUT
+V
S
V
S
1
8
6
+IN
5
D2
D3
D4
D5
Q5
Q4
Q1
Q11
Q12
D1
Q2
Q6
Q8
Q13
Q14
Q10
Q9
Q7
Q3
I
LIM
2
COMP
3
COMP
(5)
(10)
(7)
(6)
(8)
(9)
(2)
(1)
5
(1)
PA41 PIN NUMBER
PA42 PIN NUMBER
H T T P : / / W W W . A P E X M I C R O T E C H . C O M ( 8 0 0 ) 5 4 6 - A P E X ( 8 0 0 ) 5 4 6 - 2 7 3 9
M I C R O T E C H N O L O G Y
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA41/PA42 PA41A/PA42A
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PA41/PA42 PA41A/PA42A
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
to V
S
350V
350V
OUTPUT CURRENT, continuous within SOA
60 mA
60 mA
OUTPUT CURRENT, peak
120 mA
120 mA
POWER DISSIPATION, continuous @ T
C
= 25
C
12W
9W
INPUT VOLTAGE, differential
16 V
16 V
INPUT VOLTAGE, common mode
V
S
V
S
TEMPERATURE, pin solder 10 sec
300
C
220
C
TEMPERATURE, junction
2
150
C
150
C
TEMPERATURE, storage
65 to +150
C
65 to +150
C
TEMPERATURE RANGE, powered (case)
40 to +125
C
40 to +125
C
CAUTION
The PA41/PA42 is constructed from MOSFET transistors. ESD handling procedures must be observed.
PARAMETER
TEST CONDITIONS
1
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
INPUT
OFFSET VOLTAGE, initial
25
40
15
30
mV
OFFSET VOLTAGE, vs. temperature
4, 7
Full temperature range
70
130
40/*
65/*
V/
C
OFFSET VOLTAGE, vs supply
20
32
*
*
V/V
OFFSET VOLTAGE, vs time
75
*
V
kh
BIAS CURRENT, initial
7
5/100
50/2000
*
*
pA
BIAS CURRENT, vs supply
.2/.5
.5/50
*
*
pA/V
OFFSET CURRENT, initial
7
2.5/100 50/400
*
*
pA
INPUT IMPEDANCE, DC
10
11
*
INPUT CAPACITANCE
5
*
pF
COMMON MODE, voltage range
V
S
12
*
V
COMMON MODE REJECTION, DC
V
CM
=
90V DC
84
94
*
*
dB
NOISE, broad band
10kHz BW, R
S
= 1K
50
*
V RMS
NOISE, low frequency
1-10 Hz
110
*
V p-p
GAIN
OPEN LOOP at 15Hz
R
L
= 5K
94
106
*
*
dB
BANDWIDTH, open loop
1.6
*
MHz
POWER BANDWIDTH
C
C
= 10pf, 280V p-p
26
*
kHz
PHASE MARGIN
Full temperature range
60
*
OUTPUT
VOLTAGE SWING
I
O
= 40mA
V
S
12
V
S
10
V
S
10
V
S
8.5
V
CURRENT, peak
5
120
*
mA
CURRENT, continuous
60
*
mA
SETTLING TIME to .1%
C
C
= 10pF, 10V step, A
V
= 10
12
*
s
SLEW RATE
C
C
= OPEN
40
*
V/
s
CAPACITIVE LOAD
A
V
= +1
10
*
nF
RESISTANCE
6
, no load
R
CL
= 0
150
*
RESISTANCE
6
, 20mA load
R
CL
= 0
25
*
POWER SUPPLY
VOLTAGE
3
See Note 3
50
150
175
*
*
*
V
CURRENT, quiescent
1.6
2.0
.9
1.4
1.8
mA
THERMAL
PA41 RESISTANCE, AC junction to case
F > 60Hz
5.4
6.5
*
*
C/W
PA42 RESISTANCE, AC junction to case
F > 60Hz
7
10
*
*
C/W
PA41 RESISTANCE, DC junction to case
F < 60Hz
9
10.4
*
*
C/W
PA42 RESISTANCE, DC junction to case
F < 60Hz
12
14
*
*
C/W
PA41 RESISTANCE, junction to air
Full temperature range
30
*
C/W
PA42 RESISTANCE, junction to air
Full temperature range
55
*
C/W
TEMPERATURE RANGE, case
Meets full range specifications
25
+85
*
*
C
SPECIFICATIONS
NOTES:
*
The specification for PA41A/PA42A is identical to the specification for PA41/PA42 in applicable column to the left.
1.
Unless otherwise noted T
C
= 25
C, C
C
= 18pF, R
C
= 2.2K
. DC input specifications are
value given. Power supply voltage is
typical rating.
2.
Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF. For guidance, refer to heatsink data sheet.
3.
Derate maximum supply voltage .5 V/
C below case temperature of 25
C. No derating is needed above T
C
= 25
C.
4.
Sample tested by wafer to 95%.
5.
Guaranteed but not tested.
6.
The selected value of R
CL
must be added to the values given for total output resistance.
7.
Specifications separated by / indicate values for the PA41 and PA42 respectively.
PA41/PA42
PA41A/PA42A
PA41/PA41A
PA42/PA42A
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
TYPICAL PERFORMANCE
GRAPHS
PA41/PA42 PA41A/PA42A
CURRENT LIMIT RESISTOR, R
CL
( )
0
25
50
75
100
125
TEMPERATURE, T (C)
0
3
6
POWER DERATING
INTERNAL POWER DISSIPATION, P(W)
50
0
100
80
100
130
140
CURRENT LIMIT
110
90
100
150
300
350
TOTAL SUPPLY VOLTAGE, V
S
(V)
NORMALIZED QUIESCENT CURRENT, (%)
1
100
10M
FREQUENCY, F (Hz)
20
0
60
120
SMALL SIGNAL RESPONSE
OPEN LOOP GAIN, A(dB)
20
40
80
100
1
100
.1M
10M
210
150
60
0
PHASE RESPONSE
90
30
10K
20K
.2M
.1M
FREQUENCY, F (Hz)
20
OUTPUT VOLTAGE, V (V )
O
1
100
1K
1M
FREQUENCY, F (Hz)
0
80
120
COMMON MODE REJECTION
COMMON MODE REJECTION, CMR (dB)
20
60
100
1
1M
FREQUENCY, F (Hz)
0
20
120
POWER SUPPLY REJECTION
POWER SUPPLY REJECTION, PSR (dB)
40
100
0
40
60
OUTPUT CURRENT, I
O
(mA)
2
10
OUTPUT VOLTAGE SWING
VOLTAGE DROP FROM SUPPLY, V
S
V
O
(V)
4
8
100
10K
FREQUENCY, F (Hz)
.002
HARMONIC DISTORTION
DISTORTION, (%)
.02
1.0
30K
200
1K
0
COMPENSATION CAPACITANCE, C
C
(pf)
SLEW RATE
SLEW RATE, V/s
0
300
400
60
40
CURRENT LIMIT
CURRENT LIMIT RANGE, I (mA)
20
10
10K
.1M
20
120
0
QUIESCENT CURRENT
200
50
70
90
1K
25
25
50
75
120
15
POWER RESPONSE
PP
30K
10
100
1K
10K .1M
80
100
200
40
20
0
10
1K
10K .1M 1M
9
12
10
10K
1M
FREQUENCY, F (Hz)
PHASE, (
)
NORMALIZED CURRENT LIMIT, (%)
0
3K
100K
.004
.04
4
20
8
16
12
10
20
30
40
50
60
40
60
80
100
200
400
40
80
60
PA41
T = T
125
+I
LIM
500
60
CASE TEMPERATURE, T (C)
C
180
120
110
130
150
6
-I
LIM
C
C
= 18pF
C
C
= 10pF
C
C
= 3.3pF
C
C
= 18pF
C
C
= 18pF
C
C
= 10pF
C
C
= 3.3pF
C
C
= 3.3pF
C
C
= 10pF
50K
.3M .5M
1M
C
C
= 10pF
C
C
= 3.3pF
C
C
= 18pF
R
L
= 10K
.006
.01
.06
.1
.2
.4
.6
I
LIM
+I
LIM
250
T
C
= -25
C
T
C
= 25
C
T
C
= 85
C
12
100
V
O
= 180V
PP
V
O
= 60V
PP
V
O
= 30V
PP
A
V
= 20
C
C
= 3.3pf
R
L
= 2K
+V
S
V
S
T = T
T = T
C
A
T = T
A
PA42
C
25C
OUT
25C +OUT
85C
OUT
25C
OUT
85C +OUT
25C +OUT
14
16
18
OPERATING
CONSIDERATIONS
PA41/PA42 PA41A/PA42A
GENERAL
Please read Application Note 1 "General Operating Consid-
erations" which covers stability, supplies, heat sinking, mount-
ing, current limit, SOA interpretation, and specification inter-
pretation. 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 Work-
book; and Evaluation Kits.
CURRENT LIMIT
For proper operation the current limit resistor, R
CL
, must be
connected as shown in the external connection diagram. The
minimum value is 18 ohms, however for optimum reliability the
resistor value should be set as high as possible. The value can
be estimated as follows with the maximum practical value of
500 ohms.
3
R
CL
=
I
LIM
Use the typical performance graphs as a guide for expected
variations in current limit value with a given R
CL
and variations
over temperature. The selected value of R
CL
must be added to
the specified typical value of output resistance to calculate the
total output resistance. Since the load current passes through
R
CL
the value selected also affects the output voltage swing
according to:
V
R
= I
O
R
CL
where V
R
is the voltage swing reduction.
When the amplifier is current limiting, there may be small
signal spurious oscillation present during the current limited
portion of the negative half cycle. The frequency of the oscil-
lation is not predictable and depends on the compensation,
gain of the amplifier, and load. The oscillation will cease as the
amplifier comes out of current limit.
INPUT PROTECTION
The PA41/42 inputs are protected against common mode
voltages up the supply rails and differential voltages up to
16
volts as well as static discharge. Differential voltages exceed-
ing 16 volts will be clipped by the protection circuitry. However,
if more than a few milliamps of current is available from the
overload source, the protection circuitry could be destroyed.
The protection circuitry includes 300 ohm current limiting
resistors at each input, but this may be insufficient for severe
overloads. It may be necessary to add external resistors to the
application circuit where severe overload conditions are ex-
pected. Limiting input current to 1mA will prevent damage.
STABILITY
The PA41/42 has sufficient phase margin when compen-
sated for unity gain to be stable with capacitive loads of at least
10 nF. However, the low pass circuit created by the sumpoint
(in) capacitance and the feedback network may add phase
shift and cause instabilities. As a general rule, the sumpoint
load resistance (input and feedback resistors in parallel)
should be 5K ohm or less at low gain settings (up to 10).
Alternatively, use a bypass capacitor across the feedback
resistor. The time constant of the feedback resistor and
bypass capacitor combination should match the time constant
of the sumpoint resistance and sumpoint capacitance.
The PA41/42 is externally compensated and performance
can be tailored to the application. Use the graphs of small
signal gain and phase response as well as the graphs for slew
rate and power response as a guide. The compensation
capacitor C
C
must be rated at 350V working voltage. The
compensation capacitor and associated resistor R
C
must be
mounted closely to the amplifier pins to avoid spurious oscilla-
tion. An NPO capacitor is recommended for compensation.
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 die metallization.
2. The temperature of the output MOSFETs.
NOTE: The output stage is protected against transient
flyback. However, for protection against sustained, high en-
ergy flyback, external fast-recovery diodes should be used.
*
SUPPLY TO OUTPUT DIFFERENTIAL, V
S
-V
O
(V)
10
20
30
50
100
200
300
500
OUTPUT CURRENT FROM +V
S
OR
V
S
, (mA)
2
3
4
5
10
20
30
40
50
100
DC, T
C
= 125
C
DC, T
C
= 85
C
DC
PULSE CURVES @ 10% DUTY CYCLE MAX
PA42 SOA
SUPPLY TO OUTPUT DIFFERENTIAL, V
S
-V
O
(V)
10
20
30
50
100
200
300
500
OUTPUT CURRENT FROM +V
S
OR
V
S
, (mA)
2
3
4
5
10
20
30
40
50
100
DC, T
C
= 125
C
DC, T
C
= 85
C
DC
300mS
PULSE CURVES @ 10% DUTY CYCLE MAX
PA41 SOA
200mS
120
200
100mS
200mS
300mS
120
200
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.
PA41/42U REV. G JANUARY 1999
1999 Apex Microtechnology Corp.
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