HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA141/PA142 • PA141A/PA142A
M I C R O T E C H N O L O G Y
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
•
•
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•
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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—CPA141
APPLICATIONS
•
•
•
•
•
PIEZO ELECTRIC POSITIONING
ELECTROSTATIC TRANSDUCER & DEFLECTION
DEFORMABLE MIRROR FOCUSING
BIOCHEMISTRY STIMULATORS
COMPUTER TO VACUUM TUBE INTERFACE
8-PIN TO-3
PACKAGE STYLE CE
TYPICAL APPLICATION
20R
+175
2.2K
10pF
A1
PA141/142
10-PIN SIP
PACKAGE STYLE DW
Ref: APPLICATION NOTE 20: "Bridge Mode Operation of Power Amplifiers"
R
V
IN
20R
20R
+175
2.2K
10pF
A2
R
CL
PIEZO
180 TRANSDUCER 180
100
Ω
100
Ω
330pF
330pF
R
CL
PA141/142
DESCRIPTION
The PA141/PA142 are high voltage monolithic MOSFET
operational 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 com-
pensation provides the user flexibility in choosing
optimum gain and bandwidth for the application.
The PA141 is packaged in a hermetically sealed TO-3
and all circuitry is isolated from the case by an aluminum
nitride (AlN) substrate.
The PA142 is packaged in APEX’s hermetic ceramic
SIP package.
Rn
Cn
–175
LOW COST 660V p-p
PIEZO DRIVE
–175
Two PA141/PA142 amplifiers operated as a bridge driver
for a piezo transducer provides a low cost 660 volt total drive
capability. 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
R
CL
R
C
COMP
3
C
C
2
COMP
1
EQUIVALENT SCHEMATIC
D1
Q1
Q2
Q3
Q4
(1) 5
–IN
D2
(2) 6
+IN
Q11
Q12
Q13
D3
D4
D5
Q5
(8) 2 Q6
COMP
COMP Q8
(9) 3
Q7
4 (10)
OUT
I
LIM
1 (7)
5
8 (6)
+V
S
PHASE
COMPENSATION
I
LIM
OUT
4
Gain
1
10
30
C
S
330pF
C
C
18pF
10pF
3.3pF
R
C
2.2K
2.2K
2.2K
TOP VIEW
–IN
6
8
+IN
–V
S
7
+V
S
R
S
100
Ω
C
S
,C
C
ARE NPO RATED
FOR FULL SUPPLY VOLTAGE.
R
CL
= 3
I
LIM
Q9
PA141
1
2
3
NC
4
TOP VIEW
5
6
+V
S
I
LIM
R
S
100Ω
C
S
330pf
7
8
C
C
R
C
9
C
C
10
OUT
Q10
Q14
–V
S
7
(5)
–IN
+IN
NC –V
S
C
C
R
CL
PA142
5
PA141 PIN NUMBER
(1) PA142 PIN NUMBER
NOTE:
PA141 Recommended mounting torque is 4-7 in•lbs
(.45 -.79 N•m)
CAUTION:
The use of compressible, thermally conductive
insulators may void warranty.
APEX MICROTECHNOLOGY CORPORATION
• TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
1
PA141/PA142 • PA141A/PA142A
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
to –V
S
OUTPUT CURRENT, continuous within SOA
OUTPUT CURRENT, peak
POWER DISSIPATION, continuous @ T
C
= 25°C
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder – 10 sec
TEMPERATURE, junction
2
TEMPERATURE, storage
TEMPERATURE RANGE, powered (case)
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PA141/PA141A
PA142/PA142A
350V
350V
60 mA
60 mA
120 mA
120 mA
12W
9W
±16 V
±16 V
±V
S
±V
S
300°C
220°C
150°C
150°C
–65 to +150°C
–65 to +150°C
–40 to +125°C
–40 to +125°C
PA141A/PA142A
MIN
TYP
MAX
15
40/*
*
*
*
*
*
*
SPECIFICATIONS
PARAMETER
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
4, 7
OFFSET VOLTAGE, vs supply
OFFSET VOLTAGE, vs time
BIAS CURRENT, initial
7
BIAS CURRENT, vs supply
OFFSET CURRENT, initial
7
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE, voltage range
COMMON MODE REJECTION, DC
NOISE, broad band
NOISE, low frequency
GAIN
OPEN LOOP at 15Hz
BANDWIDTH, open loop
POWER BANDWIDTH
PHASE MARGIN
OUTPUT
VOLTAGE SWING
CURRENT, peak
5
CURRENT, continuous
SETTLING TIME to .1%
SLEW RATE
CAPACITIVE LOAD
RESISTANCE
6
, no load
RESISTANCE
6
, 20 mA load
POWER SUPPLY
VOLTAGE
3
CURRENT, quiescent
THERMAL
PA141 RESISTANCE, AC junction to case
PA142 RESISTANCE, AC junction to case
PA141 RESISTANCE, DC junction to case
PA142 RESISTANCE, DC junction to case
PA141 RESISTANCE, junction to air
PA142 RESISTANCE, junction to air
TEMPERATURE RANGE, case
NOTES:
*
1.
2.
3.
4.
5.
6.
7.
TEST CONDITIONS
1
PA141/PA142
MIN
TYP
MAX
25
40
70
130
20
32
75
5/100 50/2000
.2/.5
.5/50
2.5/100 50/400
10
11
5
±V
S
–12
84
94
50
110
106
1.6
26
60
UNITS
mV
µV/°C
µV/V
µV kh
pA
pA/V
pA
pF
V
dB
µV RMS
µV p-p
dB
MHz
kHz
°
V
mA
mA
µs
V/µs
nF
Full temperature range
30
65/*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
V
CM
= ±90V DC
10kHz BW, R
S
= 1K
1-10 Hz
R
L
= 5K
C
C
= 10pf, 280V p-p
Full temperature range
I
O
= 40mA
C
C
= 10pF, 10V step, A
V
=
–
10
C
C
= OPEN
A
V
= +1
R
CL
= 0
R
CL
= 0
See Note 3
94
*
±V
S
–12 ±V
S
–10
120
60
12
40
10
150
25
±50
±150
1.6
5.4
7
9
12
30
55
–25
±175
2.0
6.5
10
10.4
14
+85
±V
S
–10 ±V
S
–8.5
*
*
*
*
*
*
*
*
.9
*
1.4
*
*
*
*
*
*
*
*
1.8
*
*
*
*
*
V
mA
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C
F > 60Hz
F > 60Hz
F < 60Hz
F < 60Hz
Full temperature range
Full temperature range
Meets full range specifications
The specification for PA141A/PA142A is identical to the specification for PA141/PA142 in applicable column to the left.
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.
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.
Derate maximum supply voltage .5 V/°C below case temperature of 25°C. No derating is needed above T
C
= 25°C.
Sample tested by wafer to 95%.
Guaranteed but not tested.
The selected value of R
CL
must be added to the values given for total output resistance.
Specifications separated by / indicate values for the PA141 and PA142 respectively.
The PA141/PA142 is constructed from MOSFET transistors. ESD handling procedures must be observed.
CAUTION
2
APEX MICROTECHNOLOGY CORPORATION
• 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
TYPICAL PERFORMANCE
GRAPHS
PA141/PA142 • PA141A/PA142A
CURRENT LIMIT
NORMALIZED CURRENT LIMIT, (%)
140
130
120
110
+I
LIM
100
90
80
–50 –25 0 25 50 75 100 125
CASE TEMPERATURE, T
C
(°C)
0
–30
–I
LIM
60
INTERNAL POWER DISSIPATION, P(W)
POWER DERATING
15
12
9
6
T = T
A
3
T = T
A
0
0
25
50
75
100
TEMPERATURE, T (°C)
125
T = T
C
PA141
T = T
C
PA142
CURRENT LIMIT
CURRENT LIMIT RANGE, I (mA)
40
20
0
–20
–40
–60
+I
LIM
-I
LIM
0
300
400
500
100
200
CURRENT LIMIT RESISTOR, R
CL
(Ω )
Ω
SMALL SIGNAL RESPONSE
120
PHASE RESPONSE
400
C
C
= 3.3pF
C
C
= 10pF
C
C
= 18pF
POWER RESPONSE
OUTPUT VOLTAGE, V
O
(V
PP
)
R
L
= 10K
Ω
200
C
C
= 10pF
100
80
60
40
C
C
= 18pF
20
10K 20K30K 50K .1M .2M .3M .5M
FREQUENCY, F (Hz)
C
C
= 3.3pF
OPEN LOOP GAIN, A(dB)
100
C
C
= 3.3pF
80
60
40
C
C
= 18pF
20
0
1
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
C
C
= 10pF
–60
PHASE,
ϕ
(°)
–90
–120
–150
–180
–210
C
C
= 10pF
1
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
C
C
= 18pF
C
C
= 3.3pF
–20
1M
HARMONIC DISTORTION
1.0
.6
.4
60
A
V
= 20
C
C
= 3.3pf
R
L
= 2K
Ω
V
O
= 30V
PP
V
O
= 180V
PP
V
O
= 60V
PP
50
SLEW RATE
NORMALIZED QUIESCENT CURRENT, (%)
QUIESCENT CURRENT
150
130
110
SLEW RATE, V/µs
DISTORTION, (%)
.2
.1
.06
.04
.02
40
30
20
10
0
0
4
8
12
16
20
COMPENSATION CAPACITANCE, C
C
(pf)
T
C
90
5
°
C
=8
=2
5
°
C
5
°
C
.01
.006
.004
.002
100 200 1K 3K 10K 30K 100K
FREQUENCY, F (Hz)
120
100
80
60
40
20
0
1
10
100 1K 10K .1M
FREQUENCY, F (Hz)
1M
T
C
70
T
C
= -2
50
100 150
300
350
200
250
TOTAL SUPPLY VOLTAGE, V
S
(V)
COMMON MODE REJECTION, CMR (dB)
POWER SUPPLY REJECTION, PSR (dB)
COMMON MODE REJECTION
POWER SUPPLY REJECTION
120
100
80
60
40
20
0
1
10
100 1K 10K .1M
FREQUENCY, F (Hz)
1M
–V
S
+V
S
VOLTAGE DROP FROM SUPPLY, V
S
– V
O
(V)
OUTPUT VOLTAGE SWING
18
16
14
12
10
8
6
4
2
0
–
85
°
C
OUT
– OUT
25
°
C
– OUT
–25
°
C
T
–25
°C
+OU
85
°C
+OUT
25°C +OUT
0
40
60 80 100 120
20
OUTPUT CURRENT, I
O
(mA)
APEX MICROTECHNOLOGY CORPORATION
• TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
3
PA141/PA142 • PA141A/PA142A
GENERAL
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.
OPERATING
CONSIDERATIONS
INPUT PROTECTION
The PA141/142 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
exceeding 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 expected. Limiting input current to 1mA will
prevent damage.
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 oscillation 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.
STABILITY
The PA141/142 has sufficient phase margin when
compensated 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 PA141/142 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 oscillation. An NPO capacitor is recommended
for compensation.
APEX MICROTECHNOLOGY CORPORATION
• 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
4
OPERATING
CONSIDERATIONS
PA141/PA142 • PA141A/PA142A
APPLICATION REFERENCES:
For additional technical information please refer to the
following Application Notes:
AN 1: General Operating Considerations
AN 3: Bridge Circuit Drives
AN 25: Driving Capacitive Loads
AN 38: Loop Stability with Reactive Loads
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational
amplifier 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 energy
flyback, external fast-recovery diodes should be used.
200
OUTPUT CURRENT FROM +V
S
OR –V
S
, (mA)
PA141 SOA
120
100
300mS
50
40
30
20
DC
DC
200mS
DC
,T
C
=
85
°
C
,T
C
=
10
12
5
°
C
5
4
3
PULSE CURVES @ 10% DUTY CYCLE MAX
2
10
20 30
50
100
200 300
500
SUPPLY TO OUTPUT DIFFERENTIAL, V
S
-V
O
(V)
200
OUTPUT CURRENT FROM +V
S
OR –V
S
, (mA)
PA142 SOA
10
0
0m
S
120
30
0m
S
100
20
m
S
50
40
30
20
DC
,T
DC
DC
,T
C
=
C
=
85
°
C
12
10
5
°
C
5
4
3
PULSE CURVES @ 10% DUTY CYCLE MAX
2
10
20 30
50
100
200 300
500
SUPPLY TO OUTPUT DIFFERENTIAL, V
S
-V
O
(V)
This
MICROTECHNOLOGY CORPORATION
• TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS
or omissions. All specifi
EMAIL prodlit@apexmicrotech.com
APEX
data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies
(520) 690-8601 •
cations are subject to change without notice.
PA141/142U REV. A MARCH 2002 © 2002 Apex Microtechnology Corp.
5
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