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MICROTECHNOLOGY
HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA141/PA142 • PA141A/PA142A
HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739
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—CPA141
APPLICATIONS
8-PIN TO-3
PACKAGE STYLE CE
10-PIN SIP
PACKAGE STYLE DW
• PIEZO ELECTRIC POSITIONING
• ELECTROSTATIC TRANSDUCER & DEFLECTION
• DEFORMABLE MIRROR FOCUSING
• BIOCHEMISTRY STIMULATORS
• COMPUTER TO VACUUM TUBE INTERFACE
TYPICAL APPLICATION
Ref: APPLICATION NOTE 20: "Bridge Mode Operation of Power Amplifiers"
R 20R
20R
V IN +175
2.2K
20R
+175
2.2K
DESCRIPTION
10pF
10pF
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
A1
PA141/142 RCL
180
100
PIEZO
TRANSDUCER
R CL
A2
PA141/142
180
100
Rn
Cn
and differential mode voltages. The safe operating
330pF
330pF
area (SOA) has no second breakdown limitations and
can be observed with all type loads by choosing
an appropriate current limiting resistor. External com-
LOW COST 660V p-p
–175
PIEZO DRIVE
–175
pensation provides the user flexibility in choosing
Two PA141/PA142 amplifiers operated as a bridge driver
optimum gain and bandwidth for the application.
for a piezo transducer provides a low cost 660 volt total drive
The PA141 is packaged in a hermetically sealed TO-3
and all circuitry is isolated from the case by an aluminum
nitride (AlN) substrate.
capability. The RN CN network serves to raise the apparent
gain of A2 at high frequencies. If RN is set equal to R the
amplifiers can be compensated identically and will have
The PA142 is packaged in APEX’s hermetic ceramic matching bandwidths.
SIP package.
EXTERNAL CONNECTIONS
EQUIVALENT SCHEMATIC
R CL
PHASE
8 (6)
RC CC
COMPENSATION
D1
+VS
COMP 3
2 COMP
1 I LIM
Gain
1
10
CC
18pF
10pF
RC
2.2K
2.2K
Q1 Q2
OUT 4
30 3.3pF 2.2K
Q3 I LIM
TOP VIEW
CS
330pF
(1) 5
–IN
(2) 6
+IN
Q4 Q5
D2 D3 D4 D5
(8) 2 Q6
COMP
COMP Q8
(9) 3
Q11
Q12
Q13
Q7
Q9
Q10
Q14
5 PA141 PIN NUMBER
(1) PA142 PIN NUMBER
1 (7)
4 (10)
OUT
5
–IN
6
+IN
PA141
7
–VS
8
+VS
RS
100
CS ,CC ARE NPO RATED
FOR FULL SUPPLY VOLTAGE.
RCL =
3
I LIM
TOP VIEW
1 2 3 4 5 6 7 8 9 10
NC NC –VS +VS ILIM
CC CC OUT
RS
100
RC
–IN +IN
CS
330pf
CC
–VS PA142
7
RCL
(5) 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
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PA141/PA142 • PA141A/PA142A
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, continuous within SOA
OUTPUT CURRENT, peak
POWER DISSIPATION, continuous @ TC = 25°C
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder – 10 sec
TEMPERATURE, junction2
TEMPERATURE, storage
TEMPERATURE RANGE, powered (case)
PA141/PA141A PA142/PA142A
350V
350V
60 mA
60 mA
120 mA
120 mA
12W
9W
±16 V
±16 V
±VS
300°C
±VS
220°C
150°C
150°C
–65 to +150°C
–65 to +150°C
–40 to +125°C
–40 to +125°C
TEST CONDITIONS1
PA141/PA142
PA141A/PA142A
MIN TYP MAX MIN TYP MAX UNITS
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature4, 7
OFFSET VOLTAGE, vs supply
OFFSET VOLTAGE, vs time
BIAS CURRENT, initial7
BIAS CURRENT, vs supply
OFFSET CURRENT, initial7
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE, voltage range
COMMON MODE REJECTION, DC
NOISE, broad band
NOISE, low frequency
Full temperature range
VCM = ±90V DC
10kHz BW, RS = 1K
1-10 Hz
GAIN
OPEN LOOP at 15Hz
BANDWIDTH, open loop
POWER BANDWIDTH
PHASE MARGIN
RL = 5K
CC = 10pf, 280V p-p
Full temperature range
OUTPUT
VOLTAGE SWING
CURRENT, peak5
CURRENT, continuous
SETTLING TIME to .1%
SLEW RATE
CAPACITIVE LOAD
RESISTANCE6, no load
RESISTANCE6, 20 mA load
POWER SUPPLY
VOLTAGE3
CURRENT, quiescent
IO = 40mA
CC = 10pF, 10V step, AV = 10
CC = OPEN
AV = +1
RCL = 0
RCL = 0
See Note 3
THERMAL
PA141 RESISTANCE, AC junction to case F > 60Hz
PA142 RESISTANCE, AC junction to case F > 60Hz
PA141 RESISTANCE, DC junction to case F < 60Hz
PA142 RESISTANCE, DC junction to case F < 60Hz
PA141 RESISTANCE, junction to air
Full temperature range
PA142 RESISTANCE, junction to air
Full temperature range
TEMPERATURE RANGE, case
Meets full range specifications
25 40
70 130
20 32
75
5/100 50/2000
.2/.5 .5/50
2.5/100 50/400
1011
5
±VS–12
84
94
50
110
*
*
15 30 mV
40/* 65/* µV/°C
* * µV/V
* µV kh
* * pA
* * pA/V
* * pA
*
* pF
V
* dB
* µV RMS
* µV p-p
94 106
1.6
26
60
**
*
*
*
dB
MHz
kHz
°
±VS–12
120
60
10
±VS–10
12
40
150
25
±VS–10 ±VS–8.5
*
*
*
*
*
*
*
V
mA
mA
µs
V/µs
nF
±50 ±150 ±175 *
*
*
V
1.6 2.0 .9 1.4 1.8 mA
5.4 6.5
7 10
9 10.4
12 14
30
55
–25 +85 *
*
*
*
*
*
*
* °C/W
* °C/W
* °C/W
* °C/W
°C/W
°C/W
* °C
NOTES: *
1.
2.
3.
4.
5.
6.
7.
The specification for PA141A/PA142A is identical to the specification for PA141/PA142 in applicable column to the left.
Unless otherwise noted TC = 25°C, CC = 18pF, RC = 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 TC = 25°C.
Sample tested by wafer to 95%.
Guaranteed but not tested.
The selected value of RCL must be added to the values given for total output resistance.
Specifications separated by / indicate values for the PA141 and PA142 respectively.
CAUTION
The PA141/PA142 is constructed from MOSFET transistors. ESD handling procedures must be observed.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
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TYPICAL PERFORMANCE
GRAPHS
PA141/PA142 • PA141A/PA142A
POWER DERATING
15
T = TC
12
T = TC
9
PA141
PA142
6
T = TA
3
T = TA
0
0 25 50 75 100
TEMPERATURE, T (°C)
125
SMALL SIGNAL RESPONSE
120
100
CC = 3.3pF
80
60 CC = 10pF
40
CC = 18pF
20
0
–20
1
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
HARMONIC DISTORTION
1.0
.6 AV = 20
.4 CC = 3.3pf
.2 RL = 2K
.1 VO = 30VPP
.06
.04
VO = 180VPP
VO = 60VPP
.02
.01
.006
.004
.002
100 200 1K 3K 10K 30K 100K
FREQUENCY, F (Hz)
COMMON MODE REJECTION
120
100
80
60
40
20
0
1 10 100 1K 10K .1M 1M
FREQUENCY, F (Hz)
CURRENT LIMIT
140
130
120
110
+I LIM
100
–I LIM
90
80
–50 –25 0 25 50 75 100 125
CASE TEMPERATURE, TC (°C)
PHASE RESPONSE
0
–30 CC = 3.3pF
–60 CC = 10pF CC = 18pF
–90
–120 CC = 18pF
–150
CC = 3.3pF
–180
–210
1
CC = 10pF
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
SLEW RATE
60
50
40
30
20
10
0
0 4 8 12 16 20
COMPENSATION CAPACITANCE, CC (pf)
POWER SUPPLY REJECTION
120
100
80 +VS
60 –VS
40
20
0
1 10 100 1K 10K .1M 1M
FREQUENCY, F (Hz)
CURRENT LIMIT
60
40
+I LIM
20
0
–20
-I LIM
–40
–60
0 100 200 300 400 500
CURRENT LIMIT RESISTOR, R CL ()
POWER RESPONSE
400
RL = 10K
200
CC = 10pF
100
80
CC = 3.3pF
60
40
20
10K
CC = 18pF
20K30K 50K .1M .2M.3M .5M
FREQUENCY, F (Hz)
1M
QUIESCENT CURRENT
150
130
110 T C = 85°C
90 T C = 25°C
70 TC = -25°C
50
100 150 200 250 300 350
TOTAL SUPPLY VOLTAGE, VS (V)
OUTPUT VOLTAGE SWING
18
16
14 85°C –OUT
12
10 25°C – OUT
8 –25°C – OUT
6 –25°C +OUT
4 85°C +OUT
2
0 25°C +OUT
0 20 40 60 80 100 120
OUTPUT CURRENT, I O (mA)
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodlit@apexmicrotech.com
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PA141/PA142 • PA141A/PA142A
OPERATING
CONSIDERATIONS
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.
CURRENT LIMIT
For proper operation the current limit resistor, RCL, 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.
RCL = 3
ILIM
Use the typical performance graphs as a guide for expected
variations in current limit value with a given RCL and variations
over temperature. The selected value of RCL must be added
to the specified typical value of output resistance to calculate
the total output resistance. Since the load current passes
through RCL the value selected also affects the output voltage
swing according to:
VR = IO * RCL
where VR 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.
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.
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 CC must be rated at 350V working voltage.
The compensation capacitor and associated resistor RC
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
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OPERATING
CONSIDERATIONS
PA141/PA142 • PA141A/PA142A
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.
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
PA141 SOA
200
120
200mS
100
300mS
50
40
30
DC
DC, T
20
DC, T
C = 85°C
10 C = 125°C
5
4
3
PULSE CURVES @ 10% DUTY CYCLE MAX
2
10 20 30 50 100 200 300
500
SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V)
PA142 SOA
200
120
100
300mS
2001m0S0mS
50
40
30
DC, T DC
20
10
DC,
T
C
=
C = 85°C
125°C
5
4
3
PULSE CURVES @ 10% DUTY CYCLE MAX
2
10 20 30 50 100 200 300
500
SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V)
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PA141/142U REV. A MARCH 2002 © 2002 Apex Microtechnology Corp.
5