ETC PA41A

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA41/PA42 • PA41A/PA42A
HTTP://WWW.APEXMICROTECH.COM
M I C R O T E C H N O L O G Y
(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—PA41DIE
TYPICAL APPLICATION
APPLICATIONS
•
•
•
•
•
20R
R
PIEZO ELECTRIC POSITIONING
ELECTROSTATIC TRANSDUCER & DEFLECTION
DEFORMABLE MIRROR FOCUSING
BIOCHEMISTRY STIMULATORS
COMPUTER TO VACUUM TUBE INTERFACE
20R
V IN
+175
+175
10pF
10pF
A1
PA41/42
A2
PA41/42
R CL
R CL
Rn
PIEZO
180 TRANSDUCER 180
100 Ω
100 Ω
330pF
330pF
The PA41/42 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
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.
8 (6)
+VS
D1
EXTERNAL CONNECTIONS
R CL
OUT
PHASE
COMPENSATION
CC
RC
Gain
1
≥10
≥30
2 COMP
1
I LIM
4
Q3
Q4
Q5
(8) 2 Q6
COMP
(1) 5
–IN
D4
D5
(2) 6
+IN
COMP Q8
(9) 3
Q11
Q12
Q13
I LIM
1 (7)
PA41
4 (10)
OUT
PA42
–VS
+IN
7
RC
2.2KΩ
2.2KΩ
2.2KΩ
RS
100 Ω
+VS
C S , C C ARE NPO RATED
FOR FULL SUPPLY VOLTAGE.
R CL =
3
I LIM
Q7
Q9
TOP VIEW
1
2
3
NC
Q10
–IN
Q14
5
8
6
CC
18pF
10pF
3.3pF
CS
330pF
TOP VIEW
–IN
Q2
–175
Two PA41/42 amplifiers operated as a bridge driver for a
piezo transducer provides a low cost 660 volt total drive 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 matching bandwidths.
5
Q1
Cn
LOW COST 660V p-p
PIEZO DRIVE
–175
COMP 3
EQUIVALENT SCHEMATIC
D3
2.2K
2.2K
DESCRIPTION
D2
20R
PA41 PIN NUMBER
(1) PA42 PIN NUMBER
–VS
7
(5)
+IN
4
5
NC –VS
6
+VS I LIM
RS
100Ω
CS
330pf
7
8
9
CC
RC
CC
10
OUT
CC
RCL
NOTE: PA41 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 [email protected]
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ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PA41/PA42 • PA41A/PA42A
PA41/PA41A
PA42/PA42A
SUPPLY VOLTAGE, +VS to –VS
350V
350V
OUTPUT CURRENT, continuous within SOA
60 mA
60 mA
OUTPUT CURRENT, peak
120 mA
120 mA
POWER DISSIPATION, continuous @ TC = 25°C 12W
9W
INPUT VOLTAGE, differential
±16 V
±16 V
INPUT VOLTAGE, common mode
±VS
±VS
TEMPERATURE, pin solder – 10 sec
300°C
220°C
TEMPERATURE, junction2
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
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature4, 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, peak5
CURRENT, continuous
SETTLING TIME to .1%
SLEW RATE
CAPACITIVE LOAD
RESISTANCE 6, no load
RESISTANCE 6, 20mA load
POWER SUPPLY
VOLTAGE3
CURRENT, quiescent
THERMAL
PA41 RESISTANCE, AC junction to case
PA42 RESISTANCE, AC junction to case
PA41 RESISTANCE, DC junction to case
PA42 RESISTANCE, DC junction to case
PA41 RESISTANCE, junction to air
PA42 RESISTANCE, junction to air
TEMPERATURE RANGE, case
NOTES:
*
1.
2.
3.
4.
5.
6.
7.
CAUTION
PA41/PA42
TEST CONDITIONS1
PARAMETER
MIN
Full temperature range
VCM = ±90V DC
10kHz BW, RS = 1KΩ
1-10 Hz
RL = 5KΩ
±VS–12
84
94
CC = 10pf, 280V p-p
Full temperature range
IO = 40mA
CC = 10pF, 10V step, AV = –10
CC = OPEN
AV = +1
RCL = 0
RCL = 0
See Note 3
F > 60Hz
F > 60Hz
F < 60Hz
F < 60Hz
Full temperature range
Full temperature range
Meets full range specifications
TYP
PA41A/PA42A
MAX
25
40
70
130
20
32
75
5/100 50/2000
.2/.5
.5/50
2.5/100 50/400
1011
5
*
*
94
50
110
106
1.6
26
60
*
±VS–12 ±VS–10
120
60
12
40
10
150
25
±50
–25
MIN
TYP
MAX
UNITS
15
40/*
*
*
*
*
*
*
*
30
65/*
*
*
*
*
mV
µV/°C
µV/V
µV √kh
pA
pA/V
pA
Ω
pF
V
dB
µV RMS
µV p-p
*
*
*
*
dB
MHz
kHz
°
*
*
*
±VS–10 ±VS–8.5
*
*
*
*
*
*
*
±150
1.6
±175
2.0
5.4
7
9
12
30
55
6.5
10
10.4
14
+85
*
.9
V
mA
mA
µs
V/µs
nF
Ω
Ω
*
1.4
*
1.8
V
mA
*
*
*
*
*
*
*
*
*
*
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C
*
*
The specification for PA41A/PA42A is identical to the specification for PA41/PA42 in applicable column to the left.
Unless otherwise noted TC = 25°C, CC = 18pF, RC = 2.2KΩ. 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 PA41 and PA42 respectively.
The PA41/PA42 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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PA41/PA42 • PA41A/PA42A
POWER DERATING
CURRENT LIMIT
9
PA42
6
T = TA
3
T = TA
0
0
25
50
75
100
TEMPERATURE, T (°C)
125
120
–I LIM
110
+I LIM
100
90
80
–50 –25 0 25 50 75 100 125
CASE TEMPERATURE, TC (°C)
SMALL SIGNAL RESPONSE
100
–30
CC = 3.3pF
–60
CC = 10pF
PHASE, ϕ (°)
OPEN LOOP GAIN, A(dB)
0
CC = 3.3pF
CC = 10pF
60
40
CC = 18pF
0
–180
–20
1
–210
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
CC = 10pF
1
.1
.06
.04
SLEW RATE
AV = 20
CC = 3.3pf
R L = 2K Ω
50
VO = 30VPP
VO = 180VPP
VO = 60VPP
.02
.01
.006
.004
30
20
0
COMMON MODE REJECTION
120
100
80
60
40
20
0
1
10
100 1K 10K .1M
FREQUENCY, F (Hz)
1M
0
4
8
12
16
20
COMPENSATION CAPACITANCE, C C (pf)
POWER SUPPLY REJECTION, PSR (dB)
COMMON MODE REJECTION, CMR (dB)
40
10
.002
100 200 1K 3K 10K 30K 100K
FREQUENCY, F (Hz)
–20
-I LIM
–40
–60
100
200
0
300
400
500
CURRENT LIMIT RESISTOR, R CL ( Ω )
POWER SUPPLY REJECTION
120
100
+VS
80
60
–VS
40
20
0
1
10
100 1K 10K .1M
FREQUENCY, F (Hz)
1M
R L = 10K Ω
200
CC = 10pF
100
80
CC = 3.3pF
60
40
CC = 18pF
20
10K 20K30K 50K .1M .2M .3M .5M
FREQUENCY, F (Hz)
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
60
SLEW RATE, V/µs
DISTORTION, (%)
.2
CC = 18pF
CC = 3.3pF
HARMONIC DISTORTION
1.0
.6
.4
0
POWER RESPONSE
CC = 18pF
–120
–150
+I LIM
20
400
–90
20
40
PHASE RESPONSE
120
80
CURRENT LIMIT RANGE, I (mA)
T = TC
130
OUTPUT VOLTAGE, VO (VPP )
PA41
60
NORMALIZED QUIESCENT CURRENT, (%)
T = TC
12
CURRENT LIMIT
140
1M
QUIESCENT CURRENT
150
130
110
VOLTAGE DROP FROM SUPPLY, VS – VO (V)
15
NORMALIZED CURRENT LIMIT, (%)
INTERNAL POWER DISSIPATION, P(W)
TYPICAL PERFORMANCE
GRAPHS
5°C
T
C
=8
90
5°C
TC
=2
5°C
70
TC
= -2
50
100 150
300
350
200
250
TOTAL SUPPLY VOLTAGE, VS (V)
OUTPUT VOLTAGE SWING
18
16
14
85°C
12
T
– OU
– OUT
25°C
– OUT
–25°C
10
8
6
T
–25°C +OU
85°C +OUT
4
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 [email protected]
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OPERATING
CONSIDERATIONS
PA41/PA42 • PA41A/PA42A
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.
3
RCL =
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 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 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 PA41/42 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.
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
PA41 SOA
120
OUTPUT CURRENT FROM +VS OR –VS, (mA)
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.
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 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.
200mS
100
300mS
50
40
DC
DC
,T
30
C
20
=
85
DC
,T
C
=
°C
12
5°
10
C
5
4
3
PULSE CURVES @ 10% DUTY CYCLE MAX
2
10
200
20 30
50
100
200 300
500
SUPPLY TO OUTPUT DIFFERENTIAL, VS -VO (V)
PA42 SOA
120
OUTPUT CURRENT FROM +VS OR –VS, (mA)
GENERAL
30
100
20
C
,T
C
10
DC
,T
DC
=
S
S
DC
30
m
0m
S
50
40
10
0
20
0m
=
85
°C
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, VS -VO (V)
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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