APEX PA141

HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS
PA141/PA142 • PA141A/PA142A
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—CPA141
APPLICATIONS
•
•
•
•
•
TYPICAL APPLICATION
PIEZO ELECTRIC POSITIONING
ELECTROSTATIC TRANSDUCER & DEFLECTION
DEFORMABLE MIRROR FOCUSING
BIOCHEMISTRY STIMULATORS
COMPUTER TO VACUUM TUBE INTERFACE
Ref: APPLICATION NOTE 20: "Bridge Mode Operation of Power Amplifiers"
20R
R
20R
20R
V IN
+175
+175
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
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 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.
A1
EXTERNAL CONNECTIONS
(8) 2 Q6
COMP
(1) 5
–IN
D4
D5
(2) 6
+IN
COMP Q8
(9) 3
Q7
Q9
1
Q12
Q13
5
8
6
–VS
+IN
5
PA141 PIN NUMBER
(1) PA142 PIN NUMBER
7
+VS
2
3
RS
100 Ω
PA141
–IN
PA142
RC
2.2K
2.2K
2.2K
CS ,CC ARE NPO RATED
FOR FULL SUPPLY VOLTAGE.
R CL = 3
I LIM
TOP VIEW
Q10
Q14
CC
18pF
10pF
3.3pF
CS
330pF
TOP VIEW
NC
–VS
7
(5)
I LIM
4
1
Q11
Gain
1
10
30
2 COMP
–IN
4 (10)
OUT
PHASE
COMPENSATION
CC
RC
I LIM
1 (7)
Q5
–175
Two PA141/PA142 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.
OUT
Q3
Cn
LOW COST 660V p-p
PIEZO DRIVE
–175
COMP 3
Q2
Rn
PIEZO
180 TRANSDUCER 180
100 Ω
100 Ω
330pF
330pF
8 (6)
+VS
Q1
PA141/142
R CL
R CL
R CL
D1
Q4
A2
PA141/142
EQUIVALENT SCHEMATIC
D3
2.2K
2.2K
DESCRIPTION
D2
10-PIN SIP
PACKAGE STYLE DW
8-PIN TO-3
PACKAGE STYLE CE
+IN
4
5
NC –VS
6
+VS I LIM
RS
100Ω
CS
330pf
7
8
9
CC
RC
CC
10
OUT
CC
RCL
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 [email protected]
1
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PA141/PA142 • PA141A/PA142A
ABSOLUTE MAXIMUM RATINGS
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)
SPECIFICATIONS
TEST CONDITIONS1
PARAMETER
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
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
RESISTANCE6, no load
RESISTANCE6, 20 mA load
POWER SUPPLY
VOLTAGE3
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.
CAUTION
MIN
PA141/PA142
TYP
MAX
RL = 5K
±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
PA141A/PA142A
MIN
TYP
MAX
UNITS
15
40/*
*
*
*
*
*
mV
µV/°C
µV/V
µV kh
pA
pA/V
pA
25
40
70
130
20
32
75
5/100 50/2000
.2/.5
.5/50
2.5/100 50/400
1011
5
Full temperature range
VCM = ±90V DC
10kHz BW, RS = 1K
1-10 Hz
PA141/PA141A
PA142/PA142A
350V
350V
60 mA
60 mA
120 mA
120 mA
12W
9W
±16 V
±16 V
±VS
±VS
300°C
220°C
150°C
150°C
–65 to +150°C
–65 to +150°C
–40 to +125°C
–40 to +125°C
106
1.6
26
60
±50
–25
*
*
±VS–12 ±VS–10
120
60
12
40
10
150
25
*
*
*
*
*
*
94
50
110
30
65/*
*
*
*
*
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
*
1.4
*
1.8
V
mA
*
*
*
*
*
*
*
*
*
*
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C
*
*
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.
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
2
PA141/PA142 • PA141A/PA142A
POWER DERATING
CURRENT LIMIT
PA142
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
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
–210
CC = 10pF
1
SLEW RATE
50
VO = 30VPP
VO = 180VPP
VO = 60VPP
.02
COMMON MODE REJECTION, CMR (dB)
.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
FREQUENCY, F (Hz)
1M
SLEW RATE, V/µs
.1
.06
.04
–20
-I LIM
–40
–60
0
300
400
500
100
200
CURRENT LIMIT RESISTOR, R CL (Ω
Ω )
40
30
20
10
0
0
4
8
12
16
20
COMPENSATION CAPACITANCE, C C (pf)
POWER SUPPLY REJECTION
120
100
+VS
80
60
–VS
40
20
0
1
R L = 10K Ω
200
CC = 10pF
100
80
10
100 1K 10K .1M
FREQUENCY, F (Hz)
1M
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
AV = 20
CC = 3.3pf
R L = 2K Ω
POWER SUPPLY REJECTION, PSR (dB)
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
9
130
OUTPUT VOLTAGE, VO (VPP )
PA141
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
TC
5°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
OUT
– OUT
25°C
– OUT
–25°C
10
8
6
T
–25°C +OU
UT
85°C +O
4
2
0
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 [email protected]
3
PA141/PA142 • PA141A/PA142A
OPERATING
CONSIDERATIONS
GENERAL
INPUT PROTECTION
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 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, 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.
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 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
4
OPERATING
CONSIDERATIONS
PA141/PA142 • PA141A/PA142A
SAFE OPERATING AREA (SOA)
APPLICATION REFERENCES:
The MOSFET output stage of this power operational
amplifier has two distinct limitations:
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
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
PA141 SOA
OUTPUT CURRENT FROM +VS OR –VS, (mA)
120
200mS
100
300mS
50
40
DC
DC
,T
30
C
20
=
85
°C
DC
,T
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)
PA142 SOA
OUTPUT CURRENT FROM +VS OR –VS, (mA)
120
30
100
DC
30
20
DC
C
10
=
S
S
DC
,T
C
,T
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
assumed
for possible• inaccuracies
or omissions.
All specifi
subject to change without notice.
APEX
MICROTECHNOLOGY
CORPORATION
• TELEPHONE
(520)
690-8600
• FAX is(520)
888-3329
ORDERS (520)
690-8601
• cations
EMAILare
[email protected]
PA141/142U REV. A MARCH 2002 © 2002 Apex Microtechnology Corp.
5