CIRRUS PA84A

POWER OPERATIONAL AMPLIFIERS
PA84 • PA84A • PA84S
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
• HIGH SLEW RATE — 200V/µs
• FAST SETTLING TIME — .1% in 1µs (PA84S)
• FULLY PROTECTED INPUT — Up to ±150v
• LOW BIAS CURRENT, LOW NOISE — FET Input
• WIDE SUPPLY RANGE — ±15V to ±150V
APPLICATIONS
100K 50K
• HIGH VOLTAGE INSTRUMENTATION
• ELECTROSTATIC TRANSDUCERS & DEFLECTION
• PROGRAMMABLE POWER SUPPLIES UP TO 290V
• ANALOG SIMULATORS
+150V
4.7K
DAC
DESCRIPTION
390pF
±10V
10K
The PA84 is a high voltage operational amplifier designed for
output voltage swings up to ±145V with a dual supply or 290V
with a single supply. Two versions are available. The new
PA84S, fast settling amplifier can absorb differential input overvoltages up to ±50V while the established PA84 and PA84A can
handle differential input overvoltages of up to ±300V. Both
versions are protected against common mode transients and
overvoltages up to the supply rails. High accuracy is achieved
with a cascode input circuit configuration. All internal biasing is
referenced to a zener diode fed by a FET constant current
source. As a result, the PA84 features an unprecedented supply
range and excellent supply rejection. The output stage is biasedon for linear operation. External phase compensation allows for
user flexibility in obtaining the maximum slew rate. Fixed current
limits protect these amplifiers against shorts to common at
supply voltages up to 150V. For operation into inductive loads,
two external flyback pulse protection diodes are recommended.
However, a heatsink may be necessary to maintain the proper
case temperature under normal operating conditions.
This hybrid integrated circuit utilizes a beryllia (BeO) substrate, thick film resistors, ceramic capacitors and semiconductor chips to maximize reliability, minimize size and give top
performance. Ultrasonically bonded aluminum wires provide
reliable interconnections at all operating temperatures. The 8pin TO-3 package is hermetically sealed and electrically
isolated. The use of compressible thermal isolation washers
and/or improper mounting torque will void the product warranty. Please see “General Operating Considerations”.
PA84
INK JET
CONTROL
......
......
......
–150V
TYPICAL APPLICATION
The PA84 is ideally suited to driving ink jet control units
(often a piezo electric device) which require precise pulse
shape control to deposit crisp clear date or lot code information
on product containers. The external compensation network
has been optimized to match the gain setting of the circuit and
the complex impedance of the ink jet control unit. The combination of speed and high voltage capabilities of the PA84 form
ink droplets of uniform volume at high production rates to
enhance the value of the printer.
EQUIVALENT SCHEMATIC
4
2
C1
D1
3
Q3
Q2
Q1
Q4
Q5
Q6
8
Q8
Q9
Q10
C5 *
EXTERNAL CONNECTION
*
3
2
+VS
1
OUT
CC
4
BAL
TOP VIEW
5
RC
–IN
6
+IN
8
7
–VS
COMP
GAIN
CC
RC
6
1
10
100
1000
10nF
500pF
50pF
none
200 Ω
2K Ω
20K Ω
none
7
Q11
Q12B
1
Q12A
5
PHASE COMPENSATION
BAL
C4
Q7
*
C6 *
Q13 *
Q14 *
Q16
Q17
Q15
D2
NOTES:
1. Phase Compensation required
for safe operation.
2. Input offset trimpot optional.
Recommended value 100K Ω .
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PA84 • PA84A • PA84S
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal at TC = 25°C2
INPUT VOLTAGE, differential PA84/PA84A1
INPUT VOLTAGE, differential PA84S
INPUT VOLTAGE, common mode1
TEMPERATURE, pins for 10s max (solder)
TEMPERATURE, junction2
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
300V
Internally Limited
17.5W
±300V
±50V
±VS
300°C
200°C
–65 to +150°C
–55 to +125°C
PA84/PA84S
PA84A
SPECIFICATIONS
PARAMETER
TEST CONDITIONS
3
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
±.5
±5
±.2
*
3
*
±1.5
*
*
*
*
*
±1
±10
mV
µV/°C
µV/V
µV/√kh
pA
pA/V
pA
pA/V
Ω
pF
V
dB
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. time
BIAS CURRENT, initial4
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial4
OFFSET CURRENT, vs. supply
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE5
COMMON MODE REJECTION, DC
TC
TC
TC
TC
TC
TC
TC
TC
TC
TC
TC
TC
= 25°C
= –25° to +85°C
= 25°C
= 25°C
= 25°C
= 25°C
= 25°C
= 25°C
= 25°C
= –25° to +85°C
= –25° to +85°C
= –25° to +85°C
TC
TC
TC
TC
TC
= 25°C, RL = ∞
= 25°C, RL = 3.5KΩ
= 25°C, RL = 3.5KΩ, RC = 20KΩ
= 25°C, RL = 3.5KΩ, RC = 20KΩ
= 25°C, RL = 3.5KΩ, RC = 20KΩ
±1.5
±10
±.5
±75
5
.01
±2.5
±.01
1011
6
±VS–10 ±VS–8.5
130
±3
±25
50
±50
*
10
±10
GAIN
OPEN LOOP GAIN at 10Hz
OPEN LOOP GAIN at 10Hz.
GAIN BANDWIDTH [email protected] 1MHz
POWER BANDWIDTH, high gain
POWER BANDWIDTH, low gain
100
120
118
75
250
120
*
180
*
*
*
*
*
dB
dB
MHz
kHz
kHz
*
*
V
V
mA
mA
V/µs
V/µs
µs
µs
µs
µs
OUTPUT
VOLTAGE SWING5
VOLTAGE SWING5
CURRENT, peak
CURRENT, short circuit
SLEW RATE, high gain
SLEW RATE, low gain
SETTLING TIME .01% at gain = 100
SETTLING TIME .1% at gain = 100
SETTLING TIME .01% at gain = 100
SETTLING TIME .1% at gain = 100
TC = 25°C, IO = ±40mA
±VS–7
TC = –25° to +85°C, IO = ±15mA
±VS–5
40
TC = 25°C
TC = 25°C
TC = 25°C, RL = 3.5KΩ, RC = 20KΩ
TC = 25°C, RL = 3.5KΩ, RC = 2KΩ
PA84S
TC = 25°C, RL = 3.5KΩ
RC = 20KΩ, VIN = 2V step ONLY
TC = 25°C, RL = 3.5KΩ
PA84/84A
RC = 20KΩ, VIN = 2V step
±VS–3
±VS–2
*
*
*
50
200
125
2
1
20
12
150
*
*
*
20
12
POWER SUPPLY
VOLTAGE
CURRENT, quiescent
TC = –55°C to +125°C
TC = 25°C
±15
5.5
±150
7.5
*
*
*
*
V
mA
*
°C/W
°C/W
°C/W
°C
THERMAL
RESISTANCE, AC, junction to case6
RESISTANCE, DC, junction to case
RESISTANCE, case to air
TEMPERATURE RANGE, case
NOTES:
*
1.
2.
3.
4.
5.
6.
CAUTION
TC = –55°C to +125°C, F > 60Hz
TC = –55°C to +125°C, F < 60Hz
TC = –55°C to +125°C
Meets full range specifications
3.8
6
30
–25
*
*
*
6.5
+85
*
*
The specification of PA84A is identical to the specification for PA84/PA84S in applicable column to the left.
Signal slew rates at pins 5 and 6 must be limited to less than 1V/ns to avoid damage. When faster waveforms are unavoidable,
resistors in series with those pins, limiting current to 150mA will protect the amplifier from damage.
Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation
to achieve high MTTF.
The power supply voltage for all tests is ±150V, unless otherwise noted as a test condition.
Doubles for every 10°C of temperature increase.
+VS and –VS denote the positive and negative power supply rail respectively.
Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
subject to temperatures in excess of 850°C to avoid generating toxic fumes.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
TYPICAL PERFORMANCE
GRAPHS
CURRENT LIMIT
80
25
70
CURRENT LIMIT, ILIM (mA)
10
5
0
0
50
40
30
20
–55 –25 0
25 50 75 100 125
CASE TEMPERATURE, TC (°C)
25
50
75 100 125 150
TEMPERATURE, TC (°C)
30
RL = 3.5K Ω
COMMON MODE REJECTION
120
100
80
60
40
20
1
10 100 1K 10K .1M 1M
FREQUENCY, F (Hz)
1.4
1.2
1.0
.8
.6
RL = 3.5K Ω
.4
250 300
30 50
100 150 200
TOTAL SUPPLY VOLTAGE, VS (V)
POWER SUPPLY REJECTION, PSR (dB)
COMMON MODE REJECTION, CMR (dB)
20
5K 10K 20K
200 500 1K 2K
EXT. COMPENSATION RESISTANCE, RC ( Ω)
140
70
1.6
NORMALIZED SLEW RATE (X)
OPEN LOOP GAIN, AOL (dB)
SLEW RATE (V/µS)
50
10 20 30 40 50 60
OUTPUT CURRENT, IO (mA)
POWER SUPPLY REJECTION
140
120
100
80
60
40
20
1
10 100 1K 10K .1M 1M
FREQUENCY, F (Hz)
pF
/50
70
TC
0
C
5°
=8
Ω
100
1.5
–
60
pF
00
/5
150
2.0
=
100
30
VS = ±150V
15
50K
.1M
.2M .3M .5M .7M 1M
FREQUENCY, F (Hz)
SLEW RATE VS. SUPPLY
SLEW RATE VS. COMP
200
TC
150
RC /
C
C =
/C
2
C =
0K
10 100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
2.5
25
=
°C
C
F
1
TC
3.0
°C
25
R
0n
–20
200
/1
RL = 3.5K Ω
0
4.5
POWER RESPONSE
0Ω
20
–8
300
3.5
TC = –25°C
–6
20
40
–4
5.0
4.0
TC = 25°C
–2
Ω
60
RL = 3.5KΩ
0
2K
80
TC = 85°C
2
=
/C C
RC
pF
50
Ω/
0K
=2
F
0p nF
/C C
/50 /10
RC
KΩ 0Ω
=2
20
=
/C C
RC
/C C
RC
100
OUTPUT VOLTAGE SWING
VOLTAGE DROP SUPPLY, VS–VO(V)
SMALL SIGNAL RESPONSE
120
OPEN LOOP GAIN
4
0
50 100 150 200 250 300
TOTAL SUPPLY VOLTAGE, VS (V)
OUTPUT VOLTAGE, VO (VPP )
15
60
INPUT NOISE
INPUT NOISE VOLTAGE, VN (nV/ √ Hz)
20
COMMON MODE VOLTAGE, VCM (VPP)
INTERNAL POWER DISSIPATION, P(W)
POWER DERATING
30
RELATIVE OPEN LOOP GAIN, A(dB)
PA84 • PA84A • PA84S
20
15
10
7
5
3
2
10
300
100
1K
10K
FREQUENCY, F (Hz)
.1M
COMMON MODE VOLTAGE
200
150
100
50
30
VS = ±150V
15
10K 20K 50K .1M .2M
.5M 1M
FREQUENCY, F (Hz)
APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
OPERATING
CONSIDERATIONS
PA84 • PA84A • PA84S
GENERAL
Please read the “General Operating Considerations” section, which covers stability, supplies, heatsinking, mounting,
current limit, SOA interpretation, and specification interpretation. Additional information can be found in the application
notes. For information on the package outline, heatsinks, and
mounting hardware, consult the “Accessory and Package
Mechanical Data” section of the handbook.
SAFE OPERATING AREA (SOA)
The bipolar output stage of this high voltage operational
amplifier has two output limitations:
OUTPUT CURRENT FROM +VS OR –VS (mA)
1. The internal current limit which limits maximum available
output current.
2. The second breakdown effect, which occurs whenever the
simultaneous collector current and collector-emitter voltage
exceeds specified limits.
50
ST
t=
EA
D
Y
40
t=
5m
FIGURE 1. PROTECTIVE,
INDUCTIVE LOAD
+VS
1m
s
s
ST
Be sure the diode voltage rating is greater than the total of both
supplies. The diode will turn on to divert the flyback energy into
the supply rails thus protecting the output transistors from
destruction due to reverse bias.
A note of caution about the supply. The energy of the flyback
pulse must be absorbed by the power supply. As a result, a
transient will be superimposed on the supply voltage, the
magnitude of the transient being a function of its transient
impedance and current sinking capability. If the supply voltage
plus transient exceeds the maximum supply rating or if the AC
impedance of the supply is unknown, it is best to clamp the
output and the supply with a zener diode to absorb the
transient.
AT
E
35
–VS
30
STABILITY
Due to its large bandwidth the PA84 is more likely to oscillate
than lower bandwidth Power Operational Amplifiers such as
the PA83 or PA08. To prevent oscillations, a reasonable phase
margin must be maintained by:
25
SAFE OPERATING AREA CURVES
20
150
170
200
250
300
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE (V)
The SOA curves combine the effect of these limits. For a
given application, the direction and magnitude of the output
current should be calculated or measured and checked against
the SOA curves. This is simple for resistive loads but more
complex for reactive and EMF generating loads. However, the
following guidelines may save extensive analytical efforts:
1. The following capacitive and inductive loads are safe:
±VS
C(MAX)
L(MAX)
150V
1.2µF
.7H
125V
6.0µF
25H
100V
12µF
90H
75V
ALL
ALL
2. Short circuits to ground are safe with dual supplies up to
±150V or single supplies up to 150V.
3. Short circuits to the supply rails are safe with total supply
voltages up to 150V (i.e. ±75V).
1. Selection of the proper phase compensation capacitor and
resistor. Use the values given in the table under external
connections and interpolate if necessary. The phase margin can be increased by using a large capacitor and a
smaller resistor than the slew rate optimized values listed in
the table. The compensation capacitor may be connected to
common (in lieu of +VS) if the positive supply is properly
bypassed to common. Because the voltage at pin 8 is only
a few volts below the positive supply, this ground connection requires the use of a high voltage capacitor.
2. Keeping the external sumpoint stray capacitance to ground
at a minimum and the sumpoint load resistance (input and
feedback resistors in parallel) below 500Ω. Larger sumpoint
load resistance can be used with increased phase compensation (see 1 above).
3. Connecting the amplifier case to a local AC common thus
preventing it from acting as an antenna.
OUTPUT PROTECTION
Two external diodes as shown in Figure 2, are required to
protect these amplifiers against flyback (kickback) pulses
exceeding the supply voltages of the amplifier when driving
inductive loads. For component selection, these external
diodes must be very quick, such as ultra fast recovery diodes
with no more than 200 nanoseconds of reverse recovery time.
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.
PA84U REV. L JANUARY 2000 © 2000 Apex Microtechnology Corp.