CIRRUS PA88A

PA88PA88
• PA88A
• PA88A
P r o d u c t IPA88A
Innnnoovvaa t i o n FFr roomm
PA88,
High Voltage Power Operational Amplifiers
FEATURES
• HIGH VOLTAGE — 450V (±225V)
• LOW QUIESCENT CURRENT — 2mA
• HIGH OUTPUT CURRENT — 100mA
• PROGRAMMABLE CURRENT LIMIT
• LOW BIAS CURRENT — FET Input
PATENTED
APPLICATIONS
• PIEZOELECTRIC POSITIONING
• HIGH VOLTAGE INSTRUMENTATION
• ELECTROSTATIC TRANSDUCERS
• PROGRAMMABLE POWER SUPPLIES UP TO 440V
TYPICAL APPLICATION
RF
DESCRIPTION
+V S
The PA88 is a high voltage, low quiescent current MOSFET
operational amplifier designed for output currents up to 100mA.
Output voltages can swing up to ±215V with a dual supply
and up to +440 volts with a single supply. The safe operating
area (SOA) has no second breakdown limitations and can be
observed with all types of loads by choosing an appropriate current limiting resistor. High accuracy is achieved with a cascode
input circuit configuration. All internal biasing is referenced to a
bootstrapped zener-MOSFET current source. As a result, the
PA88 features an unprecedented supply range and excellent
supply rejection. The MOSFET output stage is biased on for
linear operation. External compensation provides user flexibility.
This hybrid circuit utilizes beryllia (BeO) substrates, 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 8-pin 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”.
PIEZO DRIVE
D1
Q2
Q4
D19
COMP
7
8
– IN
5
Q6
Q10A
Q7
+ IN
4
Q8
COMPUTER
FOCUS
COMMAND
VOLTAGE
–V S
LOW POWER, PIEZOELECTRIC POSITIONING
Piezo positioning may be applied to the focusing of
segmented mirror systems. The composite mirror may be
composed of hundreds of elements, each requiring focusing
under computer control. In such complex systems the PA88’s
advantage of low quiescent power consumption reduces
the costs of power supplies and cooling, while providing the
interface between the computer and the high voltage drive to
the piezo positioners.
EXTERNAL CONNECTIONS
Q12
Q11
2
PHASE COMPENSATION
1 OUT
TOP VIEW
1
OUT
Q10B
R CL
CL
3
+IN 4
Q9
CL
2
V OUT
PA88
+Vs
3
+VS
CC
R IN
EQUIVALENT SCHEMATIC
Q1
8-pin TO-3
PACKAGE STYLE CE
–IN
5
8
–Vs
6
GAIN
CC
1
10
20
100
68pf
33pf
15pf
3.3pf
COMP
CC
7
COMP
RC
RC
100W
100W
100W
—
RCL = .7
ILIM
CC RATED FOR FULL
SUPPLY VOLTAGE
Q17
Q18
Q13
Q16
D2
PA88U
http://www.cirrus.com
–VS
6
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 20091
APEX − PA88UREVN
PA88 • PA88A
P r o d u c t I n n o v a t i o nF r o m
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, source, sink
POWER DISSIPATION, continuous @ TC = 25°C
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s max
TEMPERATURE, junction2
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
SPECIFICATIONS
PARAMETER
TEST CONDITIONS 1
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. time
BIAS CURRENT, initial3
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial3
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE4
COMMON MODE REJECTION, DC
NOISE
VCM = ±90V
100kHz BW, RS = 1KΩ, CC = 15pf
GAIN
OPEN LOOP, @ 15Hz
GAIN BANDWIDTH PRODUCT at 1MHz
POWER BANDWIDTH
PHASE MARGIN
RL = 2KΩ, CC = OPEN
RL = 2KΩ, CC = 15pf, RC = 100Ω
RL = 2KΩ, CC = 15pf, RC = 100Ω
Full temperature range
OUTPUT
VOLTAGE SWING4
VOLTAGE SWING4
CURRENT, continuous
SLEW RATE, AV = 20
SLEW RATE, AV = 100
CAPACITIVE LOAD, AV = +1
SETTLING TIME to .1%
RESISTANCE, no load
Full temp. range, IO = ±75mA
Full temp. range, IO = ±20mA
TC = 85°C
CC = 15pf, RC = 100Ω
CC = OPEN
Full temperature range
CC = 15pf, RC = 100Ω, 2V step
RCL = 0
POWER SUPPLY
VOLTAGE6
CURRENT, quiescent,
THERMAL
RESISTANCE, AC, junction to case5
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
MIN
Full temperature range
See note 6
Full temperature range, F > 60Hz
Full temperature range, F < 60Hz
Full temperature range
Meets full range specifications
±VS–15
90
96
PA88
TYP
.5
10
1
75
5
.01
2.5
1011
4
110
2
111
2.1
6
60
±VS–16 ±VS–14
±VS–10 ±VS–5.2
±100
8
30
470
10
100
±15
–25
±200
1.7
30
450V
See SOA
15W
±25V
±VS
300°C
150°C
–65 to +150°C
–55 to +125°C
PA88A
MAX
MIN TYP
MAX
2
.25
.5
30
5
10
5
*
*
*
50
3
10
*
100
3
20
*
*
*
*
*
*
*
UNITS
mV
µV/°C
µV/V
µV/√kh
pA
pA/V
pA
Ω
pF
V
dB
µVrms
*
*
*
*
dB
MHz
kHz
°
*
*
*
*
*
*
*
*
*
*
V
V
mA
V/µs
V/µs
pf
µs
Ω
±225
*
2
*
*
*
*
5.0
*
8.3
*
*
+85
*
*
V
mA
°C/W
°C/W
°C/W
°C
NOTES: * The specification of PA88A is identical to the specification for PA88 in applicable column to the left.
1. Unless otherwise noted: TC = 25°C, compensation = CC = 68pF, RC = 100Ω. DC input specifications are ± value given. Power
supply voltage is typical rating.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to
achieve high MTTF.
3. Doubles for every 10°C of temperature increase.
4. +VS and –VS denote the positive and negative power supply rail respectively.
5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
6. Derate max supply rating .625 V/°C below 25°C case. No derating needed above 25°C case.
CAUTION
2
The PA88 is constructed from MOSFET transistors. ESD handling procedures must be observed.
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.
PA88U
PA88 • PA88A
P r o d u c t I n n o v a t i o nF r o m
POWER DERATING
PHASE RESPONSE
T = TC
2.5
CC = 33pF
–90
CC = 68pF
–120
–150
CC = 33pF
–180
0
0
25
50
75 100 125
TEMPERATURE, T (°C)
150
–210
OUTPUT VOLTAGE SWING
20
2
20
1
.0001
COMMON MODE REJECTION
120
100
80
60
40
20
1
PA88U
10
100 1K 10K .1M
FREQUENCY, F (Hz)
1M
25
1K
30
300
3K
FREQUENCY, F (Hz)
3
30K
15
10
7
5
3
2
10
POWER SUPPLY REJECTION
120
120
100
80
60
40
20
1
10
100 1K 10K .1M
FREQUENCY, F (Hz)
1M
100
1K
10K
FREQUENCY, F (Hz)
1M
CURRENT LIMIT
200
100
2K 3K 5K 10K 20K
50K 100K
FREQUENCY, F (Hz)
INPUT NOISE
20
140
CURRENT LIMIT, ILIM (mA)
DISTORTION, (%)
.01
.001
0 10 20 30 40 50 60 70
COMPENSATION CAPACITOR, CC (pF)
COMMON MODE REJECTION, CMR (dB)
.1
2
POWER SUPPLY REJECTION, PSR (dB)
SLEW RATE, (V/μS)
3
50
100
RL = 2KΩ
PO = 2.5W
AV = 30
1
5
40
60
80
OUTPUT CURRENT, IO (mA)
75
HARMONIC DISTORTION
30
10
TC=-55°C
TC=25°C
f
4
.3p
6
=3
8
125
100
f
10
f
TC=85°C
12
250
5p
14
CC
TC=125°C
10
20
POWER RESPONSE
500
Positive
18 Negative
16
100
300
200
450
TOTAL SUPPLY VOLTAGE, VS (V)
=1
SLEW RATE
50
0
CC
100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
1.0
100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
f
10
1.25
3p
1
1.5
8p
0
°C
T C = 25
°C
5
T C = -5
1.75
=3
CC = 68pF
20
10
2.0
=6
CC = 33pF
40
1
25°C
TC = 1
CC
CC = 15pF
60
CC = 3.3pF
2.25
CC
CC = 3.3pF
80
VOLTAGE DROP FROM SUPPLY, Vs-Vo, (V)
SMALL SIGNAL RESPONSE
100
CC = 68pF
OUTPUT VOLTAGE, VO (VPP)
T = TA
120
OPEN LOOP GAIN, A (dB)
PHASE, Ф (°)
7.5
5
CC = 3.3pF
–60
10
–20
QUIESCENT CURRENT, IQ (mA)
–30
12.5
QUIESCENT CURRENT
2.5
0
INPUT NOISE VOLTAGE, VN (nV/√Hz)
INTERNAL POWER DISSIPATION, P (W)
15
70
50
30
20
10
5
50
3
10
20
100 150
CURRENT LIMIT RESISTOR, RCL (Ω)
3
PA88 • PA88A
P r o d u c t I n n o v a t i o nF r o m
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.Cirrus.com for design tools that help
automate tasks such as calculations for stability, internal power
dissipation, current limit; heat sink selection; Apex Precision
Power’s complete Application Notes library; Technical Seminar
Workbook; and Evaluation Kits.
Although the PA88 can withstand differential input voltages
up to ±25V, additional external protection is recommended,
and required at total supply voltages above 300 volts. In most
applications 1N4148 or 1N914 signal diodes are sufficient (D1,
D2 in Figure 2a). In more demanding applications where low
leakage or low capacitance are of concern 2N4416 or 2N54572N5459 JFETs connected as diodes will be required (Q1, Q2
in Figure 2b). In either case the input differential voltage will
be clamped to ±.7V. This is sufficient overdrive to produce
maximum power bandwidth.
CURRENT LIMIT
For proper operation, the current limit resistor (RCL) must be
connected as shown in the external connection diagram. The
minimum value is 3.5 ohm, however for optimum reliability the
resistor value should be set as high as possible. The value
is calculated as follows; with the maximum practical value of
150 ohms.
.7 RCL = ILIM
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational amplifier has two distinct limitations:
1. The current handling capability of the MOSFET geometry
and the wire bonds.
2. The junction temperature of the output MOSFETs.
SOA
OUTPUT CURRENT FROM +VS OR –VS, (mA)
250
10
150
0m
100
,T
C
DC
50
,T
C
C
=
25
°C
85
°C
DC
,T
=
S
S
DC
25
0m
20
=
12
5°
C
15
10
5
25
PULSE CURVES @ 10% DUTY CYCLE MAX
50
75 100 125
250
500
SUPPLY TO OUTPUT DIFFERENTIAL, VS –VO (V)
NOTE: The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors are recommended as protection on the supply pins. The zeners clamp
transients to voltages within the power supply rating and also
clamp power supply reversals to ground. Whether the zeners
are used or not, the system power supply should be evaluated
for transient performance including power-on overshoot and
power-off polarity reversal as well as line regulation.
Conditions which can cause open circuits or polarity reversals
on either power supply rail should be avoided or protected
against. Reversals or opens on the negative supply rail is
known to induce input stage failure. Unidirectional transzorbs
prevent this, and it is desirable that they be both electrically
and physically as close to the amplifier as possible.
STABILITY
The PA88 has sufficient phase margin to be stable with
most capacitive loads at a gain of 4 or more, using the recommended phase
a.
+VS
compensation.
The PA88 is exterZ1
nally compensated
and performance can
3
5
be tailored to the –IN
application. Use the
D1
D2
PA88
graphs of small signal
+IN
response and power
4
6
response as a guide.
The compensation
Z2
capacitor C C must
be rated at 500V
–VS
working voltage. An b.
+VS
NPO capacitor is
Z1
recommended. The
compensation net3
work CCRC must be
5
–IN
mounted closely to
Q1
Q2
PA88
the amplifier pins 7
and 8 to avoid spuri- +IN
4
ous oscillation.
6
Z2
–VS
FIGURE 2. OVERVOLTAGE PROTECTION
4
PA88U
P r o d u c t I n n o v a t i o nF r o m
PA88 • PA88A
Contacting Cirrus Logic Support
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected]
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
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PA88U
5