CIRRUS PA08A

PA08PA08
• PA08A
• PA08A
PPA08,
r o d u c t IPA08A
Innnnoovvaa t i o n F Fr ro omm
Power Operational Amplifier
FEATURES
• WIDE SUPPLY RANGE — ±15V to ±150V
• PROGRAMMABLE OUTPUT CURRENT LIMIT
• HIGH OUTPUT CURRENT — Up to ±150mA
• LOW BIAS CURRENT — FET Input
APPLICATIONS
• HIGH VOLTAGE INSTRUMENTATION
• ELECTROSTATIC TRANSDUCERS & DEFLECTION
• PROGRAMMABLE POWER SUPPLIES UP TO 290V
• ANALOG SIMULATORS
8-pin TO-3
PACKAGE STYLE CE
TYPICAL APPLICATION
+132V
DESCRIPTION
110KΩ
The PA08 is a high voltage operational amplifier designed
for output voltage swings of up to ±145V with a dual (±) supply or 290V with a single supply. 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 PA08 features an unprecedented supply range and excellent supply rejection. The output stage is
biased-on for linear operation. Internal phase compensation
assures stability at all gain settings. The safe operating area
(SOA) can be observed with all types of loads by choosing
the appropriate current limiting resistors. For operation into
inductive loads, two external flyback pulse protection diodes
are recommended. A heatsink may be necessary to maintain
the proper case temperature under normal operating conditions.
This hybrid integrated circuit utilizes 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 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”.
The PA08 as a pin driver is capable of supplying high test
voltages to a device under test (DUT). Due to the possibility
of short circuits to any terminal of the DUT, current limit must
be set to be safe when limiting with a supply to output voltage differential equal to the amplifier supply plus the largest
magnitude voltage applied to any other pin of the DUT. In
addition, flyback diodes are recommended when the output of
the amplifier exits any equipment enclosure to prevent damage
due to electrostatic discharges. Refer to Application Note 7
for details on accuracy considerations of this circuit.
EQUIVALENT SCHEMATIC
EXTERNAL CONNECTIONS
+132V
DAC
±1mA
8.2Ω
Q1
Q2
ATE PIN DRIVER
C3
Q5
RT
Q3
Q4
5
4
Q11
–IN
OUTPUT
4
Q12B
Q17
5
–VS
Q19
8
Q12A
OUT
1
8
CL–
RS
1
Q10
2
TOP VIEW
Q7
C2
C4
+IN
R CL+
CL+
Q6
2
Q9
Q8
-VS
-132V
3
C1
D.U.T.
-132V
+VS
D1
8.2Ω
PA08
3
7
+VS
6
7
BAL
R CL–
RS = ( +VS + -VS ) RT /1.6
NOTE: Input offset voltage trim optional. RT = 10KΩ MAX
Q16
Q15
D2
6
PA08U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 20091
APEX − PA08UREVM
PA08 • PA08A
ABSOLUTE MAXIMUM RATINGS
P r o d u c t I n n o v a t i o nF r o m
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal at TC = 25°C
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s max
TEMPERATURE, junction1
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
SPECIFICATIONS
PARAMETER
TEST CONDITIONS 2
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
TC = 25°C
TC = –25°C to +85°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = 25°C
TC = –25°C to +85°C
TC = –25°C to +85°C, VCM = ±90V
GAIN
OPEN LOOP GAIN at 10Hz
OPEN LOOP GAIN at 10Hz
GAIN BANDWIDTH PRODUCT at 1MHz
POWER BANDWIDTH
PHASE MARGIN
TC = 25°C, RL = ∞
TC = 25°C, RL = 1.2KΩ
TC = 25°C, RL = 1.2KΩ
TC = 25°C, RL = 1.2KΩ
TC = –25 to +85°C
OUTPUT
VOLTAGE SWING4
VOLTAGE SWING4
VOLTAGE SWING4
CURRENT, peak
SLEW RATE
CAPACITIVE LOAD, AV = 1
CAPACITIVE LOAD, AV > 4
SETTLING TIME to .1%
TC = 25°C, IO = 150mA
TC = –25o C to +85oC, IO = ±75mA
TC = –25o C to +85oC, IO = ±20mA
TC = 85°C
TC = 25°C
TC = –25 to +85°C
TC = –25 to +85°C
TC = 25°C, RL= 1.2KΩ, 2V step
POWER SUPPLY
VOLTAGE
CURRENT, quiescent
TC = –55 to +125°C
TC = 25°C
THERMAL
RESISTANCE, AC junction to case5
RESISTANCE, DC junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
TC = –55 to +125°C, F > 60Hz
TC = –55 to +125°C, F < 60Hz
TC = –55 to +125°C
Meets full range specification
MIN
±VS–10
96
PA08
TYP
PA08A
MAX MIN TYP
±.5
±15
±.5
±75
5
.01
±2.5
105
4
±2
±.25
±.5
±30
±5
±10
*
2
*
50
3
10
*
±50
±1.5
±10
*
*
*
*
130
118
111
5
90
60
–25
UNITS
mV
µV/°C
µV/V
µV/√kh
pA
pA/V pA
MΩ
pF
V
dB
dB
dB
MHz
kHz
°
*
*
*
*
*
*
*
20
*
10
*
SOA
*
*
V
V
V
mA
V/µs
nF
±100
6
±150
*
8.5
V
mA
4.26
6.22
30
*
8.57
*
*
*
85
*
*
1
*
MAX
*
*
*
*
*
±VS–15 ±VS–8
±VS–10 ±VS–5
±VS–5 ±VS–3
150
30
±15
300V
200mA
17.5W
±50V
±VS
300°C
175°C
–65 to +150°C
–55 to +125°C
*
*
*
*
µs
°C/W
°C/W
°C/W
°C
NOTES: * The specification of PA08A is identical to the specification for PA08 in applicable column to the left.
1. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve
high MTTF.
2. The power supply voltage specified under typical (TYP) applies unless otherwise noted.
3. Doubles for every 10oC of temperature increase.
4. +VS and –VS denote the positive and negative supply rail respectively.
5. Rating applies only if output current alternates between both output transistors at a rate faster than 60Hz.
CAUTION
2
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.
PA08U
PA08 • PA08A
10
7.5
5
25
50
75
100 125
TEMPERATURE, T (°C)
RCL = 10Ω
50
RL =1.2KΩ
PHASE, Ф (°)
–90
–120
–150
–180
0
1
10
100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
PULSE RESPONSE
6
2
0
–2
–4
VIN = ±5V, tr = 100ns
–6
0
1 1.5 2.0
.5
TIME, t (µs)
120
100
80
60
40
20
PA08U
10
100
1K 10K .1M
FREQUENCY, F (Hz)
10
1M
TC = -2
5°C
0
–2
–4
–6
300
100 150 200 250
30 50
TOTAL SUPPLY VOLTAGE, VS (V)
RL =1.2KΩ
1.2
1.0
.8
.6
120
100
80
+VS
60
40
–VS
20
1
10
100 1K 10K .1M
FREQUENCY, F (Hz)
1M
60
|+VS| + |–VS| = 100V
30
15
50K
POWER SUPPLY REJECTION
140
|+VS| + |–VS| = 300V
100
SLEW RATE
1.4
0
T = C = -25
C
°C
85°
C
2
200
100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
.4
100
150 200 250
300
30 50
TOTAL SUPPLY VOLTAGE, VS (V)
2.5
COMMON MODE REJECTION
1
0
1.6
4
140
–210
NORMALIZED SLEW RATE (X)
OPEN LOOP GAIN, AOL (dB)
20
T
POWER RESPONSE
–60
40
RL =1.2KΩ
4
300
–30
60
0
-25 0
25 50 75 100 125
CASE TEMPERATURE, TC (°C)
OPEN LOOP GAIN
6
PHASE RESPONSE
0
80
-20
OUTPUT VOLTAGE, VO (V)
0
-55
150
RL =1.2KΩ
100
COMMON MODE REJECTION CMR (dB)
100
SMALL SIGNAL RESPONSE
120
RCL = 4.7Ω
150
2.5
0
RELATIVE OPEN LOOP GAIN, A (dB)
12.5
200
OUTPUT VOLTAGE, VO (VP-P)
15
INPUT NOISE VOLTAGE, VN (nV/√Hz)
CURRENT LIMIT, ILIM (mA)
17.5
0
CURRENT LIMIT
250
COMMON MODE VOLTAGE, VCM (VP-P)
POWER DERATING
20
POWER SUPPLY REJECTION, PSR (dB)
INTERNAL POWER DISSIPATION, PD (W)
P r o d u c t I n n o v a t i o nF r o m
.2M .3M .5M .7M 1M
.1M
FREQUENCY, F (Hz)
INPUT NOISE
20
15
10
6
4
2
10
300
100
10K
1K
FREQUENCY, F (Hz)
.1M
COMMON MODE VOLTAGE
|+VS| + |–VS| = 300V
200
100
60
30
|+VS| + |–VS| = 100V
15
10K 20K
50K .1M .2M .5M
FREQUENCY, F (Hz)
1M
3
PA08 • PA08A
P r o d u c t I n n o v a t i o nF r o m
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.Cirrus.com for design tools that help automate tasks
such as calculations for stability, internal power dissipation, current limit and heat sink selection. The "Application Notes" and
"Technical Seminar" sections contain a wealth of information
on specific types of applications. Package outlines, heat sinks,
mounting hardware and other accessories are located in the
"Packages and Accessories" section. Evaluation Kits are available for most Apex Precision Power product models, consult
the "Evaluation Kit" section for details. For the most current
version of all Apex Precision Power product data sheets, visit
www.Cirrus.com.
SAFE OPERATING AREA (SOA)
OUTPUT CURRENT FROM
+VS OR –VS (mA)
200
t=
150
t=
100
80
t=
ste
ad
50
40
1m
t=
s
5m
20
0s
0.5
ms
s
ys
tat
e
±VS
SHORT TO ±VSC,
C, L, OR EMF LOAD
SHORT TO
COMMON
150V
125V
100V
75V
50V
20mA
27mA
42mA
67mA
130mA
67mA
90mA
130mA
200mA
200mA
These simplified limits may be exceeded with further analysis
using the operating conditions for a specific application.
3. The output stage is protected against transient flyback.
However, for protection against sustained, high energy
flyback, external fast-recovery diodes should be used.
INDUCTIVE LOADS
Two external diodes as shown in Figure 1, are required
to protect these amplifiers from 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. 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.
Fig. 1
30
IN4936 OR
UES1106
20
80
100
120
150 170
250
300
200
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE (V)
The output stage of most power amplifiers has two distinct
limitations:
1. The current handling capability of the transistor geometry
and the wire bonds.
2. The second breakdown effect which occurs whenever the
simultaneous collector current and collector-emitter voltage
exceeds specified limits.
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. Under transient conditions, the following capacitive and
inductive loads are safe with the current limits set to the
maximum:
±VS
C(MAX)
L(MAX)
150V
125V
100V
75V
50V
.4µF
.9µF
2µF
10µF
100µF
280mH
380mH
500mH
1200mH
13H
2. The amplifier can handle any EMF generating or reactive
load and short circuits to the supply rails or simple shorts
to common if the current limits are set as follows:
4
100pf/200V
Fig. 2
+VS
+IN
150KΩ
Q1
Q3
Q2
–IN
–VS
_
Q4
150KΩ
+
100pf/200V
PROTECTION, INDUCTIVE LOAD
PROTECTION, OVERVOLTAGE
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.
INPUT PROTECTION
The input is protected against common mode voltages up to
the supply rails and differential voltages up to ±50V. Increased
protection against differential input voltages can be obtained by
adding 2 resistors, 2 capacitors and 4 diode connected FETs
as shown in Figure 2.
CURRENT LIMITING
Proper operation requires the use of two current limit resistors, connected as shown in the external connection diagram.
The minimum value for RCL is 3.24Ω. However, for optimum
reliability it should be set as high as possible. Refer to the
“General Operating Considerations” section of the handbook
for current limit adjust details.
PA08U
P r o d u c t I n n o v a t i o nF r o m
PA08 • PA08A
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
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
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PA08U
5