CIRRUS PA85A

PA85PA85
• PA85A
• PA85A
PPA85,
r o d u c t IPA85A
Innnnoovvaa t i o n FFr roomm
High Voltage Power Operational Amplifiers
FEATURES
• HIGH VOLTAGE — 450V (±225V)
• HIGH SLEW RATE — 1000V/μs
• HIGH OUTPUT CURRENT — 200mA
APPLICATIONS
PATENTED
• HIGH VOLTAGE INSTRUMENTATION
• PIEZO TRANSDUCER EXCITATION
• PROGRAMMABLE POWER SUPPLIES UP TO 430V
• ELECTROSTATIC TRANSDUCERS & DEFLECTION
TYPICAL APPLICATION
Dynamic focusing is the active correction of focusing voltage
as a beam traverses the face of a CRT. This is necessary in
high resolution flat face monitors since the distance between
cathode and screen varies as the beam moves from the center
of the screen to the edges. PA85 lends itself well to this function
since it can be connected as a summing amplifier with inputs
from the nominal focus potential and the dynamic correction.
The nominal might be derived from a potentiometer, or perhaps automatic focusing circuitry might be used to generate
this potential. The dynamic correction is generated from the
sweep voltages by calculating the distance of the beam from
the center of the display.
DESCRIPTION
The PA85 is a high voltage, high power bandwidth MOSFET
operational amplifier designed for output currents up to 200mA.
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
PA85 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 thick film (cermet) resistors, ceramic
capacitors and silicon 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
isolation washers voids the warranty.
RIN1
DC
FOCUS
RF
+225V
X SWEEP
SAMPLE
z=
Q4
3
+VS
D23
COMP
7
8
–IN
5
Q6
Q10A
Q7
Q10B
+IN
4
EXTERNAL CONNECTIONS
Q9
Q8
CL
Q11
1
OUT
Q16
PA85U
http://www.cirrus.com
–VS
6
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
RCL
CL
3
2
1 OUT
+IN 4
TOP VIEW
–IN
5
8
–Vs
Q18
D2
+Vs
2
Q12
Q17
Q13
TO
FOCUS
GRID
PA85
Y SWEEP
SAMPLE
-225V
D1
Q2
RCL
RIN2
x2+y2
EQUIVALENT SCHEMATIC
Q1
8-pin TO-3
PACKAGE STYLE CE
6
COMP
CC
7
COMP
RC
PHASE COMPENSATION
RC
Gain
CC
1
68pF
100Ω
20
10pF
330Ω
100
3.3pF
0Ω
CC RATED FOR FULL
SUPPLY VOLTAGE
MAY 20091
APEX − PA85UREVO
PA85 • PA85A
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER
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, continuous within SOA
POWER DISSIPATION, continuous @ TC = 25°C2
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder - 10s max
TEMPERATURE, junction2
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
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
Full temperature range
VCM = ±90V
100kHz BW, RS = 1KΩ, CC = 10pf
GAIN
OPEN LOOP, @ 15Hz
RL = 2KΩ, CC = OPEN
GAIN BANDWIDTH PRODUCT at 1MHz RL = 2KΩ, CC = 3.3pf
POWER BANDWIDTH
CC = 10pf
CC = 3.3pf
PHASE MARGIN
Full temperature range
OUTPUT
VOLTAGE SWING4
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
POWER SUPPLY
VOLTAGE6
CURRENT, quiescent
THERMAL
RESISTANCE, AC, junction to case5
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
MIN
IO = ±200mA
IO = ±75mA
IO = ±20mA
TC = 85°C
CC = 10pf
CC = OPEN
Full temperature range
CC = 10pf, 2V step
RCL = 0
Full temperature range
Full temperature range, F > 60Hz
Full temperature range, F < 60Hz
Full temperature range
Meets full range specifications
±VS–15
90
96
PA85
TYP
.5
10
3
75
5
.01
10
1011
4
110
1
111
100
300
500
60
±Vs–10 ±Vs–6.5
±V–8.5 ±Vs–6.0
±V–8.0 ±Vs–5.5
±200
400
1000
470
1
50
±15
–25
±150
21
30
450V
200mA
30W
±25V
±VS
300°C
150°C
–65 to +150°C
–55 to +125°C
PA85A
MAX
MIN TYP
MAX
2
.25
.5
30
5
10
10
*
*
*
50
3
10
*
100
3
30
*
*
*
*
*
*
*
UNITS
mV
µV/°C
µV/V
µV/√kh
pA
pA/V
pA
Ω
pF
V
dB
µVrms
*
*
*
*
*
dB
MHz
kHz
kHz
°
*
*
*
*
*
*
*
*
700
*
*
*
*
*
V
V
V
mA
V/µs
V/µs
pf
µs
Ω
±225
*
25
*
*
*
*
2.5
*
4.2
*
*
+85
*
*
V
mA
°C/W
°C/W
°C/W
°C
NOTES: * The specification of PA85A is identical to the specification for PA85 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. Ratings apply only to output transistors. An additional 10W may be dissipated due to quiescent power.
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 PA85 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.
PA85U
PA85 • PA85A
PHASE RESPONSE
0
–45
16
8
–135
–180
–225
C
5°
5
0
DISTORTION, (%)
COMMON MODE REJECTION
CC = 10pF
120
100
80
60
40
20
1K
PA85U
10K
100K
1M
FREQUENCY, F (Hz)
10M
POWER SUPPLY REJECTION, PSR (dB)
COMMON MODE REJECTION, CMR (dB)
140
50
RL = 2KΩ
250
HARMONIC DISTORTION
AV = 30
PO = 15W
CC = 10pf
RL = 1KΩ
.01
.005
.003
.001
10
15
45
90
0
60
30
75
EXT. COMPENSATION CAPACITOR, CC (pF)
75
25
50K 100K 200K 500K 1M 2M
FREQUENCY, F (Hz)
100
1K
10K
FREQUENCY, F (Hz)
100K
15
10
7
5
3
2
10
POWER SUPPLY REJECTION
120
300
80
60
40
20
1
10
100 1K 10K .1M
FREQUENCY, F (Hz)
1M
1K
100
10K
FREQUENCY, F (Hz)
100K
CURRENT LIMIT
500
100
5M
INPUT NOISE VOLTAGE
20
140
CURRENT LIMIT, ILIM (mA)
SLEW RATE, (V/μS)
100
200
100
OUTPUT CURRENT, IO (mA)
f
55°C
TC = –
125
100
f
TC
6
C
= 25°
250
.3p
7
.03
200
POWER RESPONSE
=3
8
.05
500
100
300
400 450
200
TOTAL SUPPLY VOLTAGE, VS (V)
0p
SLEW RATE
1000
0
=1
1K 10K .1M 1M 10M 20M
FREQUENCY, F (Hz)
.90
CC
100
.95
500
9
4
TC = –55°C
f
–20
10
1.00
T C = 25°C
8p
CC = 68pF
0
1.05
°C
125
=6
20
TC =
CC
CC = 10pF
40
1.10
OUTPUT VOLTAGE SWING
10
12
80
40M
1.15
CC
CC = 3.3pF
1M
10M
FREQUENCY F (Hz)
=
100
60
–270
.2M
25
50
75 100 125 150
CASE TEMPERATURE, TC (°C)
SMALL SIGNAL RESPONSE
CC = 3.3pF
C
0
120
OPEN LOOP GAIN, A (dB)
CC = 10pF
T
0
CC = 68pF
–90
OUTPUT VOLTAGE, VO (VPP)
24
QUIESCENT CURRENT
1.20
INPUT NOISE VOLTAGE, VN (nV/ √Hz)
PHASE, Ф (°)
32
NORMALIZED QUIESCENT CURRENT, IQ (X)
POWER DERATING
40
VOLTAGE DROP FROM SUPPLY, VS – VO (V)
OUTPUT STAGE
INTERNAL POWER DISSIPATION, P(W)
P r o d u c t I n n o v a t i o nF r o m
200
100
50
20
1
2
20 30
5
10
RESISTOR VALUE, RCL (Ω)
3
PA85 • PA85A
P r o d u c t I n n o v a t i o nF r o m
GENERAL
SAFE OPERATING CURVES
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.
The safe operating area curves define the maximum additional internal power dissipation the amplifier can tolerate
when it produces the necessary output to drive an external
load. This is not the same as the absolute maximum internal
power dissipation listed elsewhere in the specification since the
quiescent power dissipation is significant compared to the total.
CURRENT LIMIT
For proper operation, the current limit resistor (RCL) must be
connected as shown in the external connection diagram. The
minimum value is 1.4 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
30 ohms.
.7 RCL = ILIM - .016
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.
NOTE: The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
SOA
OUTPUT CURRENT FROM +VS OR –VS, (mA)
500
20
300
0m
,T
50
,T
C
STABILITY
The PA85 is externally compensated and performance can
be tailored to the application. Use the graphs of small signal
response and power response as a guide. The compensation
capacitor CC must be rated at 500V working voltage. An NPO
capacitor is recommended. The compensation network CCRC
must be mounted closely to the amplifier pins 7 and 8 to avoid
spurious oscillation.
=
+VS
=
Z1
25
°C
85
=
12
5°
C
5
–IN
Q1
°C
DC
3
Q3
PA85
+IN
Q2
Q4
4
6
30
Z2
20
10
25
4
C
C
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 reversals 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.
S
DC
,T
POWER SUPPLY PROTECTION
0m
DC
100
Although the PA85 can withstand differential voltages up to
±25V, additional external protection is recommended. Since
the PA85 is a high speed amplifier, low leakage, low capacitance JFETs connected as diodes are recommended (e.g.
2N4416, Q1-Q4 in Figure 2). The differential input voltage will
be clamped to ±1.4V. This is sufficient overdrive to produce
maximum power bandwidth.
10
S
200
INPUT PROTECTION
–VS
FIGURE 2.
OVERVOLTAGE PROTECTION
PULSE CURVES @ 10% DUTY CYCLE MAX
50
75 100 125
250
500
SUPPLY TO OUTPUT DIFFERENTIAL, VS –VO (V)
PA85U
P r o d u c t I n n o v a t i o nF r o m
PA85 • PA85A
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
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus
for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third
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copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent
does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
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PA85U
5