CIRRUS PA91_10

®
PA91
PA91
ct Innovation From
P r o d uPA91
High Voltage Power Operational Amplifiers
FEATURES
DESCRIPTION
The PA91 is a high voltage, low quiescent current
MOSFET operational amplifier designed as a low cost
solution for driving continuous output currents up to
200mA and pulse currents up to 350mA. The safe operating area (SOA) has no second breakdown limitations
and can be observed for all type loads by choosing
an appropriate current limiting resistor. The MOSFET
output stage is biased AB for linear operation. External compensation provides flexibility in choosing bandwidth and slew rate for the application. Apex Precision
Power’s Power SIP package uses a minimum of board
space allowing for high density circuit boards. The 12pin PowerSIP package is electrically isolated.
♦ HIGH VOLTAGE — 450V (±225V)
♦ LOW QUIESCENT CURRENT — 10mA
♦ HIGH OUTPUT CURRENT — 200mA ♦ PROGRAMMABLE CURRENT LIMIT
♦ HIGH SLEW RATE — 300V/µs
APPLICATIONS
♦ PIEZOELECTRIC POSITIONING
♦ HIGH VOLTAGE INSTRUMENTATION
♦ ELECTROSTATIC TRANSDUCERS
♦ PROGRAMMABLE POWER SUPPLIES UP
TO 440V
EQUIVALENT SCHEMATIC
12
11
+VS
R1 R2
Q1
C1
Q3
Q2
Q6
4
CC1
Q5
Q14A
1
–IN
R3
R4
5
CC2
ILIM
9
Q8
Q14B
R7
R8
R9
Q12
6
OUT
Q13
3
IQ
2
+IN
R10
Q17
Q16
Q15
R11
–VS
7
10
Q11
R6
R5
Q4
R12
8
EXTERNAL CONNECTIONS
1
2
3
4
Rc
–IN
5
6
7
8
*
IQ
(See text.)
10
11
Cc
RCL
+IN
9
TO LOAD
AND FEEDBACK
12
*
–Vs
+Vs
12-pin SIP
PACKAGE
STYLE DP
Formed leads available
See package style EE
* Bypassing required.
PA91U
www.cirrus.com
Copyright © Cirrus Logic, Inc. 2010
(All Rights Reserved)
MAR 20101
APEX − PA91UREVI
®
PA91
Product Innovation From
1. CHARACTERISTICS AND SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Min
Max
Units
SUPPLY VOLTAGE, +VS to -VS
450
V
OUTPUT CURRENT, source, sink, peak, within SOA
350
mA
POWER DISSIPATION, continuous @ TC = 25°C
30
W
INPUT VOLTAGE, differential
-20
20
V
INPUT VOLTAGE, common mode
-VS
VS
V
260
°C
TEMPERATURE, pin solder, 10s max.
TEMPERATURE, junction (Note 2)
150
°C
TEMPERATURE RANGE, storage
−40
85
°C
OPERATING TEMPERATURE, case
−25
85
°C
CAUTION
The PA91 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The exposed substrate contains beryllia (BeO). Do not crush, machine, or subject to temperatures
in excess of 850°C to avoid generating toxic fumes.
SPECIFICATIONS
Parameter
Test Conditions1
Min
Typ
Max
Units
0.5
2
mV
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE vs. temperature
Full temperature range
15
50
µV/°C
OFFSET VOLTAGE vs. supply
10
25
µV/V
OFFSET VOLTAGE vs. time
75
BIAS CURRENT, initial
200
BIAS CURRENT vs. supply
µV/KHz
2000
4
OFFSET CURRENT, initial
50
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE
(Note 3)
VCM = ±90V
NOISE
100KHz bandwidth,
RS = 1KΩ, CC = OPEN
80
500
pA
1011
Ω
4
pF
±VS Ŧ 15
COMMON MODE REJECTION, DC
pA
pA/V
V
98
dB
1
µV RMS
GAIN
OPEN LOOP @ 15Hz
RL = 2KΩ, CC = OPEN
111
dB
GAIN BANDWIDTH PRODUCT @ 1MHz
RL = 2KΩ, CC = OPEN
94
100
MHz
POWER BANDWIDTH
RL = 2KΩ, CC = OPEN
470
KHz
PHASE MARGIN
Full temperature range
60
°
±VS Ŧ 10
V
300
V/µS
OUTPUT
VOLTAGE SWING (Note 3) IO = 200mA
CURRENT, continuous
±VS Ŧ 12
200
SLEW RATE, A V = 100
CC = OPEN
240
CAPACITIVE LOAD, A V = +1
Full temperature range
470
2
mA
pF
PA91U
®
PA91
Product Innovation From
Parameter
Test Conditions1
SETTLING TIME to 0.1%
Min
Typ
CC = OPEN, 2V step
RESISTANCE, no load
Max
Units
1
µS
50
Ω
POWER SUPPLY
VOLTAGE (Note 5)
±40
CURRENT, quiescent
±150
±225
V
10
14
mA
2.5
°C/W
4.2
°C/W
THERMAL
RESISTANCE, AC, junction to case (Note 4) Full temp range, F > 60Hz
RESISTANCE, DC, junction to case
Full temp range, F < 60Hz
RESISTANCE, junction to air
Full temp range
TEMPERATURE RANGE, case
Meets full range specifications
30
°C/W
-25
+85
°C
NOTES: 1. (All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical performance characteristics and specifications are derived from measurements taken
at typical supply voltages and TC = 25°C).
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate
power dissipation to achieve high MTTF.
3. +VS and –VS denote the positive and negative power supply rail respectively.
4. Rating applies if the output current alternates between both output transistors at a rate faster than
60Hz.
5. Derate max supply rating 0.625 V/°C below 25°C case. No derating needed above 25°C case.
POWER DERATING
32
OUTPUT STAGE
24
16
135
8
0
270
100k
25
50
75 100 125 150
CASE TEMPERATURE, TC (°C)
4
3.5
N, (%)
1
0
0.1
.05
0.15
OUTPUT CURRENT, IO (A)
100
90
80
70
60
50
10K
HARMONIC DISTORTION
RL = 1KΩ
VS = 200V
AV = 63
.1
0.2
200
20
15
10
N
OPE
F
4.7p
4.5
300
CC=
200
5
400
F
300
SLEW RATE
5.5
POWER RESPONSE
10p
1K
700
PA91U
500
500
50
100
75
125
CASE TEMPERATURE, TC (°C)
F
CC = 68 pF
0 CC = 10 pF
CC = 4.7 pF
–10 CC = OPEN
100K
1M
10M
FREQUENCY, F (Hz)
1.0
25
68p
10
1.1
CC=
20
OUTPUT VOLTAGE SWING
6
1.2
CC=
30
1M
10M
FREQUENCY F (Hz)
1.3
CC=
OPEN LOOP GAIN, A (dB)
40
VOLTAGE DROP FROM SUPPLY, VS – VO (V)
SMALL SIGNAL RESPONSE
50
(V/μS)
CC = 68 pF
CC = 10 pF
CC = 4.7 pF
CC = OPEN
OUTPUT VOLTAGE, VO(VP-P)
0
180
225
NORMALIZED QUIES. CURRENT
NORMALIZED QUIESCENT CURRENT, IQ (X)
PHASE RESPONSE
90
GE, V (nV√Hz)
40
PHASE, Ф (°)
INTERNAL POWER DISSIPATION, P(W)
TYPICAL PERFORMANCE GRAPHS
100K
1M
FREQUENCY, F (Hz)
INPUT NOISE VOLTAGE
3
DISTORTION, (%)
OUTPUT VOLTAG
HARMONIC DISTORTION
RL = 1KΩ
VS = 200V
AV = 63
.1
PO = 17.6W
.01
PO = 1W
PO = 5W
20
10
0.1
10
100
1
EXT. COMPENSATION CAPACITOR, CC (pF)
.001
10
100
1K
10K
FREQUENCY, F (Hz)
100K
100K
1M
FREQUENCY, F (Hz)
INPUT NOISE VOLTAGE
20
INPUT NOISE VOLTAGE, V (nV√Hz)
VOLTAGE DROP FROM SUP
OPEN LOOP GAIN
SLEW RATE, (V/μS)
100
70
50
40
30
0.2
F
4.7p
1
0.1
.05
0.15
OUTPUT CURRENT, IO (A)
PEN
200
Product Innovation From
0
CC=
300
3.5
100
90
80
70
60
50
10K
=O
SLEW RATE
1K
700
500
®
F
10p
PA91
4
CC=
CC = 68 pF
0 CC = 10 pF
CC = 4.7 pF
–10 CC = OPEN
100K
1M
10M
FREQUENCY, F (Hz)
4.5
200
F
68p
10
5
CC=
20
C
30
15
10
7
5
3
2
10
100
1K
10K
FREQUENCY, F (Hz)
100K
CURRENT LIMIT
CURRENT LIMIT, ILIM (A)
.2
PHASE COMPENSATION
GAIN
≥1
≥5
≥10
≥30
.15
.1
.05
0
CC*
68pF
10pF
4.7pF
NONE
RC
100Ω
100Ω
0Ω
0Ω
*CC To be rated for the full supply voltage +VS to –VS.
Use NPO ceramic (COG) type.
0
8
12
24
4
16 20
RESISTOR VALUE, RCL (Ω)
TYPICAL APPLICATION
RF
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
PA91 reduces the costs of power supplies and cooling
with its advantages of low cost and low quiescent power
consumption while increasing circuit density with the SIP
package.
GENERAL
+VS
R IN
1
11,12
PIEZO DRIVE
PA91
6
V OUT
2
COMPUTER
FOCUS
COMMAND
VOLTAGE
7,8
9,10
R CL
–V S
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.
CURRENT LIMIT
For proper operation, the current limit resistor (RCL) must be connected as shown in the external connection diagram. 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 32 ohms.
.65 RCL = ILIM 4
PA91U
®
PA91
Product Innovation From
SAFE OPERATING AREA (SOA)
SAFE OPERATING CURVES
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.
INPUT PROTECTION
OUTPUT CURRENT FROM +VS OR -VS (mA)
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
500
20
300
0m
10
S
0m
S
200
DC
,T
100
C
DC
,T
C
,T
C
25
°C
85
°C
DC
50
=
=
=
12
5°
30
C
20
PULSE CURVES @ 10% DUTY CYCLE MAX.
10
Although the PA91 can withstand differential voltages
25
75 100 125
250
500
50
up to ±20V, additional external protection is recomSUPPLY TO OUTPUT DIFFERENTIAL, VS - VO (V)
mended. Low leakage, low capacitance JFETs connected as diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure
+VS
2). The differential input voltage will be clamped to ±1.4V. This is
Z1
sufficient overdrive to produce maximum power bandwidth.
POWER SUPPLY PROTECTION
–IN
1
11, 12
Unidirectional zener diode transient suppressors are recommended
Q1
Q3
6
as protection on the supply pins. See Figure 2. The zeners clamp
PA91
transients to voltages within the power supply rating and also clamp
Q2
Q4
power supply reversals to ground. Whether the zeners are used or
+IN
7, 8
2
not, the system power supply should be evaluated for transient performance including power-on overshoot and power-off polarity reverZ2
FIGURE 2.
sals as well as line regulation.
OVERVOLTAGE
–VS
Conditions which can cause open circuits or polarity reversals on
PROTECTION
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 PA91 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 4 and 5 to avoid spurious oscillation.
QUIESCENT CURRENT REDUCTION
When pin 3 (IQ) is shorted to pin 5 (CC2) the AB biasing of the output stage is disabled. This raises distortion since
the output stage is then class C biased, but reduces the quiescent current by 1mA for a power dissipation savings
of 0.4W. Pin 3 may be left open if not used.
PA91U
5
PA91
®
Product Innovation From
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
SUITABLE FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF
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CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES,
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Cirrus Logic, Cirrus, and the Cirrus Logic logo designs, Apex Precision Power, Apex and the Apex Precision Power logo designs are trademarks of Cirrus Logic, Inc.
All other brand and product names in this document may be trademarks or service marks of their respective owners.
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PA91U