CIRRUS PA90

PA90
PA90
P r o d u c t IInnnnoovvaa t i o n FFr roomm
High Voltage Power Operational Amplifiers
FEATURES
DESCRIPTION
The PA90 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 — 400V (±200V)
♦ 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 390V
EQUIVALENT SCHEMATIC
12
11
+VS
R1 R2
Q1
C1
Q3
Q2
Q6
4
CC1
Q5
Q14A
1
–IN
R4
5
CC2
Q8
R7
R9
Q12
6
OUT
Q13
3
IQ
Q15
R11
10
Q11
R6
2
+IN
Q4
ILIM
9
Q14B
R5
R8
–VS
7
R3
R10
Q17
Q16
R12
8
PA90U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
JUN 20091
APEX − PA90UREVJ
PA90
P r o d u c t I n n o v a t i o nF r o m
EXTERNAL CONNECTIONS
1
2
3
4
5
Rc
–IN
6
7
8
9
10
11
12
Cc
RCL
+IN
*
IQ
(See text.)
12-pin SIP
PACKAGE
STYLE DP
*
–Vs
TO LOAD
AND FEEDBACK
+Vs
Formed leads available
See package EE
* Bypassing required.
1. Characteristics and Specifications
Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Units
SUPPLY VOLTAGE, +VS to -VS
400
V
OUTPUT CURRENT, source, sink, peak, within SOA
350
mA
POWER DISSIPATION, continuous @ TC = 25°C
30
W
20
V
INPUT VOLTAGE, differential
-20
INPUT VOLTAGE, common mode
-VS
VS
V
TEMPERATURE, pin solder, 10s max.
260
°C
TEMPERATURE, junction (Note 2)
150
°C
TEMPERATURE RANGE, storage
−40
85
°C
OPERATING TEMPERATURE RANGE, case
−25
85
°C
CAUTION
The PA90 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
15
50
µV/°C
25
AMPLIFIER INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE vs. temperature
Full temperature range
OFFSET VOLTAGE vs. supply
10
OFFSET VOLTAGE vs. time
75
BIAS CURRENT, initial
200
BIAS CURRENT vs. supply
4
OFFSET CURRENT, initial
50
INPUT IMPEDANCE, DC
10
INPUT CAPACITANCE
4
±VS Ŧ 15
COMMON MODE VOLTAGE RANGE
(Note 3)
COMMON MODE REJECTION, DC
VCM = ±90V
NOISE
100KHz bandwidth, RS = 1KΩ,
CC = OPEN
2
11
80
µV/V
µV/kHz
2000
pA
pA/V
500
pA
Ω
pF
V
98
dB
1
µV RMS
PA90U
PA90
P r o d u c t I n n o v a t i o nF r o m
Parameter
Test Conditions1
Min
Typ
Max
Units
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
IO = 200mA
±VS Ŧ 12
SLEW RATE, A V = 100
CC = OPEN
240
CAPACITIVE LOAD, A V = +1
Full temperature range
470
SETTLING TIME to 0.1%
CC = OPEN, 2V step
VOLTAGE SWING
(Note 3)
CURRENT, continuous
200
mA
pF
RESISTANCE, no load
1
µS
50
Ω
POWER SUPPLY
VOLTAGE (Note 5)
±40
±150
±200
V
10
14
mA
RESISTANCE, AC, junction to case (Note 4) Full temp range, F > 60Hz
2.5
°C/W
RESISTANCE, DC, junction to case
4.2
°C/W
CURRENT, quiescent
THERMAL
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 .625 V/°C below 25°C case. No derating needed above 25°C case.
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 PA90 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.
+VS
R IN
1
11,12
PIEZO DRIVE
PA90
6
V OUT
2
COMPUTER
FOCUS
COMMAND
VOLTAGE
7,8
9,10
R CL
–V S
PA90U
3
P r o d u c t I n n o v a t i o nF r o m
POWER DERATING
PHASE RESPONSE
90
32
135
16
180
8
0
270
100k
25
50
75 100 125 150
CASE TEMPERATURE, TC (°C)
1
DISTORTION, (%)
SLEW RATE, (V/μS)
0
0.1
.05
0.15
OUTPUT CURRENT, IO (A)
0.2
HARMONIC DISTORTION
.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)
10K
20
RL = 1KΩ
VS = 200V
AV = 63
100K
N
3.5
80
70
60
50
F
4
100
OPE
4.5
200
4.7p
100
70
50
40
30
5
300
CC=
200
5.5
F
300
POWER RESPONSE
400
10p
SLEW RATE
1K
700
500
OUTPUT VOLTAGE SWING
6
F
CC = 68 pF
0 CC = 10 pF
CC = 4.7 pF
–10 CC = OPEN
100K
1M
10M
FREQUENCY, F (Hz)
50
100
75
125
CASE TEMPERATURE, TC (°C)
68p
10
1.0
25
CC=
20
1.1
CC=
30
1.2
CC=
OPEN LOOP GAIN, A (dB)
40
VOLTAGE DROP FROM SUPPLY, VS – VO (V)
SMALL SIGNAL RESPONSE
50
1M
10M
FREQUENCY F (Hz)
OUTPUT VOLTAGE, VO (VP-P)
0
CC = 68 pF
CC = 10 pF
CC = 4.7 pF
CC = OPEN
225
1.3
INPUT NOISE VOLTAGE, V (nV√Hz)
24
NORMALIZED QUIES. CURRENT
NORMALIZED QUIESCENT CURRENT, IQ (X)
40
PHASE, Ф (°)
INTERNAL POWER DISSIPATION, P(W)
PA90
1M
100K
FREQUENCY, F (Hz)
INPUT NOISE VOLTAGE
15
10
7
5
3
2
10
100
1K
10K
FREQUENCY, F (Hz)
100K
CURRENT LIMIT
CURRENT LIMIT, ILIM (A)
.2
.15
.1
.05
0
4
0
4
16 20
8
12
24
RESISTOR VALUE, RCL (Ω)
PA90U
PA90
P r o d u c t I n n o v a t i o nF r o m
PHASE COMPENSATION
GAIN
≥1
≥5
≥10
≥30
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.
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; 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 SOA
500
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.
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)
SAFE OPERATING AREA (SOA)
20
300
0m
10
S
0m
S
200
DC
,T
100
,T
C
,T
C
=
25
°C
85
°C
DC
50
=
C
DC
=
12
5°
30
C
20
PULSE CURVES @ 10% DUTY CYCLE MAX.
10
25
50
75
100 125
250
500
Although the PA90 can withstand differential voltages
up to ±20V, additional external protection is recommended. 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.
PA90U
SUPPLY TO OUTPUT DIFFERENTIAL, VS - VO (V)
5
PA90
P r o d u c t I n n o v a t i o nF r o m
POWER SUPPLY PROTECTION
Unidirectional zener diode transient suppressors are recommended as
protection on the supply pins. See Figure 2. 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.
+VS
Z1
1
–IN
Q1
11, 12
Q3
6
PA90
Q2
+IN
FIGURE 2.
OVERVOLTAGE
PROTECTION
Q4
2
7, 8
Z2
–VS
STABILITY
The PA90 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.
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
parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,
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.
6
PA90U