CIRRUS PA93-27

PA93/27
PA93/27
P r o d u c t IInnnnoovvaa t i o n FFr roomm
High Voltage Power Operational Amplifiers
FEATURES
DESCRIPTION
The PA93/27 is a high voltage, low quiescent current
MOSFET operational amplifier designed as a low cost
solution for driving continuous output currents up to 8A
and pulse currents up to 14A. 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’s Power SIP package
uses a minimum of board space allowing for high density circuit boards. The Power SIP package is electrically isolated.
♦ HIGH VOLTAGE — 400V (±200V)
♦ LOW QUIESCENT CURRENT — 10mA
♦ HIGH OUTPUT CURRENT — 8A
♦ PROGRAMMABLE CURRENT LIMIT
APPLICATIONS
♦ PIEZOELECTRIC POSITIONING
♦ HIGH VOLTAGE INSTRUMENTATION
♦ ELECTROSTATIC TRANSDUCERS
♦ PROGRAMMABLE POWER SUPPLIES UP
TO 390V
EQUIVALENT SCHEMATIC
+VS
R1A
C1
R1B
Q1
R3
Q3
Q2
R4
Q4
Q6
CC2
Q5
CC1
Q14A
–IN
R9
Q12
OUT
Q13
R15
Q15
www.cirrus.com
R7
Q11
R6
+IN
PA93/27U
Q8
Q14B
R5
R8
–VS
ILIM
R11
Q18
Q16
R12
Copyright © Cirrus Logic, Inc. 2010
(All Rights Reserved)
MAR 20101
APEX - PA93-27UREVD
PA93/27
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
PATENTED
Cc
RCL
+IN
IQ
(See text.)
*
–Vs
*
TO LOAD
AND FEEDBACK
12-pin SIP
PACKAGE
STYLE DP
+Vs
Formed leads available
See package style EE
* Bypassing required.
1. CHARACTERISTICS AND SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Max
Units
SUPPLY VOLTAGE, +VS to -VS
Parameter
Symbol
Min
400
V
OUTPUT CURRENT, source, sink, peak, within SOA
14
A
POWER DISSIPATION, continuous @ TC = 25°C
125
W
INPUT VOLTAGE, differential
-20
20
V
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 PA93/27 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
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE vs. temperature
Full temperature range
OFFSET VOLTAGE vs. supply
2
10
mV
15
50
µV/°C
10
25
µV/V
OFFSET VOLTAGE vs. time
75
BIAS CURRENT, initial
200
BIAS CURRENT vs. supply
4
OFFSET CURRENT, initial
50
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE
(Note 3)
VCM = ±90V
NOISE
100KHz bandwidth, RS = 1KΩ,
CC = 10pF
80
pA
pA/V
500
pA
1011
Ω
4
pF
±VS Ŧ 15
COMMON MODE REJECTION, DC
2
µV/kHz
2000
V
98
dB
1
µV RMS
PA93/27U
PA93/27
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
94
Max
Units
GAIN
OPEN LOOP, @ 15Hz
RL = 2KΩ, CC = 10pF
111
dB
GAIN BANDWIDTH PRODUCT @ 1MHz
RL = 2KΩ, CC = 10pF
12
MHz
POWER BANDWIDTH
RL = 2KΩ, CC = 10pF
30
kHz
PHASE MARGIN
Full temp range
60
°
±VS Ŧ 10
V
OUTPUT
VOLTAGE SWING (Note 3)
IO = 8A
±VS Ŧ 12
CURRENT, continuous
8
SLEW RATE, A V = 100
CC = 10pF
CAPACITIVE LOAD, A V = +1
Full temp range
SETTLING TIME to 0.1%
CC = 10pF, 2V step
A
50
V/µS
1
µS
10
Ω
1
nF
RESISTANCE, no load
POWER SUPPLY
VOLTAGE (Note 5)
±40
±150
±200
V
CURRENT, quiescent
9.5
11
14
mA
0.7
°C/W
1
°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. Unless otherwise noted: TC = 25°C, DC input specifications are ± value given. Power supply voltage
is typical rating. RC = 100 CC = 220pF.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate
internal 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
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 PA93/27 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.
RF
+VS
R IN
1
11,12
PIEZO DRIVE
PA93
6
V OUT
2
COMPUTER
FOCUS
COMMAND
VOLTAGE
7,8
9,10
R CL
–V S
PA93/27U
3
PA93/27
PHASE RESPONSE
90
100
PHASE, Ф (°)
135
75
50
180
270
100k
25
50
75
100
125
CASE TEMPERATURE, TC (°C)
40
30
20
10
0
–10
100K
1M
10M
FREQUENCY, F (Hz)
6
0
4
2
6
OUTPUT CURRENT, IO (A)
PO = 1W
PO = 20W
PO = 62W
40
30
DISTORTION, (%)
4
3
.01
2
1
10
20 30 40 60 100
200 300
EXT. COMPENSATION CAPACITOR, CC (pF)
1.2
1.0
25
100
.001
75
125
50
100
CASE TEMPERATURE, TC (°C)
CC = 100pF
CC = 220pF
10
1K
8
100
1K
FREQUENCY, F (Hz)
10K
CC = 10pF
CC = 47pF
10K
100K
FREQUENCY, F (Hz)
1M
INPUT NOISE VOLTAGE
HARMONIC DISTORTION
.1
10
8
6
1.4
POWER RESPONSE
7
SLEW RATE
60
20
1.6
400
8
5
NORMALIZED QUIES. CURRENT
1.8
OUTPUT VOLTAGE SWING
9
INPUT NOISE VOLTAGE, VN (nV√Hz)
OPEN LOOP GAIN, A (dB)
CC = 220pF
CC = 100pF
CC = 47pF
CC = 10pF
VOLTAGE DROP FROM SUPPLY, VS – VO (V)
SMALL SIGNAL RESPONSE
1M
10M
FREQUENCY F (Hz)
OUTPUT VOLTAGE, VO (VP-P)
0
50
SLEW RATE, (V/μS)
CC = 220pF
CC = 100pF
CC = 47pF
CC = 10pF
225
25
0
NORMALIZED QUIESCENT CURRENT, IQ (X)
POWER DERATING
125
INTERNAL POWER DISSIPATION
P r o d u c t I n n o v a t i o nF r o m
20
15
10
7
5
3
2
10
100
1K
10K
FREQUENCY, F (Hz)
100K
CURRENT LIMIT
CURRENT LIMIT, ILIM (A)
8
6
4
2
0
0
.1
.4
.2
.3
.5
.6
RESISTOR VALUE, RCL (Ω)
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
PA93-27U REV A OCTOBER 2006 © 2006 Apex Microtechnology Corp.
PA93/27U
4
PA93/27
P r o d u c t I n n o v a t i o nF r o m
PHASE COMPENSATION
GAIN
CC*
RC
≥1
220pF 100Ω
≥2
100pF 100Ω
≥4
47pF
0Ω
≥17
10pF
0Ω
*CC
Never to be <10pF. CC to be rated for the full supply voltage +VS to -VS. Use ceramic NPO (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’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 16 ohms.
.65 RCL = ILIM 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, (A)
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.
20
SOA
DC, TC = 25C
10
8
6
200mS
4
3
10
0m
2
DC
,T
1
.8
.6
C
DC
,T
C
.4
.3
=1
S
=8
5C
25
C
.2
.1
.08
.06
10
20
30 40
60 80 100
200
300
500
Although the PA93/27 can withstand differential voltages
SUPPLY TO OUTPUT DIFFERENTIAL, VS – VO (V)
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.
PA93/27U
5
PA93/27
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
PA93
Q2
+IN
FIGURE 2.
OVERVOLTAGE
PROTECTION
Q4
2
7, 8
Z2
–VS
STABILITY
The PA93/27 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 lowers quiescent power
but also raises distortion since the output stage is then class C biased. The output stage bias current is nominally
set at 1mA. 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
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6
PA93/27U