CIRRUS PA93_10

PA93
PA93
®
P r o d uPA93
ct Innovation From
High Voltage Power Operational Amplifiers
FEATURES
DESCRIPTION
The PA93 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 Precision Power’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
Q14B
Q14A
–IN
ILIM
Q8
R7
Q11
R6
R5
R8
R9
Q12
OUT
Q13
R15
+IN
Q16
Q15
R11
–VS
Q18
R12
EXTERNAL CONNECTIONS
1
2
3
4
5
6
7
8
9
10
11
12
PATENTED
Rc
–IN
Cc
RCL
+IN
*
IQ
(See text.)
TO LOAD
AND FEEDBACK
*
–Vs
+Vs
* Bypassing required.
PA93U
www.cirrus.com
12-pin SIP
PACKAGE
STYLE DP
Formed leads available
See package style EE
Copyright © Cirrus Logic, Inc. 2010
(All Rights Reserved)
MAR 20101
APEX − PA93UREVJ
®
PA93
Product Innovation From
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
14
A
POWER DISSIPATION, continuous @ TC = 25ºC
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 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
2
10
mV
15
50
µV/°C
OFFSET VOLTAGE vs. supply
10
25
OFFSET VOLTAGE vs. time
75
BIAS CURRENT, initial
200
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE vs. temperature
Full temperature range
BIAS CURRENT vs. supply
4
OFFSET CURRENT, initial
50
INPUT IMPEDANCE, DC
10
INPUT CAPACITANCE
11
4
COMMON MODE VOLTAGE RANGE
(Note 3)
±Vs Ŧ 15
COMMON MODE REJECTION, DC
VCM = ±90V
NOISE
100KHz BW, RS = 1KΩ,
CC = 10pF
80
µV/V
µV/kHz
2000
pA
pA/V
500
pA
Ω
pF
V
98
dB
1
µV RMS
111
dB
GAIN
OPEN LOOP @ 15Hz
RL = 2KΩ, CC = 10pF
94
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
50
V/µS
OUTPUT
VOLTAGE SWING (Note 3)
IO = 8mA
CURRENT, continuous
8
SLEW RATE, A V = 100
CC = 10pF
CAPACITIVE LOAD, A V = +1
Full temp range
2
±VS Ŧ 12
1
A
nF
PA93U
®
PA93
Product Innovation From
Parameter
Test Conditions1
SETTLING TIME to 0.1%
Min
Typ
CC = 10pF, 2V step
RESISTANCE, no load
Max
Units
1
µS
10
Ω
POWER SUPPLY
VOLTAGE (Note 5)
±40
±150
±200
V
10
14
mA
CURRENT, quiescent
THERMAL
RESISTANCE, AC, junction to case
(Note 4)
Full temp range, F > 60Hz
0.7
°C/W
RESISTANCE, DC, junction to case
Full temp range, F < 60Hz
1
°C/W
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
RF
LOW POWER, PIEZOELECTRIC POSITIONING
+VS
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 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.
R IN
1
COMPUTER
FOCUS
COMMAND
VOLTAGE
7,8
50
0
270
100k
25
50
75
100
125
CASE TEMPERATURE, TC (°C)
N LOOP GAIN, A (dB)
40
30
PA93U
20
10
CC = 220pF
CC = 100pF
CC = 47pF
CC = 10pF
OP FROM SUPPLY, VS – VO (V)
SMALL SIGNAL RESPONSE
50
CC = 220pF
CC = 100pF
CC = 47pF
CC = 10pF
225
25
0
180
9
8
7
1M
10M
FREQUENCY F (Hz)
9,10
R CL
NORMALIZED QUIES. CURRENT
1.8
1.6
1.4
1.2
1.0
25
OUTPUT VOLTAGE SWING
75
125
50
100
CASE TEMPERATURE, TC (°C)
POWER RESPONSE
400
UT VOLTAGE, VO (VP-P)
PHASE, Ф (°)
INTERNAL POWER DISSIPATION
PHASE RESPONSE
135
75
V OUT
–V S
90
100
6
2
NORMALIZED QUIESCENT CURRENT, IQ (X)
POWER DERATING
PIEZO DRIVE
PA93
TYPICAL PERFORMANCE GRAPHS
125
11,12
100
CC = 10pF
CC = 47pF
3
50
180
PA93
270
100k
25
50
75
100
125
CASE TEMPERATURE, TC (°C)
1.2
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, (%)
10
8
6
4
3
.01
2
1
10
20 30 40 60 100
200 300
EXT. COMPENSATION CAPACITOR, CC (pF)
100
CC = 100pF
CC = 220pF
10
1K
8
.001
100
1K
FREQUENCY, F (Hz)
10K
CC = 10pF
CC = 47pF
10K
100K
FREQUENCY, F (Hz)
1M
INPUT NOISE VOLTAGE
HARMONIC DISTORTION
.1
20
POWER RESPONSE
7
SLEW RATE
60
75
125
50
100
CASE TEMPERATURE, TC (°C)
400
8
5
1.0
25
OUTPUT VOLTAGE SWING
9
INPUT NOISE VOLTAGE, VN (nV√Hz)
OPEN LOOP GAIN, A (dB)
CC = 220pF
CC = 100pF
CC = 47pF
CC = 10pF
40
VOLTAGE DROP FROM SUPPLY, VS – VO (V)
SMALL SIGNAL RESPONSE
1M
10M
FREQUENCY F (Hz)
OUTPUT VOLTAGE, VO (VP-P)
0
1.4
Product Innovation From
50
SLEW RATE, (V/μS)
CC = 220pF
CC = 100pF
CC = 47pF
CC = 10pF
®
225
25
0
NORMALIZED QUIESCENT CU
PHASE, Ф (°)
INTERNAL POWER DIS
75
20
15
10
7
5
3
2
10
100
1K
10K
FREQUENCY, F (Hz)
100K
CURRENT LIMIT
CURRENT LIMIT, ILIM (A)
8
PHASE COMPENSATION
6
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.
4
2
0
.1
.4
.2
.3
.5
.6
RESISTOR VALUE, RCL (Ω)
0
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 16 ohms.
4
.65 RCL = ILIM PA93U
®
PA93
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
20
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.
SOA
DC, TC = 25C
10
8
6
200mS
4
3
10
0m
2
S
DC
,T
1
.8
.6
C
DC
,T
C
.4
.3
=1
=8
5C
25
C
.2
.1
.08
.06
10
20 30 40 60 80 100
200 300 500
Although the PA93 can withstand differential voltages up
to ±20V, additional external protection is recommended.
SUPPLY TO OUTPUT DIFFERENTIAL, VS – VO (V)
Low leakage, low capacitance JFETs connected as diodes are recommended (e.g. 2N4416, Q1-Q4 in Figure 2). The differen+VS
tial input voltage will be clamped to ±1.4V. This is sufficient overdrive to
Z1
produce maximum power bandwidth.
POWER SUPPLY PROTECTION
–IN
1
11, 12
Q1
Q3
Unidirectional zener diode transient suppressors are recommended as
6
PA93
protection on the supply pins. See Figure 2. The zeners clamp transients
Q2
Q4
to voltages within the power supply rating and also clamp power supply +IN
7, 8
2
reversals to ground. Whether the zeners are used or not, the system
power supply should be evaluated for transient performance including
Z2
FIGURE 2.
power-on overshoot and power-off polarity reversals as well as line regu- OVERVOLTAGE
–VS
PROTECTION
lation.
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.
STABILITY
The PA93 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.
PA93U
5
PA93
®
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
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does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
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All other brand and product names in this document may be trademarks or service marks of their respective owners.
6
PA93U