CIRRUS PA92_10

PA92
PA92
®
P r o d uPA92
ct Innovation From
High Voltage Power Operational Amplifiers
FEATURES
DESCRIPTION
The PA92 is a high voltage, low quiescent current
MOSFET operational amplifier designed as a low cost
solution for driving continuous output currents up to 4A
and pulse currents up to 7A. 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 — 4A
♦ PROGRAMMABLE CURRENT LIMIT
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
R3
R4
5
CC2
ILIM
9
Q8
R7
Q14B
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
*
–Vs
+Vs
* Bypassing required.
PA92U
www.cirrus.com
PATENTED
12
12-pin SIP
PACKAGE
STYLE DP
Formed leads available
See package style EE
Copyright © Cirrus Logic, Inc. 2010
(All Rights Reserved)
MAR 20101
APEX − PA92UREVL
®
PA92
Product Innovation From
CHARACTERISTICS AND SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Min
SUPPLY VOLTAGE, +VS to -VS
Max
Units
400
V
7
A
80
W
20
V
OUTPUT CURRENT, source, sink, peak, within SOA
POWER DISSIPATION, continuous @ TC = 25°C
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 PA92 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 Conditions
Min
Typ
Max
Units
2
10
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
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 bandwidth,
RS = 1KΩ, CC = 10pF
80
µV/kh
2000
pA
pA/V
500
pA
Ω
pF
V
98
dB
1
µV RMS
GAIN
OPEN LOOP @ 15Hz
RL = 2KΩ, CC = 10pF
111
dB
GAIN BANDWIDTH PRODUCT @ 1MHz
RL = 2KΩ, CC = 10pF
94
18
MHz
POWER BANDWIDTH
RL = 2KΩ, CC = 10pF
30
kHz
PHASE MARGIN
Full temperature range
60
°
±VS Ŧ 10
V
50
V/µS
OUTPUT
VOLTAGE SWING (Note 3)
IO = 4A
CURRENT, continuous
4
SLEW RATE, A V = 100
CC = 10pF
CAPACITIVE LOAD, A V = +1
Full temperature range
2
±VS Ŧ 12
1
A
nF
PA92U
®
PA92
Product Innovation From
Parameter
Test Conditions
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)
±50
±150
±200
V
10
14
mA
1
°C/W
1.5
°C/W
CURRENT, quiescent
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.
TYPICAL PERFORMANCE GRAPHS
PHASE RESPONSE
135
20
CC = 150pF
CC = 10pF
0
270
100k
25
50
75
100
125
CASE TEMPERATURE, TC (°C)
OUTPUT VOLTAGE SWING
SMALL SIGNAL RESPONSE
40
30
CC = 150pF
CC = 100pF
CC = 47pF
CC = 10pF
20
10
0
1M
10M
FREQUENCY, F (Hz)
8.0
7.5
7.0
6.5
0
3
2
1
OUTPUT CURRENT, IO (A)
1.6
1.4
1.2
1.0
25
100
CC = 10pF
CC = 47pF
CC = 100pF
10
4
, (%)
40
PA92U
30
PO = 1W
PO = 20W
PO = 62W
CC = 150pF
1K
10K
100K
FREQUENCY, F (Hz)
1M
INPUT NOISE VOLTAGE
HARMONIC DISTORTION
.1
50
100
125
75
CASE TEMPERATURE, TC (°C)
POWER RESPONSE
400
8.5
SLEW RATE
60
20
1M
10M
FREQUENCY F (Hz)
OUTPUT VOLTAGE, VO(VP-P)
0
–10
100K
(V/μS)
CC = 100pF
CC = 47pF
225
50
OPEN LOOP GAIN, A (dB)
180
GE, V (nV√Hz)
40
NORMALIZED QUIESCENT CURRENT
NORMALIZED QUIESCENT CURRENT, IQ (X)
60
PHASE, Ф (°)
90
VOLTAGE DROP FROM SUPPLY, VS – VO (V)
INTERNAL POWER DISSIPATION, P(W)
POWER DERATING
80
20
15
10
3
10
PA92
0
–10
100K
1M
10M
FREQUENCY, F (Hz)
7.5
7.0
Product Innovation From
6.5
0
3
2
1
OUTPUT CURRENT, IO (A)
INPUT NOISE VOLTAGE, V (nV√Hz)
DISTORTION, (%)
4
3
.01
2
1
30
60 100
200 300
10
EXT. COMPENSATION CAPACITOR, CC (pF)
CC = 47pF
CC = 100pF
CC = 150pF
1K
.001
100
1K
FREQUENCY, F (Hz)
10K
100K
FREQUENCY, F (Hz)
1M
INPUT NOISE VOLTAGE
PO = 1W
PO = 20W
PO = 62W
40
30
10
8
6
CC = 10pF
10
4
.1
20
100
HARMONIC DISTORTION
SLEW RATE
60
SLEW RATE, (V/μS)
®
OUTPUT VOLTAGE, V
20
VOLTAGE DROP FROM SUPPL
OPEN LOOP GAIN, A
CC = 10pF
30
10K
20
15
10
7
5
3
2
10
100
1K
10K
FREQUENCY, F (Hz)
100K
CURRENT LIMIT
CURRENT LIMIT, ILIM (A)
4
PHASE COMPENSATION
3
GAIN
CC*
RC
≥1
150pF
100Ω
≥2
100pF
100Ω
≥3
47pF
0Ω
≥12
10pF
0Ω
*CC Never to be <10pF. CC to be rated for the full supply
voltage +V to -Vs. Use ceramic NPO (COG) type.
2
1
0
0.0
0.2 0.4 0.6 0.8 1.0 1.2
RESISTOR VALUE, RCL (Ω)
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
.65 RCL = ILIM 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.
4
SOA
8
6
OUTPUT CURRENT FROM +VS OR –VS, (A)
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.
DC, TC = 25C
200mS
4
2
10
0m
1
.8
.6
T
C
T
C
.4
.3
=
S
=
85
C
12
5C
.2
.1
.08
.06
.04
10
20
30 40
60 80 100
200 300
500
SUPPLY TO OUTPUT DIFFERENTIAL, VS –VO (V)
PA92U
®
PA92
Product Innovation From
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
Although the PA92 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, Q1Q4 in Figure 2). The differential input voltage will be clamped to ±1.4V.
This is sufficient overdrive to produce maximum power bandwidth.
POWER SUPPLY PROTECTION
+VS
Z1
1
–IN
Q1
11, 12
Q3
PA90
Q2
+IN
6
Q4
2
7, 8
Unidirectional zener diode transient suppressors are recommended as
protection on the supply pins. See Figure 2. The zeners clamp transients FIGURE 2.
Z2
to voltages within the power supply rating and also clamp power supply OVERVOLTAGE
–VS
reversals to ground. Whether the zeners are used or not, the system PROTECTION
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.
STABILITY
The PA92 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.
PA92U
5
PA92
®
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
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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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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PA92U