CIRRUS PA61A

PA61PA61
• PA61A
• PA61A
P r o d u c t IPA61A
Innnnoovvaa t i o n FFr roomm
PA61,
Power Operational Amplifiers
FEATURES
• WIDE SUPPLY RANGE — ±10 to ±45V
• HIGH OUTPUT CURRENT — ±10A Peak
• LOW COST — Class “C” output stage
• LOW QUIESCENT CURRENT — 3mA
APPLICATIONS
8-pin TO-3
PACKAGE STYLE CE
• PROGRAMMABLE POWER SUPPLY
• MOTOR/SYNCRO DRIVER
• VALVE AND ACTUATOR CONTROL
• DC OR AC POWER REGULATOR
• FIXED FREQUENCY POWER OSCILLATOR
RF1 SENSE HI
+42V
±10V RIN1
DAC
DESCRIPTION
The PA61 and PA61A are high output current operational
amplifiers designed to drive resistive, inductive and capacitive loads. Their complementary emitter follower output stage
is the simple class C type and optimized for low frequency
applications where crossover distortion is not critical. These
amplifiers are not recommended for audio, transducer or
deflection coil drive circuits above 1kHz or when distortion is
critical. The safe operating area (SOA) is fully specified and
can be observed for all operating conditions by selection of
user programmable current limiting resistors. Both amplifiers
are internally compensated for all gain settings. For continuous operation under load, mounting on a heatsink of proper
rating is recommended.
This hybrid circuit utilizes thick film conductors, ceramic
capacitors, and semiconductor chips to maximize reliability, minimize size, and give top performance. Ultrasonically
bonded aluminum wires provide reliable interconnections at
all operating temperatures. The 8-pin TO-3 package is electrically isolated and hermetically sealed. The use of compressible thermal washers and/or improper mounting torque
voids the product warranty. Please see “General Operating
Considerations”.
EQUIVALENT SCHEMATIC
3
Q1A
Q1B
2
RCL–
–42V
LOAD
RF2 SENSE LO
RTN
RW
FIGURE 1. PROGRAMMABLE POWER SUPPLY
WITH REMOTE SENSING
TYPICAL APPLICATION
Due to its high current drive capability, PA61 applications
often utilize remote sensing to compensate IR drops in the
wiring. The importance of remote sensing increases as accuracy requirements, output currents, and distance between
amplifier and load go up. The circuit above shows wire resistance from the PA61 to the load and back to the local ground
via the power return line. Without remote sensing, a 7.5A load
current across only 0.05 ohm in each line would produce a
0.75V error at the load.
With the addition of the second ratio matched RF/RIN pair
and two low current sense wires, IR drops in the power return
line become common mode voltages for which the op amp
has a very high rejection ratio. Voltage drops in the output and
power return wires are inside the feedback loop. Therefore, as
long as the Power Op Amp has the voltage drive capability to
overcome the IR losses, accuracy remains the same. Application Note 7 presents a general discussion of PPS circuits.
EXTERNAL CONNECTIONS
RCL+
A1
1
+VS
5
CL+
3
2
1
Q4
+IN
C1
Q6B
OUT
OUTPUT
4
TOP VIEW
8
Q6A
5
–IN
6
–VS
6
http://www.cirrus.com
OUT
RW
PA61
RIN2
Q3
4
PA61U
RCL+
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
RCL–
8
7
CL–
N.C.
MAY 20091
APEX − PA61UREVL
PA61 • PA61A
P r o d u c t I n n o v a t i o nF r o m
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to –VS
OUTPUT CURRENT, within SOA
POWER DISSIPATION, internal
INPUT VOLTAGE, differential
INPUT VOLTAGE, common mode
TEMPERATURE, pin solder-10s
TEMPERATURE, junction1
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE RANGE, case
SPECIFICATIONS
PARAMETER
TEST CONDITIONS 2
INPUT
OFFSET VOLTAGE, initial
OFFSET VOLTAGE, vs. temperature
OFFSET VOLTAGE, vs. supply
OFFSET VOLTAGE, vs. power
BIAS CURRENT, initial
BIAS CURRENT, vs. temperature
BIAS CURRENT, vs. supply
OFFSET CURRENT, initial
OFFSET CURRENT, vs. temperature
INPUT IMPEDANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE3
COMMON MODE REJECTION, DC3
TC = 25°C
Specified temperature range
TC = 25°C
TC = 25°C
TC = 25°C
Specified temperature range
TC = 25°C
TC = 25°C
Specified temperature range
TC = 25°C
TC = 25°C
Specified temperature range
Specified temperature range
GAIN
OPEN LOOP GAIN at 10Hz
GAIN BANDWIDTH PRODUCT at 1MHz
POWER BANDWIDTH
PHASE MARGIN
Full temp. range, full load
TC = 25°C, full load
TC = 25°C, IO = 8A, VO = 40VPP
Full temperature range
OUTPUT
VOLTAGE SWING3
VOLTAGE SWING3
VOLTAGE SWING3
CURRENT
SETTLING TIME to .1%
SLEW RATE
CAPACITIVE LOAD, unit gain
CAPACITIVE LOAD, gain>4
TC = 25°C, IO = 10A
Full temp. range, IO = 4A
Full temp. range, IO = 68mA
TC = 25°C
TC = 25°C, 2V step
TC = 25°C, RL = 6Ω
Full temperature range
Full temperature range
POWER SUPPLY
VOLTAGE
CURRENT, quiescent
Full temperature range
TC = 25°C
THERMAL
RESISTANCE, AC, junction to case4
RESISTANCE, DC, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
MIN
PA61
TYP
PA61A
MAX
MIN TYP
±VS–5
74
±2
±10
±30
±20
12
±50
±10
±12
±50
200
3
±VS–3
100
±6
±65
±200
30
±500
±30
*
*
96
10
±VS–7
±VS–6
±VS–5
±10
1.0
±10
F > 60Hz
F < 60Hz
Meets full range specification
90V
10A
97W
±37V
±VS
300°C
200°C
–65 to +150°C
–55 to +125°C
–25
MAX
UNITS
±1
±4
*
±40
*
*
*
10
20
*
*
*
±5
±10
*
*
*
*
*
mV
µV/°C
µV/V
µV/W
nA
pA/°C
pA/V
nA
pA/°C
MΩ
pF
V
dB
*
*
*
*
dB
MHz
kHz
°
±VS–6
*
*
*
*
*
*
*
*
1.5
*
SOA
*
V
V
V
A
µs
V/µs
nF
±32
3
±45
*
10
*
*
V
mA
1.0
1.5
30
25
1.2
1.8
+85
*
*
*
*
*
*
*
*
108
1
16
45
±VS–5
±VS–4
2
2.8
*
*
*
*
°C/W
°C/W
°C/W
°C
NOTES: * The specification of PA61A is identical to the specification for PA61 in applicable column to the left.
1. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to
achieve high MTTF.
2. The power supply voltage for all specifications is the TYP rating unless noted as a test condition.
3. +VS and –VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to –VS.
4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
CAUTION
2
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
subject to temperatures in excess of 850°C to avoid generating toxic fumes.
PA61U
PA61 • PA61A
OUTPUT VOLTAGE SWING
POWER DERATING
40
20
0
0
25
50
75
100 125
TEMPERATURE, TC (°C)
150
SMALL SIGNAL RESPONSE
5.0
6
4.5
2.5
–60
PHASE, Ф (°)
80
2
4
6
8
OUTPUT CURRENT, IO (A)
PHASE RESPONSE
PULSE RESPONSE
AV = +1
6
RL = 5Ω
4
2
0
–2
–4
–6
–8
0
2
4
6
8
TIME, t (µs)
10
12 14
–210
HARMONIC DISTORTION
10
VS = ±36
RL = 4Ω
AV = 10
3
1W
1
PO
=.
.3
P
.1
O
=
5W
W
=
50
PO
.03
30
PA61U
100
300
1K
3K
10K 30K
FREQUENCY, F (Hz)
1
120
80
60
40
20
0
1
1.6
10
100
1K 10K .1M
FREQUENCY, F (Hz)
1.0
.8
T C = 125°C
T C = 25°C
°C
55
TC
=–
.6
.4
20 30 40 50 60 70 80 90
TOTAL SUPPLY VOLTAGE, VS (V)
RCL = 0.3
Ω
2
1
0
25
75
50
100 125
CASE TEMPERATURE, TC (°C)
POWER RESPONSE
VS = ±40V
58
41
RL = 8Ω
30
21
15
RL = 3Ω
11
20K
30K
50K 70K
.1M
BIAS CURRENT
2.5
2.2
1.9
1.6
1.3
1.0
.7
.4
–50 –25
0
25
50
75
100 125
CASE TEMPERATURE, TC (°C)
QUIESCENT CURRENT
1.2
2Ω
FREQUENCY, F (Hz)
1M
1.4
= .1
3
10K
COMMON MODE REJECTION
100
CL
8
100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
10
NORMALIZED BIAS CURRENT, IB (X)
100 1K 10K .1M 1M 10M
FREQUENCY, F (Hz)
R
4
80
–150
CURRENT LIMIT
5
0
–25
10
–120
COMMON MODE REJECTION, CMR (dB)
10
8
OUTPUT VOLTAGE, VO (V)
0
–180
0
–20
1
DISTORTION, (%)
TC
5°C
o8
5 t
=2
–90
NORMALIZED QUIESCENT CURRENT, IQ (X)
OPEN LOOP GAIN, AOL (dB)
–30
.01
=–
3.0
100
20
TC
3.5
0
40
C
25°
4.0
120
60
CURRENT LIMIT, ILIM (A)
60
7
OUTPUT VOLTAGE, VO (VP-P)
T = TC
80
5.5
INPUT NOISE VOLTAGE, V (nV/√Hz)
100
VOLTAGE DROP FROM SUPPLY (V)
INTERNAL POWER DISSIPATION, P (W)
P r o d u c t I n n o v a t i o nF r o m
100
INPUT NOISE
70
50
40
30
20
10
10
100
10K
1K
FREQUENCY, F (Hz)
.1M
3
PA61 • PA61A
P r o d u c t I n n o v a t i o nF r o m
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 and heat sink selection. The "Application Notes"
and "Technical Seminar" sections contain a wealth of information on specific types of applications. Package outlines, heat
sinks, mounting hardware and other accessories are located
in the "Packages and Accessories" section. Evaluation Kits
are available for most Apex Precision Power product models,
consult the "Evaluation Kit" section for details. For the most
current version of all Apex Precision Power product data sheets,
visit www.Cirrus.com.
SAFE OPERATING AREA (SOA)
5m
s
1m
s
s
5m
dy
ea
e
at
St
1.0
.8
.6
t=
St
2.0
1.5
TC =
25°C
TC =
85°C
TC =
125°
C
0.
4.0
3.0
SAFE OPERATING AREA (SOA)
t=
10
8.0
6.0
t=
INPUT CURRENT FROM +VS OR –VS (A)
The output stage of most power amplifiers has 3 distinct
limitations:
1. The current handling capability of the transistor geometry
and the wire bonds.
2. The second breakdown effect which occurs whenever the
simultaneous collector current and collector-emitter voltage
exceeds specified limits.
.4
.3
.2
.1
10
15
20
25 30
40
50 60 70 80 90
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE VS – VO (V)
3. The junction temperature of the output transistors.
The SOA curves combine the effect of all limits for this Power
Op Amp. For a given application, the direction and magnitude
of the output current should be calculated or measured and
checked against the SOA curves. This is simple for resistive
loads but more complex for reactive and EMF generating loads.
The following guidelines may save extensive analytical efforts.
1. Under transient conditions, capacitive and dynamic* induc-
4
tive loads up to the following maximum are safe:
CAPACITIVE LOAD
INDUCTIVE LOAD
ILIM = 5A
ILIM = 10A
ILIM = 5A
ILIM = 10A
VS
45V
200 F
150 F
8mH
2.8mH
40V
400 F
200 F
11mH
4.3mH
35V
800 F
400 F
20mH
5.0mH
30V
1600 F
800 F
35mH
6.2mH
25V
5.0mF
2.5mF
50mH
15mH
20V
10mF
5.0mF
400mH
20mH
15V
20mF
10mF
**
100mH
* If the inductive load is driven near steady state conditions,
allowing the output voltage to drop more than 8V below the
supply rail with ILIM = 10A or 15V below the supply rail with
ILIM = 5A while the amplifier is current limiting, the inductor
should be capacitively coupled or the current limit must be
lowered to meet SOA criteria.
** Second breakdown effect imposes no limitation but thermal
limitations must still be observed.
2. The amplifier can handle any EMF generating or reactive
load and short circuits to the supply rail or shorts to common
if the current limits are set as follows at TC=85°C.
SHORT TO VS ±
SHORT TO
C, L, OR EMF LOAD
COMMON
±VS
45V
0.1A
1.3A
40V
0.2A
1.5A
35V
0.3A
1.6A
30V
0.5A
2.0A
25V
1.2A
2.4A
20V
1.5A
3.0A
15V
2.0A
4.0A
These simplified limits may be exceeded with further analysis
using the operating conditions for a specific application.
3. The output stage is protected against transient flyback.
However, for protection against sustained, high energy flyback,
external fast-recovery diodes should be used.
PA61U
P r o d u c t I n n o v a t i o nF r o m
PA61 • PA61A
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.
PA61U
5