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P r o d u c t In n o v a t i nnova PA61, IPA61A o n FFr roomm
PA61 * PA61A PA61 * PA61A
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
* PROGRAMMABLE POWER SUPPLY * MOTOR/SYNCRO DRIVER * VALVE AND ACTUATOR CONTROL * DC OR AC POWER REGULATOR * FIXED FREQUENCY POWER OSCILLATOR
8-PIN TO-3 PACKAGE STYLE CE
RF1 SENSE HI +42V 10V RIN1
DAC
RCL+
OUT RW
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" .
RIN2
PA61 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.
EQUIVALENT SCHEMATIC
3
Q1A
Q1B
EXTERNAL CONNECTIONS
4
Q3 A1
1
+VS +IN
4
RCL+ CL+
3 2 1
5
OUT
Q4 C1 QA QB
8
OUTPUT
TOP VIEW
5
-IN
6
8 7
RCL- CL-
-VS
N.C.
PA61U
http://www.cirrus.com
Copyright (c) Cirrus Logic, Inc. 2009 (All Rights Reserved)
MAY 2009 1 APEX - PA61UREVL
P r o d u c t I n n o v a t i o nF r o m
PA61 * PA61A
OUTPUT VOLTAGE SWING CURRENT LIMIT
INTERNAL POWER DISSIPATION, P (W)
100 80 60 40 20 0
POWER DERATING
T = TC
VOLTAGE DROP FROM SUPPLY (V)
5.5 5.0
7 6
CURRENT LIMIT, ILIM (A)
4.5 4.0 3.5 3.0 2.5
5 4 3 2 1 0 -25
R
CL
= .1
2
TC
=-
TC
C 25
o8 5t 5C
=2
RCL = 0.3
0
25 50 75 100 125 TEMPERATURE, TC (C)
150
0
2 4 6 8 OUTPUT CURRENT, IO (A)
10
0 25 75 50 100 125 CASE TEMPERATURE, TC (C)
SMALL SIGNAL RESPONSE
120
0 -30 -60
PHASE RESPONSE
OUTPUT VOLTAGE, VO (VP-P)
80 58 41 30 21 15 11 8
10K
POWER RESPONSE
VS = 40V
OPEN LOOP GAIN, AOL (dB)
100 80
PHASE, ()
60 40 20 0 10 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz)
-90 -120 -150 -180 -210 1 10 100 1K 10K .1M 1M 10M FREQUENCY, F (Hz)
RL = 8
RL = 3
-20 1
20K
30K
50K 70K
.1M
FREQUENCY, F (Hz)
COMMON MODE REJECTION, CMR (dB)
6
AV = +1
RL = 5
NORMALIZED BIAS CURRENT, IB (X)
8
PULSE RESPONSE
120 100 80 60 40 20 0 1
COMMON MODE REJECTION
2.5 2.2 1.9 1.6 1.3 1.0 .7 .4 -50 -25
BIAS CURRENT
OUTPUT VOLTAGE, VO (V)
4 2 0
-2 -4 -6 -8 0 2 4 6 8 TIME, t (s) 10 12 14
10
100 1K 10K .1M FREQUENCY, F (Hz)
1M
0
25
50
75
100 125
CASE TEMPERATURE, TC (C)
NORMALIZED QUIESCENT CURRENT, IQ (X)
3
VS = 36 RL = 4 AV = 10
INPUT NOISE VOLTAGE, V (nV/Hz)
10
HARMONIC DISTORTION
1.6 1.4 1.2 1.0 .8 .6 .4
QUIESCENT CURRENT
100 70 50 40 30 20
INPUT NOISE
DISTORTION, (%)
1
PO
.3 .1 .03 .01 30
=.
1W
P
O
=
5W
T C = 125C
T C = 25C
PO
=
50
W
TC
=-
C 55
100
300 1K 3K 10K 30K FREQUENCY, F (Hz)
20 30 40 50 60 70 80 90 TOTAL SUPPLY VOLTAGE, VS (V)
10 10
100 10K 1K FREQUENCY, F (Hz)
.1M
PA61U
3
PA61 * PA61A
GENERAL
P r o d u c t I n n o v a t i o nF r o m
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)
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.
INPUT CURRENT FROM +VS OR -VS (A)
10 8.0 6.0 4.0 3.0 2.0 1.5 1.0 .8 .6 .4 .3 .2 .1 10 15 20 25 30 40 50 60 70 80 90 SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE VS - VO (V)
SAFE OPERATING AREA (SOA)
t=
TC = 25C TC = 85C TC = 125 C
t=
1m
s
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-
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=85C. 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.
0. 5m s
t= 5m s
St ea
dy St at e
4
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 apex.support@cirrus.com. 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 MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER'S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS' FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES. 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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5

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