PA61 [CIRRUS]

POWER OPERATIONAL AMPLIFIERS; 功率运算放大器


型号：	PA61
厂家：	CIRRUS LOGIC
描述：	POWER OPERATIONAL AMPLIFIERS 功率运算放大器运算放大器
文件：	总5页 (文件大小：317K)
中文：	中文翻译
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PA61 • PA61A

P r o d u c t I n n o v a t i o n F r o m

108&3ꢀ01&3"5*0/"-ꢀ".1-*'*&34

FEATURES

•ꢀWIDEꢀSUPPLYꢀRANGEꢀ—ꢀ±1ꢁꢀtoꢀ±±45

•ꢀHIGHꢀOUTPUTꢀCURRENTꢀ—ꢀ±1ꢁAꢀPeak

•ꢀLOWꢀCOSTꢀ—ꢀClassꢀ“C”ꢀoutputꢀstage

•ꢀLOWꢀQUIESCENTꢀCURRENTꢀ—ꢀ3mA

APPLICATIONS

•ꢀPROGRAMMABLEꢀPOWERꢀSUPPLY

•ꢀMOTOR/SYNCROꢀDRI5ER

•ꢀ5AL5EꢀANDꢀACTUATORꢀCONTROL

•ꢀDCꢀORꢀACꢀPOWERꢀREGULATOR

•ꢀFIXEDꢀFREQUENCYꢀPOWERꢀOSCILLATOR

8-PINꢀTO-3

PACKAGEꢀSTYLEꢀCE

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DESCRIPTION

1"ꢅꢃ

The PA61 and PA61A are high output current operational

ampliﬁers designed to drive resistive, inductive and capaci-

tive 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 continu-

ous 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 reliabil-

ity, minimize size, and give top performance. Ultrasonically

bonded aluminum wires provide reliable interconnections at

all operating temperatures. The 8-pin TO-3 package is electri-

cally isolated and hermetically sealed. The use of compres-

sible thermal washers and/or improper mounting torque

voids the product warranty. Please see “General Operating

Considerations”.

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TYPICALꢀAPPLICATION

Due to its high current drive capability, PA61 applications

oftenutilizeremotesensingtocompensateIRdropsinthewir-

ing. The importance of remote sensing increases as accuracy

requirements, output currents, and distance between ampli-

ﬁer 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 R_F/R_INpair

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

powerreturnwiresareinsidethefeedbackloop. Therefore, as

long as the Power Op Amp has the voltage drive capability to

overcometheIRlosses, accuracyremainsthesame. Applica-

tion Note 7 presents a general discussion of PPS circuits.

EQUI5ALENTꢀSCHEMATIC

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Cirrus Logic, Inc.

NOV 2007

PA61Uꢀ ꢀ

ꢀ

http://www.cirrus.com

PA61U rev K

PA61 • PA61A

P r o d u c t I n n o v a t i o n F r o m

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

SUPPLY VOLTAGE, +V_Sto –V_S

90V

10A

97W

±37V

ABSOLUTEꢀMAXIMUMꢀRATINGS

OUTPUT CURRENT, within SOA

POWER DISSIPATION, internal

INPUT VOLTAGE, differential

INPUT VOLTAGE, common mode

TEMPERATURE, pin solder-10s

TEMPERATURE, junction¹

±V_S

300°C

200°C

TEMPERATURE RANGE, storage

OPERATING TEMPERATURE RANGE, case

–65 to +150°C

–55 to +125°C

SPECIFICATIONS

PA61

TYP

PA61A

TYP

PARAMETER

TEST CONDITIONS²

MIN

MAX

MIN

MAX

UNITS

INPUT

OFFSET VOLTAGE, initial

OFFSET VOLTAGE, vs. temperature

OFFSET VOLTAGE, vs. supply

OFFSET VOLTAGE, vs. power

BIAS CURRENT, initial

T = 25°C

±2

±10

±30

±20

±50

±10

±12

±50

200

±6

±65

±200

±1

±5

±4

±40

µV/°C

µV/V

µV/W

pA/°C

pA/V

pA/°C

MΩ

S^Cpeciﬁed temperature range

T = 25°C

T^C= 25°C

±500

BIAS CURRENT, vs. temperature

BIAS CURRENT, vs. supply

OFFSET CURRENT, initial

OFFSET CURRENT, vs. temperature

INPUT IMPEDANCE, DC

S^Cpeciﬁed temperature range

T = 25°C

T^C= 25°C

±30

±10

S^Cpeciﬁed temperature range

T = 25°C

INPUT CAPACITANCE

T^C= 25°C

COMMON MODE VOLTAGE RANGE³

COMMON MODE REJECTION, DC³

S^Cpeciﬁed temperature range

Speciﬁed temperature range

±V_S–5 ±V_S–3

100

GAIN

OPEN LOOP GAIN at 10Hz

Full temp. range, full load

108

MHz

kHz

GAIN BANDWIDTH PRODUCT at 1MHz T = 25°C, full load

POWER BANDWIDTH

PHASE MARGIN

T^C_C= 25°C, I_O= 8A, V_O= 40V_PP

Full temperature range

OUTPUT

VOLTAGE SWING³

CURRENT

T = 25°C, I_O= 10A

Fu^Cll temp. range, I = 4A

Full temp. range, I_O^O= 68mA

T = 25°C

±V –7 ±V –5

±V_S–6

±V^S–6 ±V_S^S–4

±V^S_S–5

±10

SETTLING TIME to .1%

SLEW RATE

CAPACITIVE LOAD, unit gain

CAPACITIVE LOAD, gain>4

T^C= 25°C, 2V step

T^C= 25°C, R_L= 6Ω

Fu^Cll temperature range

Full temperature range

µs

V/µs

1.0

2.8

1.5

SOA

POWER SUPPLY

VOLTAGE

CURRENT, quiescent

Full temperature range

T_C= 25°C

±10

±32

±45

THERMAL

RESISTANCE, AC, junction to case⁴

RESISTANCE, DC, junction to case

RESISTANCE, junction to air

TEMPERATURE RANGE, case

F > 60Hz

F < 60Hz

1.0

1.5

1.2

1.8

°C/W

°C

Meets full range speciﬁcation

–25

+85

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. +V and –V_Sdenote the positive and negative supply rail respectively. Total V is measured from +V_Sto –V_S.

4. Ra^Sting applies if the output current alternates between both output transistors^Sat a rate faster than 60Hz.

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.

ꢀ CAUTION

ꢂꢀ

ꢀ

ꢀꢀPA61U

PA61 • PA61A

P r o d u c t I n n o v a t i o n F r o m

TYPICAL PERFORMANCE

GRAPHS

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PA61Uꢀ ꢀ

ꢀ

PA61 • PA61A

P r o d u c t I n n o v a t i o n F r o m

OPERATING

CONSIDERATIONS

GENERAL

Please read Application Note 1 "General Operating Con-

siderations" which covers stability, supplies, heat sinking,

mounting, current limit, SOA interpretation, and speciﬁcation

interpretation. Visit www.apexmicrotech.com for design tools

that help automate tasks such as calculations for stability, in-

ternal power dissipation, current limit and heat sink selection.

The "Application Notes" and "Technical Seminar" sections

containawealthofinformationonspeciﬁctypesofapplications.

Package outlines, heat sinks, mounting hardware and other

accessories are located in the "Packages and Accessories"

section. Evaluation Kits are available for most Apex product

models, consult the "Evaluation Kit" section for details. For

the most current version of all Apex product data sheets, visit

www.apexmicrotech.com.

1. Under transient conditions, capacitive and dynamic* induc-

tive loads up to the following maximum are safe:

CAPACITIVE LOAD INDUCTIVE LOAD

V_S

I_LIM= 5A

200 F

400 F

800 F

1600 F

5.0mF

10mF

20mF

I_LIM= 10A

I_LIM= 5A

8mH

I_LIM= 10A

2.8mH

4.3mH

5.0mH

6.2mH

15mH

45V

40V

35V

30V

25V

20V

15V

150 F

200 F

400 F

800 F

2.5mF

5.0mF

10mF

11mH

20mH

35mH

50mH

400mH

20mH

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 I_LIM= 10A or 15V below the supply rail with

I_LIM= 5A while the ampliﬁer is current limiting, the inductor

should be capacitively coupled or the current limit must be

lowered to meet SOA criteria.

SAFEꢀOPERATINGꢀAREAꢀ(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

simultaneouscollectorcurrentandcollector-emittervoltage

exceeds speciﬁed limits.

** Second breakdown effect imposes no limitation but thermal

limitations must still be observed.

2. The ampliﬁer can handle any EMF generating or reactive

loadandshortcircuitstothesupplyrailorshortstocommon

if the current limits are set as follows at T_C=85°C.

3. The junction temperature of the output transistors.

SHORT TO V_S±

C, L, OR EMF LOAD

SHORT TO

COMMON

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40V

35V

30V

25V

20V

15V

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0.1A

0.2A

0.3A

0.5A

1.2A

1.5A

2.0A

1.3A

1.5A

1.6A

2.0A

2.4A

3.0A

4.0A

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Thesesimpliﬁedlimitsmaybeexceededwithfurtheranalysis

using the operating conditions for a speciﬁc application.

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3. The output stage is protected against transient ﬂyback.

However,forprotectionagainstsustained,highenergyﬂyback,

external fast-recovery diodes should be used.

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TheSOAcurvescombinetheeffectofalllimitsforthisPower

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 analyti-

cal efforts.

±ꢀ

ꢀ

ꢀꢀPA61U

PA61 • PA61A

P r o d u c t I n n o v a t i o n F r o m

Printed in the USA

Cirrus Logic, Inc. and its subsidiaries (“Cirrus”) believe that the information

contained is this document is accurate and reliable. However, the information is

subjecttochangewithoutnoticeandisprovided‘asis’withoutwarrantyofanykind

(expressorimplied).Customersareadvisedtoobtainthelatestversionofrelevant

information to verify, before placing orders, that information being relied upon is

currentandcomplete. Allproductsaresoldsubjecttothetermsandconditionsof

sales supplied at the time of order acknowledgement, including those pertain-

ing to warranty, indemniﬁcation, and limitation of liability. No responsibility is

assumed by Cirrus for the use of this information, 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. No part of this publication may be copied,

reproduced, stored in a retrieval system, or transmitted, in any for or by any

means (electronic, mechanical, photographic, or otherwise) unless distributed

in its entirety with all copyright notices attached. No part of this publication

may be used as a basis for manufacture or sale of any items without the prior

written consent of Cirrus. Certain applications using semiconductor products

may involve potential risks of death, personal injury, or severe property or en-

vironmental 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 of merchantability and ﬁtness for particular purpose, with regard to any

Cirrus product that is used in such a manner. If the customer uses or permits

the use of Cirrus products in critical products in critical applications, customer

agrees, by such use, to fully indemnify Cirrus, its ofﬁcers, directors, employ-

ees, 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, the Cirrus Logic logo designs, Apex, and Apex Precision

Power 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.

CIRRUS LOGIC, INC. • 5980 N SHANNON ROAD, TUCSON, AZ 85741 USA • TELEPHONE (520) 690-8600

APPLICATIONS SUPPORT (800) 546-2739 • FAX (520) 888-3329 • EMAIL support@cirrus.com

ORDERS (520) 690-8601 • FAX (520) 690-7749 • EMAIL teamsales@cirrus.com

PA61Uꢀ ꢀ

ꢀ

PA61 [CIRRUS]

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