Datasheet > PA61_09

PA61_09

更新时间： 2024-11-18 09:53:27

品牌	Logo	应用领域
凌云 - CIRRUS		运算放大器
页数	文件大小	规格书
5页	196K
描述
Power Operational Amplifiers

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中文翻译

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数据手册

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PA61_09 数据手册

PA61 • PA61A

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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

R_F1

SENSE HI

+42V

R_CL+

OUT

R_W

±10V

DAC

R_IN1

R_IN2

DESCRIPTION

PA61

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”.

R_CL–

LOAD

R_F2

–42V

SENSE LO

RTN

R_W

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 ac-

curacy requirements, output currents, and distance between

ampliﬁer and load go up. The circuit above shows wire resis-

tance 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

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.Applica-

tion Note 7 presents a general discussion of PPS circuits.

EQUIVALENT SCHEMATIC

Q1A

Q1B

EXTERNAL CONNECTIONS

R_CL+

C_L+

+V_S

OUT

OUTPUT

+IN

TOP VIEW

R_CL–

–IN

Q6B

Q6A

C_L–

–V_S

N.C.

MAY 2009

APEX − PA61UREVL

PA61U

http://www.cirrus.com

12 3 4 5

中文翻译

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