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Tektronix

COMMITTED

TO

EXCELLENCE

PS

503A

DUAL

POWER

SUPPLY

INSTRUCTION

MANUAL

TEKTRO

NIX

®

■

PS

503A

DUAL

PO

WER

SUPPLY

INSTRUCTION

MANUAL

Tektronix,

Inc.

P.O.

Box

500

Beaverton,

Oregon

9 0

Serial

Number

_______________________

0 0-1834-01

First

Printing

SEPT

19 4

PS

503A

TABLE

O

CONTENTS

SECTION

1

SECTION

2

OPERATING

INSTRUCTIONS

SPECIFICATION

AND

PERFORMANCE

CHECK

Page

1-1

2-1

WARNING

|

The

remaining

portion

of

this

Table

of

Contents

lists

servicing

instructions

that

expose

personnel

to

hazardous

voltages.-

These

instructions

are

for

qualified

service

personnel

only.

SECTION

3

ADJUSTMENT

3-1

SECTION

4

MAINTENANCE

AND

INTERFACING

INFORMATION

4-1

SECTION

5

CIRCUIT

DESCRIPTION

'

5-1

SECTION

6

REPLACEABLE

ELECTRICAL

PARTS

LIST

6-1

OPTIONS

SECTION

DIAGRAM

AND

CIRCUIT

BOARD

ILLUSTRATION

-1

SECTION

8

REPLACEABLE

MECHANICAL

PARTS

LIST

AND

EXPLODED

VIEW

8-1

CHANGE

INFORMATION

i

Fig.

1-1.

PS

503A

Dual

Power

Supply

plug-in

module.

PS

503A

Section

1

—

PS

503A

OPERATING

INSTRUCTIONS

INTRODUCTION

Description

The

PS

503A

is

a

dual

0

to

20

V

d

c

constant-voltage,

current-limited,

floating

power

supply.

It

is

designed

to

operate

in

the

high-power

compartment

of

the

TM

504

or

TM

506

Power

Module.

In

the

high-power

compartment,

it

provides

a

floating

dual

0

to

20

Vdc

at

1.0

A.

Operating

in

a

standard

compartment

of

a

TM

500

Series

Power

Module,

the

PS

503A

supplies

a

floating

dual

0

to

20

V

d

c

at

400

mA.

The

supply

is

designed

for

conveniently

powering

complementary

and

linear

integrated

circuits

such

as

operational

and

differential

amplifiers

as

well

as

differen



tial

comparators.

A

ground

referenced

+5

V

auxiliary

supply

(suitable

for

bipolar

logic,

light-emitting

diodes,

incandescent

displays

and

similar

applications)

is

also

included.

With

the

floating

supply

available

for

powering

discrete

interface

circuits

and

level

shifting,

the

PS

503A

can

be

used

for

many

digital/analog

applications.

The

plus

and

minus

outputs

from

the

dual

floating

power

supplies

are

independently

variable

or^both

variable

at

a

constant

ratio

by

a

common

contro

l. Each

supply

provides

either

a

plus

or

minus

0

to

20

V

d

c

with

respect

to

the

common

terminal,

By

connecting

across

the

plus

and

minus

terminals,

the

PS

503A

can

provide

0

to

40

V

d

c

.

Either

terminal

may

be

grounded

or

floated

to

350

V

(de

+

peak

ac).

Each

supply

also

features

con



tinuously

variable

current

limiting

from

less

than

50

mA

to

400

mA

(standard

compartment)

or

1

A

(high

power

compartment)

at

both

20

V

and

40

V

output.

diode

as

well

as

a

dimming

of

the

VOLTS

indicator

light

if

the

supply

output

voltage

is

above

approximately

10

V.

These

functions

are

easily

verified

by

momentarily

shor



ting

the

output

of

the

supply.

Installation

and

Removal

CAUTION

(

Turn

the

power

module

off

before

inserting

the

plug



in;

otherwise,

damage

may

occur

to

the

plug-in

circuitry.

Because

of

the

high

current

drawn

by

the

PS

50 A,

it

Is

also

recommended

that

the

power

module

be

turned

off

before

removing

the

PS

50 A.

Refer

to

Fig.

1-2.

Check

to

see

that

the

plastic

barriers

on

the

interconnecting

jack

of

the

selected

power

module

compartment

match

the

cut-outs

in

the

PS

50 A

circuit

board

edge

connector.

A

li

gn

the

PS

503A

chassis

with

the

upper

and

lower

guides

of

the

selected

Compartment.

Push

the

module

in

and

press

firmly

to

seat

the

circuit

board

In

the

inter



connecting

jack.

To

remove

the

PS

503A,

pull

on

the

release

latch

located

in

the

lower

left

corner,

until

the

interconnecting

jack

disengages

and

the

PS

503A

will

slide

out.

The

presence

and

variability

of

the

output

voltage

is

verified

by

the

VOLTS

indicator

light

on

the

front

panel.

The

brightness

of

this

light

varies

with

output

voltage.

A

panel-mounted

light-emitting

diode

(LED)

indicates

when

the

PS

503A

is

operating

in

a

standard

compartment

of

a

TM

500

Series

Power

Module

and

the

output

current

is

limited

to

a

maximum

of

400

mA.

Other

panel-mounted,

light-emitting

diodes

indicate

when

either

the

+

or

—

supply

goes

into

current-limiting.

Hard

limiting

is

in



dicated

by

maximum

brightness

of

the

light-emitting

Controls

and

Connectors

Refer

to

Fig.

1-3.

Even

though

the

PS

503A

is

fully

calibrated

and

ready

to

use,

the

functions

and

actions

of

the

controls

and

connectors

should

be

reviewed

before

attempting

to

use

it.

Press

the

OUTPUT

button

to

apply

power

to

the

PS

503A.

REV.

C

MAR

1977

1-1

Operating

Instructions

—

PS

503A

ig.

1-2.

Plug-in

module

installatlon/removal.

/

OPERATING

CONSIDERATIONS

Overheating

The

PS

503A

is

designed

to

operate

at

an

ambient

temperature

from

0°C

to

+50"

C.

However,

when

operating

several

power

supplies

in

a

multi-

plug-in

power

module,

especially

at

low

output

voltages,

or

when

operating

close

to

other

heat-producing

equipment,

inter



nal

temperature

may

exceed

safe

limits

and

actuate

a

thermal

cutout

in

the

power

module.

Refer

to

the

power

module

instruction

manual

for

more

complete

informa



tion.

Grounded

and

loating

Operation

The

PS

503A

is

a

+

and

—

20

V

"floating"

supply

since

no

internal

connections

are

made

to

either

the

chassis

or

ground.

The

supply

can

thus

be

used

as

a

positive

or

negative

supply

by

simply

connecting

between

the

com



mon

and

the

negative

o

r

positive

output

terminal.

However,

there

may

be

undesirable

effects

caused

by

grounding

the

supply

to

the

chassis

while

the

load

is

grounded

at

some

point

removed

from

the

supply

chassis.

For

example,

if

a

remote

load

is

connected

as

shown

in

Fig.

1-5,

ground

currents

containing

the

power-line

frequency

could

result

and

create

excessive

noise

and

ripple

in

series

with

the

load.

Thus,

floating

operation

is

recommended

to

ensure

against

problems

caused

by

undersirable

ground

currents.

Load

and

Monitor

Connections

Improper

connections

between

the

power-supply

out



put

and

the

load

(s)

or

monitoring

device(s)

are

a

common

cause

of

errors.

Multiple

loads

or

monitoring

devices

must

be

connected

directly

to

the

output

terminals

with

separate

pairs

of

leads

as

shown

in

Fig.

1-4.

Avoid

using

clip

leads,

since

their

contact

resistance

can

exceed

the

output

impedance

of

the

PS

503A

and

cause

significant

measurement

error.

Reverse

Current

Loading

In

some

bias

supply

and

digital

circuitry

applications

the

load

might

behave

as

a

current

source

for

part

of

its

operating

cycle.

Since

the

output

circuit

of

a

series-

regulated

supply

is

unidirectional,

current

will

not

pass

in

the

opposite

direction

except

through

undesirable

paths.

The

internal

reverse-current

diodes

conduct

only

when

the

PS

503A

terminal

voltage

reverses

and

therefore

will

not

work

when

the

voltage

is

correctly

polarized.

Connec-

1-2

REV.

A

MAR

19

Operating

Instructions

—

PS

503A

VOLTS

DUAL

TRACKING

Control

VOLT:

CURRENT

LIMIT

VOLTS

Controls

and

Indicators

Variable

coarse

and

fine

controls

provide

con



tinuously

variable

+

or

—

voltage

selection

from

the

respective

0-20

volt

supply.

The

presence

and

variability

of

output

voltage

is

verified

by

voltage

indicator

lights

(OUTPUT

button

pressed).

Brightness

of

lights

varies

with

output

voltage.

400

mA

LIMIT

Indicator

Light

emitting

diode

in



dicates

when

PS

503A

Is

installed

in

a

standard

compartment

of

a

power

module,

limiting

the

current

output.

Floating

Output

Terminals

5-way

binding

post

ter



minals

that

provide

either

a

positive

0-20

volts

between

the

binding

post

on

the

right

(red)

and

COMMON,

or

a

negative

0-20

volts

between

the

binding

post

on

the

left

(green)

and

COMMON.

When

the

PS

503A

is

in



stalled

in

the

high

power

compartment

of

a

TM

504

or

TM

506

power

module

that

has

a

high

power

compartment,

the

current

available

at

either

the

+or

—

outputs

is

from

less

than

100

mA

to

at

least

1

A.

When

the

PS

503A

Is

installed

in

a

standard

compartment,

the

current

available

is

from

less

than

100

mA

to

at

least

400

mA.

0

to

40

volt

out



put

is

obtained

between

the

+

and

—

output

ter



minals.

+5

Ground-Referenced

Output

Terminals

5-way

binding-post

termi



nals

that

provide

a

ground-referenced

+5

V,

1

A,

fixed

output.

VOLTS

DUAL

TRACKING

(PULL)

When

pulled

out,

varies

both

the

+

and

—

outputs

from

0

volts

to

the

value

set

on

the

+

and

—

VOLTS

controls.

The

ratio

be



tween

the

+

and

-

outputs

is

maintained

throughout

the

range

of

the

VOLTS

DUAL

TRACKING

con



trol.

OUTPUT

Pushbutton

When

pressed,

applies

power

to

both

0-20V

binding

post

terminals

and

the

+5V

binding

post

terminal.

CURRENT

LIMIT

Controls

and

Indicators

Continuously

variable

controls

that

select

the

+

and

—

output

current

limit.

Light-emitting

diode

in



dicates

when

hard

limiting

occurs.

1834

’

05

REV.

B

MAR

19

Fig.

1-3.

PS

503A

controls

and

connectors.

Operating

Instructions

—

PS

503A

NOTE

Supply

is

connected

for

20

to

40

V

output.

ig.

1-4.

Monitor

and

load

connections.

NOTE

Supply

is

connected

for

0

to

40

V

output.

ig.

1-6.

Reverse

current

shunt

(Rs)

with

active

load.

ting

a

shunt

resistor

(Rs)

as

shown

in

Fig.1-6

provides

an

external,

reverse-current

path

to

the

power

supply

sources

or

delivers

current

only.

Over-voltage

The

PS

503A

is

protected

from

over-voltage

conditions

by

an

over-voltage

protection

circuit

that

shuts

down

the

power

supply

when

the

voltage

rises

to

about

26

V

d

c

.

NOTE

The

point

at

which

the

overvoltage

protection

blows

the

fuse

may

be

changed

for

specific

applications

by

changing

the

Zener

diode.

OPERATION

The

following

steps

demonstrate

the

use

of

the

PS

503A

controls

and

connectors.

1.

Install

the

PS

503A

into

(preferably)

the

high-power

compartment

of

the

power

module.

2.

Press

the

OUT

button

to

apply

power

to

the

PS

503A.

Observe

that

the

+

and

-

VOLTS

indicator

lights

come

on

(the

lights

will

be

very

dim

at

low

voltages).

Single

Supply

Operation

(±20

V

Maximum)

1.

Set

the

+

and

—

VOLTS

controls

for

approximately

2

V.

NOTE

Supply

is

connected

for

0

to

40

V

output.

2.

Turn

the

CURRENT

LIMIT

controls

fully

ccw

(to

protect

the

ammeter).

Connect

an

ammeter

between

the

common

terminal

and

the

+

or

—

terminal

and

adjust

the

appropriate

CURRENT

LIMIT

control

for

the

maximum

desired

current

output.

ig.

1-5.

Ground

loop

created

by

grounded

remote

lead.

1-4

REV.

A

MAR

1977

Operating

Instructions

—

PS

503A

3.

Remove

the

ammeter.

Connect

the

load

between

the

common

terminal

and

the

+

or

—

terminal.

Adjust

the

+

or

—

VOLTS

control

for

the

desired

output.

Combined

Supply

Operation

(40

V

Maximum)

1.

Set

the

+

and

—

VOLTS

control

for

approximately

2

V

and

turn

the

CURRENT

LIMIT

controls

fully

ccw

(to

protect

the

ammeter).

2.

Connect

an

ammeter

between

the

+

and

—

ter



minals.

First

adjust

one

CURRENT

LIMIT

control

for

the

maximum

desired

current

output;

then

adjust

the

other

CURRENT

LIMIT

control

until

the

CURRENT

LIMIT

indicator

just

reaches

maximum

brightness,

i.e.,

both

supplies

at

the

same

CURRENT

LIMIT

setting.

3.

Remove

the

ammeter.

Connect

the

load

between

the

+

and

-

terminals

and

set

the

+

and

—

VOLTS

controls

so

that

both

settings

added

together

equal

the

desired

output

voltage.

(See

Dual-Tracking

Operation

for

varying

the

output

with

the

VOLTS

DUAL

TRACKING

control.)

Stair-Step

Operation

The

PS

503A

can

be

operated

to

provide

a

"stair-step"

output

characteristic

by

choosing

certain

load

limits

and

control

settings.

For

example,

Fig.

1-

shows

the

stair-step

output

from

the

PS

503A

when

a

variable

load

(R

l

)

is

connected

between

the

+

and

—

output

terminals.

With

each

supply

set

for

maximum

voltage

and

current

(40

V,

1

A)

the

output

voltage

remains

constant

from

open

circuit

until

the

load

reaches

approximately

40

Ω

as

illustrated

by

the

solid

line

in

Fig.

1- .

At

this

crossover

point,

the

output

voltage

decreases

with

the

load

and

the

output

current

is

limited

at

1

A.

Therefore,

below

approximately

40

Ω

,

both

supplies

act

as

current

sources

with

output

voltage

variable

with

the

load.

Since

both

supplies

are

set

for

the

same

output

voltage,

each

supply

shares

equally

in

the

power

output

PR.

If

one

supply

is

set

for

a

lower

output

voltage

than

the

other,

output

power

is

shared

at

the

same

ratio

as

the

output

voltage.

Now,

by

setting

supply

E

2

for

a

current

limit

of

0.5

A

and

varying

the

load

over

the

same

range,

the

supplies

act

as

constant-voltage

sources

until

the

load

reaches

ap



proximately

80

Ω

.

At

that

crossover

point,

the

supply

set

for

0.5

A

(E

2

)

becomes

a

current

source

and

its

output

Dual-Tracking

Operation

When

pulled

out,

the

VOLTS

DUAL

TRACKING

control

varies

the

output

of

both

supplies

at

a

constant

ratio

from

zero

to

the

value

set

on

the

+

and

—

VOLTS

controls.

For

example,

if

the

+

and

—

VOLTS

controls

are

set

for

maximum

output

(approximately

20

V),

both

outputs

can

be

varied

from

zero

to

20

V

with

the

VOLTS

DUAL

TRACKING

control

(1:1

ratio).

Likewise,

if

one

supply

is

set

for

10

V

and

the

other

for

20

V,

each

1

V

change

in

the

10

V

output

will

be

matched

by

a

2

V

change

in

the

20

V

output

(2:1

ratio).

Note

also

that

no

matter

where

the

VOLTS

DUAL

TRACKING

control

is

set,

the

outputs

will

return

to

the

voltage

selected

by

the

+

and

—

VOLTS

control

when

the

VOLTS

DUAL

TRACKING

control

is

pushed

in.

Therefore,

rapid

selection

of

two

preset

outputs

from

each

supply

is

achieved

by

merely

switching

the

VOLTS

DUAL

TRACKING

control

in

or

out.

When

the

+

and

—

supplies

are

connected

as

described

under

Combined

Supply

Operation,

the

VOLTS

DUAL

TRACKING

control

will

vary

the

output

from

zero

to

the

value

selected

by

the

+

and

-

VOLTS

controls

added

together.

CURRENT

IN

AMPERES

ig.

1-7.

Output

characteristics

with

various

currents,

voltages,

and

loads.

REV.

B

MAR

19

1-5

Operating

Instructions

—

PS

503A

voltage

decreases

with

the

load.

At

approximately

40

Ω

and

20

V,

supply

E

2

no

longer

contributes

to

the

power

output.

Subsequently,

supply

Ei

supplies

all

the

output

power

and

operates

as

a

constant-voltage

source

with

output

current

variable

with

the

load.

Then,

at

ap



proximately

20

Ω

,

supply

Ei

crosses

over

and

becomes

a

current

source

at

its

maximum

output

of

1

A.

Thus,

by

choosing

the

appropriate

load

limits

and

control

settings,

any

of

the

four

operating

characteristics

is

possible.

A

second

stair-step

output

can

be

preselected

and

switched

in

or

out

with

the

VOLTS

DUAL

TRACKING

control

(see

Dual-Tracking

Operation

for

details

on

the

function

of

the

VOLTS

DUAL

TRACKING

control).

Parallel-Connected

Supplies

CAUTION

Parallel

operation

is

not

recommended

unless

a

forward

biased

diode

capable

of

handling

the

re



quired

current

and

voltage

is

inserted

between

each

power

supply

and

the

load.

Failure

to

do

this

may

cause

power

supply

damage.

The

outputs

of

two

or

more

PS

503's

can

be

connected

in

parallel

as

shown

in

Fig.

1-9

to

obtain

an

output

current

equal

to

the

sum

of

the

output

currents

from

each

supply.

Each

supply

must

be

adjusted

individually

to

obtain

the

desired

output

current.

Series-Connected

Supplies

The

outputs

of

two

or

more

PS

503A

’

s

can

be

con



nected

in

series

as

shown

in

Fig.

1-8

to

obtain

an

output

voltage

equal

to

the

sum

of

the

output

voltages

from

each

supply.

Each

supply

must

be

adjusted

individually

to

obtain

the

desired

output

voltage

(see

Dual-Tracking

Operation

for

varying

the

output

of

both

supplies

with

the

VOLTS

DUAL

TRACKING

control).

NOTE

The

PS

50 A

has

internal

diodes

connected

across

the

output

to

protect

the

series-connected

supplies

against

reverse

polarity

if

the

load

is

shorted,

or

one

of

the

supplies

is

not

on.

NOTE

The

+

and

—

supplies

are

internally

connected

in

series.

Therefore,

the

+

and

—

supplies

cannot

be

externally

connected

in

parallel

to

obtain

an

output

current

equal

to

the

sum

of

the

currents

from

each

supply.

One

supply

should

be

set

for

the

desired

output

voltage

and

the

other

for

a

slightly

higher

voltage.

The

supply

set

for

the

desired

voltage

will

then

become

a

constant

voltage

source,

while

the

supply

with

the

higher

voltage

output

becomes

a

current

source

(due

to

automatic

crossover),

which

results

in

their

output

voltage

decreasing

to

that

of

the

supply

with

the

lowest

output

voltage.

ig.

1-8.

Supplies

series-connected.

ig.

1-9.

Supplies

parallel-connected.

1-6

REV.

B

MAR

19