HP A Series Manuel de service

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MODULAR

POWER

SUPPLIES

A,

C,

AND

E

SERIES

MODELS

62003A-62048A,

62003C-62048C,

AND

62003E-62048E

OPERATING

AND

SERVICE

MANUAL

FOR

SERIALS

1210A-00101

AND

ABOVE*

^For

Serials

Above

1210A-00101,

a

change

page

may

be

included.

Hewlett-Packard

HP

Part

No.

5950-5969

Printed;

May,

1972

SECTION

1

GENERAL

INFORMATION

1-1

DESCRIPTION

1-2

Hewlett-Packard

modular

power

supplies

are

completely

solid-state,

employing

high-reiiability

tran¬

sistors

and

integrated

circuits.

The

power

supplies

are

packaged

in

three

uniform

height

and

depth

cases

that

are

fractions

of

the

standard

19-inch

rack

width.

The

supplies

can

be

bench-operated

or

rack-mounted

indi¬

vidually

or

in

any

combination

to

full

rack

width

or

less.

The

modular

power

supplies

are

of

the

Constant

Voltage/Current

Limiting

type,

furnishing

fuli-rated

output

voltage

at

the

maximum

rated

output

current.

The

output

voltage

can

be

adjusted

between

±0.5

V

or

±5%

(whichever

is

greater)

of

nominal

while

providing

full-rated

output

current.

The

supply

and

load

are

fully

protected

from

current

overloads

by

a

self-restor¬

ing

current

cutback

circuit

that

causes

the

output

current

to

cutback

linearly

from

approximately

103%

to

approximately

10%

of

rated

output

as

the

load

varies

from

slightly

above

the

maximum

rated

value

to

a

complete

short

circuit.

The

current

limit

(cutback)

activation

point

is

adjustable

anywhere

between

the

103%

and

10%

limits.

1-3

Either

the

positive

or

negative

output

terminal

may

be

grounded

at

the

rear

terminals.

1-4

SCOPE

1-5

This

manual

provides

installation

procedures,

operating

instructions,

principles,of

operation,

main¬

tenance

data,

and

replaceable

parts

information

for

the

thirty-three

Hewlett-Packard

modular

power

supplies

listed

in

the

following

chart.

Note

that

the

last

two

digits

in

the

model

number

indicate

the

nominal

out¬

put

voltage

of

the

supply.

The

-A

suffix

supplies

are

1/8-rack

width

units

while

the

-C

and

-E

models

are

1/4-rack

width

units.

1-6

SCHEMATICS

1-7

The

modular

power

supplies

covered

in

this

manual

are

of

similar

design

differing

mainly

in

com¬

ponent

values

rather

than

in

circuit

operation.

Hence,

in

general,

the

information

presented

in

the

manual

applies

to

all

of

the

power

supply

models

with

any

significant

differences

among

the

supplies

described

as

applicable.

Thus,

the

schematic

diagrams

at

the

rear

of

the

manual

depict

groups

of

similar

supplies

with

five

DC

OUTPUT

MODEL

NOMINAL

VOLTAGE

(Minimum

Adj.

Span)

CURRENT

AT50“C

3V

(±0.5V}

2A

62003A

4.25A

62003C

8.5A

62003E

4V(±0.5V)

2A

62004A

4A

62004C

8A

62004E

5V

(±0.5V)

2A

62005A

4A

62005C

8A

62005E

6V

(±0.5V)

1.75A

62006A

3.75A

62006C

7.5A

62006E

10V

(±0.5V)

1.5A

6201OA

3.25A

62010C

6.5A

62010E

12V

(±0.60V)

1.5A

62012A

3.0A

62012C

6.0A

62012E

15V

(±0.75V)

1.25A

62015A

2.SA

62015C

5.0A

62015E

18V{±0.90V)

1.0A

62018A

2.25A

62018C

4.5A

62018E

24V

(±

1.20V)

.75A

62024A

1.75A

62024C

3.75A

62024E

28V

(±

1.40V)

.7A

62028A

1.5A

62028C

3.25A

62028E

48V(±2.40V)

.45A

.62048A

1.0A

62048C

2.0A

62048E

1-1

schematics

provided

to

illustrate

all

33

models.

Each

schematic,

of

course,

identifies

the

supplies

for

which

it

applies

and

includes

notes

and

tables

to

identify

the

difference

{mainly

in

component

values)

among

the

supplies

illustrated

in

the

common

schematic.

1-8

SPECIFICATIONS

1-9

Detailed

specifications

for

the

power

supplies

are

given

in

Table

1-1.

Table

T1.

Specifications

INPUT:

115Vac

±10%,

single

phase,

48-63

Hz.

See

Options

101,

102,

and

103.

OUTPUT:

See

Paragraph

1-5.

LOAD

REGULATION;

Less

than

0.01

%

or

1

mV

whichever

is

greater

for

a

full

load

to

no

load

change

in

output

current.

LINE

REGULATION:

Less

than

0.01

%

or

1

mV

whichever

is

greater

for

a

10%

change

in

the

specified

input

voltage.

RIPPLE

AND

NOISE:

Less

than

1

mV

rms

and

2

mV

p-p

(up

to

20

MHz).

TEMPERATURE

RANGES;

Operating:

0

to

50“C

ambient.

Output

current

de¬

rated

linearly

for

temperatures

greater

than

50°

with

50%

of

maximum

output

current

at

71°C

ambient.

Storage:

~55°C

to

+85“C

Cooling:

Convection

cooled.

TEMPERATURE

COEFFICIENT:

Less

than

0.01%

output

voltage

change

per

degree

Centigrade

over

the

operating

range

from

0

to

50

C

after

30

minutes

warmup.

THERMAL

PROTECTION:

Heat

sink

mounted

thermostat

opens

ac

line

if

supply

overheats

due

to

high

ambient

temperature.

Thermostat

automatically

closes

(reset)

when

temper¬

ature

cools

to

safe

operating

level.

STABILITY:

Less

than

0.1%

total

drift

for

8

hours

after

an

initial

warm-up

time

of

30

minutes

at

constant

ambient,

con¬

stant

line

voltage,

and

constant

load.

TRANSIENT

RECOVERY

TIME:

Less

than

50

jusec

for

output

recovery

to

within

15

mV

of

nominal

output

voltage

following

a

load

change

from

full

to

half

load

(or

vice

versa)._

OVERLOAD

PROTECTION:

A

current

limit

circuit

cuts

back

current

linearly

to

approximately

10%

of

rated

output

current

when

supply

is

short-circuited.

Automatically

resets

when

overload

removed.

Current

limit

activation

point

adjustable

(screwdriver

control)

but

preset

at

factory

to

activate

at

104

±1%

of

maximum

rated

output

current

at

nominal

output

voltage.

OUTPUT

CONTROL:

Screwdriver

adjustment

accessible

through

hole

in

front

panel.

Minimum

adjustment

range

is

±0.5

V

or

±5%,

whichever

is

greater.

ERROR

SENSING:

Error

sensing

normally

accomplished

locally

at

rear

terminals.

Provision

included

at

rear

terminal

strip

for

remote

sensing

with

correction

for

load

lead

voltage

drops

of

up

to

0.5

V

total.

Load

protected

if

sensing

terminals

inadvertently

opened.

MOUNTING:

Three

mounting

surfaces

provided

for

mounting

in

the

upright

position.

For

mounting

orientations

other

than

upright,

adequate

cooling

is

required.

See

Section

II.

DIMENSIONS;

A—

suffix

models:

1.91"

W

x

5.03"

H

x

12.25

D

'

(48

mm

W

x

128mm

H

x

311mm

D)

C-

Si

E

™

suffix

models;

3.94"

W

x

5.03"

H

12.25"

D

(100

mm

W

X

128mm

H

x

311mm

D)

WEIGHT

(net/shipping):

A—

suffix

Models:

6

lbs

(2,

7

kg)/8

lbs

(3,

6

kg)

C-

suffix

Models:

10

lbs

(4,

5

kg)/12

lbs

(5,

4

kg)

E-

suffix

Models:

ii

lbs

(5,9

kg)/16

lbs

(7,

3

kg)

1-10

OPTIONS

103

T11

Options

are

factory

modifications

of

a

standard

instrument

that

are

requested

by

the

customer.

The

following

options

are

available

for

the

instruments

covered

by

this

manual.

Where

necessary,

detailed

cover¬

age

of

the

options

are

included

in

the

manual.

OPTION

NO.

DESCRIPTION

011

Overvoltage

Protection

"Crow¬

bar":

A

completely

separate

circuit

for

protecting

delicate

loads

against

power

supply

failure

or

operator

error.

The

crowbar

circuit

monitors

the

output

voltage

and

within

10

Msec

imposes

a

virtual

short-circuit

(conducting

SCR

or

triac)

across

the

power

supply

output

if

the

preset

overvoltage

margin

is

exceeded.

The

crowbar

circuit

is

contained

on

a

printed

wiring

board

that

is

mounted

inside

the

power

supply.

The

activa¬

tion

(trip)

voltage

of

the

crowbar

is

adjustable

(screwdriver

adjustment)

over

the

following

minimum

range:

from

-i-0.5

Vdc

above

minimum

rated

output

voltage

to

+2

Vdc

above

maxi¬

mum

rated

output

voltage.

101

220

Vac,

single

phase

input:

Supply

is

normally

shipped

with

a

120

Vac

(nominal)

transformer.

Option

101

replaces

this

transformer

with

a

220

Vac

(nominal)

transformer

and

allows

operation

from

a

190-233

Vac,

48-63

Hz

single

phase

input.

102

240

Vac,

single

phase

input:

Supply

is

normally

shipped

with

a

120

Vac

(nominal)

transformer.

Option

102

replaces

this

transformer

with

a

240

Vac

(nominal)

transformer

and

allows

operation

from

a

208-254

Vac,

48-63

Hz,

single

phase

input,

120

Vac/240

Vac,

single

phase

in¬

put:

Supply

is

normally

shipped

with

a

120

Vac

(nominal)

transformer.

Option

103

replaces

this

transformer

with

a

120

Vac/240

Vac

(nominal)

multi-tap

transformer

and

allows

field-

changeable

operation

from

104-127

Vac

or

208-254

Vac,

48-63

Hz

single

phase

input.

104

System

Control:

This

option

allows

the

user

to

control

the

supply's

over¬

voltage

protection

"crowbar"

circuit

as

well

as

output

voltage.

The

104

option

includes

the

same

internal,

ad¬

justable

overvoltage

protection

crow¬

bar

as

provided

with

the

011

option.

In

addition,

the

104

option

crowbar

includes

external

(from

a

rear

term¬

inal

strip)

pulse

control

capability

that

allows

the

crowbar

to

be

either

externally

triggered

or

which

provides

an

output

pulse

to

indicate

that

the

crowbar

has

triggered.

The

crowbar

pulse

specifications

are:

Input

Trigger

Pulse:

Voltage:

8

—

15

V

Width

(between

90%

point

at

leading

edge

and

10%

point

at

falling

edge);

5

jusec

—

2

msec

Output

Pulse:

Voltage;

2

-

12

V

Width

(between

90%

point

at

leading

edge

and

10%

point

at

falling

edge):

2

—

20Msec

Load

Impedance;

1

Kii

(min.)

In

addition

to

the

crowbar

trigger

external

access,

the

104

option

also

includes

access

(from

a

rear

terminal

strip)

to

the

summing

point

of

the

supply

to

enable

the

dc

output

volt¬

age

to

be

remotely

programmed

to

zero

(±15

mVdc

max.)

with

a

contact

closure.

1-3

1-13

The

accessories

listed

below

may

be

ordered

with

the

power

supply

or

separately

from

your

local

Hewlett-

Packard

field

sales

office

(refer

to

list

at

rear

of

manual

for

addresses).

HP

Part

No.

Description

62410A

Rack

Mounting

Tray

for

mounting

any

combination

of

supplies.

19”

wide,

5'1/4”

high,

and

17”

deep.

(Refer

to

Section

II

for

details.)

62411A

Rack

Tray

Blank

Front

Panel,

10-1/2"

wide,

5-3/16"

high,

1/8"

thick.

62412A

Rack

Tray

Blank

Rear

Panel,

mounts

on

rear

of

rack

mounting

tray

and

allows

installation

of

custom

input/

output

connectors

or

other

hardware.

62415A

Rack

Tray

AC

Distribution

Panel

mounts

on

rear

of

rack

mounting

tray

and

includes

ac

input

terminal

strip

and

line

card.

62414A

Rack

Tray

Slides

provide

easy

access

to

rack

mounting

tray

and

its

supplies.

62413A

Rack

Mounting

Tray

Cooling

Unit

provides

forced

air

cooling

of

rack¬

mounted

supplies.

1-15

Hewlett-Packard

power

supplies

are

identified

by

a

two-part

serial

number.

The

first

part

is

the

serial

number

prefix,

a

number-letter

combination

that

de¬

notes

the

date

of

a

significant

design

change

and

the

country

of

manufacture.

The

first

two

digits

indicate

the

year

(10=

1970,

11

=1971,

etc.),

the

second

two

digits

indicate

the

week,

and

the

letter

"A”

designates

the

U.S.A.

as

the

country

of

manufacture.

The

second

part

is

the

power

supply

serial

number;

a

different

sequential

number

Is

assigned

to

each

power

supply,

starting

with

00101.

1-16

If

the

serial

number

on

your

instrument

does

not

agree

with

those

on

the

title

page

of

the

manual.

Change

Sheets

supplied

with

the

manual

or

Manual

Backdating

Changes

define

the

differences

between

your

instrument

and

the

instrument

described

by

this

manual.

M7

ORDERING

ADDITIONAL

MANUALS

1-18

One

manual

is

shipped

with

each

power

supply.

Additional

manuals

may

be

purchased

from

your

local

Hewlett-Packard

field

office

(see

list

at

rear

of

this

manual

for

addresses).

Specify

the

model

number,

serial

number

prefix,

and

HP

Part

number

provided

on

the

title

page.

INITIAL

INSPECTION

NOTE

2-2

Before

shipment,

this

instrument

was

inspected

and

found

to

be

free

of

mechanical

and

electrical

de¬

fects.

As

soon

as

the

instrument

Is

unpacked,

inspect

for

any

damage

that

may

have

occurred

in

transit.

Save

all

packing

materials

until

the

inspection

is

completed.

If

damage

is

found,

a

claim

should

be

filed

with

the

carrier

immediately.

Also,

a

Hewlett-Packard

Sales

and

Service

office

should

be

notified.

2-3

i\flechanica!

Check

2-4

This

check

should

confirm

that

there

are

no

broken

connectors

and

that

the

panel

surfaces

are

free

of

dents

and

scratches.

2-5

Electrical

Check

2-6

The

instrument

should

be

checked

against

its

electrical

specifications.

Section

V

includes

an

"in-cab-

inet”

performance

check

to

verify

proper

instrument

operation,

2-7.

INSTALLATION

DATA

2-8

The

instrument

is

shipped

ready

for

bench

oper¬

ation.

It

is

necessary

only

to

connect

the

instrument

to

a

source

of

power

and

it

is

ready

for

operation.

2-9

Location

2-10

This

instrument

is

air

cooled.

Sufficient

space

should

be

allotted

so

that

a

free

flow

of

cooling

air

can

reach

the

instrument

when

it

is

in

operation.

At

least

1/2-inch

clearance

at

the

bottom

of

the

unit

is

recom¬

mended

to

permit

proper

air

flow.

The

supply

should

be

used

in

an

area

where

the

ambient

temperature

does

not

exceed

50°C.

If

operated

at

an

ambient

greater

than

50°C,

the

supply's

output

current

must

be

linearly

de¬

rated

down

to

50%

at

71°C.

If

the

power

supply

must

be

operated

in

a

restricted

air

flow

environment,

the

supply's

power

consumption

(and

heat

dissipation

requirements)

can

be

minimized

by

oper¬

ating

at

low

tine

input

voltage.

Consult

your

nearest

HP

sales

engineer

for

more

infor¬

mation

on

the

cooling

requirements

for

your

specific

operation

2-11

Mounting

Orientation

2-12

Figure

2-1

shows

outline

and

dimension

infor¬

mation

for

each

modular

power

supply

size.

As

shown,

holes

are

provided

on

three

surfaces

of

the

supplies

any

of

which

can

be

used

to

install

the

supply

in

the

up¬

right

position.

If

the

top

mounting

holes

are

used;

how¬

ever.

be

sure

that

a

rigid

top

support

is

employed

to

support

the

weight

of

the

unit{s).

Note

that

if

any

other

orientation

other

than

upright

is

required,

adequate

air

flow

must

be

provided;

see

your

nearest

HP

sales

engi¬

neer

for

additional

information.

2-13

Rack

Mounting

2-14

The

modular

power

supplies

can

be

readily

mounted

in

any

combination

in

a

standard

19-inch

rack

using

the

Hewlett-Packard

Rack

Mounting

Tray,

Model

62410A.

The

supplies

are

mounted

upright

and

attached

to

the

tray

using

the

two

(A—

suffix

models)

or

four

{C—

and

E—

suffix

models)

10-32

threaded

mounting

holes

located

in

the

bottom

of

the

supply

case.

The

maximum

number

of

supplies

that

can

be

mounted

in

the

tray

depends

on

the

types

of

supplies

used.

For

example,

if

all

1/8-width

{A-

suffix)

supplies

are

employed,

eight

modular

power

supplies

can

be

mounted

in

the

tray.

Of

course,

the

tray

does

not

have

to

be

filled

to

capacity.

4MTG.

HOLES

_

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THREADED

INSERTS

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(1/8

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THREADED

INSERTS

(TOP

a

BOTTOM

COVERS)

ca

£-

SUFFIX

MODELS

(1/4-WIDTH

PACKAGE)

Figure

2-1.

Outline

Diagrams,

Modular

Power

Supplies

2-2

2-15

INPUT

POWER

REQUIREMENTS

2-16

The

modular

power

supplies

may

be

operated

from

a

nominal

120

Vac,

220

Vac,

or

240

Vac,

48-63

Hz,

power

source.

The

standard

supply

(no

options)

is

shipped

from

the

factory

wired

for

120

Vac

(nominal)

operation

and

requires

the

following

maxi¬

mum

input

current

and

power

at

high

line

(127

Vac)

voltage

input:

AC

INPUT

at

127

Vac

MODEL

CURRENT

(Max.)

POWER

(Max.)

62003A

.30A

31W

62003C

.77A

74W

62003E

1.38A

143W

62004A

.33A

34W

62004C

.78A

76W

62004E

1.42A

149W

62005A

.37A

37W

62005C

.80A

79W

62005E

1.53A

160W

62006A

.36A

37W

62006C

.80A

79W

62006E

1.56A

161W

6201OA

.39A

39W

62010C

.98A

97W

62010E

1.87A

192W

52012A

.47A

47W

62012C

1.00A

100W

62012E

1.89A

191W

62015A

.45A

46W

62015C

.99A

97W

62015E

1.82A

181W

62018A

.42A

42W

62018C

.97A

95W

62018E

1.93A

196W

62024A

.39A

39W

62024C

.93A

88W

62024E

1.95A

198W

62028A

.44A

44W

62028C

.91

A

86W

62028E

1.87A

190W

62048A

.47

A

47W

62048C

.97A

95W

62048E

2.00A

193W

2-17

220/240

VOLT

OPERATION

2-18

As

applicable,

Options

101,102,

and

103

(in¬

stalled

at

the

factory)

permit

the

supply

to

be

operated

from

a

120,

220,

or

240

Vac

(nominal)

input

line.

Option

101

provides

for

220

Vac

operation

while

Option

102

allows

240

Vac

operation.

Option

103,

however,

provides

for

either

120

Vac

or

240

Vac

oper¬

ation

at

the

selection

of

the

user

as

described

below.

2-19

Option

103

Power

Transformer

Connections,

A—

suffix

Models.

For

the

A-

suffix

models,

the

pri¬

mary

connections

of

the

supply

are

changed

at

the

in¬

board

side

of

the

rear

power

input

terminals.

For

120

Vac

operation

(as

shipped),

two

leads

are

soldered

from

each

of

the

ac

input

terminals

as

shown

in

Figure

2-2B.

To

connect

the

supply

for

240

Vac

oper¬

ation,

unsolder

the

wht/bik/yel

and

wht/blk/grn

leads

and

twist

them

together

with

a

wire

terminal

as

shown

in

Figure

2-2A.

Figure

2-2.

Primary

Connections

For

120/240

Vac

Operation

(Option

103)

—

A

Suffix

Models

Only

2-20

Option

103

Power

Transformer

Connections,

-C

and

E-

Suffix

Models.

For

the

C-

and

E-

suffix

models,

the

appropriate

power

transformer

120/240

V

terminals

must

be

connected

as

shown

in

Figure

2-3.

Notice

that

the

transformer

connections

are

changed

at

the

transformer

terminals

shown

in

the

illustration.

2-3

2-21

REPACKAGING

FOR

SHIPMENT

A

INPUT

POWER

TRANSFORMER

(T!)

PRIMARY

CONNECTIONS

FOR

240V

OPERATION

B

INPUT

POWER

TRANSFORMER

(Tl>

primary

CONNECTIONS

FOR

120V

OPERATION

Figure

2-3.

Primary

Connections

For

120/240

Vac

Operation

(option

103)

-C

and

-E

Suffix

Models

Only

2-22

To

insure

safe

shipment

of

the

instrument,

it

is

recommended

that

the

package

designed

for

the

instru¬

ment

be

used.

The

original

packaging

material

is

re¬

usable.

If

it

is

not

available,

contact

your

local

Hewlett-

Packard

field

office

to

obtain

the

materials.

This

office

will

also

furnish

the

address

of

the

nearest

service

office

to

which

the

instrument

can

be

shipped.

Be

sure

to

attach

a

tag

to

the

instrument

which

specifies

the

owner,

model

number,

full

serial

number,

and

service

required,

or

a

brief

description

of

the

trouble.

2-4

3-1

TURN-ON

CHECKOUT

PROCEDURE

3-2

The

following

checkout

procedure

describes

the

use

of

the

voltage

control

and

ensures

that

the

supply

is

operational.

a.

Before

connecting

input

power

to

unit,

connect

external

voltmeter

across

+S

and

—S

terminals

at

rear

terminal

board.

b.

Connect

unit

to

input

power

source

using

AC,

ACC.

and

ground

terminals

at

rear.

(Use

proper

wire

size

in

accordance

with

the

input

AC

current

rating.)

c.

Observe

output

voltage

of

supply

on

external

meter.

Output

is

factory

set

to

nominal

voltage.

If

de¬

sired.

VOLTAGE

ADJUST

(screwdriver

control,

ac¬

cessible

through

cutout

on

front

panel)

potentiometer

can

be

used

to

set

output

to

any

voltage

within

adjust¬

ment

span

(±0.5

V

or

±5%

as

applicable).

NOTE

The

current

limit

may

require

readjust¬

ment

if

the

output

voltage

is

set

away

from

nominai.

Refer

to

Paragraph

3-8.

d.

To

verify

operation

of

current

limit

circuit,

remove

voltmeter

and

disconnect

input

power.

Connect

short

across

output

terminals

of

supply

and

reconnect

input

power.

Using

clip-on

milliammeter

(HP

Model

428B,

or

equivalent)

observe

that

short

circuit

output

current

is

approxi

mately

3%

to

15%

of

rated

output

current.

e.

Remove

short

and

milliammeter.

Before

con¬

necting

actual

load

to

supply,

read

the

following

para¬

graphs.

3-3

OPERATION

3-4

The

supply

can

be

operated

in

one

of

two

oper¬

ating

modes;

normal

or

remote

sensing.

Auto-Series,

Auto-Parallel,

Auto-Tracking

and

remote

programming

operation

are

not

feasible

with

this

supply.

The

follow¬

ing

paragraphs

describe

both

of

those

modes

plus

supplementary

operating

information.

More

theoreti¬

cal

descriptions

regarding

the

operational

features

of

power

supplies

in

general

are

given

in

application

note

90A,

DC

Power

Supply

Handbook

(available

at

no

charge

from

your

local

HP

sales

office).

3-5

Normal

Operating

Mode

3-6

The

power

supply

is

shipped

with

the

rear

term¬

inal

straps

connected

for

Constant

Voltage/Current

Limiting,

local

sensing,

operation.

This

strapping

pattern

is

illustrated

in

Figure

3-1.

Before

connecting

a

load

to

the

supply,

check

the

rear

terminals

to

ensure

that

the

connections

are

correct

and

that

the

connect¬

ing

straps

are

tightened

securely.

3-7

Current

Limit

3-8

Figure

3-2

shows

typical

current

limiting

charac¬

teristics

for

all

HP

modular

supplies.

As

indicated

on

the

drawing,

the

current

limit

point

varies

in

accord¬

ance

with

the

output

voltage.

As

received

from

the

factory,

the

initial

current

limit

point

is

set

to

104

±1

%

of

the

current

rating

with

the

output

voltage

at

its

nominal

value.

This

same

current

limit

setting

is

recom¬

mended

for

ail

output

voltages

within

the

adjustment

span

because:

(1)

the

current

limit

crossover

point

must

be

at

least

3%

higher

than

the

maximum

expected

operating

current

to

prevent

performance

degradation;

and

(2)

a

current

limit

setting

of

higher

than

105%

of

rating

creates

the

possibility

of

excessive

internal

heat¬

ing

as

specified

in

the

caution

note

of

Figure

3-2.

Hence,

the

current

limit

potentiometer

(accessible

through

a