电源管理芯片MAX1631,1632资料电路图

19-1211;

Rev

0; 3/97

MAX1630/MAX1631/MAX1632

Evaluation

Kits

_______________General

Description

The

MAX1630/MAX1631/MAX1632

evaluation

kits

(EV

kits)

each

consist

of

one

of

three

preassembled

and

tested

evaluation

boards

(EV

boards)

that

embody

the

standard

application

circuits.

The

MAX1630

and

MAX1632

EV

boards

provide

the triple-output

3.3V/5V/

12V

circuit,

and

the

MAX1631

EV

board

provides

the dual-output

3.3V/5V

circuit.

All

three

use

the

same

PC

board

but

have

different

components

to

accommodate

different

input

voltage

ranges.

The

main

differences

between

the

MAX1630

and

MAX1632

EV

boards

are

in

the

turns

ratio

(1:4

or

1:2.2)

and

in the location of the transformer connection

(3.3V

side

or

5V

side).

Connecting

the

transformer

to

the

3.3V

side

allows

lower

input

voltage.

Connecting

the

transformer

to

the

5V

side

provides

slightly

better

efficiency

and

lower

stress voltages.

These

circuits

are

configured

to deliver

up

to 3A of out-

put

current

on

each

of

the

main

PWM

outputs

with

greater

than

90%

efficiency.

The

MAX1630/MAX1631/ MAX1632

EV

kits

can

also

be

used

to

evaluate

other output voltages.

___________________________ _Featur

es

?

Battery Range:

5.2V to 20V (MAX1630)

5.2V to 28V (MAX1631)

6.5V to 28V (MAX1632)

?

Outputs:

3.3V at 3A

12V at 120mA

5V at 3A

5V at 30mA Keep- Alive

?

1:4 Transformer (MAX1630)

1:2.2 Transformer (MAX1632)

?

Adjustable 2.5V to 5.5V Outputs (optional resistor

divider)

?

Precision 2.5V Reference Output

?

Oscillator Sync Input

?

Low-Noise Mode Control Input (

SKIP

)

?

Power-Good Monitor (

RESET

output)

?

Fully Assembled and Tested

______________Or

dering

Information

PART

MAX1630

EVKIT-SO

MAX1631

EVKIT-SO

MAX1632

EVKIT-SO

TEMP.

RANGE

0°

C

to

+70°

C

0°

C

to

+70°

C

0°

C

to

+70°

C

BOARD

TYPE

Surface

Mount

Surface

Mount

Surface

Mount

_______________ _________________Components

Common

to

All

Thr

ee

EV

Kits

DESIGNATION

QTY

C1,

C7,

C21,

C22,

C25

DESCRIPTION

DESIGNATION

QTY

DESCRIPTION

100mA,

30V

dual

Schottky

diode

Central

Semiconductor

CMPSH-3A

200mA,

75V

dual

diode

Central

Semiconductor

CMPD2838

N-channel

MOSFETs

International

Rectifier

IRF7413

or

Siliconix

Si4410DY

2M

?

,

5%

resistors

0.020

?

,

1%

resistors

Dale

WSL-2010-R020-F

or

IRC LR2010-01-R020-F

5

5

4

1

2

3

1

0

0.1?

F

ceramic

capacitors

220?

F, 10V,

low- ESR

tantalum

caps

Sprague

594D227X0010D2T

or

595D227X0010R2T

10?

F, 30V

electrolytic

capacitors

Sanyo OS-CON 30SC10M

4.7?

F, 25V

ceramic

capacitor

United

Chemicon/Marcon

THCR40E1E475Z

4.7?

F, 16V

tantalum

capacitors

Sprague

595D475X0016A2B

0.01?

F

ceramic

capacitors

0.22?

F

ceramic

capacitor

Open

4.7?

F, 35V

tantalum

capacitor

Sprague

595D475X0035C2B

or

5950475X0035B2B

1A,

40V

Schottky

diodes

Nihon

EC10QS04

or

Motorola

MBRS140T3

D3

D6

N1

–

N4

R1

–

R4

1

1

4

4

C2,

C3,

C12,

C13,

C20

C5,

C6,

C15,

C16

C8

C9,

C14

C10,

C18,

C23

C17

C19

R5,

R8

R6,

R7,

R10

–

R13,

< br>R15

–

R18

R9

R14

R19

SW1

2

0

1

1

1

1

Open

1k

?

,

5%

resistor

100k

?

,

5%

resistor

10

?

,

5%

resistor

DIP-8

dip

switch

MAX1630/MAX1631/MAX1632

PC

board

C24

1

D1,

D5,

D7,

4

D8

None

1

Maxim

Integrated

Products

1

For

free

samples

&

the

latest

literature:

,

or

phone

1-800-998-8800

MAX1630/MAX1631/MAX1632

Evaluation

Kits

MAX1630

EV

Kit

Additional

Components

DESCRIPTION

2.2

?

F,

25V

tantalum

capacitor

Sprague

595D225X0025B2B

Open

1A,

100V,

fast- recovery

diode

Nihon

EC11FS1

or

Motorola

MBRS1100T3

Open

C4

C11

C4,

C11

D2,

D4

JU1,

JU3

–

JU6

JU5

JU10,

JU11

MAX1631

EV

Kit

Additional

Components

DESCRIPTION

Open

Open

2-pin

headers

Shunt

Short

10

?

H

power

inductors

Sumida

CDRH125-100

(shielded)

or

Coiltronics

UP2-100

or

Coilcraft

DO3316P-103

MAX1631 (SSOP-28)

Maxim

MAX1631CAI

0

0

5

1

2

DESIGNATION

QTY

1

0

DESIGNATION

QTY

D2

D4

1

0

JU1,

JU3

–

JU6,

JU8,

JU10,

8

JU11

JU5

1

L1,

L2

2

2-pin

headers

Shunt

10

?

H

power

inductor

Sumida

CDRH125-100

(shielded)

or

Coiltronics

UP2-100

or

Coilcraft

DO3316P-103

10

?

H,

1:4

transformer

Transpower

Technologies

TTI-5902

MAX1630 (SSOP-28)

Maxim

MAX1630CAI

U1

1

L2

1

SUPPLIER*

AVX

Central

Semiconductor

Coilcraft

Coiltronics

Dale- Vishay

International

Rectifier

IRC

Motorola

Nihon

Sanyo

Siliconix

Sprague

Sprague/Sanyo

Sumida

Vishay/Vitramon

Transpower

Technologies

Component

Suppliers

PHONE

(803)

946-0690

(516)

435-1110

(847)

639-6400

(561)

241-7876

(402)

564-3131

(310)

322-3331

(512)

992-7900

(602)

303-5454

(805)

867-2555

(619)

661-6835

(408)

988-8000

(603)

224-1961

(207)

324-4140

(847)

956-0666

(203)

268-6261

(702)

831-0140

T1

U1

1

1

FAX

(803)

626-3123

(516)

435-1824

(847)

639-1469

(561)

241-9339

(402)

563-6418

(310)

322-3332

(512)

992-3377

(602)

994-6430

(805)

867-2698

(619)

661-1055

(408)

970-3950

(603)

224-1430

(207)

324-7223

(847)

956-0702

(203)

452-5670

(702)

831-3521

DESIGNATION

QTY

C4

0

C11

1

D4

1

L1

1

T2

1

MAX1632

EV

Kit

Additional

Components

DESCRIPTION

Open

2.2

?

F,

25V

tantalum

capacitor

Sprague

595D225X0025B2B

1A,

100V,

fast- recovery

diode

Nihon

EC11FS1

or

Motorola

MBRS1100T3

10

?

H

power

inductor

Sumida

CDRH125-100

(shielded)

or

Coiltronics

UP2-100

or

Coilcraft

DO3316P-103

10

?

H,

1:2.2

transformer

Transpower

Technologies

TTI-5870

JU1,

JU3

–

JU6,

JU8,

JU10,

8

JU11

JU5

1

2-pin

headers

Shunt

MAX1632 (SSOP-28)

Maxim

MAX1632CAI

*

Note:

Please

indicate

that

you

are

using

the

MAX1630/

MAX1631/MAX1632

when

contacting

these

component

suppliers.

U1

1

2

MAX1630/MAX1631/MAX1632

Evaluation

Kits

Quick

Star

t

The

MAX1630/MAX1631/MAX1632

EV

kits

are

fully

assembled

and

tested.

Follow

these

steps

to

verify

board

operation.

Do

not

turn

on

the

power

supply until all connections are completed.

1)

Connect

a

bench

power

supply

(50W

or

better)

to

the

VIN

and

GND

pads

at the

edge

of the

board.

2)

Connect voltmeters

and

loads (if any) to the

VOUT

pads.

3)

Verify

that

switch

SW1

positions

SHDN

,

ON5,

and

ON3 are on,

and

that the shunt is across JU5.

4)

Turn

on the power

supply

and

verify that the output

voltages are

3.3V

and

5V.

Detailed

Description

Output

Voltage

The

main output voltages come preset to

3.3V

and

5V.

Install

resistors

R6/R7

and

R12/R13

for

adjustable mode.

Two

small

PC

trace

jumpers,

JU9

and

JU7,

shunt

FB3

and

FB5

to

GND

on

the

board.

These

default

jumpers

must

be

cut

for

adjustable- mode

operation.

Refer

to

the

MAX1630

–

data

sheet

for

instructions

on

calculating

R6/R7

and

R12/R13.

Do

not

operate

the

circuit

without

a

jumper

or

resistor-

divider

installed,

or

output

overvoltage

will

damage

the IC.

In

addition

to

the

standard

components,

the

extra

pull-

up

and

pull-down resistors listed below are used to set

logic

input

levels.

These

resistors

can

usually

be

omit-

ted

in the final

design.

R6,

R7

Adjustable-mode

resistor- divider

(not

in- stalled).

V

OUT

=

2.5V

(1

+

R6

/

R7).

R12,

R13

Adjustable-mode

resistor- divider

(not

in- stalled).

V

OUT

=

2.5V

(1

+

R12

/

R13).

R1

–

R4

2M

?

logic

pull-down

resistors.

Shorted

out or driven

by

logic.

R14

100k

?

SYNC

pull- up

resistor (usually short

ed

out).

SYNC

to

VL.

Jumper

Selection

The

three

2-pin

headers

JU3,

JU4,

and

JU5

select

the

power- up

sequence

mode.

Table

1

lists

the

selectable

jumper options.

The

2-pin header JU6 selects the operating frequency.

Table 2 lists the selectable jumper options.

The

EV

kit’s

components

are

selected

for

300kHz

operation.

C

omponent

values

might

need

to

be

changed

if

200kHz

operation

is

selected

(refer

to

the

Design

Procedure

section

in

the

MAX1630

–

MAX1635

data

sheet).

Synchronize

the

oscillator

to

an

external

clock

signal

by

driving

the

SYNC

pad

with

a

pulse

train

of

5V

amplitude

in

the

240kHz

to

350kHz

frequency range.

Table

1.

Jumper

JU3,

JU4,

JU5

Functions

SHUNT

LOCATION

SEQ

PIN

POWER-UP

SEQUENCE

JU3

Connected

to GND

5V

before

3.3V

JU4

Connected

to

VL

3.3V

before

5V

JU5

Connected

to

REF

Separate ON3/ON5

controls

Table

2.

Jumper

JU6

Functions

SHUNT

JU6

FREQUENCY

LOCATION

SYNC

PIN

(kHz)

On

Connected

to

GND

200

Off

Connected

to

VL

300

Additional

Jumpers

(MAX1631

Only)

Additional

jumpers

on

the

board

along

with

R10

and

R11

are

for

configuring

the

MAX1631

for

an

auxiliary

secondary

output.

R10

and

R11

set

the

secondary

feedback

voltage

(refer

to

the

MAX1630

–

< br>MAX1635

data sheet). Table 3 lists the

MAX1631

jumper settings.

Table

3.

MAX1631

Jumper

Settings

JUMPER

FUNCTION

JU1

Connects

the

secondary

feedback

to

R10

and

R11.

JU2

Used

connections.

in

MAX1630

and

MAX1632

for

normal

JU8

Steers

secondary

feedback

to

the

3.3V

SMPS.

JU10

Steers

secondary

feedback

to

the

5V

SMPS.

JU11

Disables

secondary

feedback.

3