International Rectifier IRU3038 Manual de usuario

IRDC3038

Rev. 1.2

06/05/02 www.irf.com

SPECIFICATION DATAINTRODUCTION

IRU3038EVALUATIONBOARDUSERGUIDE

INPUT/OUTPUT CONNECTIONS

The IRU3038 controller IC is designed to provide a low

cost synchronous Buck regulator for voltage tracking

applications such DDR memory and general purpose

on-boardDCtoDCconverter.Modernmicroprocessors

combinedwithDDRmemory,needhigh-speedbandwidth

databuswhichrequires a particular busterminationvolt-

age. This voltage will be tightly regulated to track the

halfofchipsetvoltage for best performance.

Switcher:

VIN = 5V

VOUT = 2.5V

IOUT = 8A

DVOUT = 75mV

FS = 200KHz

Thefollowing is theinput/output connections:

Inputs:

J1:Input(+5V)

J2:Gnd

Outputs:

J5: VOUT (+2.5V)

J6:Gnd

OtherConnections:

J7: VDDQ (for tracking system)

J3:VREF (outputforreferencevoltage)

TheconnectionpointsisshowninFigure1.Connectthe

power supply cables according to this figure, minimize

wire lengths to reduce losses in the wire. Test point J8

and J9 provide easy connections for oscilloscope volt-

age probe to monitor the output inductor point and the

outputvoltages.

IRDC3038

Rev. 1.2

06/05/02 www.irf.com

Figure1-Connectiondiagramofevaluation-boardforIRU3038.

CONNECTION DIAGRAM

Power Supply

Gnd+5V

6A Supply

Load

0 - 8A

IRDC3038

Rev. 1.2

06/05/02 www.irf.com

Thetopside (component) layer forIRU3038Evalboard

isshowninFigure2.Theinputcapacitorsare all located

close to the MOSFETs. All the decoupling capacitors,

charge pump capacitor and feedback components are

located close to IC. The feedback resistors are tied to

theoutput voltage atthe point ofregulation.

The PCB is 4-layers board, one layer is dedicated to

PowerGNDandtheanalogGNDiskeptseparatedfrom

the PGND and it is connected at a single point.

LAYOUT

Figure2-Top layer of evaluation-board for IRU3038.

IRDC3038

Rev. 1.2

06/05/02 www.irf.com

SCHEMATIC

Figure3-Schematicofevaluation-boardforIRU3038.

{Doc}

IRU3038EVAL

1Friday, May 24, 2002

Title

Size Document Number

Date: Sheet of

INPUT

+5V

GND

Vref

GND

VDDQ

Comp

Vrin

+5V

Vgl

Vgh

Vref

Vds

R3 0 Ohm

R5 0 Ohm

BAT54S 32

1L1

1uH

IRU3038

Vc 10

Vcc 4

Vref

13 Vp

Comp

12 Rt

HDrv 9

LDrv 6

PGnd 8

Gnd 7

0.1uF

C10

1uF

C1 33uF, ECS-T1CD336R

C17

OPEN

R10

OPEN

R8 1K

26.1K

C15

1800pF

C13

OPEN

C14

OPEN C16

OPEN

R4 OPEN

C8 0.1uF

0 Ohm

OPEN

C12

1uF

3.3uH, DO5022P-332HC

C9 470pF

J1 1

J2 1

J4 1

C11

2X150uF, 6TPC150M

R13

OPEN

J7 1

R12

OPEN

C7 OPEN

R11

1.00k

J3 1

C2 47uF

C6 1uF J9

TP14

TP1

C18

47uF, 16TPB47M

IRF7460

4.7Ohm

NOT USED

1 2

IRDC3038

Rev. 1.2

06/05/02 www.irf.com

BILL OF MATERIAL

Ref Desig Description Value Qty Part# Manuf Web site (www.)

Q1,Q2

C2,C18

C10,C11

C5,C8

C15

C3,C6,C12

R8,R11

R2,R3,R5

R1,4,7,

10,12,13

C7,12,13,

14,16

MOSFET

Controller

Diode

Inductor

Cap,Tantalum

Cap,Poscap

Cap,Ceramic

Resistor

Capacitor

Diode

IRF7460

IRU3038

BAT54S

D03316P-102HC

D05022P-332HC

ECS-T1CD336R

16TPB47M

6TPC150M

ECJ-2VF1E104Z

ECJ-3YB1E105K

ECJ-2VB1H182K

ECJ-2VB2D471K

ECJ-2VF1C105Z

Coilcraft

Panasonic

Sanyo

Panasonic

20V,10mV, 12A

SynchronousPWM

Fast Switching,

Schottky

1mH, 10A

3.3mH,12A

33mF, 16V

47mF, 16V, 70mV

150mF, 6.3V, 40mV

0.1mF, Y5V, 25V

1mF, X7R, 25V

1800pF, X7R, 50V

470pF,X7R

1mF, Y5V, 16V

26.1K, 5%

4.7V,5%

1K, 1%

NotUsed

irf.com

coilcraft.com

maco.panasonic.co.jp

sanyo.com/industrial

maco.panasonic.co.jp

IRDC3038

Rev. 1.2

06/05/02 www.irf.com

TEST DATA

Figure 16 - Start-up time @ IOUT=5A.

Figure17 - Shutdoownthe outputby

pullingdown the soft-start. Figure18 - 3.3Voutput voltage ripple @ IOUT=5A.

Figure 19 - Transient response @ IOUT=0 to 2A. Figure 20 - Transient response @ IOUT=0 to 4A.

Vss

VOUT

IOUT

VIN

Vss

VOUT

Figure15-Efficiencyfor IRU3038 Evaluation Board.

VIN=5V, VOUT=2.5V

0123456789

OutputCurrent (A)

Efficiency (%)

IRDC3038

Rev. 1.2

06/05/02 www.irf.com

IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105

TAC Fax: (310) 252-7903

Visit us at www.irf.com for sales contact information

Dataand specifications subjecttochange withoutnotice.7/25/2002

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