DC823B-A - ANALOG DEVICES

dc823baf

DEMO MANUAL DC823B-A

DESCRIPTION

LTM4600:

20V, 10A Step-Down Power

µModule

Regulator

Demonstration circuit DC823B-A features the

LT M

4600EV, a 10A high efficiency, high density switch

mode step-down power module. The input voltage is from

4.5V to 20V. The output voltage is programmable from

0.6V to 5V. The rated load current is 10A, while derating is

necessary for different VIN, VOUT, and thermal conditions.

Integrated input and output filters enable a simple PCB

layout. Only bulk input and output capacitors are needed.

L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of

Linear Technology Corporation. All other trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

BOARD PHOTO

The LTM4600 data sheet must be read in conjunction with

this demo manual prior to working on or modifying demo

circuit DC823B-A.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA = 25°C)

PARAMETER TEST CONDITION VALUE

Input Voltage Range 4.5V to 20V

Output Voltage VOUT Selectable with Jumpers (Open for 0.6V) 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V

Maximum Continuous Output Current 5V to 20VIN, 1.5VOUT 10 ADC

Efficiency VIN = 12V, VOUT = 1.5V, IOUT = 10A 82%, See Figure 2

dc823baf

DEMO MANUAL DC823B-A

QUICK START PROCEDURE

Figure 1. Test Set-Up of DC823B-A (EXTVCC VBIAS Supply is Optional)

Demonstration circuit DC823B-A is an easy way to evalu-

ate the performance of the LTM4600EV. Refer to Figure 1

for proper measurement equipment set-up and follow the

procedure below:

1. Place jumpers in the following positions for a typical

1.5VOUT application:

FCB RUN/SS VOUT Select

CCM ON 1.5V

2. With power off, connect the input power supply,

load, optional 5V bias supply and meters as shown in

Figure 1. Preset the load to 0A and VIN supply to be less

than 20V. The optional 5V bias supply applied to the

EXTVCC pin must be off while the main VIN is turned off.

3. Turn on the power at the input. The output voltage

should be 1.5V ± 2%.

4. Once the proper output voltage is established, adjust the

load within the operating range and observe the output

voltage regulation, ripple voltage, efficiency and other

parameters. Output voltage ripple should be measured

at J6 with a BNC cable.

5. For optional load transient test, apply an adjustable

pulse signal between IOSTEP CLK and GND pins.

Pulse amplitude sets the current step. The pulse signal

should have very small duty cycle (<15%) to limit the

thermal stress of the transient load circuit. The output

transient current can be monitored at BNC connector

J5 (10mV/A).

–

+–

LOAD

0A TO 10A

–

+–

–

dc823ba FO1

dc823baf

DEMO MANUAL DC823B-A

Figure 2. Measured Supply Efficiencies with Different VIN and VOUT

QUICK START PROCEDURE

Figure 3. Measured Load Transient Response (0A to 10A Step)

Efficiency vs Load Current with

5VIN (FCB = 0)

Efficiency vs Load Current with

12VIN (FCB = 0)

LOAD CURRENT (A)

EFFICIENCY (%)

6 8 10

100

42 12

0.6VOUT

1.2VOUT

1.5VOUT

2.5VOUT

dc823bb F02a LOAD CURRENT (A)

100

EFFICIENCY (%)

6 8 10

dc823bb F02b

42 12

0.6VOUT

1.2VOUT

1.5VOUT

2.5VOUT

3.3VOUT

VIN = 12V

VOUT = 1.5V

FCB = 0

0A TO 10A LOAD STEP

COUT = 2 × 100µF/X5R/1210

332mVP-P

IOUT

(5A/DIV)

VOUT

(200mV/DIV)

dc823ba F03

dc823baf

DEMO MANUAL DC823B-A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, 150µF 20% 35V ALUM SANYO 35MV150WXV (now SUNCON 35ME150WXV)

2 2 C5, C2 CAP, 1206 10µF 20% 25V X5R TDK C3216X5R1E106MT

3 2 C7, C8 CAP, 1812 100µF 20% 6.3V X5R TDK C4532X5R0J107M

4 1 C10 CAP, 1206 22µF 20% 6.3V X5R TAIYO YUDEN JMK316BJ226ML-T

5 1 C12 CAP, 0603 100pF 10% 50V X7R AVX 06035C101KAT1A

6 1 R1 RES, 0603 49.9k 1% 1/10W AAC CR16-4992FM

7 1 R8 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA

8 1 U1 IC, LTM4600EV LINEAR TECHNOLOGY LTM4600EV

Additional Demo Board Circuit Components

1 0 C4, C3 CAP, 1206 OPTION TAIYO YUDEN EMK316BJ475ML-T OPTION

2 0 C8 CAP, 1812 OPTION TAIYO YUDEN JMK432BJ107MU-T OPTION

3 0 C11, C14, C18,

C19

CAP, 0603 OPTION OPTION

4 1 C13 CAP, 0603 100pF 10% 50V NPO AVX 06035A101KAT

5 2 C15, C16 CAP, 0603 1µF 20% 10V X5R TAIYO YUDEN LMK107BJ105MA-T

6 0 C17 CAP, 0805 1µF 20% 16V X5R OPTION TAIYO YUDEN EMK212BJ105MG-T

7 1 D1 DIODE, ZENER 4.7V DIODES INC. BZX84C4V7-7-F

8 1 Q14 XSTR, SUD50N03-10CP MOSFET SILICONIX SUD50N03-10CP-E3

9 1 R2 RES, 0603 66.5k 1% 1/10W AAC CR16-6652FM

R2 - ALTERNATE RES, 0603 66.5k 1% 1/10W VISHAY CRCW06036652F

10 1 R3 RES, 0603 31.6k 1% 1/10W AAC CR16-3162FM

R3 - ALTERNATE RES, 0603 31.6k 1% 1/10W PANASONIC ERJ-3EKF3162V

11 1 R4 RES, 0603 22.1k 1% 1/10W AAC CR16-2212FM

12 1 R5 RES, 0603 13.7k 1% 1/10W AAC CR16-1372FM

13 3 R6, R10, R12 RES, 0603 10k 5% 1/10W VISHAY CRCW060310K0JNEA

R6, R10,

R12- ALTERNATE

RES, 0603 10k 5% 1/10W PANASONIC ERJ-3GEY512V

14 1 R7 RES, 0603 5.1k 5% 1/10W AAC CR16-512JM

15 1 R9 RES, 0603 1MΩ 5% 1/16W AAC CR16-105JM

16 1 R11 RES, 2512 0.01Ω 5% 1W IRC LRF2512-01-R010-J

17 0 R13 RES, 0603 OPTION OPTION

18 1 R14 RES, 0603 100k 1% 1/10W AAC CR16-1003FM

Hardware

1 6 JP0 TO JP5 HEADER, 2-PIN, 2mm COMM CON 2802S-02G2

2 2 JP6, JP7 HEADER, 3-PIN, 2mm COMM CON 2802S-03G2

3 4 J1, J2, J3, J4 JACK, BANANA KEYSTONE 575-4

4 2 J5, J6 CONN, BNC, 5 PINS CONNEX 112404

5 14 TP1 TO TP14 TURRET MILL-MAX 2501-2-00-80-00-00-07-0

6 3 JP3, JP6, JP7 SHUNT SAMTEC 2SN-BK-G

7 4 STANDOFF, SNAP ON KEYSTONE_8831

dc823baf

DEMO MANUAL DC823B-A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

SCHEMATIC DIAGRAM

DCM

CCM

VIN

GND

VIN+

VIN-

EXTVCC

SVIN

FADJ

VOSET

FCB

PWRGD

SGND

IOSTEP

CLK

VO+

VOUT

GND

VO-

RUN/SS

JUMPER VOUT

JP0

JP1

JP2

JP3

JP4

JP5

1.2V

1.5V

1.8V

2.5V

3.3V

VO+

OFF

RUN/SS

FCB

IOSTEP

5V-20V

0.6V-5V/10A

(VOS RTN)

COMP

3.3V

1.2V

1.5V

2.5V 5V1.8V

VOUT SEL

DC823B-A

Thursday, October 06, 2005

Custom

SCH, LTM4600EV HIGH EFFICIENCY DC/DC MODULE

823B-1.DSNNONE

MEI 08/04/04

SIZE

SCALE:

CAGE CODE DWG NO REV

SHEET OF

FILENAME:

TITLE

CONTRACT NO.

APPROVALS DATE

DRAWN

CHECKED

APPROVED

ENGINEER

DESIGNER

UNLESS OTHERWISE SPECIFIED

DIMENSIONS ARE IN INCHES

TOLERANCE ON ANGLE - - -

2 PLACES - - - 3 PLACES - - -

INTERPRET DIM AND TOL

PER ASME Y14.5M -1994

THIRD ANGLE PROJECTION

DO NOT SCALE DRAWING

TECHNOLOGY

1630 McCarthy Blvd.

Milpitas, CA 95035

Phone: (408)432-1900

Fax: (408)434-0507

PROD1 05/27/05

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

VIN

VOUT

RUN

EXTVCC

SVIN

PWRGD

FADJ

VOSET

VOUT

COMP

FCB

VIN

C17 OPT

1 2

R13 OPT

1 2

C18

OPT

1 2

R14

100K

TP13

TP10

TP14

TP6

OPT

JP1

R11

0.01

C15

1uF

1 2

TP1

TP7

JP0

R12

10K

1 2

TP11

TP9

49.9K

TP8

1 2

LTM4600EV

A11

A13

C10

C12

C14

E14

E12

E10

D23

H11

H13

H15

H17

K11

K13

K15

K17

L10

L12

L14

L16

L18

L20

L22

M10

M12

M14

M16

M18

M20

M22

N10

N12

N14

N16

N18

N20

N22

P22

P20

P18

P16

P14

P12

P10

R22

R20

R18

R16

R14

R12

R10

T22

T20

T18

T16

T14

T12

T10

A19

A17

A15

A21

B23

G23

J23

F23

VIN

SGND

PGND

VOUT

EXTVCC

SVIN

FADJ

VOSET

COMP

FCB

PGOOD

RUN/SS

C13

100pF

C16

1uF

1 2

C12 100pF

TP2

100uF

C11 OPT

1 2

150uF

10uF

66.5K

31.6K

1 2

JP4

10uF

TP4

TP12

1 2

OPT

22.1K

1 2

OPT

10K

1 2

C14

OPT

1 2

100uF

R10

10K

1 2

4.7V

1 3

C19 OPT

1 2

JP6

JP2

Q14

JP3

TP5

C10

22uF

6.3V

JP7

TP3

JP5

5.1K

1 2

13.7K

1 2

dc823baf

DEMO MANUAL DC823B-A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2011

LT 0111 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035