Linear Technology DC1238B Manual de usuario

dc1238bf

DEMO MANUAL DC1238B

DESCRIPTION

LTM8021

36V, 500mA Step-Down

µModule Regulator

Demonstration circuit 1238B features the LTM

8021, a

36V500mAstep-downμModule

regulator. The output has

been preset to 5V by a single resistor within the LTM8021’s

output voltage range of 0.8V to 5V. An adjustable soft-start

period may be implemented with the addition of a capaci-

tor at C3. The input voltage range is from 7.5V to 36V for

the default operating conditions. The LTM8021 may need

more input voltage to start up than to run in steady state. 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 data sheet gives a complete description of the part,

operation and applications information. The LTM8021 data

sheet must be read in conjunction with this demo manual

prior to working on or modifying demo circuit DC1238B.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

PARAMETER CONDITIONS VALUE

Input Voltage Range VOUT = 5V 7.5V to 36V

Output Voltage VIN = 12V, ILOAD = 500mA, R1 = 19.1k 5V ±3%

Maximum Continuous Output Current 500mA

Switching Frequency 1.1MHz

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dc1238bf

DEMO MANUAL DC1238B

QUICK START PROCEDURE

Demonstration circuit 1238 is an easy way to evaluate the

performance of the LTM8021. Refer to figure 1 for proper

measurement equipment setup and follow the procedure

below:

NOTE. When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. Measure the input or output voltage

ripple by touching the probe tip directly across the VIN or

VOUT and GND terminals. See Figure 2 for proper scope

probe technique.

1. Place JP1 on the ON position.

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

and GND.

3. Turn on the power at the input.

NOTE. Make sure that the input voltage does not exceed

the maximum rated input voltage of the LTM8021.

4. Check for the proper output voltage. VOUT = 5V ±3%

NOTE. If there is no output, temporarily disconnect the

load to make sure that the load is not set too high.

5. 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.

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dc1238bf

DEMO MANUAL DC1238B

Figure 2. Measuring Input or Output Voltage Ripple

Figure 1. Proper Measurement Equipment Setup

GND

VIN

dc1238b F02

QUICK START PROCEDURE

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dc1238bf

DEMO MANUAL DC1238B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 CAP., X5R, 4.7μF, 6.3V, 10%, 0603 AVX, 06036D475KAT2A

2 1 C1 CAP., X7R, 1μF, 50V, 10%, 0805 MURATA, GRM21BR71H105K

3 1 R1 RES., CHIP, 19.1k, 1/16W, 1% ,0402 VISHAY, CRCW040219K1FKED

4 1 R2 RES., CHIP, 0Ω, 1/16W, 1% ,0603 VISHAY, CRCW06030000Z0ED

5 1 R3 RES., CHIP, 51.1k 1/16W, 1% ,0603 VISHAY, CRCW060351K1FKED

6 1 U1 I.C., LTM8021EV#PBF, LGA, 15 PIN LINEAR TECH., LTM8021EV#PBF

Additional Demo Board Circuit Components

1 1 C4 CAP., SMT, 10μF, 50V SANYO, 50CE10BSS

2 0 C3, C5 (OPT) CAP., 0603

Hardware For Demo Board Only

1 1 E1, E3-E7 TESTPOINT, TURRET, 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 2MM SINGLE ROW HEADER, 3 PIN SAMTEC, TMM-103-02-L-S

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dc1238bf

DEMO MANUAL DC1238B

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

D D

C C

B B

A A

7.5V - 36V

OFF

5V / 500mA

* SEE QUICK START GUIDE

1. ALL RESISTORS ARE 0603.

ALL CAPACITORS ARE 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

0805

50V

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MOLLY Z.

PRODUCTION

14-9-121

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MOLLY Z.

PRODUCTION

14-9-121

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MOLLY Z.

PRODUCTION

14-9-121

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Wednesday, June 13, 2012

36V, 500mA STEP-DOWN DC/DC μMODULE

MOLLY Z.

N/A

LTM8021EV

DEMO CIRCUIT 1238B

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Wednesday, June 13, 2012

36V, 500mA STEP-DOWN DC/DC μMODULE

MOLLY Z.

N/A

LTM8021EV

DEMO CIRCUIT 1238B

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Wednesday, June 13, 2012

36V, 500mA STEP-DOWN DC/DC μMODULE

MOLLY Z.

N/A

LTM8021EV

DEMO CIRCUIT 1238B

(OPT)

1uF

1uF E4 VOUT

E4 VOUT

4.7uF

GND E7

GND

JP1JP1

E5 BIAS

51.1K

10uF

LTM8021EV

VIN

ADJ

RUN/SS

GND

GND G2

GND H1

GND H2

VOUT F3

VOUT F4

VOUT F5

VOUT G3

VOUT G4

VOUT G5

VOUT H4

VOUT H5

BIAS H3

E6 GND

VIN E1

VIN

RUN/SS E3

RUN/SS

(OPT)

19.1K

0402

19.1K

0402

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dc1238bf

DEMO MANUAL DC1238B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0612 • 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

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