Linear Technology DC1999A Guida rapida alla configurazione

dc1999af

DEMO MANUAL DC1999A

DESCRIPTION

LTC3111EDHD

15V, 1.5A Synchronous

Buck-Boost DC/DC Converter

Demonstration circuit 1999A is a fixed frequency syn-

chronous buck-boost converter with an extended input

and output range. The unique 4-switch, single inductor

architecture provides low noise and seamless operation

from input voltages above, below, or equal to the output

voltage.

The LT C

3111 features selectable PWM or Burst Mode

operation, and an easily synchronizable oscillator. Jumper

JP1 is provided to enable the converter. The demo board

is configured for 800kHz. A jumper, JP2, is provided to

select PWM, or Burst Mode operation. A clock signal can

also be applied to JP2 if synchronization is desired.

The LTC3111 operates with a 2.5V to 15V input voltage

range and a VOUT range from 2.5V to 15V. The demon-

stration board has been designed to operate with VIN

from 2.5V to 15V and an output current up to 1.5A. For

VIN < 5V, IOUT capability is reduced. VOUT is set to 5.0V.

L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks

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

owners.

PERFORMANCE SUMMARY

Typical demo board efficiency is shown in Figure 2 for

several loads. The demo board has the provision to set an

accuraterun threshold.Consultthe LTC3111datasheet for

more information. The transient response of the converter

to a 100mA to 600mA transient at input voltages of 3.5V

and 12V are presented in Figures 3 and 4.

The LTC3111 data sheet has detailed information about

the operation, specifications, and applications of the part.

The data sheet should be read in conjunction with this

Quick Start Guide.

Design files for this circuit board are available at

http://www.linear.com/demo

INPUT VOLTAGE RANGE 2.5V to 15V

VOUT 5V

IOUT 1.5A for VIN > 5V

Specifications are at TA= 25°C

dc1999af

DEMO MANUAL DC1999A

QUICK START PROCEDURE

Using short twisted-pair leads for any power connections

and with all loads and power supplies off, refer to Figure1

for the proper measurement and equipment setup. The

power supply should not be connected to the circuit until

told to do so in the procedure below.

When measuring the input or output voltage ripple, care

must be taken to avoid a long ground lead on the oscil-

loscope probe.

1. JP1, JP2 and Load Settings to start:

JP1 (RUN) = OFF

JP2 (PWM) = 800kHz (Fixed Frequency)

LOAD = 0.1A/50Ω 10W Resistor

2. With power OFF connect the power supply as shown in

Figure 1. If accurate current measurements are desired

(for efficiency calculations for example) then connect

an ammeter in series with the supply as shown. The

ammeter is not required however.

3. Connect the load to VOUT as shown in Figure 1. Again,

connect an ammeter if accurate current measurement

or monitoring is desired.

4. Turn on the power supply and slowly increase voltage

until the voltage at VIN is 2.5V. Move Jumper JP1 to

ON.

5. Verify VOUT is ~5.0V.

6. VIN can now be varied between 2.5V and 15.0V. VOUT

should remain in regulation.

7. IOUT can also be varied from 0A to 1.5A. For VIN < 5.0V,

maximum IOUT is reduced. This reduction is due to IIN

increasing as VIN decreases. Once the input current

limit is reached, VOUT will fall out of regulation.

Note: If VOUT drops out of regulation, check to be sure

the maximum load has not been exceeded, or that VIN is

not below the minimum value (2.5V).

Figure 1. Measurement Setup

dc1999af

DEMO MANUAL DC1999A

QUICK START PROCEDURE

Figure 2. Typical Efficiency as a Function of Input Voltage and Load Current

Figure 3. Typical Transient Load Response for a

100mA to 600mA Transient Load VIN = 3.5V

Figure 4. Typical Transient Load Response for a

100mA to 600mA Transient Load VIN = 12V

dc1999af

DEMO MANUAL DC1999A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 CAP CER 47µF 16V 20% X5R 1210 MURATA, GRM32ER61C476ME15L

2 3 C3, C10, C12 CAP CER 1µF 16V 10% X5R 0603 MURATA, GRM188R61C105KA93D

3 2 C4, C5 CAP CER 0.1µF 16V 10% X7R 0402 MURATA, GRM155R71C104KA88D

4 1 C6 CAP CER 22pF 50V 1% NP0 0402 MURATA, GJM1555C1H220FB01D

5 1 C7 CAP CER 1500pF 16V 10% 0402 AVX, 0402YC152KAT2A

6 1 C8 CAP CER 47pF 50V 5% NP0 0402 MURATA, GRM1555C1H470JZ01D

7 1 C9 CAP CER 100µF 16V 20% X5R 1210 TAIYO YUDEN, EMK325ABJ107MM-T

8 1 C11 CAP CER 100pF 50V 5% NP0 0402 MURATA, GRM1555C1H101JA01D

9 1 L1 INDUCTOR, 10µH COILCRAFT, XAL5050-103M

10 1 R1 RES 845k 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF8453X

11 1 R2 RES 158k 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF1583X

12 1 R3 RES 11.5k 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF1152X

13 1 R4 RES 41.2k 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF4122X

14 1 R5 RES 1.00M 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF1004X

15 1 R6 RES 0402 SMD (DNP)

16 1 R7 RES 49.9Ω 1/16W 1% 0402 SMD PANASONIC, ERJ-2RKF49R9X

17 1 U1 15V, 1.5A SYNCHRONOUS BUCK-BOOST DC/DC CONVERTER LINEAR TECH., LTC3111EDE #PBF

Additional Demo Board Circuit Components

1 0 C1 (OPT)CAP, TANT LOW ESR 47µF 35V 20% SMD AVX, TPSE476M035R0200

Hardware-For Demo Board Only

1 5 E1-E5 TURRET, 0.09 DIA MILL-MAX, 2501-2-00-80-00-00-07-0

3 2 JP1, JP2 JMP, 3-PIN 1 ROW 0.079CC SAMTEC, TMM-103-02-L-S

4 2 XJP1, XJP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

5 4 STAND OFF STAND-OFF, NYLON 0.375" TALL KEYSTONE, 8832 (SNAP ON)

dc1999af

DEMO MANUAL DC1999A

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

4 4

3 3

2 2

1 1

PWM

800kHz

BURST

OSC SYNC

1. ALL RESISTORS ARE IN

OHMS, 0402.

2. INSTALL SHUNTS

AS SHOWN.

NOTE: UNLESS

OTHERWISE

SPECIFIED

RUN

OFF

TANT

1210 0603 1210

0603

Vin > 5.0 V

VIN

VOUT

VCC

PWM/SYNC

VCC

PWM/SYNC

RUN

VIN

RUN

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

DEMO CIRCUIT 1999A

15V, 1.5A SYNCHRONOUS BUCK-BOOST DC / DC CONVERTER

N/A LTC3111EDE

2 - 6 - 14

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

DEMO CIRCUIT 1999A

15V, 1.5A SYNCHRONOUS BUCK-BOOST DC / DC CONVERTER

N/A LTC3111EDE

2 - 6 - 14

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

DEMO CIRCUIT 1999A

15V, 1.5A SYNCHRONOUS BUCK-BOOST DC / DC CONVERTER

N/A LTC3111EDE

2 - 6 - 14

GND

C10

1uF

C10

1uF

1500pF

VOUT

5.0V / 1.5A

VOUT

5.0V / 1.5A

C11

100pF

C11

100pF

11.5K

GND

OPT

0.1uF

JP2JP2

C12

1uF

C12

1uF

100uF

16V

100uF

16V

845k

JP1JP1

C6 22pFC6 22pF

47pF

47uF

16V

47uF

16V

41.2K

DNP

0.1uF

158K

VIN

2.5V - 15.0V

VIN

2.5V - 15.0V

10uH

LTC3111EDE

SW1

NC 11

BST1

SGND 14

VIN

VCC

PWM/SYNC

RUN

SW2 9

SNSGND

BST2 8

VOUT 10

COMP 1

FB 2

GND

1uF

49.9

dc1999af

DEMO MANUAL DC1999A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0214 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,

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

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC1999A

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