Linear Technology DC1821B Manuale utente

dc1821bf

DEMO MANUAL DC1821B

DESCRIPTION

LTC3114EDHC-1

40V, 1A Synchronous Buck-Boost DC/DC

Converter with Output Current Limit

Demonstration circuit 1821B features the LT C

3114-1, a

wide operating range synchronous monolithic buck-boost

converter with programmable average output current.

The DC1821B demo board has two user selectable operat-

ing modes: Burst Mode

operation and Fixed Frequency

PWM (JP2). There is also an accurate programmable RUN

pin which is used to ENABLE the converter (JP1).

The LTC3114-1 uses average current mode control to

simplify voltage loop compensation and provide good line

and load transient response.

The DC1821B operates with a 2.7V to 40V input volt-

age range. The demo board has been designed with the

output voltage set to 5V. The LTC3114-1 incorporates a

proprietary low noise switching algorithm which optimizes

efficiency with input voltages above, below or equal to the

output voltage and ensures seamless transitions between

operating modes.

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.

In PWM mode, the LTC3114-1 operates at 1.2MHz to

optimize small size with high efficiency operation.

The demo board also incorporates diode D1 to backfeed

VCC to improve efficiency in some applications. If the

demo board output voltage is changed to a higher volt-

age, D1 should be removed. Consult the data sheet for

more information.

Figure 1 shows typical demo board efficiency. Figure 2

shows the response to an input voltage step while Figure 3

shows the load step response.

The LTC3114-1 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/DC1821B

PARAMETER TYP

Input Voltage Range 2.7V to 40V

VOUT 5V

IOUT (See Note 1) 1A for VIN > 6V

Efficiency See Figure 1

NOTE 1: The demo board output current is a function of VIN. Please refer to the data sheet for more information.

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

dc1821bf

DEMO MANUAL DC1821B

Figure 2. DC1821B Input Voltage Step Response. VIN Stepped from 3.3V to 12V IOUT is 500mA

Figure 3. DC1821B Step Load Response. VIN = 12V Load Step is from 250mA to 750mA

DESCRIPTION

dc1821a F02

VOUT: 500mV/DIV

VIN: 5V/DIV

dc1821a F03

VOUT: 100mV/DIV

IOUT: 500mA/DIV

Figure 1. DC1821B Efficiency in Auto Burst Mode Operation

DC1821B Typical Efficiency in

Auto Burst Mode Operation

VIN (V)

EFFICIENCY (%)

100

50 10 205 15 30

dc1821a F01

25 35

250mA LOAD

500mA LOAD

750mA LOAD

1A LOAD

dc1821bf

DEMO MANUAL DC1821B

Figure 4. Proper Measurement Equipment Setup Figure 5. Measuring Input or Output Ripple

QUICK START PROCEDURE

Using short twisted pair leads for any power connections

and with all loads and power supplies off, refer to Figure 4

for the proper measurement and equipment setup. The

battery/power supply (PS1) 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. Measure the input or output voltage ripple

by touching the probe tip directly across the VIN or VOUT

and GND terminals (see Figure 5), or by using an oscil-

loscope probe tip jack.

1. Jumper and PS1 settings to start:

PS1: OFF

JP1: RUN ON

JP2: MODE FIXED FREQUENCY

2. With power OFF connect the power supply (PS1) as

shown in Figure 4. If accurate current measurements

are desired (for efficiency calculations for example)

connect anammeter inseries with thesupply asshown.

The ammeter is not required however.

3. Connect a 500mA load to VOUT as shown in Figure 4

(10Ω for VOUT = 5V). Connect an ammeter if accurate

current measurement or monitoring is desired.

4. Turn on PS1 and slowly increase voltage until the volt-

age at VIN is 4V.

5. Verify VOUT is ~5V.

6. VIN can now be varied between 2.7V and 40V. IOUT

may need to be reduced for VIN < 4V.

7. Load current (IOUT) can also be varied. The maximum

IOUT is a function of VIN and the current limit. Consult

the data sheet for more information on IOUT vs VIN. In

general for VIN > 5V IOUT can be increased to 1A.

8. For operation in Burst Mode operation move Jumper

JP2 to BURST. See the data sheet for more information.

9. 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 for regulation (see

data sheet)

10.NOTE: If VOUT is changed to a voltage higher than 5V,

D1 should be removed or the LTC3114-1 could be

damaged.

GND

VIN

dc1821bf

DEMO MANUAL DC1821B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, C2 CAP CER 0.068μF 16V 10% X7R 0402 TDK, C1005X7R1C683K

2 1 C3 CAP CER 4.7μF 6.3V X5R 20% 0603 TDK, C1608X5R0J475M

3 2 C4, C13 CAP CER 22μF 25V X7R 20% 1812 TDK, C4532X7R1E226M

4 1 C5 CAP CER 1.0μF 25V X5R 0603 TDK, C1608X5R1E105M

5 1 C6 CAP CER 10μF 50V 20% X7R 2220 TDK, C5750X7R1H106M230KB

6 1 C8 CAP CER 1.0μF 50V X7R 20% 1206 TDK, C3216X7R1H105M

7 1 C9 CAP CER 4700pF 25V X7R 10% 0402 TDK, C1005X7R1E472K

8 1 C10 CAP CER 10pF 50V C0G 0402 TDK, C1005C0G1H100D

9 1 C11 CAP CER 0.047μF 25V 20% X7R 0402 TDK, C1005X7R1E473M050BC

10 1 D1 DIODE SCHOTTKY 20V NXP, PMEG2010AEH

11 1 D2 DIODE SCHOTTKY 60V, 2A NXP, PMEG6020ER,115

12 1 L1 INDUCTOR, 6.8μH ±30% COILCRAFT, MSS1048-682NLB

13 1 R1 RES 2.00M 1/16W 1% 0402 SMD VISHAY, CRCW04022M00FKED

14 1 R2 RES 499k 1/16W 1% 0402 SMD VISHAY, CRCW0402499KFKED

15 1 R3 RES SMD 10k 1% 1/16W 0402 VISHAY,CRCW040210K0FKED

16 1 R4 RES 27.4k 1/16W 1% 0402 SMD VISHAY, CRCW040227K4FKED

17 1 R5 RES 1.00M 1/16W 1% 0402 SMD VISHAY, CRCW04021M00FKED

18 1 R8 RES 49.9Ω 1/16W 1% 0402 SMD VISHAY, CRCW040249R9FKED

19 1 U1 40V, 1A BUCK-BOOST DC/DC CONVERTER WITH

PROGRAMMABLE OUTPUT CURRENT

LINEAR TECHNOLOGY, LTC3114MDHC-1

Additional Demo Board Circuit Components

20 0 C7 CAP 330μF 63V ELECT MVA SMD UNITED CHEMI-CON EMVA630ADA331MKG5S

21 0 C12 CAP CER 1000pF 25V X7R 0402 TDK, C1005X7R1E102M

22 0 C14 DNP

23 0 R6, R7 DNP

Hardware for Demo Board Only

24 4 E1, E2, E3, E4 TURRET, 0.09" DIA MILL-MAX, 2501-2-00-80-00-00-07-0

25 2 JP2, JP1 HEADERS, 3 PINS, 2mm CTRs SULLINS, NRPN031PAEN-RC

26 2 XJP1, XJP2 SHUNT, 2mm CTRs SAMTEC, 2SN-BK-G

27 4 STAND OFF STAND-OFF, NYLON 0.50" TALL KEYSTONE, 8832 (SNAP ON)

dc1821bf

DEMO MANUAL DC1821B

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

RUN

OFF BURST MODE

MODE

FIXED FREQ

GND

VOUT

VIN LDO

MODE

RUN

VIN

LDO

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 1821B

WITH PROGRAMMABLE OUTPUT CURRENT

N/A

LTC3114-1EDHC

J.NOON

11 - 7 - 15

40V, 1A SYNCHRONOUS BUCK - BOOST DC / DC CONVERTER

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 1821B

WITH PROGRAMMABLE OUTPUT CURRENT

N/A

LTC3114-1EDHC

J.NOON

11 - 7 - 15

40V, 1A SYNCHRONOUS BUCK - BOOST DC / DC CONVERTER

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 1821B

WITH PROGRAMMABLE OUTPUT CURRENT

N/A

LTC3114-1EDHC

J.NOON

11 - 7 - 15

40V, 1A SYNCHRONOUS BUCK - BOOST DC / DC CONVERTER

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

J.NOONPRODUCTION- 6-6-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

J.NOONPRODUCTION- 6-6-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

J.NOONPRODUCTION- 6-6-16

VOUT

5.0V / 1A

OPT

1uF

50V

GND

VIN

2.7V - 40V

22uF

25V

499k

10uF

50V

C14

DNP

C13

22uF

25V

1uF

25V

10k

JP2

PMEG2010AEH

4700pF

68nF

DNP

JP1

C12

DNP

27.4k

PMEG6020ER

6.8uH

C11

47nF

GND

C10

10pF

68nF

R5 1M

4.7uF

6.3V

LTC3114-1

SW1 15

RUN

BST1

PVIN

VIN

GND

MODE

PLDO 11

GND

PVOUT 3

BST2 12

SW2 2

PROG

PGND

LDO 9

FB 7

VC 6

DNP

49.9

dc1821bf

DEMO MANUAL DC1821B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2016

LT 0716• 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 application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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