Linear Technology DC2434A Quick setup guide

dc2434af

DEMO MANUAL DC2434A

Description

LTC3864

60V Low IQ Step-Down DC/DC Converter

with 100% Duty Cycle Capability

Demonstration circuit 2434A is a high voltage, current-

modeDC/DCstep-downconverterfeaturingtheLT C

3864.

The board operates from an input range of 6V to 60V and

provides a 12V, 5A output when the input exceeds 12V.

The PMOSFET architecture allows it to operate seamlessly

up to 100% duty cycle and function as a saturated switch

below the regulation threshold, down to 6VIN. It operates

at 200kHz and may be synchronized to an external clock.

A soft-start feature controls output voltage slew rate at

start-up, reducing current surge and voltage overshoot.

Burst Mode

operation that improves efficiency at light L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks

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

owners.

performance summary

loads can be enabled with a jumper. A power good output

signal is provided.

This board is suitable for a wide range of automotive,

telecom, industrial and other applications. The LTC3864

is available in small 12-pin thermally enhanced MSOP and

DFN packages. For other output requirements, see the

LTC3864 data sheet or contact the LTC factory.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2434A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 6 60 V

VOUT Output Voltage 12 V

IOUT Output Current Range, Continuous Free Air 0 5 A

fSW Switching (Clock) Frequency 200 kHz

VOUT(P-P) Output Ripple VIN = 14V, IOUT = 5A (20MHz BW) 45 mVP–P

IREG Output Regulation Line and Load (13VIN to 60VIN, 0.1AOUT to 5AOUT) ±0.4 %

POUT/PIN Efficiency (see Figure 3) VIN =14V, IOUT = 5A 97.0 %

Approximate Size Component Area x Top Component Height 1.3 × 1.0 × 0.39 Inches

dc2434af

DEMO MANUAL DC2434A

Quick start proceDure

Demonstration circuit 2434 is easy to set up to evaluate

the performance of the LTC3864. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below:

NOTE. When measuringthe output voltageripple, care must

be taken to avoid a long ground lead on the oscilloscope

probe. Measure the output voltage ripple by touching the

probe tip and ground ring directly across the last output

capacitor as shown in Figure 1.

1. Set an input power supply that is capable of 6V to 60V

to 13V. Then turn off the supply.

2. Withpoweroff, connect the supply to theinputterminals

+VIN and GND.

a. Input voltages lower than 6V can keep the converter

from turning on due to the undervoltage lockout

feature of the LTC3864.

b. If efficiency measurements are desired, an ammeter

capable of measuring 5ADC or a resistor shunt can

be put in series with the input supply in order to

measure the DC2434A’s input current.

c. A voltmeter with a capability of measuring at least

60V can be placed across the input terminals in order

to get an accurate input voltage measurement.

3. Turn on the power at the input.

NOTE. Make sure that the input voltage never exceeds 60V.

4. Check for the proper output voltage of 12V. Turn off

the power at the input.

5. Oncethe proper output voltage is established, connect a

variable load capable of sinking 5A at 12V to the output

terminals +VOUT and GND. Set the current for 0A.

a. If efficiency measurements are desired, an ammeter

or a resistor shunt that is capable of handling 5ADC

can be put in series with the output load in order to

measure the DC2434A’s output current.

b. A voltmeter with a capability of measuring at least

12V can be placed across the output terminals in

ordertoget an accurate output voltage measurement.

6. Turn on the power at the input.

NOTE. If there is no output, temporarily disconnect the

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

7. Once the proper output voltage is again established,

adjust the load and/or input within the operating range

and observe the output voltage regulation, ripple volt-

age, efﬁciency and other desired parameters.

Figure 1. Proper Measurement Equipment Setup

DC2434 F01

+–

VOUT

IOUT

VIN

IIN

+–

LOAD

–

dc2434af

DEMO MANUAL DC2434A

Quick start proceDure

Figure 2. Efficiency with Burst Mode Operation at Light Loads

Figure 3. Output Ripple at 28VIN and 5AOUT (50mV, 5µs/Div, 20MHz)

Figure 4. Transient Response Waveform at 14VIN and 2.5A–5A–2.5AOUT (2A, 200mV, 200µs/Div)

IOUT (A)

EFFICIENCY (%)

DC2434 F02

100

0.1

VIN = 14V

VIN = 28V

5µs/DIV

50mV/DIV

DC2434 F03

200µs/DIV

2.00A/DIV

200mV/DIV

DC2434 F04

dc2434af

DEMO MANUAL DC2434A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 CIN1, CIN2 CAP., ALUM, 22µF, 63V 6.3x7.7 PANASONIC, EEHZA1J220XP

2 3 CIN3, CIN4, CIN5 CAP., X7S, 4.7µF, 100V, 10%, 1210 MURATA, GRM32DC72A475KE01

3 2 COUT1, COUT2 CAP., X7R, 10µF, 16V, 10%, 1206 MURATA, GRM31CR71C106KA12

4 1 COUT3 CAP., ALUM 56µF, 25V 6.3x5.8 PANASONIC, EEHZA1E560P

5 1 C3 CAP., NPO, 1000pF, 50V, 10%, 0603 AVX, 06035A102KAT2A

6 1 C4 CAP., X7R, 0.47µF, 16V, 10%, 0603 MURATA, GCM188R71C474KA55L 

7 1 C5 CAP., X7R, 0.1µF, 100V, 10%, 0805 MURATA, GRM21BR72A104KAC4

8 1 C7 CAP., X7R, 0.1µF, 50V, 10%, 0603 MURATA, GCM188R71H104KA57D 

9 1 C8 CAP., COG, 3300pF, 50V, 5%, 0603 MURATA, GCM1885C1H332JA16D 

10 1 C9 CAP., COG, 330pF, 50V, 5%, 0603 MURATA, GCM1885C1H331JA16D 

11 1 C10 CAP., COG, 10pF, 50V, 5%, 0603 MURATA, GCM1885C1H100JA16D 

12 1 D1 SCHOTTKY DIODE, 60V, 10A, DFN5-SO-8FL ON SEMI, NRVB860MFST1G

13 1 L1 INDUCTOR, 15µH COILCRAFT, XAL1510-153

14 1 Q1 FET, P-CHAN., 100V, PowerPak SO-8 FAIRCHILD, FDMS86163P

15 1 R1 RES., 100kΩ, 1/8W, 1%, 0805 VISHAY, CRCW0805100KFKEA

16 1 R2 RES., 21.5kΩ, 1/10W, 1%, 0603 VISHAY, CRCW060321K5FKEA

17 1 R5 RES., 100Ω, 1/10W, 1%, 0603 VISHAY, CRCW0603100RFKEA

18 1 R7 RES., 13mΩ, 1W, 1%, 0612 PANASONIC, ERJ-B2CFR013V

19 1 R9 RES., 37.4kΩ, 1/10W, 1%, 0603 VISHAY, CRCW060337K4FKEA

20 1 R10 RES., 10kΩ, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA

21 1 R11 RES., 464kΩ, 1/10W, 1%, 0603 VISHAY, CRCW0603464KFKEA

22 1 R12 RES., 33.2kΩ, 1/10W, 1%, 0603 VISHAY, CRCW060333K2FKEA

23 1 R13 RES., 1.0kΩ, 1/10W, 1%, 0603 VISHAY, CRCW06031K00FKEA

24 1 R14 RES., 100kΩ, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA

25 1 U1 IC, LTC3864EMSE MSE12 LINEAR TECH.CORP. LTC3864EMSE#PBF

Additional Demo Board Circuit Components

1 0 C1 CAP., OPT 0603 OPT

2 0 C2 CAP., OPT 0805 OPT

3 0 D2 SCHOTTKY DIODE, OPT, SOD323 OPT

4 0 R6, R15 RES., OPT, 0603 OPT

5 1 R4 RES., 0Ω, 1/16W, 0603 VISHAY, CRCW06030000Z0EA

Hardware: For Demo Board Only

1 8 E1, E2, E3, E4, E5, E6,

E7, E8

TESTPOINT, TURRET, .094" MILL MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 CONN., HEADER, 1X3, 2mm WURTH ELEKTRONIK, 62000311121

3 1 JP2 CONN., HEADER, 2X3, 2mm WURTH ELEKTRONIK, 62000621121

4 2 XJP1, XJP2 SHUNT, 2mm WURTH ELEKTRONIK, 60800213421

5 4 J1, J2, J3, J4 CONN, BANANA JACK, KEYSTONE 575-4

6 4 MTGS AT 4 CORNERS STAND-OFF, SNAP ON NYLON 0.50" tall KEYSTONE, 8833

dc2434af

DEMO MANUAL DC2434A

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

NOTE: UNLESS OTHERWISE SPECIFIED

100V

16V 100V

16V

XAL1510-153

60V

12V / 5A

1. ALL RESISTORS AND CAPACITORS ARE 0603.

6.3x7.7

63V

6.3x5.8

25V

DEMO CIRCUIT DC2434A

GND

VIN

VOUT

12V - 60V

CAUTION, SHOCK HAZARD: CONTACT WITH HIGH VOLTAGE

CAN RESULT IN A DANGEROUS ELECTRIC SHOCK.

6.3x7.7

VIN

GND

100V

VOUT

CIN1,2 Panasonic EEHZA1J220XP

COUT4 Panasonic EEHZA1E560P

COUT1 muRata GCM32DR71C106KA37

R1 SUSUMU PRL1632-R013-F-T1

L1 COILCRAFT XAL1510-153

63V

(6V Min)

SDN

CLKIN

PGOOD

VOUT

VIN

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

DBPRODUCTION2 10-10-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

DBPRODUCTION2 10-10-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

DBPRODUCTION2 10-10-16

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

Monday, October 10, 2016

60V, LOW I , STEP-DOWN CONTROLLER

N/A

LTC3864EMSE

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

Monday, October 10, 2016

60V, LOW I , STEP-DOWN CONTROLLER

N/A

LTC3864EMSE

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

Monday, October 10, 2016

60V, LOW I , STEP-DOWN CONTROLLER

N/A

LTC3864EMSE

15uH

C10

10pF

R15

OPT

0.1uF

0805

COUT3

56uF

R13

OPT

R12

33.2K

C7 0.1uF

CIN2

22uF

R11

464K

13m

0612

FDMS86163P

GATE

100K

0805

1nF

COUT1

10uF

1206

OPT

0805

OPT

21.5K

OPT

CIN4

4.7uF

1210

CIN3

4.7uF

1210

COUT2

CIN5

4.7uF

1210

100

330pF

NRVB860MFS

LTC3864EMSE

VFB

GND

FREQ

PLL/MODE

GND

SENSE 10

CAP 9

RUN 8

PGOOD 7

ITH

VIN 11

GATE 12

CIN1

22uF

3.3nF

R9 37.4K

JP2

BURST

CLKIN

SKIP

MODE

6 5

0.47uF

JP1

OFF

SHDN

R14

100K

R10

10K

CAP

FREQ

dc2434af

DEMO MANUAL DC2434A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1216 • 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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