Linear Technology DC2110A Quick setup guide

dc2110af

DEMO MANUAL DC2110A

Description

LT8631

100V, 1A Synchronous

Micropower Step-Down Regulator

Demonstration circuit 2110A is a monolithic step-down

converter featuring LT

8631. The demo board is designed

for 5V output from a 6.5V to 100V input at 400kHz switch-

ing frequency. The wide input range makes it suitable for

regulating power from a wide variety of sources, includ-

ing automotive, industrial systems and telecom supplies.

The LT8631 is a compact, high efficiency synchronous

monolithic step-down switching regulator. The power

switch, compensation and other necessary circuits are

inside of the LT8631 to minimize external components

and simplify design.

The LT8631 switching frequency can be programmed

either via oscillator resistor or external clock over a

100kHz to 1MHz range. The SYNC pin on the demo board

is grounded (JP1 at Burst Mode

position) by default for

low ripple Burst Mode operation. To synchronize to an

external clock, move JP1 to SYNC and apply the external

clock to the SYNC turret. If the pulse-skipping operation

is required, move JP1 to fixed frequency position. Figure 1

shows the efficiency of the circuit at 12V input at the Burst

Mode selection.

The demo board has an EMI filter installed. The EMI per-

formance of the board (with EMI filter) is shown in Figure

2. The red line in Figure 2 is CISPR25 Class 5 peak limit.

The figure shows that the circuit passes the test with a

wide margin. To achieve EMI/EMC performance as shown 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

in Figure 2, the input EMI filter is required and the input

voltage should be applied at VEMI turret pin, not VIN.

The LT8631 data sheet gives a complete description of

the part, operation and application information. The data

sheet must be read in conjunction with this demo manual

for demo circuit 2110A. The LT8631 is assembled in a

20-lead TSSOP packages. Proper board layout is essential

for maximum thermal and electrical performance. See the

data sheet sections for details.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2110A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 6.5 100 V

VOUT Output Voltage 4.88 5.04 5.2 V

fSW Switching Frequency RT= 25.5kΩ 370 400 430 kHz

IOUT Max Output Current VIN = 12V 1 A

EFE Efficiency at DC VIN = 12V, IOUT = 1A 82.6 %

VIN = 12V, IOUT = 0.4A 89.5 %

Figure 1. LT8631 Efficiency vs Load Current

LOAD CURRENT (A)

EFFICIENCY (%)

50 0.70.5 0.9

DC2110a F01

0.60.40.30.1 0.2 0.8

fSW = 400kHz

VIN = 12V

VOUT = 5V

dc2110af

DEMO MANUAL DC2110A

Quick start proceDure

Demonstration circuit 2110A is easy to set up to evalu-

ate the performance of the LT8631. Refer to Figure 3 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 4 for the proper

scope technique.

1. Place JP1 on GND position.

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

and GND. If the EMI/EMC performance is not important,

the input EMI filter can be bypassed by connecting the

input power supply to VIN and GND.

3. With power off, connect loads from VOUT to GND.

4. Turn on the power at the input.

Make sure that the input voltage does not exceed 100V.

5. Check for the proper output voltages (VOUT = 5V).

NOTE. If there is no output, temporarily disconnect the

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

shorted.

6. Once the proper output voltage is established, adjust

the load within the operating ranges and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters.

7. An external clock can be added to the SYNC terminal

when SYNC function is used (JP1 on the SYNC posi-

tion). Please ensure that the chosen RT sets the LT8631

switching frequency to 10% below the lowest SYNC

frequency. See the data sheet Synchronization section

for details.

Figure 2. LT8631 Demo Circuit DC2110A EMI Performance in CISPR25 Radiated Emission Test

(14V Input from VEMI Turret Pin, IOUT = 1A)

-5

0 100 200 300 400 500 600 700 800 900 1000

Amplitude (dBuV/m)

Frequency (MHz)

Detector: +Peak

Polarity: Vertical

Data

Class 5

Peak

-5

Amplitude (dBuV/m)

Detector: +Peak

Polarity: Horizontal

Data

Class 5

Peak

-5

0 100 200 300 400 500 600 700 800 900 1000

Frequency (MHz)

dc2110af

DEMO MANUAL DC2110A

Quick start proceDure

Figure 3. Proper Measurement Equipment Setup

Figure 4. Measurement Input or Output Ripple

OUT

GND

POWER

SUPPLY VIN

–

–+

IIN

VOUT

–

IOUT

LOAD

dc2110af

DEMO MANUAL DC2110A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, 0.1µF, X7R, 10V, 10% 0402 TDK, C1005X7R1A104K

2 1 C5 CAP, 2.2µF, X5R, 10V, 10% 0402 TDK, C1005X5R1A225K050BC

3 1 C6 CAP, 4.7pF, C0G, 50V, 0.25pF 0603 MURATA, GRM1885C1H4R7CA01D

4 1 C7 CAP, 47µF, X7R, 10V, 20% 1210 MURATA, GRM32ER71A476KE15L

5 1 C8 CAP, 0.1µF, X7R, 10V, 10% 0603 AVX, 0603ZC104KAT2A

6 1 C4 CAP, 1µF, X7R, 10V, 10% 0603 SAMSUNG, CL10B105KP8NNNC

7 1 L1 INDUCTOR, 22µH IHLP2525 VISHAY, IHLP2525CZER220M11

8 1 L2 INDUCTOR, 2.2µH COILCRAFT, XFL4020-222MEB

9 1 R1 RES, 51.1k, 1/10W, 1% 0603 VISHAY, CRCW060351K1FKEA

10 2 R2, R4 RES, 1M, 1/10W, 1% 0603 VISHAY, CRCW06031M00FKEA

11 1 R3 RES, 25.5k, 1/10W, 1% 0603 VISHAY, CRCW060325K5FKEA

12 1 R5 RES, CHIP, 191k, 1/10W, 1% 0603 VISHAY, CRCW0603191KFKEA

13 1 U1 IC, BUCK REG FE-20(16) CB LINEAR TECHNOLOGY, LT8631EFE#PBF

Additional Demo Board Circuit Components

1 1 C2 CAP, ALUM, 10µF, 100V SUN ELECTRONIC, 100CE10BS

2 0 C11 (OPT) CAP, 0603

3 0 D1 (OPT) SCHOTTKY BARRIER REC, POWER-DI-123

Hardware: For Demo Board Only

1 10 E1 TO E10 TEST POINT, TURRET, 0.094" MTG.HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 4 PIN 0.079 SINGLE ROW HEADER SULLIN, NRPN041PAEN-RC

3 1 XJP1 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

4 0 R6 (OPT) RES, 0603

5 4 MH1 TO MH4 STAND-OFF, NYLON 0.50" KEYSTONE, 8833 (SNAP ON)

dc2110af

DEMO MANUAL DC2110A

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

IHLP2525CZER220M11

10V

(400kHz)

10V

1. ALL RESISTORS ARE 0603.

ALL CAPACITORS ARE 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

VIN

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

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.

www.linear.com

DEMO CIRCUIT 2110A

Tuesday, July 07, 2015 11

100V 1A SYNCHRONOUS

N/A

LT8631EFE

MICROPOWER BUCK REGULATOR

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

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.

www.linear.com

DEMO CIRCUIT 2110A

Tuesday, July 07, 2015 11

100V 1A SYNCHRONOUS

N/A

LT8631EFE

MICROPOWER BUCK REGULATOR

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

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.

www.linear.com

DEMO CIRCUIT 2110A

Tuesday, July 07, 2015 11

100V 1A SYNCHRONOUS

N/A

LT8631EFE

MICROPOWER BUCK REGULATOR

VEMI

1uF

10V

0.1uF

0402

2.2uF

100V

1210

51.1k

22uH

25.5K

LT8631EFE

INTVCC

VIN

SYNC/MODE

BST

IND

GND

VOUT

EN/UV

TR/SS

GND

47uF

10V

1210

C10

2.2uF

100V

1210

VOUT

5V / 1A

2.2uF

0402

E7 SYNC

OPT

0.1uF

E10

TR/SS

EN/UV

2.2uH

XFL4020-222ME

C11

0.1uF

100V

10uF

100V

100CE10BS

JP1

FIXED FREQ

BURST MODE

SYNC

GND

2.2uF

100V

1210

E1 PG

OPT

DFLS1100

VIN

6.5V - 100V

4.7pF

191k

E6 GND

dc2110af

DEMO MANUAL DC2110A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

©LINEAR TECHNOLOGY CORPORATION 2015

LT 0915 • 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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