Linear Technology DC2012A Guida rapida alla configurazione

dc2012af

DEMO MANUAL DC2012A

Description

LT8610AB

42V, 3.5A Micropower Synchronous

Step-Down Regulator

Demonstration circuit 2012A is a 42V, 3.5A micro-

power synchronous step-down regulator featuring the

8610AB. The LT8610AB is a compact, high efficiency,

high speed synchronous monolithic step-down switching

regulator that consumes only 2.5µA of quiescent current

when output is regulated at 5V. The efficiency of the circuit

is greater than 90% at light load up to 1.5A. This is a 10%

improvementovercompetingparts.Top and bottom power

switches,compensation components and other necessary

circuits are inside of the LT8610AB to minimize external

components and simplify design.

The SYNC pin on the demo board is grounded by default

for low ripple burst mode operation. To synchronous to an

external clock, move JP1 to SYNC and apply the external

clock to the SYNC turret. Once JP1 is on SYNC position,

a DC voltage of higher than 2V or INTVCC can be applied

to the SYNC turret for pulse-skipping operation. Figure 1

shows the efficiency of the circuit at 12V input.

L, LT, LTC, LTM, 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

Figure 2 shows the thermal performance of the circuit.

When running at input voltage greater than 30V, 3.5A

output current and 2MHz switching frequency, the tem-

perature rise will be significant. Either reducing the input

voltage, the output current or the switching frequency will

bring the temperature down to acceptable level without

external cooling.

The demo board has an EMI filter installed. The board

and the IC are designed to minimize conducted and radi-

ated EMI. The conducted EMI performance of the board

is shown on Figure 3. The limit in Figure 3 is EN55022

class B, average. It shows the circuit passes the test with

a wide margin.

The LT8610AB data sheet gives a complete description of

the part, operation and application information. The data

sheet must be read in conjunction with this quick start

guide for DC2012A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2012A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN* Input Supply Range 5.5 42 V

VOUT Output Voltage 4.8 5 5.2 V

IOUT Maximum Output Current 3.5 A

fSW Switching Frequency 1.85 2 2.15 MHz

EFE Efficiency at DC IOUT = 1A 91 %

* Refer to Figure 2 to determine the maximum input voltage. If IC temperature exceeds target, reduce input voltage, output current or switching

frequency.

dc2012af

DEMO MANUAL DC2012A

Quick start proceDure

DC2012A is easy to set up to evaluate the performance of

the LT8610AB. Refer to Figure 4 and Figure 5 for proper

measurement equipment setup and follow the procedure

below:

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

and GND.

2. With power off, connect the load VOUT and GND.

3. Check JP1 setting

4. Turn on the power at the input.

5. Carefully evaluate other design parameters as needed.

Figure 1. LT8610AB 12VIN to 5VOUT Efficiency at

2MHz Switching Frequency

Figure 2. LT8610AB Case Temperature Rise.

VOUT = 5V, TA= 25°C

Figure 3. LT8610AB Demo Circuit Conducted EMI Performance

LOAD CURRENT (A)

EFFICIENCY (%)

DC2012A F01

100

60 0 0.01 1 100.1

VIN (V)

CASE TEMPERATURE RISE (°C)

DC2012A F02

140

120

100

06 11 21 3616 3126

2MHz, 3.5A

700kHz, 3.5A

2MHz, 2.5A

START 150kHz

RES BW 9kHz

VBW 62kHz STOP 30MHz

dBµV

DC2012A F03

–10

–20

–30

EN55022 CLASS B

dc2012af

DEMO MANUAL DC2012A

Quick start proceDure

Figure 4. Proper Measurement Equipment Setup

Figure 5. Measure Output Ripple

dc2012af

DEMO MANUAL DC2012A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 CAP., X7R, 2.2µF, 50V, 10%, 1206 MURATA, GCJ31CR71H225KA12L

2 1 C4 CAP., X7R, 0.22µF, 16V, 10%, 0603 AVX, 0603YC224KAT2A

3 1 C5 CAP., C0G, 10pF, 25V, 10%, 0402 AVX, 04023A100KAT2A

4 2 C6, C14 CAP., X7R, 47µF, 10V, 10%, 1210 MURATA, GRM32ER71A476KE15L

5 1 C7 CAP., X7R, 1.0µF, 25V, 10%, 0603 MURATA, GRM188R71E105KA12D

6 1 C8 CAP., X7R, 0.1µF, 16V, 10%, 0402 MURATA, GRM155R71C104KA88D

7 1 L1 IND., 2.2µH COILCRAFT, XAL5030-222MEC

8 1 R2 RES., CHIP, 18.2k, 1/10W, 1% 0603 VISHAY, CRCW060318K2FKEA

9 1 R3 RES., CHIP, 49.9k, 1/16W, 1% 0402 VISHAY, CRCW040249K9FKED

10 2 R1, R4 RES., CHIP, 1M, 1/16W, 1% 0402 VISHAY, CRCW04021M00FKED

11 1 R5 RES., CHIP, 243k, 1/16W, 1% 0402 VISHAY, CRCW0402243KFKED

12 1 U1 IC, LT8610ABEMSE#PBF MSE16 LINEAR TECH, LT8610ABEMSE#PBF

Additional Demo Board Circuit Components

1 1 C1 CAP., ALUM, 22µF, 63V SUN ELECT, 63CE22BS

2 2 C3, C10 CAP., X7R, 4.7µF, 50V, 10%, 1206 MURATA, GRM31CR71H475KA12L

3 1 C9 CAP., X7R, 1.0µF, 16V, 10%, 0805 AVX, 0805YC105KAT2A

4 1 C11, C12 CAP., X7R, 0.1µF, 50V, 10%, 0402 TDK, C1005X7R1H104K

5 2 C13 CAP., X7R, 0.1µF, 50V, 10%, 0603 MURATA, GCJ188R71H104KA12D

6 1 FB1 FERRITE BEAD 0805 TDK, MPZ2012S101AT

7 1 L2 IND., 4.7µH VISHAY, IHLP2020BZ-ER4R7M01

8 0 R6 RES., OPT, 0402 OPT

Hardware: For Demo Board Only

1 9 E1-E9 TESTPOINT, TURRET, .094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 HEADER 1X3 079 SAMTEC, TMM-103-02-L-S

3 1 XJP1 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G

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

dc2012af

DEMO MANUAL DC2012A

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

ALL CAPACITORS ARE 0402.

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 0402.

SUNCON

63CE22BS

(2MHz)

REFER TO THE DEMO MANUAL FOR VIN RANGE.

VOUT

OPT

243k

GND E2

GND

EN/UV

C14

47uF

10V

1210

C14

47uF

10V

1210

2.2uF

50V

1206

2.2uF

50V

1206

LT8610ABEMSE

VIN

EN/UV

SYNC

INTVCC

TR/SS

PGND

GND

FB 16

PG 15

BIAS 14

SW 11

SW 10

SW 9

BST 12

GND

C12

0.1uF

50V

C12

0.1uF

50V

JP1

GND

SYNC

JP1

GND

SYNC

1uF

0603

25V

1uF

0603

25V

SYNC

C11

0.1uF

50V

C11

0.1uF

50V

2.2uH

XAL5030-222MEC

2.2uH

XAL5030-222MEC

C13

0.1uF

0603

50V

C13

0.1uF

0603

50V

18.2k

0603

18.2k

0603

FB1FB1

TR/SS

1uF

0805

16V

1uF

0805

16V

1Meg

0.1uF

4.7uH

10pF

47uF

10V

1210

47uF

10V

1210

4.7uF

50V

1206

4.7uF

50V

1206

E8 PG

22uF

63V

22uF

63V

49.9k

E4 GND

C10

4.7uF

50V

1206

C10

4.7uF

50V

1206

0.22uF

0603

16V

0.22uF

0603

16V

VOUT

5V / 3.5A

VOUT

5V / 3.5A

VIN

5.5V - 42V E1

VIN

5.5V - 42V

dc2012af

DEMO MANUAL DC2012A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 1113 • 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

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