Linear Technology DC2565A Quick setup guide

dc2565af

DEMO MANUAL DC2565A

Description

LT8607

42V, 0.75A Micropower Synchronous

Step-Down Regulator

Demonstration Circuit 2565A is a 42V, 0.75A micropower

synchronous step-down regulator featuring the LT

8607.

The demo board is designed for 5V output from a 5.5V

to 42V input. The wide input range allows a variety of

input sources, such as automotive batteries and indus-

trial supplies. The LT8607 is a compact, high efficiency,

high speed synchronous monolithic step-down switch-

ing regulator that consumes less than 3μA of quiescent

current when output is regulated at 5V. Top and bottom

power switches, compensation components and other

necessary circuits are inside of the LT8607 to minimize

external components and simplify design.

The SYNC pin on the demo board is grounded by default

for low ripple Burst Mode

operation. Move JP1 to PULSE

SKIPPING position can change the operation mode to

pulse-skipping operation. Once JP1 is on SPREAD SPEC-

TRUM position, VCC is applied to the SYNC pin for low

EMI spread spectrum operation. To synchronous to an

external clock, move JP1 to SYNC and apply the external

clock to the SYNC turret. Figure 1 shows the efficiency

of the circuit.

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

of Analog Devices, Inc. All other trademarks are the property of their respective owners.

performance summary

The demo board has an EMI filter installed. The radiated

EMI performances of the board (with EMI filter) are shown

in Figure 2 and Figure 3. The red lines in Figure 2 and

Figure 3 are CISPR25 Class 5 peak limit. To use the EMI

filter, the input should be tied to VEMI, not VIN. An induc-

tor L2, which is a 0Ω jumper on the board by default

now, can be added in the EMI filter to further reduce the

conducted emission.

The LT8607 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 DC2565A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2565A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Voltage Range 5.5 42 V

VOUT Output Voltage 4.8 5 5.2 V

IOUT Maximum Output Current 0.75 A

fSW Switching Frequency 1.85 2 2.15 MHz

EFE Efficiency at DC VIN = 12V, IOUT = 0.75A 92.4 %

dc2565af

DEMO MANUAL DC2565A

Quick start proceDure

DC2565A is easy to set up to evaluate the performance

of the LT8607. Refer to Figure 4 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. See Figure 5 for the proper scope

technique.

1. Set an input power supply that is capable of 42V/0.75A.

Then turn off the supply.

2. With power off, connect the supply to the input termi-

nals VIN and GND.

3. Turn on the power at the input.

NOTE:Make sure that the input voltage never exceeds

42V.

4. Check for the proper output voltage of 5V. Turn off the

power at the input.

5. Once the proper output voltage is established, connect

a variable load capable of sinking 0.75A at 5V to the

output terminals V

OUT

and GND. Set the current for 0A.

a. If efficiency measurements are desired, an ammeter

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

measure the DC2565A’s output current.

b. A voltmeter can be placed across the output ter-

minals in order to get 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 established again,

adjust the load and/or input within the operating range

and observe the output voltage regulation, ripple volt-

age, efficiency and other desired parameters.

8. An external clock can be added to the SYNC termi-

nal when SYNC function is used (JP1 on the SYNC

position). Please ensure that the chosen RT sets the

LT8607 switching frequency to equal or below the low-

est SYNC frequency. See the Synchronization section

in the data sheet.

Figure 1. Efficiency vs Load Current at 2MHz Switching Frequency

IOUT (A)

EFFICIENCY

100

0.15 0.3 0.45 0.6 0.75

DC2565A F01

VIN = 12V

VIN = 24V

dc2565af

DEMO MANUAL DC2565A

Quick start proceDure

FREQUENCY (MHz)

–10

–5

AMPLITUDE (dBuV/m)

50 VERTICAL POLARIZATION

PEAK DETECTOR

100 200 300 400 500 600 700 800 900 1000

DC2565A F02

CLASS 5 PEAK LIMIT

FIXED FREQUENCY

SPREAD SPECTRUM MODE

FREQUENCY (MHz)

–10

–5

AMPLITUDE (dBuV/m)

100 200 300 400 500 600 700 800 900 1000

DC2565A F03

HORIZONTAL POLARIZATION

PEAK DETECTOR

CLASS 5 PEAK LIMIT

FIXED FREQUENCY

SPREAD SPECTRUM MODE

Figure 2. LT8607 Demo Circuit EMI Performance in CISPR25

Radiated Emission Test, Antenna Polarization: Vertical

(VIN = 14V, VOUT = 5V, IOUT = 0.75A, 2MHz Switching Frequency)

Figure 3. LT8607 Demo Circuit EMI Performance in CISPR25

Radiated Emission Test, Antenna Polarization: Horizontal

(VIN = 14V, VOUT = 5V, IOUT = 0.75A, 2MHz Switching Frequency)

Figure 4. Proper Measurement Equipment Setup

Figure 5. Measuring Output Ripple

OUT

GND

dc2565af

DEMO MANUAL DC2565A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C2 CAP., X7R, 4.7µF, 50V, 10% 1206 MURATA, GRM31CR71H475K

2 1 C4 CAP., X7R, 0.22µF, 16V, 10%, 0603 MURATA, GRM188R71C224KA01D

3 1 C5 CAP., C0G, 10pF, 25V, 5%, 0603 AVX, 06033A100JAT2A

4 1 C6 CAP., X7R, 22µF, 10V, 10%, 1206 MURATA, GRM31CR71A226KE15L

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

6 1 C8 CAP., X7R, 0.01µF, 16V, 10%, 0603 MURATA, GRM188R71C103KA01D

7 1 L1 IND., 3.3µH WURTH ELECTRONICS, 74438336033

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

9 1 R3 RES., CHIP, 49.9k, 1/10W, 1%, 0603 VISHAY, CRCW060349K9FKEA

10 2 R1, R4 RES., CHIP, 1M, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA

11 1 R5 RES., CHIP, 187k, 1/10W, 1%, 0603 VISHAY, CRCW0603187KFKEA

12 1 U1 IC, REGULATOR, MSE10 LINEAR TECH., LT8607EMSE#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, GRM31CR71H475K

3 1 C9 CAP., X7R, 4.7µF, 16V, 10%, 0805 MURATA, GRM21BR71C475K73L

4 1 C11 CAP., X7R, 1µF, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L

5 2 C12, C13 CAP., X7R, 0.1µF, 50V, 10%, 0603 MURATA, GRM188R71H104KA93D

6 1 FB1 FERRITE BEAD 0805 TDK, MPZ2012S331AT000

7 1 L2 RES., CHIP, 0Ω, 3/4W, 2010 VISHAY, CRCW20100000Z0EF

8 0 R6 (OPT.) RES., 0603

Hardware: For Demo Board Only

1 9 E1-E9 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 E10 (OPT.) TESTPOINT, TURRET, 0.094"

3 1 JP1 DOUBLE ROW HEADER 2 × 4 0.079" WURTH ELECTRONICS, 62000821121

4 1 XJP1 SHUNT, 0.079" CENTER WURTH ELECTRONICS, 60800213421

5 4 MH1-MH4 STAND-OFF, NYLON 0.50" TALL WURTH ELECTRONICS, 702935000

dc2565af

DEMO MANUAL DC2565A

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

C C

B B

A A

ALL CAPACITORS ARE 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 0603.

SUNCON

63CE22BS

(2MHz)

SYNC

SPREAD SPECTRUM

PULSE SKIPPING

BURST

VOUT

VCC

18.2k

EN/UV

SYNC

GND

3.3µH

74438336033

22µF

63V

1.00M

22µF

10V

1206

TR/SS

C11

1µF

50V

0805

0.01µF

0.22µF

C10

4.7µF

50V

1206

49.9k

E8 PG

1µF

(Opt)

VOUT

5V /0.75A

JP1

1 2

GND

0 2010

1.00M

187k C5

10pF

VEMI

5.5V - 42V

4.7µF

50V

1206

C13

0.1µF

50V

4.7µF

50V

1206

FB1

MPZ2012S331AT000

LT8607EMSE

VIN

EN/UV

SYNC

VCC

TR/SS

FB 6

PG 8

SW 2

BST 1

GND

C12

0.1µF

50V

4.7µF

16V

0805

GND

E10

VIN

5.5V - 42V

dc2565af

DEMO MANUAL DC2565A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0517 • 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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