Linear Technology DC2251A Kurzanleitung zur Einrichtung

dc2251af

DEMO MANUAL DC2251A

Description

LTM8065

40V, 2.5A Silent Switcher

µModule Regulator

Demonstration circuit 2251A is a 40V, 3.5A peak, 2.5A

continuous step-down μModule

regulator featuring the

LTM

8065. The demo board is designed for 5V output

from a 6V to 40V input. The wide input range allows a

variety of input sources, such as automotive batteries and

industrial supplies. The user adjustable features of the

LTM8065 such as output voltage, switching frequency,

soft-start and power good can be changed on DC2251A

simply by modifying the appropriate resistors and/or

capacitors.

The LTM8065 can be programmed to different operation

modes. The SYNC pin on the demo board is grounded

(JP1 at BURST position) by default for low ripple Burst

Mode

operation. Pulse-skipping mode, spread spectrum

mode or synchronization mode can be selected respec-

tively by moving JP1 shunt to SYNC position and adding

different signals to SYNC terminal. See Quick Start Pro-

cedure section for more details.

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

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

owners.

BoarD photo

Figure 1 shows the efficiency of the circuit under differ-

ent input voltages in Burst Mode operation. The rated

maximum continuous load current is 2.5A, while derating

is necessary for certain input voltage and thermal condi-

tions. Figure 2 shows the LTM8065 derating curve on

DC2251A demo board. The demo board has an optional

EMI filter. To achieve high EMI/EMC performance, the

input EMI filter is required and the input voltage should

be applied at VIN_EMI terminal.

The LTM8065 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 2251A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2251A

dc2251af

DEMO MANUAL DC2251A

Quick start proceDure

Demonstration circuit 2251A is easy to set up to evalu-

ate the performance of the LTM8065. 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 output voltage ripple by

touching the probe tip directly across the output capacitor.

See Figure 4 for the proper scope technique.

1. Place JP1 on BURST position.

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

and GND. If the input EMI filter is desired, install the

filter and connect the input power supply to VIN_EMI

and GND.

3. With power off, connect the load from VOUT to GND.

4. Turn on the power at the input.

NOTE. Make sure that the input voltage does not exceed

40V.

5. Check for the proper output voltage (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.

Figure 1. LTM8065 Demo Circuit DC2251A Efficiency vs. Load

Current (fSW = 1MHz, VOUT = 5V, Burst Mode Operation)

Figure 2. LTM8065 Demo Circuit DC2251A

Maximum Load Current Derating

performance summary

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN* Input Supply Range 6 40 V

VOUT Output Voltage 4.85 5 5.15 V

IOUT** Maximum Continuous Output Current 2.5 A

fSW Switching Frequency VIN = 12V , IOUT = 2.5A 1 MHz

EFE Efficiency at DC VIN = 12V , IOUT = 2.5A 91.5 %

* When VIN voltage is low, the LTM8065 may skip switching cycles.

** Derating is necessary for certain VIN and thermal conditions.

LOAD CURRENT (A)

0.001

0.01

0.1

EFFICIENCY (%)

DC2251A F01

12V

24V

0 LFM

12V

24V

36V

AMBIENT TEMPERATURE (°C)

100

125

MAXIMUM LOAD CURRENT (A)

DC2251A F02

dc2251af

DEMO MANUAL DC2251A

Quick start proceDure

Figure 4. Proper Measurement Equipment Setup

7. JP1 is placed on BURST position by default, for the low

ripple Burst Mode operation. When JP1 is placed on

SYNC position,LTM8065can operate in pulse-skipping

mode,spread spectrum mode or synchronization mode

respectively, based on the different SYNC terminal

inputs. If SYNC terminal is floating, LTM8065 is in

pulse-skipping mode. If an external clock is driving the

SYNC terminal, LTM8065 is in synchronization mode.

Please make sure that RT should be choseN to set the

LTM8065 switching frequency equal to or below the

lowest SYNC frequency. If a 2.9V to 4.2V DC voltage

is tied to the SYNC terminal, LTM8065 is in spread

spectrum mode. This DC voltage can also be added

through a voltage divider (R7 and R8) from the output.

Therecommendeddividerbottomresistor (R8) is 200k.

DC2251A F03

–

+–

VOUT

IOUT

–

+–

–

LOAD

VIN

IIN

POWER

SUPPLY

–

Figure 3. Measuring Output Ripple

–

VOUT

GND

DC2251A F04

dc2251af

DEMO MANUAL DC2251A

Quick start proceDure

Figure 5. DC2251A Output Noise Spectrum, VIN = 12V, VOUT = 5V, IOUT = 2.5A, fSW = 1MHz

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., X5R, 47µF, 10V, 20%, 0805 MURATA, GRM21BR61A476ME15L

2 1 C2 CAP., X5R, 4.7µF, 50V, 10%, 0805 MURATA, GRM21BR61H475KE51L

3 1 C3 CAP., X7R, 0.1µF, 16V, 10%, 0603 MURATA, GRM188R71C104KA01D

4 1 C5 CAP., X5R, 10µF, 25V, 20%, 0603 MURATA, GRM188R61E106MA73D

5 1 C10 CAP., X7R, 0.1µF, 50V, 10%, 0402 TDK, CGA2B3X7R1H104K050BB

6 2 R1, R5 RES., CHIP, 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA

7 1 R2 RES., CHIP, 60.4k, 1/10W, 1%, 0603 VISHAY, CRCW060360K4FKEA

8 1 R3 RES., CHIP, 41.2k, 1/10W, 1%, 0603 VISHAY, CRCW060341K2FKEA

9 1 U1 IC., BGA, 36L, 6.25mm × 6.25mm × 2.32mm LINEAR TECH., LTM8065EY#PBF

Additional Demo Board Circuit Components

1 0 C4, C11 (OPT) CAP., 0603

2 0 C6 (OPT) CAP., X7R, 4.7µF, 50V, 10%, 1206

3 0 C8 (OPT) CAP., X7R, 0.1µF, 50V, 10%, 0402

4 1 C9 CAP., ALUM, 22µF, 63V, 20% SUN ELECTRONIC INDUSTRIES CORP., 63CE22BS

5 0 L1 (OPT) IND, 2.2µH, 4.45mm ×4.06mm WURTH ELEKTRONIK, 74437324022

6 1 R4 RES., CHIP, 0, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

7 0 R6, R7, R8 (OPT) RES., 0603

Hardware: For Demo Board Only

1 10 E1-E6, E8-E11 TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

2 0 E7 (OPT) TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

3 1 JP1 HEADER 3 PIN 0.079 SINGLE ROW WURTH ELEKTRONIK, 62000311121

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

5 4 MH1-MH4 STAND-OFF, NYLON, 0.375" SNAP ON KEYSTONE, 8832

FREQUENCY (MHz)

0.5

1.5

2.5

3.5

4.5

–120

–100

–80

–60

–40

–20

INTENSITY (dBm)

DC2251A F05

dc2251af

DEMO MANUAL DC2251A

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

ALL CAPACITORS ARE 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 0603.

INPUT EMI FILTER

SEE DEMO MANUAL

OPTIONAL

VOUT

VIN_EMI

OPT

22uF

63V

63CE22BS

JP1

BURST

SYNC

TR/SS

4.7uF

50V

0805

E11

SYNC

60.4K

OPT

74437324022

Wurth Elektronik

2.2uH

LTM8065EY

GND

AUX

TR/SS

RUN

BIAS

SYNC

VOUT

VIN

GND

50V

1206

4.7uF

GND

BIAS

GND

VIN

6V - 40V

C11

OPT

VOUT

5V / 2.5A

100K

47uF

10V

0805

OPT

E10

GND

41.2K

C10

0.1uF

50V

0402

OPT

0.1uF

16V

RUN

50V

0402

0.1uF

OPT

10uF

25V

VIN

VOUT

VIN

VOUT

dc2251af

DEMO MANUAL DC2251A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 1017 • 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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