Linear Technology LTM8027 Guida rapida alla configurazione

dc1307bf

DEMO MANUAL DC1307B

Description

LTM8027:

60V, 4A DC/DC

µModule

Regulator

Demonstration circuit 1307B features the LTM

8027

conﬁgured to deliver 12V from a 16V to 60V input. The

wide input range of the LTM8027 allows a variety of input

sources such as automotive batteries, wall adaptors and

industrial supplies. The LTM8027 is a step down converter,

so a minimum amount of headroom is required to keep

the output in regulation. A soft-start feature controls the

output voltage slewrate at start-up,reducing current surges

and voltage overshoots. The current mode control scheme

creates fast transient response and good loop stability.

perForMAnce sUMMArY

(TA= 25°C)

The LTM8027 data sheet gives a complete description of

the part, operation and application information. The data

sheet must be read in conjunction with this manual before

working on or modifying demo circuit 1307B.

Design ﬁles for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of

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

PARAMETER VALUE

Input Voltage Range 16V to 60V

Output Voltage VOUT 12V ±3%

Maximum Output Current 4A

Typical Switching Frequency 300kHz

DeMo BoArD photo

dc1307bf

DEMO MANUAL DC1307B

qUick stArt proceDUre

Demonstration circuit 1307B is an easy way to evaluate

the performance of the LTM8027. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below:

1. Place JP1 on the ON position.

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

and GND. Preset the power supply within the input

voltage range.

3. Connect the load and preset to 0A.

4. Turn on the power at the input.

5. Check for the proper output voltage.

6. Once the proper output voltages are established, adjust

the loads within the operating range and observe the

output voltage regulation, ripple voltage, efﬁciency and

other parameters.

Figure 1. Proper Measurement Equipment Setup

+–

–

LOAD

–

dc1307b F02

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DEMO MANUAL DC1307B

qUick stArt proceDUre

Figure 2. DC1307B Output Noise Spectrum (VIN = 24V, VOUT = 12V, IOUT = 4A)

-120

-100

-80

-60

-40

-20

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

INTENSITY (dBm)

FREQUENCY (MHz)

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DEMO MANUAL DC1307B

pArts list

ITEM QUANTITY REFERENCE DESCRIPTION MANUFACTURER’S PART NUMBER

Required Circuit Components

1 1 C5 Capacitor, COG, 1500pF, 100V, 5%, 0603 AVX, 06031A152JAT2A

2 1 C1 Capacitor, X5R, 2.2µF, 100V, 10%, 1210 TDK, C3225X5R2A225K

3 1 C2 Capacitor, X5R, 22µF, 16V, 20%, 1210 AVX, 1210YC226MAT2A

4 2 C3, C4 Capacitor, TQC, 68µF, 16V SANYO, 16TQC68M

5 1 R1 Resistor, Chip, 56.2k, 1/16W, 1%, 0603 Vishay, CRCW060356K2FKEA

6 1 R2 Resistor., Chip, 845k, 1/16W, 1%, 0603 Vishay, CRCW0603845KFKEA

7 1 R3 Resistor, Chip, 49.9k, 1/16W, 1%, 0603 Vishay, CRCW060349K9FKEA

8 1 R4 Resistor, Chip, 82.5k, 1/16W, 5%, 0603 Vishay, CRCW060382K5FKEA

9 1 U1 I.C., LTM8027EV#PBF, LGA,113-Pin Linear Technology, LTM8027EV#PBF

Additional Demo Board Circuit Components

1 1 CIN Capacitor, Aluminum, 22µF, 63V Sun Electronic, 63CE22BS

2 1 C6 Capacitor, X7R, 0.1µF, 50V, 10%, 0603 Murata, GRM188R71H104KA93D

3 0 C7 (Optional) Capacitor, Aluminum, 63V, 22µF

4 0 C8 (Optional) Capacitor, 1210

5 0 C9 (Optional) Capacitor, 1206

6 0 L2 (Optional) Inductor, 22µH Vishay, IHLP-4040DZER22R0M11

7 0 FB1 (Optional) Resistor, Chip, 1206

Hardware, for Demo Board Only

1 6 E1-E6 Testpoint, Turrent, .095” MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 2mm Single Row Header, 3-Pin Samtec, TMM-103-02-L-S

3 1 JP1 Shunt Samtec, 2SN-BK-G

4 4 E7-E10 Banana Jack Keystone, 575-4

5 4 (Stand-Off) Stand-Off, Nylon 0.50" Tall Keystone, 8833(Snap On)

dc1307bf

DEMO MANUAL DC1307B

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 representation

that the interconnection of its circuits as described herein will not infringe on existing patent rights.

scheMAtic DiAgrAM

D D

C C

A A

16V - 60V

12V @ 4A

OFF

100V

16V

50V

1206(OPT)

1206

1210

(OPT)

VIN

FB1 (OPT)FB1 (OPT)

68uF

16V

68uF

16V

E4 VOUT

1500pF

Cin

22uF

63V

Cin

22uF

63V

22uF

63V

22uF

63V

68uF

16V

68uF

16V

JP1JP1

GND E5

GND

0.1uF

LTM8027EV

VIN

GND

VOUT

BIAS1

GND

A10

GND

A11

GND

B10

GND

B11

GND

C10

GND

C11

GND

D10

GND

D11

GND

AUX

VOUT

E10

VOUT

E11

VOUT

F10

VOUT

F11

VOUT

G10

VOUT

G11

VOUT

H10

VOUT

H11

VOUT

J10

VOUT

J11

VOUT

K10

VOUT

K11

VOUT

L10

VOUT

L11

VIN

RUN

SYNC

BIAS2

ADJ

GND

E9 VOUT

VIN E7

VIN

E2 GND

E8 GND

SYNC E3

SYNC

(OPT)

49.9K

L2 IHLP-4040CZER-220MLL2 IHLP-4040CZER-220ML

82.5K

2.2uF

E10

GND E10

GND R1 56.2KR1 56.2K

22uF

E6 BIAS

VIN

2.2uF

845K

dc1307bf

DEMO MANUAL DC1307B

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 0313 • 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 direc-

tive 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

X-ON Electronics

Largest Supplier of Electrical and Electronic Components

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