Linear Technology DC1987A Guida rapida alla configurazione

dc1987af

DEMO MANUAL DC1987A

Description

LTM8057

Isolated μModule DC/DC Converter

The Demo circuit 1987A is a 2kV AC isolated flyback

μModule

DC/DC converter featuring the LTM8057. The

demo circuit is designed for a 5V flyback output from a

4.5V to 29V input. The typical current capability of the 5V

flyback output varies with input voltage from about 110mA

at 4.5VIN to about 350mA at 29VIN. Figure 1 shows the

typical maximum output current on VOUT. R1 provides

the necessary minimum load current to keep the VOUT

in regulation throughout the entire input voltage range.

Please see the typical performance characteristic curves L, LT, LTC, LTM, Linear Technology, µModule and the Linear logo are registered trademarks of

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

in the LTM8057 data sheet to determine the minimum load

current for other input/output configurations.

The LTM8057 data sheet gives complete description of

the device, operation and application information. The

data sheet must be read in conjunction with this quick

start guide prior to using demo circuit 1987A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1987A

Figure 1. VOUT Typical Maximum Output Current vs VIN Figure 2. VOUT Output Noise Spectrum with IOUT

at 100mA and VIN at 12V

VIN (V)

OUTPUT CURRENT (mA)

400

300

200

350

250

150

100

10 1814 22 24

dc1987 F01

6 1612 20 288 26

FREQUENCY (MHz)

INTENSITY (dBm)

–80

–20

–40

–120

–60

–100

1.0 3.02.0 4.0

dc1987 F02

5.0

0.5 2.51.5 3.5 4.5

BoarD photo

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dc1987af

DEMO MANUAL DC1987A

Quick start proceDure

Demo circuit 1987A provides an easy method to evalu-

ate the performance of the LTM8057. 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 proper scope

probe technique.

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

and GND.

2. Turn on the power at the input.

NOTE. Make sure that the input voltage does not

exceed 29V.

3. Check for the proper output voltage. (For VOUT, check

the voltage between VOUT and VOUT–)

NOTE. If there is no output, temporarily disconnect the

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

4. Once the proper output voltages are established, adjust

the load within the operating range and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters.

performance summary

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage 4.5 V

Maximum Input Voltage 29 V

Output Voltage VOUT VIN = 4.5V – 29V 4.75 5.25 V

Voltage Ripple VOUT VIN = 12V, IOUT = 100mA 10 mV

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dc1987af

DEMO MANUAL DC1987A

Figure 4. Measuring Input or Output Ripple

Quick start proceDure

Figure 3. DC1987A Proper Equipment Setup

GNDVIN/VOUT

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dc1987af

DEMO MANUAL DC1987A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., CHIP, X5R, 10µF, 50V, 10% 1210 MURATA, GRM32ER71H106KA12L

2 1 C2 CAP., CHIP, X5R, 22µF, 16V, 10% 1206 AVX, 1206YD226KAT2A

3 1 C4 CAP., CHIP, X5R, 4.7µF, 50V, 20% 0805 TDK, C2012X5R1H475M

4 1 C6 CAP., CHIP, X7R, 0.1µF, 25V, 10% 0603 AVX, 06033C104KAT2A

5 1 R1 RES., CHIP, 200Ω, 1W, 1% 1210 VISHAY, CRCW1210200RFKEA

6 1 R2 RES., CHIP, 200k, 1/10W, 1% 0603 VISHAY, CRCW0603200KFKEA

7 1 R3 RES., CHIP, 90.9k, 1/10W, 1% 0603 VISHAY, CRCW060390K9FKEA

8 1 R5 RES., CHIP, 6.98k, 1/10W, 1% 0603 VISHAY, CRCW06036K98FKEA

9 1 U1 IC., LINEAR LTM8057EY#PBF LINEAR TECH., LTM8057EY#PBF

Additional Demo Board Circuit Components

1 0 C3 (OPT) CAP., 0603

2 1 C5 CAP., CHIP, X7R, 1µF, 16V, 10% 0603 AVX, 0603YC105KAT2A

3 0 C8 (OPT) CAP., 1210

4 1 CIN1 CAP., TANT. 10µF, 35V, CASE-C AVX, TAJC106K035R

5 0 C7 (OPT) CAP., 1808

6 0 L1 OPT.

7 0 R6 OPT. 0603

Hardware: For Demo Board Only

1 4 E1-E4 TESTPOINT, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0

1 2 E5, E8 TESTPOINT, TURRET, 0.064" MILL-MAX 2308-2-00-80-00-00-07-0

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dc1987af

DEMO MANUAL DC1987A

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

FOR INPUT VOLTAGE DAMPING PURPOSE ONLY.

0805

1206

OPT 5V

1. ALL RESISTORS ARE 0603.

ALL CAPACITORS ARE 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

** SEE QUICK START GUIDE FOR OUTPUT CURRENT RANGE.

4.5V - 29V VIN VIN

OPT

90.9k

0.1uF

25V

0.1uF

25V

LTM8057EY

RUN

GND

BIAS

VOUT A6

VIN

GND

VOUT- A2

VOUT- A3

VIN

GND

VOUT- A4

VOUT- A5

VOUT- B3

VOUT- B4

VOUT- B5

VOUT A7

VOUT B6

VOUT B7

VIN

VOUT- B2

VOUT- B1

VOUT- A1

ADJ

GND

E2 GND

GND

470pF

OPT

GA342QR7GD471KW01L

1808

470pF

OPT

GA342QR7GD471KW01L

1808

E4 VOUT-

OPT

1210

OPT

1210

RUN E5

RUN

6.98k

BIAS E8

BIAS

10uH

CDRH4D22/HP

10uH

CDRH4D22/HP

200

1210

200

1210

4.7uF

50V

4.7uF

50V

10uF

35V

CIN1

10uF

35V

CIN1 C1

10uF

1210

50V

10uF

1210

50V

200k

1uF

VOUT

22uF

16V

22uF

16V

GND E2

GND

VIN

OPT

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dc1987af

DEMO MANUAL DC1987A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0614 • 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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Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC1987A

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