Linear Technology DC2358A User manual

dc2358af

DEMO MANUAL DC2358A

DESCRIPTION

LTM8068

Isolated μModule DC/DC Converter

with LDO Regulator

The Demo Circuit 2358A is a 2kV AC isolated flyback

μModule

DC/DCconverterwithLDOpostregulatorfeatur-

ing the LTM8068. The demo circuit is designed for a 5.6V

flyback output and a 5V post regulator output from a 4.5V

to 40V input. The current capability of the 5.6V flyback

output varies with input voltage from about 200mA at

4.5VIN to about 460mA at 40VIN. The current capability of

the 5V LDO output is limited by either the current capabil-

ity of VOUT1 minus VOUT1 loading or the 300mA current

limit on the LDO post regulator itself. Figure 1 shows the

maximum output current on VOUT1 when VOUT2 is not

loaded, and VOUT2 when VOUT1 is unloaded. VOUT2 is the

LDO post regulator from VOUT1.

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.

The two-stage converterprovides an isolatedflyback output

as well as a low-noise LDO output. Figure 2 shows the

output noise spectrum on the flyback output and Figure

3 shows the output noise spectrum on the LDO output.

The LTM8068 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 for demo circuit 2358A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2358A

BOARD PHOTO

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DEMO MANUAL DC2358A

PERFORMANCE SUMMARY

PARAMETER CONDITIONS MIN TYP MAX UNITS

Minimum Input Voltage 4.5 V

Maximum Input Voltage 40 V

Output Voltage VOUT1 VIN = 4.5V to 40V 5.3 5.6 5.9 V

Output Voltage VOUT2 VIN = 4.5V to 40V 4.85 5 5.15 V

Voltage Ripple VOUT1 VIN = 12V, IOUT1 = 200mA, IOUT2 = 0mA 25 mV

Voltage Ripple VOUT2 VIN = 12V, IOUT1 = 0mA, IOUT2 = 200mA 1 mV

Demo circuit 2358A is easy to set up to evaluate the per-

formance of the LTM8068. 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. Measure the input or output voltage

ripple by touching the probe tip directly across the VIN

and GND or VOUT and VOUTN terminals. See Figure 5 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 40V.

3. Check for the proper output voltages. (For OUT1, check

the voltage between VOUT1 and VOUTN. For OUT2, check

the voltage between VOUT2 and VOUTN.)

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.

QUICK START PROCEDURE

Specifications are at TA= 25°C

Figure 1. Maximum Output Current vs

VIN: 5.6VOUT1 Flyback Output with VOUT2

Unloaded; 5VOUT2 LDO output with

VOUT1 Unloaded

Figure 2. VOUT1 Output Noise Spectrum

with IOUT1 at 200mA and VIN at 12V

(VOUT2 Has No Extra Load)

Figure 3. VOUT2 Output Noise Spectrum

with IOUT2 at 200mA and VIN at 12V

(VOUT1 Has No Extra Load)

VIN (V)

MAXIMUM LOAD CURRENT (mA)

500

100

300

400

200

dc2358 F01

2010 30

5.6VOUT1

5VOUT2

FREQUENCY (MHz)

INTENSITY (dBm)

–80

–40

–20

–60

–100 2.5 4.51.5 3.5

dc2358 F02

5.0

2.0 4.01.0 3.00.5

FREQUENCY (MHz)

INTENSITY (dBm)

–80

–40

–20

–60

–100 2.5 4.51.5 3.5

dc2358 F03

5.0

2.0 4.01.0 3.00.5

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DEMO MANUAL DC2358A

QUICK START PROCEDURE

Figure 4. DC2358A Proper Equipment Setup

Figure 5. Measuring Input or Output Ripple

INPUT OR OUTPUT CAPACITOR

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DEMO MANUAL DC2358A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP., ALUM, 22µF, 50V, 6.6x6.6mm NICHICON, UUD1H220MCL1GS

2 1 C1 CAP., CER., 10µF, X7R, 50V, 10%, 1210 MURATA, GRM32ER71H106KA12L

3 2 C2, C3 CAP., CER., 4.7µF, X5R, 10V, 10%, 0603 MURATA, GRM188R61A475KE15D

4 1 C4 CAP., CER., 47µF, X5R, 10V, 10%, 1206 MURATA, GRM31CR61A476KE15L

5 1 C5 CAP., CER., 22µF, X5R, 6.3V, 20%, 0805 MURATA, GRM21BR60J226ME39L

6 1 C8 CAP., CER., 0.01µF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E103KA01D

7 1 C10 CAP., CER., 10pF, NP0, 50V, 5%, 0603 MURATA, GRM1885C1H100JA01D

8 1 R1 RES, 200k, 1/10W, 1%, 0603 VISHAY, CRCW0603200KFKEA

9 1 R2 RES, 95.3k, 1/10W, 1%, 0603 VISHAY, CRCW060395K3FKEA

10 1 R3 RES, 7.32k, 1/10W, 1%, 0603 VISHAY, CRCW06037K32FKEA

11 1 R4 RES, 604Ω, 1/8W, 1%, 0805 VISHAY, CRCW0805604RFKEA

12 1 R5 RES, 162k, 1/10W, 1%, 0603 VISHAY, CRCW0603162KFKEA

13 1 U1 I.C., LTM8068EY#PBF 9 × 11.25 × 4.92 BGA LINEAR TECH., LTM8068EY#PBF

Additional Demo Board Circuit Components

1 0 C6 (OPT) CAP., 1210 (OPT)

2 0 C7 (OPT) CAP., 0805 (OPT)

3 0 C9 (OPT) CAP., 1808 (OPT)

4 0 L1 (OPT) IND., 10µH, XFL3012 (OPT)

Hardware: For Demo Board Only

1 6 E1-E6 TESTPOINT, TURRET, 0.094" pbf MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 E7 TEST POINT, TURRET, 0.064" MTH HOLE MILL-MAX, 2308-2-00-80-00-00-07-0

3 4 MH1-MH4 STAND-OFF, NYLON 0.375" SNAP ON KEYSTONE, 8832

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dc2358af

DEMO MANUAL DC2358A

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

4.5V - 40V

FOR INPUT VOLTAGE DAMPING PURPOSE ONLY.

5.6V

1. ALL RESISTORS ARE 0603.

ALL CAPACITORS ARE 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

** SEE QUICK START GUIDE FOR OUTPUT CURRENT RANGE.

VINVIN

GND

VOUT1

162k

604

0805

OPT

1206

200k

4.7uF

10V

10uF

1210

50V

C10

10pF C9

OPT

1808

VIN

47uF

10V

1206

0.01uF

25V

RUN

4.7uF

10V

22uF

50V

CIN1

22uF

E4 VOUTN

VOUT2

OPT

LTM8068EY

RUN

GND

VOUT1 A6

GND

VIN

GND

FB2 A2

VOUTN A3

VIN

GND

VOUTN A4

VOUTN A5

VOUTN B3

VOUTN B4

VOUTN B5

VOUT1 A7

VOUT1 B6

VOUT1 B7

VIN

BYP B2

VOUT2 B1

VOUT2 A1

FB1

GND

E2 GND

GND

95.3k

E6 VOUTN

7.32k

22uF

6.3V

0805

OPT

0805

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dc2358af

DEMO MANUAL DC2358A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0216 • 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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