Analog Devices Linear Technology DC2328A Quick setup guide

dc2328af

DEMO MANUAL DC2328A

Description

LTM4651

EN55022B Compliant 58V, 24W

Inverting-Output DC/DC µModule Regulator

Demonstration circuit 2328A is an inverting buck-boost

converter with 12V to 34V input voltage, –24V output volt-

age and max 2A output current capability, which features

the LTM

4651Y. The LTM4651 is an ultralow noise, 58V,

24W inverting-topology DC/DC µModule regulator. It is

designed to meet the radiated emissions requirement of

EN55022B. A switching frequency range of 250kHz to

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

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

performance summary

BoarD photo

3MHz is supported and the module can synchronize to

an external clock. The LTM4651 data sheet must be read

in conjunction with this demo manual prior to working on

or modifying demo circuit DC2328A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2328A

Specifications are at TA= 25°C

DC2328A Top View

PARAMETER CONDITIONS VALUE

Input Voltage Range 12V to 34V

Output Voltage, VOUT 12VIN, 0A to 1A; 24VIN, 0A to 2A; 34VIN, 0A to 2A –24V ±2%

Maximum Output Current, IOUT Derating for Certain VIN and Thermal Conditions 2A

Default Operating Frequency 1.2MHz

Efficiency 24VIN, –24VOUT, 2A 87.5%

dc2328af

DEMO MANUAL DC2328A

Quick start proceDure

Demonstration circuit 2328A is easy to set up to evaluate

the performance of the LTM4651Y. Refer to Figure 1 for

the proper measurement equipment setup and follow the

procedure below:

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

(12V to 34V) and GND (input return).

2. Connect the – 24V output load between VOUT ( –) and

GND (+) (Initial load: no load).

3. Connect the DVMs to the input and output. Set the

default jumper position, JP2: ON.

4. Turn on the input power supply and check for the

proper output voltages. VOUT should be –24V ±2%.

5. Once the proper output voltages are established, adjust

the loads within the operating range and observe the

output voltage regulation, ripple voltage and other

parameters.

Note:When measuring the output or input voltage

ripple, do not use the long ground lead on the oscil-

loscope probe. See Figure 2 for the proper scope probe

technique. Short, stiff leads need to be soldered to

the (+) and (–) terminals of an output capacitor. The

probe’s ground ring needs to touch the (–) lead and

the probe tip needs to touch the (+) lead.

Figure1. Proper Measurement Equipment Setup

Figure2. Measuring Output Voltage Ripple

DC2328 F01

LOAD

VIN

12V TO 34V

+–

IOUT

SHUNT

10mΩ

IIN

SHUNT

10mΩ

+–

–

VIN

–

VOUT

–

+ –

VOUT GND

COUT

dc2328af

DEMO MANUAL DC2328A

Quick start proceDure

Figure3. Efficiency vs Load Current (VOUT = –24V) Figure4. Efficiency vs Load Current (VOUT = –12V)

LOAD CURRENT (A)

EFFICIENCY (%)

DC2328A F03

55.0

60.0

65.0

70.0

75.0

80.0

85.0

90.0

95.0

0.0 2.52.01.51.00.5

12VIN

24VIN

34VIN

LOAD CURRENT (A)

0.5

1.5

2.5

3.5

EFFICIENCY (%)

DC2328 F04

5VIN, 475kHz

12VIN, 825kHz

24VIN, 1.1MHz

36VIN, 1.2MHz

Optional –12VOUT

Besides the default –24V output voltage which shows the

full capacity of LTM4651, it is very easy to customize

the DC2328A demo board to make other negative output

voltages available. As an example, to implement –12VOUT

with 5V – 36V VIN,

1. Change R4 from 14k to 39k. This sets the minimum

operation input voltage, 5V for this case.

2. Change R1 and R8 from 240k to 121k. This sets the

output voltage, –12V for this case.

Check the input and output capacitor voltage rating.

And then it is done.

However, to maximize the efficiency of the regulator for

different input voltage, the switching frequency can be

adjusted by changing R13. For the recommended switch-

ing frequency for given input voltage and given output

voltage, please refer to the LTM4651 data sheet.

The results for the –12VOUT are listed below.

For 5V

, change R13 from 124k to 1.3MΩ. The switching

frequency will be 475kHz. For 12VIN, change R13 from

124k to 237k. The switching frequency will be 825kHz.

For 24VIN, change R13 from 124k to 143k. The switch-

ing frequency will be 1.1MHz. For 36VIN, keep the default

R13. The switching frequency will be 1.2MHz.

The optimized efficiency for –12VOUT is as shown in

Figure4.

dc2328af

DEMO MANUAL DC2328A

Figure6. 0A ←→ 2A Load Transients

(VIN = 24V, VOUT = –24V)

Figure7. 0A ←→ 2A Load Transients

(VIN = 34V, VOUT = –24V)

1ms/DIV

VOUT (AC)

200mV/DIV

IOUT

1A/DIV

VIN

10V/DIV

DC2328 F06

1ms/DIV

VOUT (AC)

200mV/DIV

IOUT

1A/DIV

VIN

10V/DIV

DC2328 F07

Figure5. 0A ←→ 1A Load Transients

(VIN = 12V, VOUT = –24V)

1ms/DIV

VOUT (AC)

200mV/DIV

IOUT

1A/DIV

VIN

10V/DIV

DC2328 F05

Quick start proceDure

Figure8. Output Voltage Ripple

(VIN = 12V, VOUT = –24V, 1A Load)

Figure9. Output Voltage Ripple

(VIN = 24V, VOUT = –24V, 2A Load)

Figure10. Output Voltage Ripple

(VIN = 34V, VOUT = –24V, 2A Load)

500ns/DIV

VOUT (AC)

20mV/DIV

VSW

10V/DIV

DC2328 F08

500ns/DIV

VOUT (AC)

50mV/DIV

VSW

20V/DIV

DC2328 F09 500ns/DIV

VOUT (AC)

50mV/DIV

VSW

20V/DIV

DC2328 F10

dc2328af

DEMO MANUAL DC2328A

AMPLITUDE (dBµV/m)

–10

FREQUENCY (MHz)

30 830

130 230 330 430 530 630 730 930 1000

DC2328 F11

[1] HORIZONTAL

[2] VERTICAL

QPK LIMIT

FORMAL

MEAS DIST 10m

SPEC DIST 10m

AMPLITUDE (dBµV/m)

–10

FREQUENCY (MHz)

30 830

130 230 330 430 530 630 730 930 1000

DC2328 F12

[1] HORIZONTAL

[2] VERTICAL

QPK LIMIT

FORMAL

MEAS DIST 10m

SPEC DIST 10m

AMPLITUDE (dBµV/m)

–10

FREQUENCY (MHz)

30 830

130 230 330 430 530 630 730 930 1000

DC2389 F13

[1] HORIZONTAL

[2] VERTICAL

QPK LIMIT

FORMAL

MEAS DIST 10m

SPEC DIST 10m

Figure11. Radiated Emissions Scan of the LTM4651. Producing –24VOUT at 1A, from 12VIN.

DC2328A Hardware. fSW = 1.2MHz. Measured in a 10m Chamber. Peak Detect Method

Figure12. Radiated Emissions Scan of the LTM4651 Producing –24VOUT at 2A, from 25VIN.

DC2328 Hardware. fSW = 1.2MHz. Measured in a 10m Chamber. Peak Detect Method

Figure13. Radiated Emissions Scan of the LTM4651. Producing –24V at 2A, from 34V.

DC2328A Hardware. fSW = 1.2MHz. Measured in a 10m Chamber. Peak Detect Method

dc2328af

DEMO MANUAL DC2328A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 5 C1, C3, C8, C25, C28 CAP., X7R, 4.7µF, 80V, 10%, 1210 MURATA, GRM32ER71K475KE14L

2 6 C2, C4, C5, C6, C16, C17 CAP., X7R, 10µF, 50V, 10%, 1210 MURATA, GRM32ER71H106KA12L

3 0 C19, C20, C21, C22, C23 CAP., OPT, 1210 OPT

4 1 C7 CAP., ALUM., 100µF, 40V, 10x10.5 SUN ELECTRONIC, 40HVP100M

5 1 C9 CAP., X7R, 0.1µF, 100V, 10%, 0805 MURATA, GRM21BR72A104KAC4K

6 1 C10 CAP., X7R, 1µF, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L

7 1 C11 CAP., X7R, 4.7nF, 50V, 10%, 0603 MURATA, GRM188R71H472KA01D

8 1 C12 CAP., X7R, 3.3nF, 50V, 10%, 0603 MURATA, GRM188R71H332KA01D

9 1 C13 CAP., X7R, 100nF, 50V, 10%, 0603 MURATA, GRM188R71H104KA93D

10 0 C15 CAP., OPT, 10X10.2 OPT

11 0 C18 CAP., OPT, 0805 OPT

12 0 C24 CAP., OPT, 0603 OPT

13 1 C26 CAP., OS-CON., 82µF, 35V, 8x11.9 PANASONIC, 35SVPF82M

14 1 C27 CAP., X5R, 1µF, 25V, 10%, 0603 MURATA, GRM188R61E105KA12D

15 0 D1 DIODE, OPT, SOT23 OPT

16 0 D2 DIODE, OPT, SMA OPT

17 5 E1-E5 TESTPOINT, TURRET, .061" MILL-MAX, 2308-2-00-80-00-00-07-0

18 8 E6-E13 TESTPOINT, TURRET, .094" MILL-MAX, 2501-2-00-80-00-00-07-0

19 0 JP1 HEADER, OPT OPT

20 1 JP2 HEADER, 1X3, 0.079 WURTH ELEKTRONIK, 62000311121

21 6 J1, J2, J3, J4, J5, J6 JACK, BANANA KEYSTONE, 575-4

22 0 L1 IND, OPT, 1206 OPT

23 0 L2 IND, OPT, IHLP3232CZ-01 OPT

24 2 R1, R8 RES., 240k, 0.1%, 0603 PANASONIC, ERA3AEB244V

25 1 R2 RES., 332Ω, 1%, 0603 VISHAY, CRCW0603332RFKEA

26 1 R3 RES., 102k, 1%, 0603 VISHAY, CRCW0603102KFKEA

27 1 R4 RES., 14k, 1%, 0603 VISHAY, CRCW060314K0FKEA

28 3 R5, R10, R20 Res., 10Ω, 1%, 0603 VISHAY, CRCW060310R0FKEA

29 0 R7, R9, R12, R14, R19, R22, R23, R24 RES., OPT, 0603 OPT

30 1 R13 RES., 124k, 1%, 0603 VISHAY, CRCW0603124KFKEA

31 1 R18 RES., 0Ω, 1%, 0603 VISHAY, CRCW06030000Z0EA

32 1 U1 I.C., LTM4651EY, BGA77-15X9X5.01 LINEAR TECH., LTM4651EY#PBF

33 1 XJP2 SHUNT, 0.079" CENTER WURTH ELEKTRONIK, 60800213421

34 4 (STAND-OFF) STAND-OFF, NYLON 0.50" WURTH ELEKTRONIK, 702935000

35 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT, 2328A

36 2 STENCILS TOP AND BOTTOM STENCIL DC2328A

dc2328af

DEMO MANUAL DC2328A

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

0.1%

35V

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603.

0.1%

40V

8X11.9

10X10.5

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, May 12, 2017

LOW EMI INVERTING BUCK-BOOST

JEOFERRY W.

N/A

LTM4651EY

DEMO CIRCUIT 2328A

MODULE REGULATOR

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, May 12, 2017

LOW EMI INVERTING BUCK-BOOST

JEOFERRY W.

N/A

LTM4651EY

DEMO CIRCUIT 2328A

MODULE REGULATOR

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, May 12, 2017

LOW EMI INVERTING BUCK-BOOST

JEOFERRY W.

N/A

LTM4651EY

DEMO CIRCUIT 2328A

MODULE REGULATOR

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION

4 05-12-17

JEOFFERY W.

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION

4 05-12-17

JEOFFERY W.

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION

4 05-12-17

JEOFFERY W.

LTM4651EY

SVIN C3

VD A4

VD B4

RUN

VOUT-

VIN A1

VIN A2

VIN A3

VIN B3

VD C4

VOUT-

J4 VOUT-

VOUT-

SW H4

PGND K1

PGND K2

PGND K3

PGND L1

PGND L2

PGND L3

GNDSNS H1

GNDSNS G1

SVOUT- H2

SVOUT- G2

SVOUT- E4

PGDFB D2

PGOOD D1

GND

TEMP+

TEMP-

J7 NC A6

NC A7

NC B6

NC B7

NC C6

NC C7

NC D6

NC D7

NC E6

NC E7

NC F6

NC F7

NC G6

NC G7

NC H6

NC H7

NC K6

NC K7

NC L6

NC L7

NC B2

EXTVCC

INTVCC

CLKIN

ISETa

ISETb

COMPa

COMPb

VINREG

FSET

VOUT-

4.7uF

80V

1210

240K

14K

VOUT

CLKIN

10uF

50V

1210

332

E12

TEMP+

R9 OPT

OPT

C17

10uF

50V

1210

R14

OPT

R19

OPT

E5 VEMI

JP1 OPT

100uF

240K

C24

OPT

R10

SGND

PGOOD

C16

10uF

50V

1210

C18

OPT

50V

0805

C25

4.7uF

80V

1210

C20

OPT

1210

E4 VOUT

10uF

50V

1210

E3 GND_TEST

10uF

50V

1210

C21

OPT

1210

R12

OPT

C15

OPT

R24

OPT

4.7uF

80V

1210

R18

GND

R22

OPT

E11

INTVCC

C13 100nF J2

GND

C23

OPT

50V

1210

VEMI

102K

10uF

50V

1210

E13

TEMP-

C27

1uF

0.1uF

100V

0805

E10

SVIN

C19

OPT

50V

1210

VIN

12V - 34V

JP2

OFF ON

RUN

C12 3.3nF

R23

OPT

R20

C10

1uF

50V 0805

C28

4.7uF

80V

1210

C11 4.7nF

E1 VIN

OPT

E2 GND

OPT

1206

OPT

IHLP-3232CZ-01

GND

-24V/2A MAX

C26

82uF

R13 124k

4.7uF

80V

1210

R7 OPT

RUN C22

OPT

50V

1210

CLKIN

INTVCC

VIN

RUN

EXTVCC

CLKIN

PGOOD

RUN

SGND

VINREG

SVIN

TEMP+

TEMP-

TEMP+

SGND

INTVCC

SGND

PGOOD

VOUT-

SVIN

VINREG

EXTVCC

SGND

VOUT-

SVOUT-

VIN

SVOUT-

INTVCC

VOUT- VOUT-

dc2328af

DEMO MANUAL DC2328A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0617 • 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

Mouser Electronics

Authorized Distributor

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

Analog Devices Inc.:

DC2328A

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