Linear Technology Analog Devices DC2728A Quick setup guide

DEMO MANUAL DC2728A

Rev. 0

DESCRIPTION

LTC7880

High Voltage Dual Step-up DC/DC Converter

with Digital Power System Management

Demonstration circuit 2728A is a high voltage, dual output

boost converter with 12V to 24V input range. The output

voltage is adjustable from V

to 48V. Each output can

supply 5A maximum load current. The demo board has a

LTC

7880 controller, which is a 60V dual output step-up

controller with digital power system management. Please

see LTC7880 data sheet for more detailed information.

DC2728A powers up to default settings and produces

power based on configuration resistors or its nonvola-

tile memory (NVM) without the need for any serial bus

communication. This allows easy evaluation of the DC/

DC converter. To fully explore the extensive power sys-

tem management features of the part, download the GUI

All registered trademarks and trademarks are the property of their respective owners.

BOARD PHOTO

software LTpowerPlay

onto your PC and use ADI’s I2C/

SMBus/PMBus dongle DC1613A to connect to the board.

LTpowerPlay allows the user to reconfigure the part on-

the-fly and store the configuration in EEPROM, view

telemetry of voltage, current, temperature and fault status.

GUI Download

The software can be downloaded from:

LTpowerPlay

For more details and instructions of LTpowerPlay, please

refer to LTpowerPlay GUI for LTC7880 Quick Start Guide.

Design files for this circuit board are available.

Figure1. Dual Output LTC7880/DC2728A Demo Circuit

DEMO MANUAL DC2728A

Rev. 0

Demonstration circuit 2728A is easy to set up to evaluate

the performance of the LTC7880. Refer to Figure2 for

the proper measurement equipment setup and follow the

procedure below.

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

(12V to 24V) and GND (input return). Make sure the

input power supply is capable of 35A at 12V.

2. Connect the 24V output load between VOUT0 and GND

(Initial Load: no load).

3. Connect the 48V output load between VOUT1 and GND

(Initial Load: no load).

4. Connect the DVMs to the input and outputs. Set default

jumper position:SW1:ON;SW2:ON; JP1: OFF; JP2:

NC; JP3: NC.

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

proper output voltages. VOUT0 should be 24V ± 0.5%,

and VOUT1 should be 48V ± 0.5%.

PARAMETER CONDITIONS VALUE

Input Voltage Range 12V to 24V

Output Voltage, VOUT0 VIN = 12V to 24V, IOUT0 = 0A to 5A 24V to 48V, Default: 24V

Maximum Output Current, IOUT0 VIN = 12V to 24V, VOUT0 = 24V to 48V 5A

Output Voltage, VOUT1 VIN = 12V to 24V, IOUT1 = 0A to 5A 24V to 48V, Default: 48V

Maximum Output Current, IOUT1 VIN = 12V to 24V, VOUT1 = 24V to 48V 5A

Typical Efficiency of CH0 VIN =12V, VOUT0 = 24V, IOUT0 = 5A 98.1% (See Figure5)

Typical Efficiency of CH1 VIN = 12V, VOUT1 = 48V, IOUT1 = 5A 97.1% (See Figure6)

Default Switching Frequency 150kHz

6. 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.

7. Connect the dongle and control the output voltages

from the GUI. See the LTpowerPlay GUI for the LTC7880

Quick Start Guide for details.

NOTE:When measuring the output or input voltage

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

loscope probe. See Figure3 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.

QUICK START PROCEDURE

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

DEMO MANUAL DC2728A

Rev. 0

Figure2. Proper Measurement Equipment Setup

Figure3. Proper Measurement Equipment Setup

OUT

GND

QUICK START PROCEDURE

DEMO MANUAL DC2728A

Rev. 0

Connecting a PC to DC2728A

You can use a PC to reconfigure the power management

features of the LTC7880 such as:nominal VOUT, mar-

gin set points, OV/UV limits, temperature fault limits,

sequencing parameters, the fault log, fault responses,

GPIOs and other functionalities. The DC1613A dongle

may be plugged when VIN is present.

LOAD CURRENT (A)

95.0

95.5

96.0

96.5

97.0

97.5

98.0

98.5

99.0

99.5

100.0

EFFICIENCY (%)

dc2728a F05

VOUT0 = 24V

LOAD CURRENT (A)

95.0

95.5

96.0

96.5

97.0

97.5

98.0

98.5

99.0

99.5

100.0

EFFICIENCY (%)

dc2728a F06

VOUT1 = 48V

Figure4. Demo Setup with PC

Figure5. Efficiency vs Load Current on CH0 (CH1 is Disabled) Figure6. Efficiency vs Load Current on CH1 (CH0 is Disabled)

QUICK START PROCEDURE

DEMO MANUAL DC2728A

Rev. 0

Figure7. VOUT0 Load Transient Response at VIN = 12V, VOUT0 = 24V Figure8. VOUT1 Load Transient Response at VIN = 12V, VOUT1 = 48V

Figure9. VOUT0 Voltage Ripple at VIN = 12V, VOUT0 = 24V, IOUT0 = 5A Figure10. VOUT1 Voltage Ripple at VIN = 12V, VOUT1 = 48V, IOUT1 = 5A

Figure11. Thermal at VIN =12V, VOUT0 = 24V, IOUT0 = 5A, VOUT1 = 48V, IOUT1 = 5A, TA= 25°C, No Airflow

500μs/DIV dc2728A F07

VOUT0

20MHz BW

200mV/DIV

0A TO 1.25A

LOAD STEP

500μs/DIV dc2728A F08

VOUT1

20MHz BW

200mV/DIV

0A TO 1.25A

LOAD STEP

10μs/DIV dc2728A F09

VOUT0

20MHz BW

200mV/DIV

10μs/DIV dc2728A F10

VOUT1

20MHz BW

500mV/DIV

QUICK START PROCEDURE

DEMO MANUAL DC2728A

Rev. 0

Figure12. LTpowerPlay Main Interface

LTpowerPlay is a powerful Windows-based development

environment that supports Analog Devices power sys-

tem management ICs and μModule

products, including

LTM4675, LTM4676, LTM4677, LTM4678, LTM4680,

LTM4700, LTM4664, LTC3880, LTC3882, LTC3883,

LTC3884 and LTC7880. The software supports a variety

of different tasks. You can use LTpowerPlay to evaluate

Analog Devices ICs by connecting to a demo board sys-

tem. LTpowerPlay can also be used in an offline mode

(with no hardware present) in order to build a multichip

configuration file that can be saved and reloaded at a later

time. LTpowerPlay provides unprecedented diagnostic

and debug features. It becomes a valuable diagnostic tool

during board bring-up to program or tweak the power

management scheme in a system, or to diagnose power

issues when bringing up rails. LTpowerPlay utilizes the

DC1613A USB-to-SMBus controller to communicate

with one of many potential targets, including LTM4675,

LTM4676, LTM4677, LTM4678, LTM4680, LTM4700,

LTM4664, LTC3880, LTC3882, LTC3883, LTC3884 and

LTC7880’s demo system, or a customer board. The soft-

ware also provides an automatic update feature to keep

the software current with the latest set of device drivers

and documentation. The LTpowerPlay software can be

downloaded from:

LTpowerPlay

To access technical support documents for ADI Digital

Power Products visit the LTpowerPlay Help menu. Online

help also available through the LTpowerPlay.

LTPOWERPLAY SOFTWARE GUI

DEMO MANUAL DC2728A

Rev. 0

LTPOWERPLAY QUICK START PROCEDURE

The following procedure describes how to use LTpowerPlay

to monitor and change the settings of LTC7880.

1. Download and install the LTPowerPlay GUI:

LTpowerPlay

2. Launch the LTpowerPlay GUI.

a. The GUI should automatically identify the DC2728A. The

system tree on the left-hand side should look like this:

b. A green message box shows for a few seconds in the

lower left hand corner, confirming that LTC7880 is

communicating:

c. In the Toolbar, click the “R” (RAM to PC) icon to read the

RAM from the LTC7880. This reads the configuration

from the RAM of LTC7880 and loads it into the GUI.

d. If you want to change the output voltage to a differ-

ent value, like 36V. In the Config tab, type in 36 in the

VOUT_COMMAND box, like this:

Then, click the “W” (PC to RAM) icon to write these

you will see the output voltage will change to 36V.

If the write is successful, you will see the following

message:

e. You can save the changes into the NVM. In the tool bar,

click “RAM to NVM” button, as following:

f. Save the demo board configuration to a (*.proj) file.

Click the Save icon and save the file. Name it whatever

you want.

DEMO MANUAL DC2728A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, C85 CAP., 330μF, HYBRID, 35V, 20%, SMD PANASONIC, EEHZK1V331P

2 3 C3, C37, C38 CAP., 2.2μF, X5R, 50V, 10%, 0603 MURATA, GRM188R61H225KE11D

3 4 C4, C5, C27, C33 CAP., 0.01μF, X7R, 100V, 10%, 0603 AVX, 06031C103KAT2A

4 3 C6, C13, C28 CAP., 0.001μF, X7R, 100V, 10%, 0603 AVX, 06031C102KAT2A

5 2 C9, C23 CAP., 0.1μF, X7R, 100V, 10%, 0603 AVX, 06031C104KAT2A

6 8 C10-C12, C24-C26, C88, C93 CAP., 4.7μF, X7S, 100V, 10%, 1210 TDK, C3225X7S2A475K200AB

7 8 C14, C15, C16, C17, C29, C30, C31, C32 CAP., 68μF, ALUM. ELECT., 63V, 20%, 10mm ×

10.2mm SMD, AEC-Q200

PANASONIC, EEHZC1J680P

8 2 C18, C34 CAP., 0.0047μF, X7R, 50V, 10%, 0603 SAMSUNG, CL10B472KB8NNNC

9 2 C20, C36 CAP., 100pF, C0G, 50V, 5%, 0603 AVX, 06035A101JAT2A

10 2 C39, C40 CAP., 4.7μF, X5R, 35V, 10%, 0603 MURATA, ZRB18AR6YA475KE05L

11 1 C77 CAP., 1000pF, C0G, 100V, 5%,0805 MURATA, GRM2195C2A102JA01D

12 8 C94, C95, C104-C109 CAP., 22μF, 20%, 35V, JB, 1206 TDK, C3216JB1V226M160AC

13 3 D1, D2, D15 DIODE, SCHOTTKY, 100V, 1A, POWER DI-123, AEC-Q101 DIODES, INC., DFLS1100-7

14 2 L1, L2 IND., 6.8μH, HIGH CURRENT, 10%, 30A, 2.06mΩ, 2815 SMD COILCRAFT, SER2915H-682KL

15 4 Q1, Q2, Q5, Q6 MOSFET, N-CH, 60V, 64A, PG-TDSON-8 INFINEON, BSC065N06LS5ATMA1

16 4 Q3, Q4, Q7, Q8 MOSFET, N-CH, 60V, 100A, PG-TDSON-8 INFINEON, BSC027N06LS5ATMA1

17 2 Q9, Q10 MOSFET, PNP, 40V, 0.2A, SC70-3 DIODES, INC., MMST3906-F

18 1 R2 RES., 0.003Ω, 1%, 1W, 2010 PANASONIC, ERJMP3MF3M0U

19 2 R3, R4 RES., 1k, 5%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06031K00JNEA

20 9 R10, R11, R13, R15, R16, R18, R23,

R25, R28

RES., 10k,5%, 1/10W, 0603 VISHAY, CRCW060310K0JNEA

21 2 R12, R38 RES, 2Ω, 5%, 1/10W, 0603 VISHAY CRCW06032R00JNEA

22 1 R14 RES., 0.003Ω, 1%, 3W, 2512 PANASONIC, ERJMP4QF3M0U

23 10 R17, R21, R22, R30, R43-R45, R175,

R177, R178

RES., 0Ω, 1/10W, 0603 VISHAY CRCW06030000Z0EA

24 4 R24, R26, R50, R51 RES., 10Ω, 5%, 1/10W, 0603 VISHAY CRCW060310R0JNEA

25 1 R37 RES., 0.002Ω, 1%, 3W, 2512 PANASONIC, ERJMP4QF2M0U

26 1 R92 RES.,1.0Ω, 5%, 1/2W, 0805 PANASONIC, ERJ6DQJ1R0V

27 1 U1 IC, 60V DUAL OUTPUT STEP-UP CONTROLLER WITH

PSM, 52-LEAD (7mm × 8mm), QFN

ADI., LTC7880IUKG#PBF

Additional Demo Board Circuit Components

1 0 C19, C35, C71, C73 OPT, 0603

2 2 C70, C103 CAP., 1.0μF, X7S, 100V, 10%, 0805 MURATA, GRJ21BC72A105KE11L

3 1 C72 CAP., 0.047μF, X7R, 25V, 10%, 0603 AVX, 06033C473KAT2A

4 1 C74 CAP., 2.2μF, X7R, 100V, 10%, 1210 AVX, 12101C225KAT2A

5 0 C75 OPT, 1210

6 1 C76 CAP., 0.1μF, X7R, 100V, 10%, 0603 AVX, 06031C104KAT2A

7 1 C78 CAP., 0.22μF, X7R, 100V, 10%, 0805 MURATA, GRM21AR72A224KAC5L

DEMO MANUAL DC2728A

Rev. 0

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

8 2 C79, C80 CAP., 100μF, X5R, 16V, 20%, 1210 TAIYO YUDEN, EMK325ABJ107MM-T

9 1 C81 CAP., 220pF, X7R, 50V, 10%, 0603 AVX, 06035C221KAT2A

10 2 C82, C83 CAP., 0.01μF, X7R, 100V, 10%, 0603 AVX, 06031C103KAT2A

11 1 C84 CAP., 0.1µF, 20%, 25V, X5R, 0603 AVX, 06033D104KAT2A

12 0 C86, C87 OPT, 10mm × 10.2mm

13 1 C110 CAP., 1μF, X5R, 50V, 10%, 0603 MURATA, GRT188R61H105KE13D

14 2 D5, D6 LED, GREEN, COLORLESS DIFFUSED, 0603 OSRAM, LS L29K-G2J1-24-Z

15 3 D7, D16, D17 LED, RED, COLORLESS DIFFUSED, 0603 OSRAM, LS L29K-H1J2-1-Z

16 3 D8, D9, D12 OPT

17 1 L5 IND., 68μH, PWR, ±30%, 1.65A, 201mΩ, SMD

10.5mm × 10.3mm × 5.1mm

SUMIDA, CDRH105RNP-680NC

18 1 Q19 MOSFET, N-CH 80V TO-263 INFINEON, IPB031N08N5

19 3 Q20, Q30, Q31 MOSFET, P-CH, 20V, 5.9A, SOT-23, TO-236 VISHAY, SI2365EDS-T1-GE3

20 2 Q22, Q23 MOSFET, N-CHAN,60V,115mA,SOT-23 FAIRCHILD SEMI., 2N7002

21 0 Q27 OPT, SOT23

22 0 R5, R6 OPT,2512

23 0 R19, R20, R29, R31-R36, R39-R42,

R46-R48, R49, R100-R105, R108, R110,

R111, R116-R118, R121, R144, R145,

R147, R148, R169, R173, R176, R183,

R184

OPT, 0603

24 2 R87, R88 RES., 200Ω, 5%, 1/10W, 0603 VISHAY CRCW0603200RJNEA

25 4 R89, R97, R112, R113 RES., 10k, 5%, 1/10W, 0603 VISHAY, CRCW060310K0JNEA

26 0 R90 OT, 0805

27 1 R91 RES., 1Ω, 1%, 1W, 2010, SENSE, AEC-Q200 WELWYN COMPONENTS/TT ELECT.,

LRC-LR2010-01-1R00-F

28 3 R93, R179, R180 RES., 127Ω, 1%, 1/10W, 0603 VISHAY CRCW0603127RFKEA

29 1 R96 RES., 127k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ-3EKF1273V

30 3 R98, R106, R109, R132, R174 RES., 0Ω, 1/10W, 0603 VISHAY CRCW06030000Z0EA

31 1 R99 RES., 220k, 5%, 1/10W, 0603 VISHAY CRCW0603220KJNEA

32 0 R107, R163 OPT, 1206

33 2 R114, R115 RES., 10Ω,5%, 1/10W, 0603 VISHAY CRCW060310R0JNEA

34 2 R119, R120 RES., 4.99k, 1%, 1/10W, 0603 VISHAY CRCW06034K99FKEA

35 1 R146 RES., 4.7Ω, 1%, 1/8W, 0805 VISHAY, CRCW08054R70FKEA

36 1 R157 RES, 2Ω, 5%, 1/10W ,0603 VISHAY CRCW06032R00JNEA

37 2 R162, R185 RES, 0Ω, JUMPER 1206 VISHAY CRCW12060000Z0EA

38 1 U3 IC, SYNCHR. STEP-DOWN CONVERTER, MSOP-16 ANALOG DEVICES,

LTC3630EMSE#PBF

39 1 U4 IC, MEMORY, EEPROM, 2Kb (256×8), TSSOP-8, 400kHz MICROCHIP, 24LC025-I/ST

PARTS LIST

DEMO MANUAL DC2728A

Rev. 0

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Hardware: For Demo Board Only

1 27 E1-E8, E11, E14, E18, E20-E27, E29,

E30, E32, E35-E40

TEST POINT, TURRET, 0.094, MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

2 3 JP1, JP2, JP3 CONN.,HDR,MALE,1×3, 2mm, THT, STR WURTH ELEKTRONIK, 62000311121

3 2 J1, J2 STUD, FASTENER, #10-32 PENNENGINEERING, KFH-032-10ET

4 4 J1, J2 x2 NUT, BRASS 10-32 ANY, 10-32M/S BR PL

5 2 J1, J2 RING, LUG #10 KEYSTONE, 8205

6 2 J1, J2 WASHER, TIN PLATED BRASS #10 ANY, #10EXT BZ TN

7 4 J3, J4, J5, J6 CONN.,BANANA JACK, FEMALE, THT, NON-

INSULATED, SWAGE

KEYSTONE, 575-4

8 3 J7, J12, J13 CONN., RF, BNC, RCPT,THT, STR, 5-PIN AMPHENOL CONNEX, 112404

9 1 J9 CONN.,HDR, MALE, 2×7,2mm, R/A THT MOLEX, 87760-1416

10 1 J10 CONN.,HDR, FEMALE, 2×7, 2mm, R/A THT SULLINS, NPPN072FJFN-RC

11 1 J11 CONN.,HDR, SHROUDED, 2×6, 2mm, THT, VERT FCI, 98414-G06-12ULF

12 3 XJP1, XJP2, XJP3 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

13 4 STANDOFF STANDOFF, NYLON, SNAP-ON, 0.625 (15.9mm) KEYSTONE, 8834

14 1 SW1,SW2 SWITCH, SUB-MINIATURE SLIDE, DPDT, 0.3A, 6VDC, THT C&K COMPONENTS, JS202011CQN

PARTS LIST

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