Linear Technology Analog Devices DC2728A Quick setup guide

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DEMO MANUAL DC2728A
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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
IN
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

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DEMO MANUAL DC2728A
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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

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DEMO MANUAL DC2728A
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Figure2. Proper Measurement Equipment Setup
Figure3. Proper Measurement Equipment Setup
V
OUT
GND
QUICK START PROCEDURE

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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)
0
1
2
3
4
5
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)
0
1
2
3
4
5
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

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DEMO MANUAL DC2728A
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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

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DEMO MANUAL DC2728A
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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

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DEMO MANUAL DC2728A
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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
register values to the LTC7880. After finishing this step,
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.

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DEMO MANUAL DC2728A
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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

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DEMO MANUAL DC2728A
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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

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DEMO MANUAL DC2728A
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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