Analog Devices DC2652A-A Manuel utilisateur

DEMO MANUAL DC2652A-A

Rev. 0

DESCRIPTION

LTC3888

8-Phase, Dual-Output Synchronous Buck

Converter with Power System Management

Demonstration circuit 2652A-A is an 8-phase dual-output,

high efficiency, high density, synchronous buck converter

with 7V to 14V input range. Each output can supply up to

120A maximum load current with 1V output. The demo

board showcases the LT C

3888, which is a PMBus-

compliant dual loop 8-phase step-down DC/DC controller

with digital power system management. The LTC3888 is

designed to work with DrMOS devices that provide an out-

put current sense and temperature monitor. Please refer

to LTC3888’s data sheet for more detailed information.

DC2652A-A powers up to default settings and produces

power based on configuration resistors (or with the set-

ting in its non-volatile memory) without the need for any

serial bus communication. This allows easy evaluation of

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

BOARD PHOTO

the DC/DC converter. To fully explore the extensive power

system management features of the part, download the

GUI 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:

here

For more details and instructions of LTpowerPlay,

please refer to LTpowerPlay Quick Start Procedure.

Design files for this circuit board are available.

Figure1. Dual-Output LTC3888/DC2652A-A Demo Circuit

DEMO MANUAL DC2652A-A

Rev. 0

QUICK START PROCEDURE

DC2652A-A is easy to set up to evaluate the performance

of LTC3888. Refer to Figure2 for the proper measurement

equipment setup and follow the procedure below.

1. With power off, connect the input power supply

(7V-14V) to VIN (J1) and GND (J2).

2. Connect the 1.0V output load (Initial load: no load)

between VOUT0 (J3) and GND (J4).

3. Connect the 1.0V output load (Initial load: no load)

between VOUT1 (J5) and GND (J6).

4. ConnecttheDMMstotheinputandoutputs.Setdefault

jumper position:

• JP1: ON

• JP2: EXT

• JP3: SLAVE

• JP4: SLAVE

• SW1: ON

• SW2: ON

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

proper output voltages. VOUT0 should be 1.0V±0.5%

and VOUT1 should be 1.0V ±0.5%.

6. Oncetheproperoutputvoltagesareestablished,adjustthe

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 LTpowerPlay Quick Start Procedure

for details.

Note:

1. When measuring the efﬁciency, it is recommended

to monitor the VIN, VOUT0 and VOUT1 at the locations

close to the power stage. Here are examples:

(1) Monitor VIN across CIN9 and VOUT0 across COUT11

for VOUT0 efﬁciency measurement

(2) MonitorVIN acrossCIN29 and VOUT1across COUT31

for VOUT1 efﬁciency measurement

2. When measuring the output or input voltage ripple,

do not use the long ground lead on the oscilloscope

probe. 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.

3. Whendoing theloadtransienttest, itisrecommendedto

use a function generator to generate a pulse (~3% duty

cycle with 10Hz~100Hz frequency). Then applying this

pulse to the EXT PULSE (E9) and GND (E10) turrets, the

dynamic load circuit will work well to achieve desired

load transient test by adjusting the amplitude, rising

edge and falling edge of the pulse. Here are examples:

(1) Set the amplitude of the pulse to 3.4V for a 0A to 30A

load transient test with 10mΩ IOUT sensing resistor

(2) Set the amplitude of the pulse to 3.6V for a 0A to 40A

load transient test with 10mΩ IOUT sensing resistor

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Input Voltage Range 7V to 14V

Output Voltage, VOUT0 VIN = 7 to 14V, IOUT0 = 0A to 120A 0.3 to 1.8V, Default: 1.0V

Maximum Output Current, IOUT0 VIN = 7 to 14V, VOUT0 = 0.3V to 1.8V 120A

Output Voltage, VOUT1 VIN = 7 to 14V, IOUT1 = 0A to 120A 0.3 to 1.8V, Default: 1.0V

Maximum Output Current, IOUT1 VIN = 7 to 14V, VOUT1 = 0.3V to 1.8V 120A

Typical Efficiency of VOUT0 VIN = 12V, VOUT0 = 1.0V, IOUT0 = 120A 91.7%

Typical Efficiency of VOUT1 VIN = 12V, VOUT1 = 1.0V, IOUT1 = 120A 91.7%

Default Switching Frequency 500kHz

DEMO MANUAL DC2652A-A

Rev. 0

QUICK START PROCEDURE

Figure2. Proper Measurement Equipment Setup

Figure3. Measuring Output Voltage Ripple

–

VOUT0

IOUT0

IOUT1

VOUT1

+–

IIN

POWER

SUPPLY

+–

–

LOAD0

–

LOAD1

DC2652A-A F02

+ –

OUT

GND

COUT

DEMO MANUAL DC2652A-A

Rev. 0

QUICK START PROCEDURE

Connecting a PC to DC2652A-A

You can use a PC to reconfigure the power management

features of LTC3888 such as:nominal VOUT, margin set

points, OV/UV limits, temperature fault limits, sequenc-

ing parameters, the fault log, fault responses, GPIOs

and other functionalities. The DC1613A dongle may be

plugged when VIN is present.

USB CABLE VIN

VOUT0

LOAD0

LOAD1

OUT1

12-PIN (J12)

CONNECTOR

USB TO I2C/PMBUS

DONGLE DC1613A

INPUT POWER

SUPPLY

LTC3888 DEMO BOARD

DC2652A-A

VOUT0 = 1.8V

VOUT0 = 1V

100

120

EFFICIENCY (%)

LOAD CURRENT (A)

DC2652A-A F05

VOUT1 = 1.8V

VOUT1 = 1V

100

120

EFFICIENCY (%)

LOAD CURRENT (A)

DC2652A-A F06

Figure4. Demo Setup with PC

Figure5. Efficiency vs. Load Current on VOUT0 Figure6. Efficiency vs. Load Current on VOUT1

DEMO MANUAL DC2652A-A

Rev. 0

QUICK START PROCEDURE

VOUT0

(20MHz BW)

[50mV/DIV]

OUT0 0A-30A

LOAD STEP

[20A/DIV]

DC2652A-A F07

100µs/DIV

VOUT1

(20MHz BW)

[50mV/DIV]

OUT1 0A-30A

LOAD STEP

[20A/DIV]

DC2652A-A F08

100µs/DIV

VOUT0

(20MHz BW)

[10mV/DIV]

DC2652A-A F09

1µs/DIV

VOUT1

(20MHz BW)

[10mV/DIV]

DC2652A-A F10

1µs/DIV

Figure7. VOUT0 Load Transient Response at

VIN = 12V, VOUT0 = 1.0V

Figure9. VOUT0 Voltage Ripple at VIN = 12V,

VOUT0 = 1.0V, IOUT0 = 120A

Figure8. VOUT1 Load Transient Response at

VIN = 12V, VOUT1 = 1.0V

Figure10. VOUT1 Voltage Ripple at VIN = 12V,

VOUT1 = 1.0V, IOUT1 = 120A

DEMO MANUAL DC2652A-A

Rev. 0

Figure11. Thermal at VIN = 12V, VOUT0 = 1.0V, IOUT0 = 120A, VOUT1 = 1.0V, IOUT1 = 120A, TA= 23°C, No Airflow

QUICK START PROCEDURE

DEMO MANUAL DC2652A-A

Rev. 0

LTpowerPlay is a powerful Windows based development

environment that supports Analog Devices power sys-

tem management ICs and μModules, including LTM4675,

LTM4676, LTM4677, LTM4678, LTM4680, LTM4700,

LTC3880, LTC3882, LTC3883, LTC3884 and LTC3888.

The software supports a variety of different tasks. You

can use LTpowerPlay to evaluate Analog Devices ICs by

connecting to a demo board system. LTpowerPlay can

also be used in an offline mode (with no hardware pres-

ent) 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

LTPOWERPLAY SOFTWARE GUI

up rails. LTpowerPlay utilizes the DC1613A USB-to-I2C/

SMBus/PMBus controller to communicate with one of

many potential targets, including LTM4675, LTM4676,

LTM4677, LTM4678, LTM4680, LTM4700, LTC3880,

LTC3882, LTC3883, LTC3884 and LTC3888’s demo sys-

tem, or a customer board. The software 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:

here

To access technical support documents for ADI’s

Digital Power System Management Products, visit the

LTpowerPlay Help menu.

Figure12. LTpowerPlay Main Interface

DEMO MANUAL DC2652A-A

Rev. 0

LTPOWERPLAY QUICK START PROCEDURE

The following procedure describes how to use LTpowerPlay

to monitor and change the settings of LTC3888.

1 Download and install the LTpowerPlay GUI:

here

2. Launch the LTpowerPlay GUI.

a. The GUI should automatically identify the DC2652A-A.

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 LTC3888 is

communicating:

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

theRAM fromtheLTC3888.This readstheconﬁguration

from the RAM of LTC3888 and loads it into the GUI.

d. If you want to change the output voltage to a different

value, like 1.8V. In the Config tab, type in 1.8 in the

VOUT_COMMAND box, like this:

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

registervaluestotheLTC3888. After ﬁnishing this step,

you will see the output voltage will change to 1.8V.

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 DC2652A-A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 6 C1, C2, C3, C4, C5, C6 CAP., 270µF, ALUM, 16V, 20%, SMD 8 × 11.9mm,

E12

PANASONIC/16SVPC270M

2 18 COUT1, COUT2, COUT6, COUT7,

COUT10, COUT11, COUT14,

COUT15, COUT18, COUT19,

COUT22, COUT23, COUT26,

COUT27, COUT30, COUT31,

COUT64, COUT65

CAP., 100µF, X5R, 6.3V, 20%, 1210 AVX/12106D107MAT2A

3 32 CIN1, CIN2, CIN3, CIN4, CIN5, CIN6,

CIN7, CIN8, CIN9, CIN10, CIN11,

CIN12, CIN13, CIN14, CIN15, CIN16,

CIN17, CIN18, CIN19, CIN20, CIN21,

CIN22,CIN23, CIN24, CIN25, CIN26,

CIN27, CIN28, CIN29, CIN30, CIN31,

CIN32

CAP., 22µF, X7R, 25V, 10%, 1210 AVX/12103C226KAT2A

4 16 COUT3, COUT4, COUT8, COUT9,

COUT12, COUT13, COUT16,

COUT17, COUT20, COUT21,

COUT24, COUT25, COUT28,

COUT29, COUT32, COUT33

CAP., 470µF, TANT, POSCAP, 2.5V, 20%, 7343,

TPF Series

PANASONIC/ETPF470M5H

5 16 C7, C16, C20, C27, C29, C34, C36,

C41, C43, C48, C50, C55, C57, C62,

C64, C69

CAP., 0.47µF, X5R, 10V, 10%, 0402 AVX/0402ZD474KAT2A

6 1 C8 CAP., 4.7µF, X5R, 16V, 20%, 0603 MURATA/GRM188R61C475MAAJD

7 1 C9 CAP., 1µF, X7R, 16V, 20%, 0603 AVX/0603YC105MAT2A

8 1 C10 CAP., 2.2µF, X5R, 16V, 10%, 0603 KEMET/C0603C225K4PAC7867

9 2 C11, C108 CAP., 2.2µF, X5R, 16V, 10%, 0805 AVX/0805YD225KAT2A

10 16 C12, C14, C23, C25, C30, C32, C37,

C39, C44, C46, C51, C53, C58, C59,

C65, C67

CAP., 4.7µF, JB, 10V, 20%, 0402 TDK/C1005JB1A475M050BC

11 8 C17, C28, C35, C42, C49, C56, C63,

C70

CAP., 330pF, X7R, 50V, 10%, 0402 AVX/04025C331KAT2A

12 2 C18, C19 CAP., 3300pF, X7R, 50V, 10%, 0603 AVX/06035C332KAT2A

13 2 C21, C22 CAP., 330pF, X7R, 50V, 10%, 0603 KEMET/C0603S331K5RAC7867

14 3 CIN33, CIN34, COUT67 CAP., 10µF, X7R, 16V, 10%, 1210 AVX/1210YC106KAT2A

15 1 COUT66 CAP., 4.7µF, X5R, 16V, 20%, 1210 AVX/1210YD475MAT2A

16 2 C110, C113 CAP., 1µF, X7R, 50V, 10%, 0805 MURATA/GRM21BR71H105KA12L

17 1 C111 CAP., 4.7µF, X5R, 16V, 10%, 0603 AVX/0603YD475KAT2A

18 1 C112 CAP., 0.1µF, X7R, 16V, 10%, 0603 AVX/0603YC104KAT2A

19 1 C114 CAP., 5.6pF, C0G/NP0, 50V, ±0.25pF, 0603 AVX/06035A5R6CAT2

20 1 C116 CAP., 100pF, C0G/NP0, 25V, 5%, 0603 AVX/06033A101JAT2

21 1 D1 DIODE, SCHOTTKY, 200V, 1A, PowerDI-123,

AEC-Q101

DIODES INC./DFLS1200-7

22 8 L1, L2, L3, L4, L5, L6, L7, L8 IND., 215nH, PWR, FERRITE, 10%, 61A, 0.29mΩ,

10.4 × 8.0mm SMD

EATON/FP1007R3-R22-R

23 1 L9 IND., 4.7µH, PWR, 20%, 5.9A, 40mΩ,

5.48 × 5.28mm SMD, XAL5030, AEC-Q200

COILCRAFT/XAL5030-472ME

DEMO MANUAL DC2652A-A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

24 1 R3 RES., 1Ω, 5%, 1/10W, 0603, AEC-Q200 VISHAY/CRCW06031R00JNEA

25 3 R9, R10, R18 RES., 1kΩ, 1%, 1/10W, 0603, AEC-Q200 NIC/NRC06F1001TRF

26 7 R15, R17, R48, R49, R51, R54, R244 RES.,10kΩ, 1%, 1/10W, 0603, AEC-Q200 KOA SPEER/RK73H1JTTD1002F

27 1 R16 RES., 4.99kΩ, 1%, 1/10W, 0603, AEC-Q200 NIC/NRC06F4991TRF

28 8 R23, R46, R68, R82, R97, R112,

R126, R139

RES., 10kΩ, 1%, 1/16W, 0402, AEC-Q200 NIC/NRC04F1002TRF

29 1 R41 RES., 18.7kΩ, 1%, 1/10W, 0603, AEC-Q200 NIC/NRC06F1872TRF

30 1 R53 RES., 2kΩ, 1%, 1/10W, 0603, AEC-Q200 KOA SPEER/RK73H1JTTD2001F

31 4 R89, R98, R234, R235 RES., 10Ω, 1%, 1/10W, 0603 NIC/NRC06F10R0TRF

32 1 R250 RES., 2Ω, 1%, 1/10W, 0603, AEC-Q200 VISHAY/CRCW06032R00FKEA

33 1 R251 RES., 100kΩ, 1%, 1/10W, 0603, AEC-Q200 PANASONIC/ERJ3EKF1003V

34 1 R252 RES., 60.4kΩ, 1%, 1/10W, 0603, AEC-Q200 PANASONIC/ERJ3EKF6042V

35 1 R253 RES., 619kΩ, 1%, 1/10W, 0603, AEC-Q200 NIC/NRC06F6193TRF

36 1 R255 RES., 200kΩ, 1%, 1/10W, 0603 NIC/NRC06F2003TRF

37 1 R256 RES., 84.5kΩ, 1%, 1/10W, 0603, AEC-Q200 NIC/NRC06F8452TRF

38 1 U1 IC, 8-Phase,Dual Output Synch. Buck Cvrtr,

QFN-52 (UHG)

LINEAR TECH/LTC3888IUHG#PBF

39 8 U2, U3, U4, U5, U6, U7, U8, U9 IC, Powerstage Gate Driver, DrMOS, PQFN 5mm ×

6mm, 70A

INFINEON/TDA21470AUMA1

40 1 U22 IC, 1A SYNC. STEP-DOWN CONVERTER, DFN-14 LINEAR TECH/LTC3646EDE-1#PBF

Additional Demo Board Circuit Components

1 0 C13, C24, C31, C38, C45, C52, C60,

C66

CAP., OPTION, 0402

2 0 C15, C26, C33, C40, C47, C54, C61,

C68,C115, C119, C121, C122

CAP., OPTION, 0603

3 0 COUT38, COUT45, COUT46,

COUT50, COUT51, COUT52,

COUT53, COUT54, COUT57,

COUT58, COUT59, COUT62

CAP., OPTION, 7343

4 4 COUT39, COUT60, COUT61,

COUT63

CAP., 470µF, TANT, POSCAP, 2.5V, 20%, 7343,

TPF Series

PANASONIC/ETPF470M5H

5 10 COUT40, COUT41, COUT42,

COUT44, COUT47, COUT48,

COUT55, COUT56, C84, C85

CAP., 100µF, X5R, 6.3V, 20%, 1210 AVX/12106D107MAT2A

6 2 COUT43, COUT49 CAP., 1µF, X7R, 16V, 20%, 0603 AVX/0603YC105MAT2A

7 4 C102, C103, C105, C106 CAP., 10µF, X5R, 10V, 10%, 0603 AVX/0603ZD106KAT2A

8 2 C104, C107 CAP., 0.01µF, C0G, 25V, 5%, 0603 AVX/06033A103JAT2

9 1 C86 CAP., 0.1µF, X7R, 50V, 10%, 0603 AVX/06035C104KAT2A

10 2 C87, C89 CAP., 1µF, X7R, 16V, 20%, 0603 AVX/0603YC105MAT2

11 1 C88 CAP., 150pF, C0G, 25V, 10%, 0603 AVX/06033A151KAT2

12 1 C90 CAP., 0.1µF, X7R, 50V, 10%, 0603 AVX/06035C104KAT2A

13 2 C91, C92 CAP., 0.01µF, C0G, 25V, 5%, 0603 AVX/06033A103JAT2A

14 6 C99, C100, C101, C117, C118, C120 CAP., 0.1µF, X7R, 50V, 10%, 0603 AVX/06035C104KAT2A

15 0 D2, D3 DIODE, OPTION, SOD-323

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