Linear Technology DC1936A Quick setup guide

dc1936afa

DEMO MANUAL DC1936A

DESCRIPTION

LTC3882EUJ

Dual Output Step-Down DC/DC Controller

with Power System Management

Demonstration circuit 1936A is a high current, high ef-

ficiency, polyphase synchronous buck converter featuring

the LTC3882EUJ, a dual output polyphase voltage mode

controller. The LTC3882 has the PMBus interface and

power system management functions.

The DC1936A uses 6mm × 6mm DrMOS as the power

stage. The input range of this board is from 7V to 14V,

and the output voltage can be programmed from 0.8V to

1.8V.TheDC1936Aprovides two outputs, with each output

capable of 1V/30A. The DC1936A has optional discrete

driver (LTC4449EDCB) and MOSFET footprints for high

input voltage applications up to 38V. The DC1936A also

has an on-board dynamic load circuit, which makes it easy

for the customer to evaluate the transient performances.

The DC1936A powers up to default settings and pro-

duces power based on configuration resistors or with its

non-volatile memory without the need for any serial bus

communication. This allows easy evaluation of the DC/

DC converter. To fully explore the extensive power system L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

LTPowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

PERFORMANCE SUMMARY

management features of the parts, download the GUI

software LTpowerPlay™ onto your PC and use LT C ’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 settings within its onboard

EEPROM, along with viewing telemetry parameters that

include voltage, current, temperature and fault status.

GUI Download

The software can be downloaded from:

http://www.linear.com/ltpowerplay

For more details and instructions of LTpowerPlay, please

refer to LTpowerPlay for LTC3880 Quick Start Guide. The

LTC3882 operation in LTpowerPlay is similar to that of

the LTC3880.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1936A

Specifications are at TA= 25°C

*Note: The DC1936A uses 4V-rated low ESR PosCAP (Part No. 4TPF470ML) as output capacitors for optimized load transient performance. If >3.6V VOUT

is needed, 6.3V-rated output capacitors should be used.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 7 12 14 V

VOUT0,1 Output Voltage Range IOUT = 0A TO 30A, VIN = 7V to 14V 0.8 1 1.8* V

IOUT0,1 Output Current Range 0 30 A

fSW Factory Default Switching 500 kHz

EFF Peak Efficiency VIN = 12V, VOUT0 = 1V, See Figure 4 90.4 %

LOAD TRANSIENT Output Voltage Peak-to-Peak Spike During

Load Transient

VIN = 12V, VOUT0 = 1V, ISTEP = 0A – 7.5A 30 mV

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dc1936afa

DEMO MANUAL DC1936A

QUICK START PROCEDURE

Demonstration circuit 1936A makes it easy to set up

to evaluate the performances of the LTC3882. Refer to

Figure 2 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 output voltage ripple by

touching the probe tip directly across the C10/C45. See

Figure 3 for proper scope probe technique.

1. Make sure jumpers are in the following positions:

JUMPER POSITION FUNCTION

JP1 C GPIO0B to GPIO1B

JP2 NC RUN0 to RUN1

JP3 ON 5V Bias for DrMOS

JP4 ON Bias Supply for VCC of the LTC3882

JP5 OFF Write Protection

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

and GND. Connect active load to the output.

3. Make sure RUN switch (SW3 and SW4) is OFF.

4. Turn on the power at the input.

NOTE. Make sure that the input voltage does not

exceed 16V.

5. Turn on RUN switch as desired.

6. Check for the correct output voltage from E6 to E7 for

CH0 and from E8 to E9 for CH1. VOUT = 1V± 0.5%

(0.995V ~ 1.005V)

NOTE: If there is no output, temporarily disconnect the

load to make sure that the load is not set too high.

7. Once the proper output voltage is established, adjust

the loads within the operating range and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters.

8. Connect the dongle and control the output voltages

from the GUI. See LTpowerPlay QUICK START session

for details.

Connecting a PC to DC1936A

You can use a PC to reconfigure the power management

features of the LTC3882 such as: nominal VOUT, margin

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

ing parameters, the fault log, fault responses, GPIO and

other functionality. The DC1613A dongle may be plugged

in regardless of whether or not VIN is present. Dongle can

be hot-plugged.

Figure 1. Demo Setup with PC

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DEMO MANUAL DC1936A

QUICK START PROCEDURE

Figure 2. Power Test Setup for DC1936A

Measuring Efficiency for DC1936A (See Figure 2)

To accurately measure efficiency of any configuration, do

the following:

nSet JP3 and JP4 to OFF position to disable the auxiliary

circuits.

nTurn on one channel only.

nApply external 5V from E21 to E22 as the driver supply

for DrMOS.

nApply external 5V from E5 to E29 as VCC for LTC3882.

nMeasure VIN across the input ceramic capacitor (C6 for

CH1, C39 for CH0). Measure VOUT across the output

ceramic capacitor (C45 for CH1, C10 for CH0).

nThe efficiency is calculated as:

Efficiency =

OUT

•I

OUT

•I

•100%

Measuring Output Ripple Voltage

An accurate ripple measurement may be performed by

using the configuration across C10 as shown in Figure 3.

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dc1936afa

DEMO MANUAL DC1936A

QUICK START PROCEDURE

Figure 4. Typical Efficiency Curves of DC1936A, VIN = 12V, fSW = 500kHz, Single Phase

Figure 3. Measuring Output Voltage Ripple

+ –

VOUT GND

COUT

LOAD CURRENT (A)

EFFICIENCY (%)

80 2010 30

dc1936a F04

155 25

12VIN, 1VOUT, 500kHz

12VIN, 1.2VOUT, 500kHz

12VIN, 0.9VOUT, 500kHz

12VIN, 0.8VOUT, 500kHz

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dc1936afa

DEMO MANUAL DC1936A

QUICK START PROCEDURE

Figure 5. Load Transient Waveform of DC1936A, VIN = 12V, VOUT0 = 1V, fSW = 500kHz, 0% to 25% Load Step

Figure 6. Thermal Picture of DC1936A, VIN = 12V, VOUT0 = VOUT1 = 1V, IOUT0 = IOUT1 = 30A, fSW = 500kHz, No Airflow, TA= 25°C

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DEMO MANUAL DC1936A

LTpowerPlay SOFTWARE GUI

LTpowerPlay is a powerful Windows based development

environment that supports Linear Technology power sys-

tem management ICs, including the LTC3880, LTC3883,

LTC3882, LTC2974 and LTC2978. The software supports

a variety of different tasks. You can use LTpowerPlay to

evaluate Linear Technology ICs by connecting to a demo

board system. LTpowerPlay can also be used in an offline

mode (with no hardware present) in order to build a mul-

tichip configuration file that can be saved and reloaded at a

latertime.LTpowerPlayprovidesunprecedenteddiagnostic

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 the LTC3882’s

DC1936A 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: http://linear.com/ltpowerplay

To access technical support documents for LT C Digital

Power Products visit Help. View online help on the

LTpowerPlay menu.

Figure 7. LTpowerPlay Main Interface

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dc1936afa

DEMO MANUAL DC1936A

LTpowerPlay QUICK START PROCEDURE

ThefollowingproceduredescribeshowtouseLTpowerPlay

to monitor and change the settings of LTC3882.

1. Download and install the LTPowerPlay GUI:

http://linear.com/ltpowerplay

2. Launch the LTpowerPlay GUI.

a. The GUI should automatically identify the DC1936A.

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 the LTC3882

is communicating:

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

RAM from the LTC3882. This reads the conﬁguration

from the RAM of LTC3882 and loads it into the GUI.

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

value, like 1.5V. In the Config tab, type in 1.5 in the

VOUT_COMMAND box, like this:

Then, click the W (PC to RAM) icon to write these reg-

ister values to the LTC3882. After ﬁnishing this step,

you will see the output voltage will change to 1.5V.

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dc1936afa

DEMO MANUAL DC1936A

LTpowerPlay QUICK START PROCEDURE

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.

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 4 C6, C7, C39, C40 CAP., X5R 22µF 25V 10% 1210 AVX, 12103D226KAT2A

2 5 C1, C3, C17, C33, C37 CAP., X7R 1µF 16V 10% 0603 AVX, 0603YC105KAT2A

3 2 C25, C32 CAP., X7R 3.3nF 25V 10% 0603 AVX, 06033C332KAT2A

4 2 C26, C31 CAP., X7R 330pF 16V 0603 AVX, 0603YC331KAT2A

5 1 C59 CAP., X7R 1µF 16V 10% 1206 AVX, 1206YC105KAT2A

6 3 C2, C16, C34 CAP., X5R 2.2µF 16V 10% 0603 TDK, C1608X5R1C225K

7 2 C27, C30 CAP., NPO 33pF 50V 5% 0603 AVX, 06035A330JAT2A

8 2 C4, C5 CAP., OS-CON, 330µF, 16V, 20%, F12 PANASONIC, 16SVP330M

9 3 C8, C54, C67 CAP., X7R 0.1µF 50V 10% 0603 AVX, 06035C104KAT2A

10 8 C9-C12, C45-C48 CAP., X5R 100µF 6.3V 1210 AVX, 12106D107MAT2A

11 6 C14, C15, C23, C41, C49, C50 CAP., POSCAP, 470µF, 4V, D3L SIZE PANASONIC, 4TPF470ML

12 1 C18 CAP., X5R 4.7µF 25V 0805 TAIYO YUDEN, TMK212ABJ475KG-T

13 2 C24, C66 CAP., X7R 0.22µF 25V 10% 0603 TDK, C1608X7R1E224K

14 2 C61, C62 CAP., X7R 2.2µF 6.3V 10% 0805 MURATA, GRM21BR70J225KA01L

15 6 C28, C29, C38, C51, C64, C65 CAP., X7R 0.01µF 50V 10% 0603 AVX, 06035C103KAT2A

16 2 L1, L2 INDUCTOR, SMT POWER IND. 0.22µH PULSE, PA0515.221N LT

17 2 Q1, Q2 TRANS GP SS PNP 40V SOT-23 ON SEMI., MMBT3906LT1G

18 13 R1, R21, R26-R28, R43, R44, R48,

R49, R64, R68, R105, R45

RES., CHIP 0Ω, 0603 VISHAY, CRCW06030000Z0EA

19 4 R3, R51, R69, R104 RES., CHIP, 10Ω, 5%, 0603 VISHAY, CRCW060310R0JKEA

20 1 R31 RES., CHIP, 17.4k, 1%, 0603 VISHAY, CRCW060317K4FKEA

21 1 R32 RES., CHIP, 16.2k, 1%, 0603 VISHAY, CRCW060316K2FKEA

22 2 R29, R36 RES., CHIP, 357Ω, 1%, 0603 VISHAY, CRCW0603357RFKEA

23 2 R5, R54 RES., CHIP, 1Ω, 1%, 0603 NIC, NRC06F1R00TRF

24 2 R30, R33, R6, R13-R18, R56, R61,

R72, R73, R86, R87, R88, R89

RES., CHIP, 10k, 5%, 0603 VISHAY, CRCW060310K0JKEA

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DEMO MANUAL DC1936A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

25 2 U1, U3 IC, HIGH FREQUENCY DrMOS MOUDLE FAIRCHILD, FDMF6820A

26 1 U2 IC, LTC3882EUJ, QFN 6mm x 6mm LINEAR TECH., LTC3882EUJ#10BJ-2PBF-ES

27 1 U4 IC, 24LC025-I/ST, SOIC MICROCHIP, 24LC025-I/ST

Additional Demo Board Circuit Components

1 0 CIN1, CIN2, CIN3, CIN4 OPT CAP., X5R 22µF 25V 10% 1210 AVX, 12103D226KAT2A

2 2 C35, C36 OPT CAP., X7R 47pF 5% 50V 0603 OPT

3 2 C60, C63 CAP., X5R 10µF 35V 1206 TAIYO YUDEN, GMK316BJ106ML-T

4 0 C55, C56, C57, C58, C19, C20, C21,

C42, C43, C44 OPT

CAP., 0603

5 0 D1, D2 OPT DIODE, SCHOTTKY, SOD-323

6 1 D6 DIODE, SCHOTTKY, SOD-323 CENTRAL SEMI., CMDSH-3TR

7 2 D3, D4 LED, 0603 GREEN WURTH ELEKTRONIK, 150060GS75000

8 1 D5 LED, 0603 RED WURTH ELEKTRONIK, 150060SS75000

9 0 D7, D8 DIODE, SOD-323

10 2 Q11, Q12 MOSFET SPEED SRS 30V 30A LFPAK RENESAS, RJK0305DPB-00#J0

11 0 Q3, Q4, Q5, Q6 OPT MOSFET SPEED SRS 30V 30A LFPAK RENESAS, RJK0305DPB-00#J0

12 0 Q7, Q8, Q9, Q10 OPT MOSFET JET SERIES 30V 45A LFPAK RENESAS, RJK0330DPB-00#J0

13 2 Q13, Q14 MOSFET P-CH 20V 0.58A SOT-23 VISHAY, TP0101K-T1-E3

14 2 Q15, Q16 MOSFET N-CH 60V 115MA SOT-23 FAIRCHILD, 2N7002

15 2 SW1, SW2 CONNECTOR, SUB MINIATURE SLIDE SWITCHES C&K., JS202011CQN

16 0 R34, R35, R37-R42, R82-R85, R101,

R102, R46, R47, R58, R59, R60, R66,

R71, R98, R65, R70, R76, R77, R67,

R103, R107 OPT

RES., CHIP, 0603

17 2 R8, R55 RES., CHIP, 1.21k, 1%, 0603 VISHAY, CRCW06031K21FKEA

18 2 R12, R63 RES., CHIP, 30Ω, 1%, 2512 VISHAY, CRCW251230R0FKEG

19 1 R62 RES., CHIP, 15.8k, 1%, 0603 VISHAY, CRCW060315K8FKEA

20 4 R79, R80, R19, R20 RES., CHIP, 4.99k, 1%, 0603 NIC, NRC06F4991TRF

21 2 R90, R91 RES., CHIP, 6.19k, 1%, 0603 VISHAY, CRCW06036K19FKEA

22 2 R92, R93 RES., CHIP, 0.01Ω, 1%, 2010 VISHAY WSL2010R0100FEA

23 4 R94, R95, R4, R52 RES., CHIP, 2k, 1%, 0603 VISHAY, CRCW06032K00FKEA

24 2 R96, R97 RES., CHIP, 200Ω, 1%, 0603 VISHAY, CRCW0603200RFKEA

25 2 R57, R99 RES., CHIP, 50Ω, 1%, 0603 VISHAY, CRCW060350R0FKEA

26 1 R100 RES., CHIP, 127Ω, 1%, 0603 VISHAY, CRCW0603127RFKEA

27 0 U5, U6 OPT N-CHANNEL MOSFET DRIVER, LTC4449IDCB

28 1 U7 IC, LT3029IMSE, MSOP, 16 PIN LINEAR TECH., LT3029IMSE#PBF

dc1936afa

DEMO MANUAL DC1936A

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Hardware: For Demo Board Only

1 29 E1-E29 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 2 J1, J2 JACK, BANANA KEYSTONE, 575-4

3 4 J3-J6 STUD, TEST PIN PEM KFH-032-10

4 8 J3-J6 (X2) NUT, BRASS 10-32 ANY #10-32

5 4 J3-J6 RING, LUG #10 KEYSTONE, 8205, #10

6 4 J3-J6 WASHER, TIN PLATED BRASS ANY #10

7 1 J14 CONN RECEPT 2MM DUAL R/A 14POS (F) SULLINS, NPPN072FJFN-RC

8 1 J15 HEADER 14POS 2MM R/A GOLD (M) MOLEX, 87760-1416

9 1 J10 CONN HEADER 12POS 2MM STR DL PCB FCI 98414-G06-12ULF

10 5 JP1-JP5 0.079 SINGLE ROW HEADER, 3 PIN SULLIN, NRPN031PAEN-RC

11 5 JP1-JP5 SHUNT SAMTEC, 2SN-BK-G

12 2 J11, J12 CONN, BNC, 5 PINS CONNEX, 112404

13 2 SW1, SW2 CONNECTOR, SUB MINIATURE SLIDE SWITCHES C&K., JS202011CQN

PARTS LIST

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