Linear Technology DC2312A-A Quick setup guide

dc2312afb

DEMO MANUAL

DC2312A-A/DC2312A-B

DESCRIPTION

LTC3882EUJ-1 High Efficiency

Step-Down DC/DC Converter

with Power System Management

Demonstration circuit 2312A is a high current, high

efficiency, dual phase synchronous buck converter

featuring the LTC3882EUJ-1, a dual output voltage

mode controller with the additional features of dif-

ferential VOUT sense and dedicated PGOOD output on

both channels, compared to LTC3882. The LTC3882-1

has the PMBus interface and power system manage-

ment functions.

There are two versions of the boards available:

n DC2312A-A: Dual phase dual output configuration. De-

faultoutputsettingVOUT0

=1.5V/35A,VOUT1=1.0V/35A.

n DC2312A-B: Dual phase single output configuration.

Default output setting VOUT0 = 1.0V/70A.

The DC2312A powers up to default settings and pro-

duces power based on configuration resistors or with

its nonvolatile memory without the need for any serial

bus communication. This allows easy evaluation of the

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

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 LTC’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 pa-

rameters that include voltage, current, temperature and

fault status.

GUI Software LTpowerPlay Download

The software can be downloaded from:

http://www.linear.com/LTpowerPlay

Design files for this circuit board are available at

http://www.linear.com/demo/DC2312A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 7 12 14 V

VOUT0 Output Voltage Range (-A Version) IOUT0 = 0A to 35A, VIN = 7V to 14V 0.5 1.5 2.0* V

IOUT0 Output Current Range (-A Version) 0 35** A

VOUT1 Output Voltage Range (-A Version) IOUT1 = 0A to 35A, VIN = 7V to 14V 0.5 1.0 2.0* V

IOUT1 Output Current Range (-A Version) 0 35** A

VOUT0 Output Voltage Range (-B Version) IOUT0 = 0A to 70A, VIN = 7V to 14V 0.5 1.0 2.0* V

IOUT0 Output Current Range (-B Version) 0 70** A

FSW Factory Default Switching (-A Version) 500 kHz

FSW Factory Default Switching (-B Version) 450 kHz

EFFICIENCY Full Load Efficiency (-A Version) VOUT0 = 1.5V, IOUT0 = 35A, See Figure 5 90.6 %

VOUT1 = 1.0V, IOUT1 = 35A, See Figure 5 88.0 %

Full Load Efficiency (-B Version) VOUT0 = 1.0V, IOUT0 = 70A, See Figure 6 87.8 %

*Note: The DC2312A uses 2.5V-rated low ESR PosCAP (Part No. 2R5TPE470M7) as output capacitors for optimized load transient performance.

If > 2.0V VOUT is needed, 4V or 6.3V-rated output capacitors should be used.

**Note: When continuously running at full load, forced air flow is needed.

dc2312afb

DEMO MANUAL

DC2312A-A/DC2312A-B

QUICK START PROCEDURE

Figure1. Demo Setup with PC

Demonstration circuit 2312A makes it easy to set up to

evaluate the performance of the LTC3882-1. Refer to

Figures 2 and 3 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 C13 or C39. See

Figure 4 for proper scope probe technique.

1. Make sure jumpers are in the following positions:

DC2312A-A Version

JUMPER POSITION FUNCTION

JP1 NC Untie GPIO0B to GPIO1B

JP2 NC Untie RUN0 to RUN1

JP4 ON External 5V VDR for DrMOS

JP6 ON External 5V VCC for LTC3882-1

DC2312A-B Version

JUMPER POSITION FUNCTION

JP1 CTie GPIO0B to GPIO1B

JP2 CTie RUN0 to RUN1

JP4 ON External 5V VDR for DrMOS

JP6 ON External 5V VCC for LTC3882-1

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

and GND. Connect active load to the output.

3. Make sure both RUN switches are OFF.

4. Turn on the power at the input.

Note. Make sure that the input voltage does not ex-

ceed15V.

5. Turn on RUN switches as desired.

6. Check for the correct output voltage from VOUT0+to

VOUT0–and from VOUT1+to VOUT1–.

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 Procedure

session for details.

CONNECTING A PC TO DC2312A

You can use a PC to reconfigure the power management

features of the LTC3882-1 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.

USB TO I2C/PMBUS

DONGLE DC1613A

LTC3882-1

DEMO BOARD

DC2312A

+12V

POWER SUPPLY

USB CABLE

12-PIN

CONNECTOR

LOAD

VOUT0

VIN

DC2312A F01

VOUT1

dc2312afb

DEMO MANUAL

DC2312A-A/DC2312A-B

Figure2. Power Test Setup for DC2312A-A

QUICK START PROCEDURE

POWER

SUPPLY

VOUT0

LOAD

SHUNT

IOUT0

VOUT1

LOAD

SHUNT

IOUT1

IIN

VIN

VOUT1

VOUT0

DC1613A

CONNECTOR

–

+–

DC2312A F02

dc2312afb

DEMO MANUAL

DC2312A-A/DC2312A-B

Figure3. Power Test Setup for DC2312A-B

QUICK START PROCEDURE

POWER

SUPPLY

VOUT0

LOAD 1

SHUNT

IOUT0_1

VOUT0

LOAD 2

SHUNT

IOUT0_2

IIN

VIN

VOUT0

DC1613A

CONNECTOR

–

+–

DC2312A F03

FOR BETTER THERMAL DISTRIBUTION,

USE A PIECE OF LOW IMPEDANCE METAL

TO CONNECT TOP LAYER VOUT COPPER

AND PULL CURRENT EVENLY FROM J3

TO J4 AND FROM J9 TO J8.

dc2312afb

DEMO MANUAL

DC2312A-A/DC2312A-B

COMBINING DC2312A WITH OTHER DIGITAL POWER

DEMO BOARDS

The DC2312A may be plugged together in a multi-board

array with other LT C power system management boards

using J12 and J13.

MEASURING OUTPUT RIPPLE VOLTAGE

An accurate ripple measurement may be performed by

using the configuration in Figure 4 across C13 or C39.

QUICK START PROCEDURE

MEASURING EFFICIENCY (SEE FIGURES 5 AND 6)

To accurately measure efficiency of any configuration, do

the following:

n Set JP4 and JP6 on the “OFF” position.

n Connect external 5V supply to VDR and VCC turrets and

measure its input current.

n Measure VIN across the input ceramic capacitor (C10,

C6). Measure VOUT across the output ceramic capaci-

tor (C13, C39).

n Add the loss from external 5V supply into the efficiency

calculation.

LOAD CURRENT (A)

EFFICIENCY (%)

DC2312A F05

VOUT0 = 1.5V

VOUT1 = 1.0V

LOAD CURRENT (A)

EFFICIENCY (%)

DC2312A F06

VOUT0 = 1.0V

Figure4. Measuring Output Voltage Ripple

Figure5. DC2312A-A, Typical Efficiency Curves,

VIN = 12V, FSW = 500kHz, CCM

Figure6. DC2312A-B, Typical Efficiency Curves,

VIN = 12V, FSW = 450kHz, CCM

+ –

VOUT GND

COUT

dc2312afb

DEMO MANUAL

DC2312A-A/DC2312A-B

Figure7. Load Transient Waveform DC2312A-A, VIN = 12V, VOUT0 = 1.5V, FSW = 500kHz, 0% to 25% (8.75A) Load Step

Figure8. Load Transient Waveform DC2312A-A, VIN = 12V, VOUT1 = 1.0V, FSW = 500kHz, 0% to 25% (8.75A) Load Step

Figure9. Load Transient Waveform DC2312A-B, VIN = 12V, VOUT0 = 1.0V, FSW = 450kHz, 0% to 25% (17.5A) Load Step

QUICK START PROCEDURE

dc2312afb

DEMO MANUAL

DC2312A-A/DC2312A-B

Figure 10. Thermal Picture of DC2312A-A, VIN = 12V, VOUT0 = 1.5V/35A, VOUT1 = 1.0V/35A, fSW = 500kHz, 400LFM Air Flow

Figure 11. Thermal Picture of DC2312A-B, VIN = 12V, VOUT0 = 1.0V/70A, fSW = 450kHz, 400LFM Air Flow

QUICK START PROCEDURE

dc2312afb

DEMO MANUAL

DC2312A-A/DC2312A-B

LTpowerPlay is a powerful Windows-based develop-

ment environment that supports Linear Technology

power system management ICs, including the LTC3880,

LTC3882/LTC3882-1, LTC3883, LTM4676A, LTC2974

and the 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 multi-chip

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

LTpowerPlay SOFTWARE GUI

issues when bringing up rails. LTpowerPlay utilizes the

DC1613A USB-to-SMBus controller to communicate with

one of many potential targets, including the LTC3882-1’s

DC2312A 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://www.linear.com/LTpowerPlay

To access technical support documents for LT C Digital

Power Products visit Help. View online help on the

LTpowerPlay menu.

Figure12. LTpowerPlay Main Interface

dc2312afb

DEMO MANUAL

DC2312A-A/DC2312A-B

ThefollowingproceduredescribeshowtouseLTpowerPlay

to monitor and change the settings of LTC3882-1 (taking

DC2312A-A as an example).

1. Download and install the LTPowerPlay GUI:

http://www.linear.com/LTpowerPlay

2. Launch the LTpowerPlay GUI.

a. TheGUIshouldautomaticallyidentifytheDC2312A-A.

The system tree on the left hand side should look

like this:

LTpowerPlay QUICK START PROCEDURE

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

lowerleft handcorner, conﬁrming thatthe LTC3882-1

is communicating:

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

read the RAM from the LTC3882-1. This reads the

conﬁguration from the RAM of LTC3882-1 and loads

it into the GUI:

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

value, like 1.2V. In the Config tab, type in 1.2 in the

VOUT_COMMAND box, like this:

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

step, you will see the output voltage will change to 1.2V.

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 with a new name.

dc2312afb

DEMO MANUAL

DC2312A-A/DC2312A-B

PARTS LIST DC2312A-A

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 3 C5, C52, C53 CAP., X7R, 0.1µF, 16V, 10%, 0402 AVX, 0402YC104KAT2A

2 3 CF, COUT4, COUT5 CAP., X7R, 0.1uF, 16V, 10%, 0603 AVX, 0603YC104KAT2A

3 2 CFFW1, CFFW2 CAP., NP0, 22pF, 25V, 10%, 0402 AVX, 04023A220KAT2A

4 1 CIN1 CAP., X5R, 10µF, 25V, 20%, 1206 AVX, 12063D106MAT2A

5 2 COUT3, COUT7 CAP., X5R, 10µF, 16V, 10%, 0805 AVX, 0805YD106KAT2A

6 1 CIN3 CAP., TANT, 22µF, 35V, 20%, 7343 AVX, TCME226M035R0025

7 4 C6, C10, C33, C34 CAP., X5R, 22µF, 25V, 10%, 1210 MURATA, GRM32ER61E226KE15L

8 6 C1, C2, C8, C31, C35, C9 CAP., X5R, 1µF, 10V, 20%, 0402 MURATA, GRM155R61A105ME15D

9 1 C7 CAP., X5R, 2.2µF, 10V, 20%, 0402 Taiyo Yuden, LMK105BJ225MV-F

10 3 C47, C57, C58 CAP., X5R, 1µF, 16V, 10%, 0805 AVX, 0805YD105KAT2A

11 2 C3, C4 CAP., OS-CON, 330µF, 16V, 20%, F12 PANASONIC, 16SVP330M

12 2 C11, C36, CAP., X7R, 100nF, 16V, 10%, 0402 MURATA, GRM155R71C104KA88D

13 1 C45 CAP., X7R, 100nF, 16V, 10%, 0603 TDK, C1608X7R1C404KT000N

14 8 C12, C13, C14, C23, C38, C39, C40, C43 CAP., X5R, 100µF, 6.3V, 20%, 1206 MURATA, GRM31CR60J107ME39L

15 8 C15, C16, C26, C27, C17, C18, C19, C28 CAP., POSCAP, 470µF, 2.5V, D2E SIZE PANASONIC, EEFGX0E471R

16 2 L1, L2 IND., 0.17µH COOPER., FP1007R3-R17-R

17 1 R1 RES., CHIP, 1, 1%, 0402 VISHAY, CRCW04021R00FKED

18 2 R2, R15 RES., CHIP, 24.9k, 1%, 0402 VISHAY, CRCW040224K9FKED

19 2 R93, R94 RES., CHIP, 200, 1%, 0603 VISHAY, CRCW0603200RFKED

20 3 R80, R81, R84 RES., CHIP, 127, 1%, 0603 VISHAY, CRCW0603127RFKEA

21 1 R87 RES., CHIP, 15.8k, 1%, 0603 VISHAY, CRCW060315K8FKEA

22 2 U1, U3 IC, HIGH FREQUENCY DrMOS MOUDLE FAIRCHILD, FDMF5820DC

23 1 U2 IC, LTC3882EUJ-1, QFN 6mm × 6mm LINEAR TECH., LTC3882EUJ-1#0134-1PBF

24 1 U5 IC EEPROM 2KBIT 400kHz 8 TSSOP MICROCHIP, 24LC025-I/ST

25 1 U6 IC., LTC3607EMSE, 16 Pin QFM 3mm × 3mm LINEAR TECH., LTC3607IMSE#PBF

26 1 R20 RES., CHIP, 53.6k, 1%, 0402 VISHAY, CRCW040253K6FKED

27 1 C50 CAP., NP0, 10pF, 25V, 10%, 0402 AVX, 04023A100KAT2A

28 1 C54 CAP., X7R, 220pF, 50V, 10%, 0402 MURATA, GRM155R71H221KA01D

29 2 C21, C55 CAP., X7R,680pF, 50V, 10%, 0402 MURATA, GRM155R71H681KA01D

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