Linear Technology DC1811A Quick setup guide

dc1811afb

DEMO MANUAL DC1811A

DESCRIPTION

LTM4676

Dual Step-Down µModule

Regulator with PMBus Digital

Power System Management

Demonstration circuit 1811A is a dual-output, high ef-

ficiency, high density, µModule

regulator with 4.5V to

26.5V input range. Each output can supply 13A maximum

load current. The demo board has a LT M

4676 µModule

regulator, which is a dual 13A or single 26A step-down

regulator with PMBus power system management. Please

see LTM4676 data sheet for more detailed information

The DC1811A powers up to default settings and produces

power based on configuration resistors without the need

for any serial bus communication. This allows easy evalu-

ation of 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

LT C ’s I2C/SMBus/PMBus dongle DC1613A to connect to

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.

BOARD PHOTO

Figure 1. Dual-Output LTM4676/DC1811A Demo Circuit

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:

http://www.linear.com/ltpowerplay

For more details and instructions of LTpowerPlay, please

refer to LTpowerPlay GUI for LTM4676 Quick Start Guide.

Design files for this circuit board are available at

http://www.linear.com/demo

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DEMO MANUAL DC1811A

QUICK START PROCEDURE

PERFORMANCE SUMMARY

(TA= 25°C)

PARAMETER CONDITION VALUE

Input Voltage Range 4.5V to 26.5V

Output Voltage, VOUT0 VIN = 4.5V to 26.5V, IOUT0 = 0A to 13A 0.5V to 4V, Default: 1V

Maximum Output Current, IOUT0 VIN = 4.5V to 26.5V, VOUT = 0.5V to 4V 13A

Output Voltage, VOUT1 VIN = 4.5V to 26.5V, IOUT1 = 0A to 13A 0.5V to 5.4V, Default: 1.8V

Maximum Output Current, IOUT1 VIN = 4.5V to 26.5V, VOUT = 0.5V to 5.4V 13A

Typical Efficiency VIN = 12V, VOUT = 1.8V, IOUT = 13A 86.3%

Default Switching Frequency 500kHz

Demonstration circuit 1811A is easy to set up to evaluate

the performance of the LTM4676. 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

(4.5V to 26.5V) and GND (input return).

2. Connect the 1.0V output load between VOUT0 and GND

(Initial load: no load).

3. Connect the 1.8V output load between VOUT1 and GND

(Initial load: no load).

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

jumper position: JP1: ON; JP2: ON.

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

output voltages. VOUT0 should be 1.0V±1 %, and VOUT1

should be 1.8 ±1%.

6. Once the proper output voltages are established, ad-

just 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 “LTpowerPlay GUI for the LTM4676

Quick Start Guide” for details.

Note: When measuring the output or input voltage rip-

ple, do not use the long ground lead on the oscilloscope

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.

Connecting a PC to DC1811A

You can use a PC to reconfigure the power management

features of the LTM4676 such as: nominal VOUT, margin

setpoints,OV/UVlimits,temperaturefaultlimits,sequenc-

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

other functionality. The DC1613A dongle may be plugged

when VIN is present.

Table 1. LTM4676 Demo Cards for Up to 130A Point-of-Load Regulation

MAXIMUM OUTPUT CURRENT NUMBER OF OUTPUT VOLTAGES

NUMBER OF LTM4676 µMODULE

REGULATORS ON THE BOARD DEMO BOARD NUMBER

13A, 13A 2 1 DC1811A

26A 1 1 DC2087A

50A 1 2 DC1989A-A

75A 1 3 DC1989A-B

100A 1 4 DC1989A-C

100A 1 1 (+ 3x LTM4620A) DC2106A-A

130A 1 1 (+ 3x LTM4630) DC2106A-B

dc1811afb

DEMO MANUAL DC1811A

QUICK START PROCEDURE

Figure 2. Proper Measurement Equipment Setup

+ –

VOUT GND

COUT

Figure 3. Measuring Output Voltage Ripple

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DEMO MANUAL DC1811A

QUICK START PROCEDURE

Figure 4. Demo Setup with PC

LOAD CURRENT (A)

EFFICIENCY (%)

6 7 8 109 11 12

100

DC1811A F05

12345 13

VOUT = 1V

VOUT = 1.2V

VOUT = 1.5V

VOUT = 1.8V

VOUT = 2.5V

VOUT = 3.3V

VIN = 5V, fSW = 500kHz, CCM

Figure 5. Efficiency vs Load Current at VIN = 5V Figure 6. Efficiency vs Load Current at VIN = 12V

LOAD CURRENT (A)

EFFICIENCY (%)

6 7 8 109 11 12

DC1811A F06

12345 13

VOUT = 1V

VOUT = 1.2V

VOUT = 1.5V

VOUT = 1.8V

VOUT = 2.5V

VOUT = 3.3V

VOUT = 5V

VIN = 12V

fSW = 500kHz

CCM

dc1811afb

DEMO MANUAL DC1811A

QUICK START PROCEDURE

VOUT0

(20MHz BW)

50mV/DIV

9.75A TO 13A

LOAD STEP

Figure 7. Output Voltage VOUT0 vs Load Current

(VOUT0 RANGE = 0)

Figure 8. Output Voltage VOUT1 vs Load Current

(VOUT1 Range = 1)

VOUT1

(20MHz BW)

50mV/DIV

9.75A TO 13A

LOAD STEP

VOUT0

(20MHz BW)

10mV/DIV

Figure 9. Output Voltage Ripple at VIN = 12V,

VOUT0 = 1V, IOUT0 = 13A

Figure 10. Output Voltage Ripple at VIN = 12V,

VOUT1 = 1.8V, IOUT1 = 13A

VOUT1

(20MHz BW)

10mV/DIV

Figure 11. Thermal performance at VIN = 12V, VOUT0 = 1.0V, IOUT0 = 13A, VOUT1 = 1.8V, IOUT1 = 13A, TA = 24°C, 200LFM Airflow

dc1811afb

DEMO MANUAL DC1811A

LTpowerPlay SOFTWARE GUI

LTpowerPlay is a powerful Windows-based development

environment that supports Linear Technology power sys-

tem management ICs, including the LTM4676, LTC3880,

LTC3883, 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.LTpowerPlayprovidesunprecedented 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 the LTM4676, the

LTC3880 and the LTC3883’s demo system, or a customer

board. The software also provides an automatic update

feature to keep the soft-ware 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

dc1811afb

DEMO MANUAL DC1811A

LTpowerPlay QUICK START GUIDE

Thefollowing procedure describeshow to use LTpowerPlay

to monitor and change the settings of LTM4676.

1. Download and install the LTPowerPlay GUI:

http://www.linear.com/ltpowerplay

2. Launch the LTpowerPlay GUI.

a. The GUI should automatically identify the DC1811A.

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 LTM4676

is communicating:

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

read the RAM from the LTM4676. This reads the

configuration from the RAM of LTM4676 and loads

it into the GUI.

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

ent 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

step, you will see the output voltage will change to

1.5V.

dc1811afb

DEMO MANUAL DC1811A

LTpowerPlay QUICK START GUIDE

Ifthe writeissuccessful, youwill see thefollowing 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.

dc1811afb

DEMO MANUAL DC1811A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP., 150µF, 35V, ALUMINUM ELECTR. SUN ELECT., 35CE150AX

2 4 CIN2, CIN3, CIN4, CIN5 CAP., X5R, 10µF, 35V, 10%,1210 MURATA, GRM32ER6YA106KA12

3 6 COUT1-COUT3, COUT6-COUT8 CAP., X5R, 100µF, 6.3V, 20% 1210 AVX, 12106D107MAT2A

4 2 COUT4, COUT5 CAP., 330µF, 6.3V, POSCAP, D3L SANYO, 6TPF330M9L

5 2 C1, C14 CAP., X7R, 2200pF, 25V, 10%, 0603 AVX, 06033C222KAT2A

6 1 C20 CAP., X5R, 100nF, 16V, 10%,0603 AVX, 0603YD104KAT

7 1 C23 CAP., X7R, 1µF, 25V,10%, 0805 AVX, 08053C105KAT2A

8 3 C21, C22, C24 CAP., X5R, 1µF, 25V,10%, 0603 AVX, 06033D105KAT2A

9 2 JP1, JP2 HEADER 3-PIN 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S

10 3 J2-J4 CONN, BNC, 5 PINS CONNEX, 112404

11 1 J1 CONN HEADER 12 POS 2MM STR DL PCB FCI 98414-G06-12ULF

12 6 J5-J10 BANANA SMALL KEYSTONE, 575-4

13 1 Q1 N-CHANNEL 30-V MOSFET VISHAY, SUD50N03-09P

14 7 R3, R5, R7, R9, R25, R31, R32 RES., CHIP, 0Ω, 1%, 0603 NIC, NRC06Z0000TRF

15 13 R10-R16, R18, R19, R24, R46, R47, R52 RES., CHIP, 10k, 1%, 0603 NIC, NRC06F1002TRF

16 1 R30 RES., CHIP, 6.34k, 1%, 0603 VISHAY, CRCW06036K34FKEA

17 3 R2, R44, R45 RES., CHIP, 4.99k, 1%, 0603 NIC, NRC06F4991TRF

18 1 R22 RES., CHIP, 4.22k, 1%, 0603 VISHAY, CRCW06034K22FKEA

19 1 R48 RES., CHIP, 0Ω, 0.5W, 2010 NIC, NRC50ZOTRF

20 1 R53 RES., CHIP, 0.01Ω, 1/2W, 1%, 2010 VISHAY, WSL2010R0100FEA

21 1 U1 IC, LTM4676EY#PBF LINEAR TECH. LTM4676EY#PBF

22 1 U2 IC, 24LC025T-E/OT SOT-23 6-LEAD MICROCHIP, 24LC025T-E/OT

Additional Demo Board Circuit Components

1 0 C2, C15-C17 (OPT) CAP., 0603

2 0 R8, R26-R29, R33-R39, R41 (OPT) RES., 0603

3 0 R4, R6, R20, R23, R49 (OPT) RES., CHIP OPTIONAL

4 0 R50, R51 (OPT) RES., CHIP, 30, 1%, 2010

Hardware-For Demo Board Only

1 24 E1-E24 TESTPOINT, TURRET, 0.062" MILL-MAX, 2308-2-00-80-00-00-07-0

2 2 XJP1, XJP2 SHUNT SAMTEC, 2SN-BK-G

3 4 (STAND-OFF) STAND-OFF, NYLON 0.50" tall KEYSTONE, 8833(SNAP ON)

4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1811A

dc1811afb

DEMO MANUAL DC1811A

SCHEMATIC DIAGRAM

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