Analog Devices DC542A Manuel utilisateur

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 542

DUAL PHASE, DUAL OUTPUT SYNCHRONOUS BUCK CONVERTER

LTC3728EG

DESCRIPTION

Demonstration circuit 542 is a dual output, dual

phase step down converter, which is controlled

by the LTC3728EG. Output #1 can be configured

for either 5.0V or 3.3V and output #2 can be

configured for either 3.3V or 2.5V. The maximum

load for both rails is 12A. The input voltage

range of the DC542 is 8V to 24V.

The DC542 also contains a footprint for a 5.5V

boost converter bias supply whose output is

connected to EXTVCC. See the “Optional Bias

Supply” section for more details.

Design files for this circuit board are avail-

able. Call the LTC factory.

Table 1.Performance Summary

PARAMETER CONDITION VALUE

Minimum Input Voltage 8V

Maximum Input Voltage 24V

OUT1

= 8V to 24V, I

OUT

= 0A to 12A 5.0V ± 3% / 3.3V ± 3%

OUT2

= 8V to 24V, I

OUT

= 0A to 12A 3.3V ± 3% / 2.5V ± 3%

QUICK START PROCEDURE

Demonstration circuit 542 is easy to set up. Re-

fer to Figure 1 for the proper setup of the meas-

urement equipment and follow the procedure

below:

1. With power off, connect the input voltage

source and the load. The load cables should

be sized for 12 Amps and the input cables

should be sized for 15 Amps.

2. The jumpers should be placed in their default

positions as shown in Figure 1.

3. If a constant current electronic load is used,

preset the load current to about 1A or less

before applying power to the input. Other-

wise, the foldback current limit function of the

LTC3728 may be triggered during startup.

4. Apply power to the input and set the input

voltage to 12V. The voltage for output #1

should be 5.0V ± 3% and the voltage for out-

put #2 should be 3.3V ± 3%. Increase the

load on both rails to 12.0A. The two outputs

should still be within regulation.

5. Keep the input voltage at 12.0V and the load

at 12.0A for both rails. Measure the DC input

current. It should be less than 9.4A.

6. Remove input power from the converter. Set

the voltage for output #1 to 3.3V using

jumper JP5 and the voltage for output #2 to

2.5V using JP4. Repeat step #4. The voltage

for output #1 should be 3.3V ± 3% and the

voltage for output #2 should be 2.5V ± 3%.

7. Adjust the input voltage and load current to

the desired levels within their limits and ob-

serve the regulation, output ripple, load step

response, efficiency and other parameters.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 542

DUAL PHASE, DUAL OUTPUT SYNCHRONOUS BUCK CONVERTER

Note: When measuring the output voltage ripple,

care must be taken to avoid a long ground lead

on the oscilloscope probe. Connect the probe tip

to VOUT and the probe’s ground ring to GND.

Make the connections as short as possible. For

output #1, measure the ripple directly across

C35 and for output #2, measure across C36.

See Figure 2.

Figure 1. Setup for measurement equipment.

Figure 2. Output ripple measurement.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 542

DUAL PHASE, DUAL OUTPUT SYNCHRONOUS BUCK CONVERTER

OPTIONAL BIAS SUPPLY

The DC542 also contains a footprint for a 5.5V

boost converter bias supply whose output is

connected to EXTVCC. The input of this bias

supply can be connected to one of the following:

1) VIN, if VIN<5V

2) VOUT1 for VOUT1 <5V and VIN>5V.

The latter connection will provide higher effi-

ciency. If this bias supply is stuffed, please keep

the following points in mind:

1) If the input voltage of the optional bias supply

is connected to VIN, then the board will need

to be slightly modified to ensure that the

voltage on the EXTVCC pin of the

LTC3728EG does not exceed the voltage on

the VIN pin. These are the modifications:

a) Remove resistor R8.

b) Tie the (+) end of C3 to the (+) end of

C21.

2) If the input voltage of the optional bias supply

is connected to output #1, precautions need

to be taken to make sure that the voltage on

the EXTVCC pin of the LTC3728EG does not

exceed the voltage on the VIN pin during

turn-on of the main converter. Follow the

steps below:

a) Put jumper JP6 in the “0” position to tie

the RUN1 signal to ground.

b) Turn-on the main input voltage and set to

desired level.

c) Put jumper JP6 in the “1” position to turn-

on output #1.

3) If a different power MOSFET configuration is

used or the switching frequency is increased,

then be sure to measure the current flowing

into the EXTVCC pin and make sure the cur-

rent will not exceed the maximum output cur-

rent of the bias supply. At 3.3V input, the

maximum output current of the bias supply is

200mA.

For further assistance, contact the factory.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 542

DUAL PHASE, DUAL OUTPUT SYNCHRONOUS BUCK CONVERTER

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 542

DUAL PHASE, DUAL OUTPUT SYNCHRONOUS BUCK CONVERTER

X-ON Electronics

Largest Supplier of Electrical and Electronic Components

Click to view similar products for Power Management IC Development Tools category:

Click to view products by Analog Devices manufacturer:

Other Similar products are found below :

EVAL-ADM1168LQEBZ EVB-EP5348UI MIC23451-AAAYFL EV MIC5281YMME EV DA9063-EVAL ADP122-3.3-EVALZ ADP130-

0.8-EVALZ ADP130-1.2-EVALZ ADP130-1.5-EVALZ ADP130-1.8-EVALZ ADP1714-3.3-EVALZ ADP1716-2.5-EVALZ ADP1740-1.5-

EVALZ ADP1752-1.5-EVALZ ADP1828LC-EVALZ ADP1870-0.3-EVALZ ADP1871-0.6-EVALZ ADP1873-0.6-EVALZ ADP1874-0.3-

EVALZ ADP1882-1.0-EVALZ ADP199CB-EVALZ ADP2102-1.25-EVALZ ADP2102-1.875EVALZ ADP2102-1.8-EVALZ ADP2102-2-

EVALZ ADP2102-3-EVALZ ADP2102-4-EVALZ ADP2106-1.8-EVALZ ADP2147CB-110EVALZ AS3606-DB BQ24010EVM

BQ24075TEVM BQ24155EVM BQ24157EVM-697 BQ24160EVM-742 BQ24296MEVM-655 BQ25010EVM BQ3055EVM

NCV891330PD50GEVB ISLUSBI2CKIT1Z LM2744EVAL LM2854EVAL LM3658SD-AEV/NOPB LM3658SDEV/NOPB LM3691TL-

1.8EV/NOPB LM4510SDEV/NOPB LM5033SD-EVAL LP38512TS-1.8EV EVAL-ADM1186-1MBZ EVAL-ADM1186-2MBZ

Autres manuels Analog Devices Carte mère

Analog Devices

Analog Devices EVAL-AD5325DBZ Manuel utilisateur

Analog Devices

Analog Devices Hittite HMC764LP6CE Manuel utilisateur

Analog Devices

Analog Devices ADSP-BF526 EZ-Board Manuel utilisateur

Analog Devices

Analog Devices DC336 Manuel utilisateur

Analog Devices

Analog Devices EV1HMC6832ALP5L Manuel utilisateur

Analog Devices

Analog Devices AD-FMCMOTCON1-EBZ Manuel utilisateur

Analog Devices

Analog Devices AD9739A-EBZ Manuel utilisateur

Analog Devices

Analog Devices ADRF5519-EVALZ Manuel utilisateur

Analog Devices

Analog Devices EVAL-ADAU1466Z Manuel utilisateur

Analog Devices

Analog Devices ADP5034 Manuel utilisateur

Analog Devices

Analog Devices EVAL-ADGS1412SDZ Manuel utilisateur

Analog Devices

Analog Devices SHARC ADSP-21375 Manuel utilisateur

Analog Devices

Analog Devices ADSP-BF561 EZ-KIT Lite Manuel utilisateur

Analog Devices

Analog Devices ADSP-BF518F EZ-Board Manuel utilisateur

Analog Devices

Analog Devices ADAU1772 Manuel utilisateur

Analog Devices

Analog Devices EVAL-ADAU1401AEBZ Manuel utilisateur

Analog Devices

Analog Devices AD9858PCB Manuel utilisateur

Analog Devices

Analog Devices SSM2167 Instructions d'installation et d'utilisation

Analog Devices

Analog Devices EZ-KIT Lite ADSP-BF538F Guide de l'utilisateur

Analog Devices

Analog Devices EVAL-ADM1075MEBZ Manuel utilisateur

Analog Devices

Analog Devices EV-ADF4360-8EB1Z Manuel utilisateur

Analog Devices

Analog Devices Hittite HMC900LP5E Manuel utilisateur

Analog Devices

Analog Devices MAX17614 Manuel utilisateur

Analog Devices

Analog Devices EVAL-ADAU1861 Manuel utilisateur

Manuels Carte mère populaires d'autres marques

DFI

DFI SD170 Manuel utilisateur

ASROCK

ASROCK ROMED8-2T Manuel utilisateur

Asus

Asus P2L97A Manuel utilisateur

Winmate

Winmate IC70 Manuel utilisateur

Asus

Asus MES-B Manuel utilisateur

Grantech

Grantech SYS8F377VGGA-3OMN Manuel utilisateur

Telit Wireless Solutions

Telit Wireless Solutions SL869-3DR Manuel utilisateur

Gigabyte

Gigabyte GA-9IVDT Manuel utilisateur

Texas Instruments

Texas Instruments ADS8372EVM Manuel utilisateur

Commell

Commell MS-C73 Manuel utilisateur

IBT Technologies

IBT Technologies MB860 Manuel utilisateur

Nvidia

Nvidia TEGRA DG-04927-001_V01 Manuel utilisateur

Biostar

Biostar M7VIT Bravo Instructions d'utilisation et d'installation

Intel

Intel D33217CK Manuel utilisateur

Asus

Asus F1A55-M LX PLUS R2.0 Manuel utilisateur

EPC

EPC EPC9147C Manuel utilisateur

Asus

Asus EX-B760M-V5 D4 Manuel utilisateur

EPOX

EPOX MU-8KHA0010 Manuel utilisateur