Analog Devices Linear DC2681A-A Demo Manual
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Analog Devices Linear DC2681A-A Demo Manual

Analog Devices Linear DC2681A-A Demo Manual

Ltm4645 25a dc/dc step-down umodule regulator
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DESCRIPTION
Demonstration circuit DC2681A-A features the
®
LTM
4645EY, a 25A high efficiency, switch mode step-
®
down power µModule
range is from 6V to 15V. To use DC2681A-A for input
voltage range from 4.7V to 6V, connect INTV
(change R22 from OPT to 0Ω), DRV
R21 from 0Ω to OPT, R28 from OPT to 0Ω). The output
voltage range is 0.6V to 1.8V. Derating is necessary for
certain V
, V
, frequency and thermal conditions. The
IN
OUT
DC2681A-A offers the TRK/SS pin allowing the user to
program output tracking or soft-start period. The board
operates in continuous conduction mode in heavy load
conditions. For high efficiency at low load currents, the
MODE_PLLIN jumper selects pulse-skipping mode for
noise sensitive applications or burst mode operation in
BOARD PHOTO
regulator. The input voltage
to SV
CC
to V
(change
CC
IN
DEMO MANUAL DC2681A-A
25A DC/DC Step-Down
µModule Regulator
less noise sensitive applications. The MODE_PLLIN pin
also allows the
LTM4645
clock signal (between 400kHz and 800kHz). DC2681A-A
has the option of choosing both internal and external
compensation circuit for LTM4645. Tying the PHASMD
IN
pin to different voltage generates certain phase differ-
ence between MODE_PLLIN and CLKOUT. The LTM4645
data sheet must be read in conjunction with this demo
manual prior to working on or modifying demo circuit
DC2681A-A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2681A-A
L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of
Analog Devices, Inc. All other trademarks are the property of their respective owners.
LTM4645
to synchronize to an external
dc2681aaf
1

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Summary of Contents for Analog Devices Linear DC2681A-A

  • Page 1 MODE_PLLIN jumper selects pulse-skipping mode for L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. noise sensitive applications or burst mode operation in...

  • Page 2: Performance Summary

    DEMO MANUAL DC2681A-A PERFORMANCE SUMMARY PARAMETER CONDITIONS/NOTES VALUE Input Voltage Range 6V to 15V Output Voltages 1.0V ± 1.0% Maximum Continuous Output Current Derating is Necessary for Certain Operating 25ADC Conditions. See Data Sheet for Details Operating Frequency 600kHz Efficiency = 12V, V = 1.0V, I = 25A...
  • Page 3 DEMO MANUAL DC2681A-A QUICK START PROCEDURE – LOAD – – – dc2681aaf F01 Figure 1. Measurement Setup of DC2681A-A dc2681aaf...
  • Page 4 DEMO MANUAL DC2681A-A QUICK START PROCEDURE , 600kHz Efficiency Sweeps 90.00 88.00 86.00 84.00 82.00 80.00 78.00 76.00 0.8 V 74.00 1.0 V 1.2 V 72.00 1.5 V 1.8 V 70.00 0.00 5.00 10.00 15.00 20.00 25.00 OUTPUT CURRENT (A) dc2681aaf F02 Figure 2.
  • Page 5 DEMO MANUAL DC2681A-A QUICK START PROCEDURE Figure 4. Thermal Image of LTM4645 = 12V, V = 1.0V, I = 25A LOAD Ambient Temperature = 25.0°C, No Forced Air Flow dc2681aaf...

  • Page 6: Parts List

    DEMO MANUAL DC2681A-A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CIN1 CAP ., ALUM., 150µF, 35V, 20%, HVH SUN ELECTRONIC INDUSTRIES CORP ., 35HVH150MT CIN3, CIN4 CAP ., 22µF, X5R, 25V, 20%,1210 MURATA, GRM32ER61E226ME15L COUT1, COUT2, COUT4 CAP ., 100µF, X5R, 6.3V, 20%, 1210 MURATA,GRM32ER60J107ME20L COUT7, COUT8...

  • Page 7: Schematic Diagram

    DEMO MANUAL DC2681A-A SCHEMATIC DIAGRAM dc2681aaf Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 8 DEMO MANUAL DC2681A-A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use.

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