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AN-1227 LM3485 Evaluation Board

User's Guide

Literature Number: SNVA052A

May 2004 – Revised May 2004

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Summary of Contents for LM3485

Page 1: ...AN 1227 LM3485 Evaluation Board User s Guide Literature Number SNVA052A May 2004 Revised May 2004 ...

Page 2: ... Introduction 5 2 Output Voltage Current Limit Setting 6 3 Layout Fundamentals 6 2 Table of Contents SNVA052A May 2004 Revised May 2004 Submit Documentation Feedback Copyright 2004 Texas Instruments Incorporated ...

Page 3: ...3V Output at 0 5A 5 2 Component Location Top Side 6 3 Top Layer 7 4 Bottom Layer 7 List of Tables 1 Bill of Materials 5 3 SNVA052A May 2004 Revised May 2004 List of Figures Submit Documentation Feedback Copyright 2004 Texas Instruments Incorporated ...

Page 4: ... to demonstrate the performance with a 3 3V output from a 12V source The demo board can be used with source voltages from 7V to 28V to deliver output load currents up to 1A By changing the size of a single resistor regulated output voltages from 1 242V to 5V can be obtained All trademarks are the property of their respective owners 4 AN 1227 LM3485 Evaluation Board SNVA052A May 2004 Revised May 20...

Page 5: ...3V Output at 0 5A Table 1 Bill of Materials Code Description Manufacturer C1 Input Capacitor CAP Tantalum 22µF 35V EEJL1VD226R Panasonic C2 Output Capacitor CAP POSCAP 100µF 6 3V 6TPC100M Sanyo C3 CADJ CAP Ceramic Chip 1nF 50V GRM39X7R102K50 Murata C4 Cff CAP Ceramic Chip 100pF 50V GRM39X7R101K50 Murata D1 Catch Diode Schottky Diode 1A 30V MBRS130T3 On Semiconductor L1 Inductor 22µH LQH66SN220M01L...

Page 6: ... should be implemented by following a few simple guidelines 1 Place the power components which are the MOSFET diode inductor and filter capacitors close together Make the traces between them as short and as wide as possible 2 Place the trace for the Gate of the external PFET as close as possible to the PGATE pin of the 6 AN 1227 LM3485 Evaluation Board SNVA052A May 2004 Revised May 2004 Submit Doc...

Page 7: ...ociated with the inductor 4 Keep the trace short between the ground pin of the input capacitor and the anode of the diode 5 Ensure the ground is low impedance Figure 3 Top Layer Figure 4 Bottom Layer 7 SNVA052A May 2004 Revised May 2004 AN 1227 LM3485 Evaluation Board Submit Documentation Feedback Copyright 2004 Texas Instruments Incorporated ...

Page 8: ...regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failures monitor failures and their consequence...

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