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Summary of Contents for Microchip Technology MCP1661
- Page 1 MCP1661 Isolated Flyback Converter Reference Design 2014-2022 Microchip Technology Inc. and its subsidiaries DS50002313B...
- Page 2 Microchip intellectual property rights unless otherwise stated. GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies.
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Page 3: Table Of Contents
1.2 MCP1661 Device Short Overview ..............9 1.3 Flyback Converter Topology Overview ............10 1.4 What is The MCP1661 Isolated Flyback Converter Reference Design? ..11 1.5 What Does The MCP1661 Isolated Flyback Converter Reference Design Kit Include? ................. 11 Chapter 2. - Page 4 MCP1661 Isolated Flyback Converter Reference Design NOTES: 2014-2022 Microchip Technology Inc. and its subsidiaries DS50002313B-page 4...
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Page 5: Preface
Customer Support • Document Revision History DOCUMENT LAYOUT This document describes how to use the MCP1661 Isolated Flyback Converter Reference Design as a development tool. The manual layout is as follows: • Chapter 1. “Product Overview” – Important information about the MCP1661 Isolated Flyback Converter Reference Design. -
Page 6: Conventions Used In This Guide
Choice of mutually exclusive errorlevel {0|1} character: { | } arguments; an OR selection Ellipses... Replaces repeated text var_name [, var_name...] Represents code supplied by void main (void) user { ... 2014-2022 Microchip Technology Inc. and its subsidiaries DS50002313B-page 6... -
Page 7: Recommended Reading
Preface RECOMMENDED READING This user’s guide describes how to use MCP1661 Isolated Flyback Converter Reference Design. Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference resources. • MCP1661 – “High-Voltage Integrated Switch PWM Boost Regulator with UVLO”... - Page 8 MCP1661 Isolated Flyback Converter Reference Design NOTES: 2014-2022 Microchip Technology Inc. and its subsidiaries DS50002313B-page 8...
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Page 9: Chapter 1. Product Overview
MCP1661 ISOLATED FLYBACK CONVERTER REFERENCE DESIGN Chapter 1. Product Overview INTRODUCTION This chapter provides an overview of the MCP1661 Isolated Flyback Converter Reference Design and covers the following topics: • MCP1661 Device Short Overview • Flyback Converter Topology Overview •... -
Page 10: Flyback Converter Topology Overview
Therefore, in order to overcome this and provide smooth regulation, an LDO was added at the isolated output of the flyback converter. 2014-2022 Microchip Technology Inc. and its subsidiaries DS50002313B-page 10... -
Page 11: What Is The Mcp1661 Isolated Flyback Converter Reference Design
WHAT IS THE MCP1661 ISOLATED FLYBACK CONVERTER REFERENCE DESIGN? The MCP1661 Isolated Flyback Converter Reference Design is used to evaluate and demonstrate Microchip Technology’s MCP1661 in the following topology: • 5V output Isolated Flyback Converter application supplied from 5V typical input voltage. - Page 12 MCP1661 Isolated Flyback Converter Reference Design NOTES: 2014-2022 Microchip Technology Inc. and its subsidiaries DS50002313B-page 12...
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Page 13: Chapter 2. Installation And Operation
MCP1661 can regulate the output voltage up to 32V and can deliver 125 mA typical load at 3.3V input and 12V output. At light loads, MCP1661 skips pulses in order to keep the output voltage in regulation, but the voltage ripple is maintained low. - Page 14 MCP1661 Isolated Flyback Converter Reference Design This application uses MCP1661 as an open-loop flyback converter, the primary winding of the transformer being used as inductor for the boost converter that clamps the primary output voltage (V ) at around 13.5V. It is very important (for a normal...
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Page 15: Getting Started
Good efficiency is obtained at high load currents due to the decrease of the output voltage before the LDO (V OUTS GETTING STARTED The MCP1661 Flyback Converter Reference Design is fully assembled and tested to evaluate and demonstrate the MCP1661 family of products. 2.2.1 Powering the MCP1661 Isolated Flyback Converter Reference... - Page 16 The board has several test points that help engineers analyze the switch node’s waveforms or MCP1661’s output: • The test point of the MCP1661 device’s switch node (SW). • V test point shows the MCP1661 boost’s output voltage (this output is OUTP regulated).
- Page 17 Conduction Mode waveforms (50 mA load at 5V input voltage). Secondary Side Switching Voltage 10V/div Primary Side Switching Voltage 10V/div 2 µs/div FIGURE 2-5: Switching Nodes (Primary Side and Secondary Side) in Discontinuous Conduction Mode (No Load). 2014-2022 Microchip Technology Inc. and its subsidiaries DS50002313B-page 17...
- Page 18 2 µs/div FIGURE 2-6: Switching Nodes (Primary Side and Secondary Side) in Continuous Conduction Mode (50 mA Load Current). Figure 2-7 shows the start-up waveforms for MCP1661 Isolated Flyback Converter at 150 mA load current. Input Current 100 mA/div Output Voltage...
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Page 19: Appendix A. Schematic And Layouts
MCP1661 ISOLATED FLYBACK CONVERTER REFERENCE DESIGN Appendix A. Schematic and Layouts INTRODUCTION This appendix contains the following schematics and layouts for the MCP1661 Isolated Flyback Converter Reference Design: • Board – Schematic • Board – Top Silk • Board – Top Copper and Silk •... -
Page 20: Board - Schematic
BOARD – SCHEMATIC VOUTS VOUT = 5V MCP1755/5V VOUT VOUT VOUT MBR0530T1G CINS COUTS 10uF 1210 0805 0805 SGND 750310799 SGND SGND SGND VIN = 5V VOUTP MBR0530T1G MCP1661 100k 0805 COUT 5.6k 0805 0805 10uF 0805 1210... -
Page 21: Board - Top Silk
Schematic and Layouts BOARD – TOP SILK BOARD – TOP COPPER AND SILK 2014-2022 Microchip Technology Inc. and its subsidiaries 2014-2022 Microchip Technology Inc. and its subsidiaries DS50002313B-page 21 DS50002313B-page 21... -
Page 22: Board - Top Copper
MCP1661 Isolated Flyback Converter Reference Design BOARD – TOP COPPER BOARD – BOTTOM COPPER 2014-2022 Microchip Technology Inc. and its subsidiaries DS50002313B-page 22... -
Page 23: Appendix B. Bill Of Materials
Header, 2.54 mm, Vertical, THT Samtec, Inc. TSW-101-05-T-S Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM used in manufacturing uses all RoHS-compliant components. 2014-2022 Microchip Technology Inc. and its subsidiaries DS50002313B-page 23... -
Page 24: Worldwide Sales And Service
Tel: 46-31-704-60-40 Tel: 631-435-6000 Sweden - Stockholm San Jose, CA Tel: 46-8-5090-4654 Tel: 408-735-9110 UK - Wokingham Tel: 408-436-4270 Tel: 44-118-921-5800 Canada - Toronto Fax: 44-118-921-5820 Tel: 905-695-1980 Fax: 905-695-2078 2014-2022 Microchip Technology Inc. and its subsidiaries DS50002313B-page 24...
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