MICROCHIP MCP1630 1A Bias Supply Demo Board User Guide

MICROCHIP MCP1630 1A Bias Supply Demo Board

MICROCHIP MCP1630 1A Bias Supply Demo Board User’s Guide

DS51564A
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

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The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, PICMASTER, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance and WiperLock are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their respective companies.

Printed on recycled paper.
DS51564A-page ii Downloaded from Arrow.com.

MCP1630 1A BIAS SUPPLY DEMO BOARD USER’S GUIDE

Product Overview
The MCP1630 1A Bias Supply Demo Board is a product developed by Microchip Technology Incorporated. It is designed to demonstrate the functionality and features of the MCP1630 1A Bias Supply. The demo board is intended to be used for evaluation, testing, and learning purposes.

What is the MCP1630 1A Bias Supply Demo Board?
The MCP1630 1A Bias Supply Demo Board is a complete system that showcases the capabilities of the MCP1630 1A Bias Supply. It provides a platform for users to understand the performance and behavior of the bias supply in various applications.

What the MCP1630 1A Bias Supply Demo Board Kit Includes
The MCP1630 1A Bias Supply Demo Board Kit includes:

• MCP1630 1A Bias Supply Demo Board
• User’s Guide (DS51564A)
• Schematic and Layouts (Appendix A)
• Bill-Of-Materials (BOM) (Appendix B)
• Evaluation Board Firmware (Appendix C)

Installation and Operation

Features
The MCP1630 1A Bias Supply Demo Board offers the following features:

• Complete system for evaluating the MCP1630 1A Bias Supply
• Demonstrates the functionality and performance of the bias supply
• Designed for easy installation and operation

Getting Started
To get started with the MCP1630 1A Bias Supply Demo Board, follow these steps:

1. Ensure that you have all the components included in the kit.
2. Refer to the Schematic and Layouts (Appendix A) for a better understanding of the board’s design.
3. Review the Bill-Of-Materials (BOM) (Appendix B) to ensure that all necessary components are present.
4. Install the Evaluation Board Firmware (Appendix C) onto the demo board.
5. Connect the necessary power supply and load to the demo board.
6. Follow the instructions provided in the User’s Guide (DS51564A) for detailed information on operating the demo board.

For any further assistance or inquiries, please refer to the Worldwide Sales and Service section.

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WAR-RANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip’s products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.

Trademarks
The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.
AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, PICMASTER, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance and WiperLock are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their respective companies.
© 2005, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved.

Printed on recycled paper.

Preface

NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available.
Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is
“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the document.

INTRODUCTION
This chapter contains general information that will be useful to know before using the MCP1630 1A Bias Supply Demo Board. Items discussed in this chapter include:

• Document Layout
• Conventions Used in this Guide
• Recommended Reading
• The Microchip Web Site
• Customer Support
• Document Revision History

DOCUMENT LAYOUT
This document describes how to use the MCP1630 1A Bias Supply Demo Board. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP1630 1A Bias Supply Demo Board.
• Chapter 2. “Installation and Operation” – Includes a description of the demo board, as well as instructions on how to get started.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout diagrams for the MCP1630 1A Bias Supply Demo Board.
• Appendix B. “Bill-Of-Materials (BOM)” – Lists the parts used to build the MCP1630 1A Bias Supply Demo Board.
• Appendix C. “Evaluation Board Firmware” – Provides information about the application firmware and the location of the source code.

CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Arial font:
Italic characters| Referenced books| MPLAB ® IDE User’s Guide
Emphasized text| …is the only compiler…
Initial caps| A window| the Output window
A dialog| the Settings dialog
A menu selection| select Enable Programmer
Quotes| A field name in a window or dialog| “Save project before build”
Underlined, italic text with right angle bracket| A menu path| File>Save
Bold characters| A dialog button| Click OK
A tab| Click the Power tab
Text in angle brackets < >| A key on the keyboard| Press ,
Courier font:
Plain Courier| Sample source code| #define START
Filenames| autoexec.bat
File paths| c:\mcc18\h
Keywords| _asm, _endasm, static
Command-line options| -Opa+, -Opa-
Bit values| 0, 1
Constants| 0xFF, ‘A’
Italic Courier| A variable argument| file.o, where file can be any valid filename
Square brackets [ ]| Optional arguments| mcc18 [options] file [options]
Curly brackets and pipe character: { | }| Choice of mutually exclusive arguments; an OR selection| errorlevel {0|1}
Ellipses…| Replaces repeated text| var_name [, var_name…]
Represents code supplied by user| void main (void)

{ …

}

RECOMMENDED READING
This user’s guide describes how to use MCP1630 1A Bias Supply Demo Board. The following Microchip documents are available and recommended as supplemental reference resources.
MCP1630 Data Sheet, “High-Speed, Microcontroller-Adaptable, Pulse Width Modulator”, (DS21896)
This data sheet provides detailed information regarding the MCP1630 product family.
MCP1701 Data Sheet, “2 µA Low-Dropout Positive Voltage Regulator”, (DS21874)
This data sheet provides detailed information regarding the MCP1701 product family.
PIC10F200 Data Sheet, “6-Pin, 8-Bit Flash Microcontrollers”, (DS41239)
This data sheet provides detailed information regarding the PIC10F200 product family.

THE MICROCHIP WEB SITE
Microchip provides online support via our web site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains the following information:

• Product Support – Data sheets and errata, application notes and sample programs, design resources, user’s guides and hardware support documents, latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical support requests, online discussion groups, Microchip consultant program member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives

CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:

• Distributor or Representative
• Local Sales Office
• Field Application Engineer (FAE)
• Technical Support
• Development Systems Information Line

Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document.
Technical support is available through the web site at: http://support.microchip.com

DOCUMENT REVISION HISTORY
Revision A (June 2005)

• Initial Release of this Document.

Overview

INTRODUCTION
The MCP1630 1A Bias Supply Demo Board is used to evaluate Microchip’s MCP1630 in a SEPIC power converter application. As provided, the MCP1630 1A Bias Supply Demo Board generates a 3.3V or 5.0V output from an input voltage of 9V, +20%. The MCP1630 1A Bias Supply Demo Board provides a regulated output for load currents up to 1A.

This chapter covers the following topics:

• What is the MCP1630 1A Bias Supply Demo Board?
  What the MCP1630 1A Bias Supply Demo Board Kit Includes

FIGURE 1-1: MCP1630 1A Bias Supply Demo Board System Block Diagram.

WHAT IS THE MCP1630 1A BIAS SUPPLY DEMO BOARD?
The MCP1630 1A Bias Supply Demo Board is a complete, step-down, switch-mode, dc-dc power converter. The MCP1630 1A Bias Supply Demo Board generates a regulated output voltage for systems requiring a bias of 3.3V or 5V at load currents up to 1A. Different output voltages can be obtained with minor modifications to the firmware and/or hardware.
This board utilizes Microchip’s MCP1630 (High-Speed PIC® MCU PWM MSOP8), MCP1701 (Low-Dropout Linear Regulator SOT-23A) and PIC10F200 (Flash MCU SOT23-6). The input voltage range for the demo board is 7.2V to 11.8V. The output is capable of providing up to 1A constant output current.
An input power jack is provided to apply the input voltage to the bias supply. An output header is provided as a means to connect the external system load. A programming header is available for updating the firmware contained in the PIC10F200.

WHAT THE MCP1630 1A BIAS SUPPLY DEMO BOARD KIT INCLUDES
This MCP1630 1A Bias Supply Demo Board Kit includes:

• The MCP1630 1A Bias Supply Demo Board Board (102-00046)
• MCP1630 1A Bias Supply Demo Board User’s Guide (DS51564A).
• MCP1630 Data Sheet, “High-Speed, Microcontroller-Adaptable, Pulse Width Modulator”, (DS21896)
• MCP1701 Data Sheet, “2 µA Low-Dropout Positive Voltage Regulator”, (DS21874)
• PIC10F200 Data Sheet, “6-Pin, 8-Bit Flash Microcontrollers”, (DS41239)

Installation and Operation

INTRODUCTION
The MCP1630 1A Bias Supply Demo Board demonstrates Microchip’s MCP1630 high- speed Pulse Width Modulator (PWM) used in a step-down, switch-mode, dc-dc power converter. The MCP1630 is a high-speed, microcontroller-adaptable PWM. When used in conjunction with a microcontroller, the MCP1630 will control the power system duty cycle to provide output voltage or current regulation. The PIC10F200 microcontroller can be used to regulate output voltage or current, switching frequency and maximum duty cycle. The MCP1630 generates duty cycle and provides fast overcurrent protection based on various external inputs. External signals include the input oscillator, the reference voltage, the feedback voltage and the current sense. The output signal is a square-wave pulse. The power train used for the MCP1630 1A Bias Supply Demo Board is a Single-Ended Primary Inductive Converter (SEPIC).

FEATURES
The MCP1630 1A Bias Supply Demo Board has the following features:

• Selectable regulated output voltage: 3.3V or 5.0V
• Maximum output current: 1A
• Foldback current limiting
• Cycle-by-cycle peak current limit
• Output present indicator
• Soft-start capability by holding the reference voltage low during power-up
• The MCP1630 1A Bias Supply Demo Board has the flexibility to modify the regulated output voltage, optimize the soft-start time or disable the output by modifying the firmware contained in the PIC10F200
• Proprietary features can be added by modifying the firmware contained in the PIC10F200
• The factory-programmed source code is available
• Adaptable to environmental effects such as ambient temperature
• Typical efficiency: 85%

GETTING STARTED
The MCP1630 1A Bias Supply Demo Board is fully assembled and tested for generating a regulated, selectable 3.3V or 5.0V output voltage. The MCP1630 1A Bias Supply Demo Board requires the use of an external input voltage source (+9V, +20%).

Power Input and Output Connections
Powering the MCP1630 1A Bias Supply Demo Board

1. Apply the input voltage to the input power jack (J2). The input voltage source should be limited to the 0V to +11.8V range. For normal operation, the input voltage should be between +7.2V and +11.8V, not to exceed an absolute maximum of +12V.
2. The inside portion of the input power plug must be positive. The outer jacket of the input power plug must be negative. Refer to Figure 2-1.

FIGURE 2-1: Set-Up Configuration Diagram.

Apply the load to the regulated output voltage terminal block

1. To apply a load to the MCP1630 1A Bias Supply Demo Board, the positive side (+) of the load should be connected to pin 2 of J1. The negative side (–) of the load should be connected to pin 1 of J1. Care should be taken when using electronic loads.

Regulated output voltage selection

1. The regulated output voltage can be selected to be either 3.3V or 5.0V. The regulated output voltage is selected by placing a shorting jumper on the Output Voltage Selection Header (J3). By shorting pins 1 and 2, the regulated output voltage will be 3.3V. By shorting pins 2 and 3, the regulated output voltage will be 5.0V.
2. If a shorting jumper is not present, the regulated output voltage will default to 5.0V.
3. The output voltage selection input is read by the PIC10F200 at power-up only. Therefore, the output voltage cannot be changed dynamically without modification of the factory-installed firmware. Input power must be removed or cycled in order for a change to take effect.

Output voltage present indication
The MCP1630 1A Bias Supply Demo Board has a LED to indicate the presence of output voltage. The LED will be illuminated when the output voltage is present.

Programming
Header J4 is provided for in-system circuit programming.

Appendix A. Schematic and Layouts

INTRODUCTION
This appendix contains the following schematics and layouts for the MCP1630 1A Bias Supply Demo Board:

• Board Schematic
• Board – Assembly Drawing
• Board – Top Overlay
• Board – Top Layer
• Board – Bottom Layer

A.2 BOARD SCHEMATIC

A.3 BOARD – ASSEMBLY DRAWING

A.4 BOARD – TOP OVERLAY

A.5 BOARD – TOP LAYER

A.6 BOARD – BOTTOM LAYER

Appendix B. Bill-Of-Materials (BOM)

TABLE B-1: BILL-OF-MATERIALS (BOM)

1725656
1| J2| Connector Power Jack, 2.5 x 5.5 mm, SMD| CUI Inc.| PJ-002B-SMT
1| J3| Connector Header, 3 Pos., 2.54 mm, HDR1X3| Molex®/Waldom®| 22-03-2031
1| J4| Connector Header, 5 Pos., 2.54 mm, HDR1X5| Molex| 22-03-2051
1| L1| 8.2 µH, Coupled Inductor, DRQ74| Coiltronics®| DRQ74-8R2
1| Q1| Dual N-Channel MOSFET, SOT23-6| Siliconix| Si3900DV-T1
1| R1| 22.1, 1/16W, 1%, Chip Resistor, 0603| Panasonic-ECG| ERJ-3EKF22R1V
3| R2,R8,R10| 1.00k, 1/16W, 1%, Chip Resistor, 0603| Panasonic-ECG| ERJ- 3EKF1001V
1| R3| 4.75k, 1/16W, 1%, Chip Resistor, 0603| Panasonic-ECG| ERJ-3EKF4751V
1| R4| 10.0, 1/16W, 1%, Chip Resistor, 0603| Panasonic-ECG| ERJ-3EKF10R0V
1| R5| 787k, 1/16W, 1%, Chip Resistor, 0603| Panasonic-ECG| ERJ-3EKF7873V
2| R6,R11| 15.0k, 1/16W, 1%, Chip Resistor, 0603| Panasonic-ECG| ERJ-3EKF1502V
2| R7,R9| 7.87k, 1/16W, 1%, Chip Resistor, 0603| Panasonic-ECG| ERJ-3EKF7871V
1| R12| 47.5k, 1/16W, 1%, Chip Resistor, 0603| Panasonic-ECG| ERJ-3EKF4752V
1| R13| 100k, 1/16W, 1%, Chip Resistor, 0603| Panasonic-ECG| ERJ-3EKF1003V
1| U1| 5.0V, 250 mA, Voltage Regulator, SOT23| Microchip Technology Inc.| MCP1701T-5002I/CB
1| U2| PWM Building Block, MSOP8| Microchip Technology Inc.| MCP1630-E/MS
1| U3| 8-Bit Flash Microcontroller, SOT23-6| Microchip Technology Inc.| PIC10F200T-I/OT
1| | Shorting Jumper, 2 Pos., 2.54mm| Sullins™| STC025YAN

Appendix C. Evaluation Board Firmware

C.1 DEVICE FIRMWARE
For the latest copy of the MCP1630 1A Bias Supply Demo Board firmware, visit our web site at www.microchip.com.

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