Microchip Technology dsPICDEM SMPS Buck Development Board User guide
dsPICDEM™ SMPS Buck
Development Board
User’s Guide
© 2006 Microchip Technology Inc. DS70181A
Note the following details of the code protection feature on Microchip devices:
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knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
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Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
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Information contained in this publication regarding device
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and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
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Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, K
EELOQ, 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,
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, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, ECAN,
ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active
Thermistor, Mindi, MiWi, MPASM, MPLIB, MPLINK, PICkit,
PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal,
PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB,
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in the U.S.A.
All other trademarks mentioned herein are property of their
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© 2006, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona, Gresham, Oregon and Mountain View, California. The
Company’s quality system processes and procedures are for its PIC
8-bit MCUs, KEELOQ
microperipherals, no nvolatile memory and analog products. In addition,
Microchip’s quality system for the design and manufacture of
development systems is ISO 9001:2000 certified.
®
code hopping devices, Serial EEPROMs,
DS70181A-page ii © 2006 Microchip Technology Inc.
®
dsPICDEM™ SMPS BUCK
DEVELOPMENT BOARD
USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Chapter 1. Introduction
1.1 Overview ........................................................................................................ 7
1.2 dsPICDEM™ SMPS Buck Development Board Kit ........................................ 8
1.3 dsPICDEM™ SMPS Buck Development Board Features .............................. 8
Chapter 2. Hardware Overview
2.1 Connectors ................................................................................................... 11
2.2 User Interface Hardware .............................................................................. 14
2.3 Program or Debug Selection Switch (SW2) ................................................. 17
Chapter 3. Using the dsPIC30F2020 Device
3.1 Tutorial Overview ......................................................................................... 19
3.2 Creating the Project ...................................................................................... 19
3.3 Building the Code ......................................................................................... 26
3.4 Programming the Chip ................................................................................. 28
3.5 Debugging the Code .................................................................................... 33
Chapter 4. Demonstration Program Operation
4.1 Demonstration Program ............................................................................... 37
4.2 Demonstration Code .................................................................................... 39
4.3 Other Code Examples .................................................................................. 40
Appendix A. Schematic and Layouts
Index ............................................................................................................................. 45
Worldwide Sales and Service .................................................................................... 46
© 2006 Microchip Technology Inc. DS70181A-page iii
dsPICDEM™ SMPS Buck Development Board
NOTES:
DS70181A-page iv © 2006 Microchip Technology Inc.
dsPICDEM™ SMPS BUCK
DEVELOPMENT BOARD
USER’S GUIDE
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.
For the most up-to-date information on development tools, see the MPLAB
Select the Help menu, and then Topics to open a list of available on-line help files.
®
IDE on-line help.
This document contains general information that is useful to know before using the
dsPICDEM™ SMPS Buck Development Board.
Items discussed in this preface include:
• About this Guide
• Conventions Used in this Guide
• Warranty Registration
• Recommended Reading
• The Microchip Web Site
• Development Systems Customer Change Notification Service
• Customer Support
• Document Revision History
ABOUT THIS GUIDE
This document describes how to use the dsPICDEM™ SMPS Buck Development
Board development tool. The manual layout is as follows:
• Chapter 1. “Introduction” – This chapter introduces the dsPICDEM™ SMPS
Buck Development Board and provides a brief descriptions of the hardware.
• Chapter 2. “Hardware Overview” – This chapter describes the dsPICDEM™
SMPS Buck Development Board hardware.
• Chapter 3. “Using the dsPIC30F2020 Device” – This chapter goes through a
basic step by step process for getting your dsPICDEM™ SMPS Buck Development Board up and running with the MPLAB
a dsPIC30F2020 device.
• Chapter 4. “Demonstration Program Operation” – This chapter describes the
operation of the dsPICDEM™ SMPS Buck Development Board.
• Appendix A. “Schematic and Layouts” – This section illustrates the
dsPICDEM™ SMPS Buck Development Board layout and provides hardware
schematic diagrams.
®
In-Circuit Debugger 2 (ICD 2) using
© 2006 Microchip Technology Inc. DS70181A-page 1
dsPICDEM™ SMPS Buck Development Board
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description Represents Examples
Arial font:
Italic characters Referenced books MPLAB
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
Underlined, italic text with
right angle bracket
Bold characters A dialog button Click OK
N‘Rnnnn A number in verilog format,
Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>
Courier New font:
Plain Courier New Sample source code #define START
Italic Courier New A variable argument file.o, where file can be
Square brackets [ ] Optional arguments mcc18 [options] file
Curly brackets and pipe
character: { | }
Ellipses... Replaces repeated text var_name [,
A menu path File>Save
A tab Click the Power tab
where N is the total number of
digits, R is the radix and n is a
digit.
Filenames autoexec.bat
File paths c:\mcc18\h
Keywords _asm, _endasm, static
Command-line options -Opa+, -Opa-
Bit values 0, 1
Constants 0xFF, ‘A’
Choice of mutually exclusive
arguments; an OR selection
Represents code supplied by
user
®
IDE User’s Guide
“Save project before build”
4‘b0010, 2‘hF1
any valid filename
[options]
errorlevel {0|1}
var_name...]
void main (void)
{ ...
}
DS70181A-page 2 © 2006 Microchip Technology Inc.
WARRANTY REGISTRATION
Please complete the enclosed Warranty Registration Card and mail it promptly.
Sending in the Warranty Registration Card entitles users to receive new product
updates. Interim software releases are available at the Microchip web site.
RECOMMENDED READING
This user's guide describes how to use the dsPICDEM™ SMPS Buck Development
Board. Other useful documents are listed below. The following Microchip documents
are available and recommended as supplemental reference resources.
Readme Files
For the latest information on using other tools, read the tool-specific Readme files in
the Readmes subdirectory of the MPLAB IDE installation directory. The Readme files
contain update information and known issues that may not be included in this user’s
guide.
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
Preface
© 2006 Microchip Technology Inc. DS70181A-page 3
dsPICDEM™ SMPS Buck Development Board
DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE
Microchip’s customer notification service helps keep customers current on Microchip
products. Subscribers will receive e-mail notification whenever there are changes,
updates, revisions or errata related to a specified product family or development tool of
interest.
To register, access the Microchip web site at www.microchip.com, click on Customer
Change Notification and follow the registration instructions.
The Development Systems product group categories are:
• Compilers – The latest information on Microchip C compilers and other language
tools. These include the MPLAB C18 and MPLAB C30 C compilers; MPASM™
and MPLAB ASM30 assemblers; MPLINK™ and MPLAB LINK30 object linkers;
and MPLIB™ and MPLAB LIB30 object librarians.
• Emulators – The latest information on Microchip in-circuit emulators.This
includes the MPLAB ICE 2000 and MPLAB ICE 4000.
• In-Circuit Debuggers – The latest information on the Microchip in-circuit
debugger, MPLAB ICD 2.
• MPLAB
Integrated Development Environment for development systems tools. This list is
focused on the MPLAB IDE, MPLAB SIM simulator, MPLAB IDE Project Manager
and general editing and debugging features.
• Programmers – The latest information on Microchip programmers. These include
the MPLAB PM3 and PRO MATE
Plus and PICkit
®
IDE – The latest information on Microchip MPLAB IDE, the Windows®
®
™
1 development programmers.
II device programmers and the PICSTART®
DS70181A-page 4 © 2006 Microchip Technology Inc.
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
• Distributor or Representative
• Local Sales Office
• Field Application Engineer (FAE)
• Technical Support
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
Preface
© 2006 Microchip Technology Inc. DS70181A-page 5
dsPICDEM™ SMPS Buck Development Board
DOCUMENT REVISION HISTORY
Revision A (October 2006)
• Initial Release of this Document.
DS70181A-page 6 © 2006 Microchip Technology Inc.
Modern power supplies are becoming smaller, more efficient, more flexible and less
costly. These desirable enhancements have come about as digital signal controllers
have been incorporated into Switched Mode Power Supply (SMPS) designs. Buck
converters are used when the desired output voltage is smaller than the input voltage.
This chapter introduces and provides an overview of the dsPICDEM™ SMPS Buck
Development Board. Topics covered include:
•Overview
• dsPICDEM™ SMPS Buck Development Board Kit
• dsPICDEM™ SMPS Buck Development Board Features
1.1 OVERVIEW
Figure 1-1 is a block diagram of the dsPICDEM™ SMPS Buck Development Board, A
dsPIC30F2020 DSC controls two independent DC/DC synchronous buck converters,
providing closed-loop Proportional, Integral, Derivative (PID) control in software to
maintain desired output voltage levels. The dsPIC
sary memory and peripherals for A/D conversion, PWM generation and general
purpose I/O, precluding the need to perform these functions in external circuitry.
dsPICDEM™ SMPS BUCK
DEVELOPMENT BOARD
Chapter 1. Introduction
®
DSC device provides the neces-
USER’S GUIDE
FIGURE 1-1: SYNCHRONOUS BUCK CONVERTER BLOCK DIAGRAM
LOADBUCK CONVERTER 1
IN
V
Communication
AN4
dsPIC30F2020
AN0
AN1
OC1
AN2
AN3
V
DD
PWM1H
PWM1L
I1
V1
Vg
PWM2H
PWM2L
I2
V2
VIN
I1
V1
VG
BUCK CONVERTER 2
VIN
I2
V2
VOUT1
VOUT2
© 2006 Microchip Technology Inc. DS70181A-page 7
dsPICDEM™ SMPS Buck Development Board
dsPIC DSC SMPS devices are specifically designed to provide low-cost, efficient control of a wide range of power supply topologies. Their specialized peripherals facilitate
closed-loop feedback control of switched mode power supplies while also providing
communications for remote monitoring and supervisory control.
The dsPICDEM™ SMPS Buck Development Board aids in rapid development of multiple buck converters using dsPIC30F1010/2020 Digital Signal Controllers. The
dsPIC30F1010/2020 devices offer these features and capabilities:
• Integrated program and data memory on a single chip
• Ultra fast interrupt response time and hardware interrupt priority logic
• 2000 ksps, on-chip ADC with four dedicated sample/hold circuits for multiple loop
control
• Four independent, high-resolution PWM generators specially designed to support
different power topology
• Four analog comparators for system protection
• On-chip system communications (I
• On-chip RC oscillator for lower system cost
• High-current sink/source I/O pins: 25 mA/25mA
• 30 MIPS performance CPU
1.2 dsPICDEM™ SMPS BUCK DEVELOPMENT BOARD KIT
2
C/SPI/UART)
The dsPICDEM™ SMPS Buck Development Board kit contains these items:
• dsPICDEM™ SMPS Buck Development Board
• dsPICDEM™ SMPS Buck Development Board CD containing example code and
relevant documentation
1.3 dsPICDEM™ SMPS BUCK DEVELOPMENT BOARD FEATURES
The dsPICDEM™ SMPS Buck Development Board incorporates these features:
1.3.1 Power Stages
• Two synchronous buck converter power stages
• Voltage/current measurement for digital control of buck converters
• In-rush current limiting
• Switchable 5Ω/5W resistive load on VOUT1
• Buck Converter 1 output (VOUT1) on J1 connector for external loading
• Buck Converter 2 output (VOUT2) on J2 connector for external loading
1.3.2 Input/Output Controls
• Three 5 kΩ Potentiometers (R29,R30 and R35)
• Two push button switches (S2 and S4)
• Master Clear push button switch (S3)
• LED indicator (LED3)
DS70181A-page 8 © 2006 Microchip Technology Inc.
Introduction
1.3.3 Development Board Power
• Auxiliary power input (P1and P2) – 7V to 15V (9V nominal)
• 9 volt power input (J2)
Note: This power input is compatible with the 9 volt power supply that is part of
the MPLAB ICD 2 In-Circuit Debugger (DV164007).
• LED power-on indicator (LED1)
• On-board 5V DC, low-dropout regulator
1.3.4 Communication Ports
• One RS232 port (J6)
• MPLAB ICD 2 programming connector (J5)
• SW2 selection of programming interface to the MPLAB ICD 2
Debugger/Programmer
© 2006 Microchip Technology Inc. DS70181A-page 9
dsPICDEM™ SMPS Buck Development Board
NOTES:
DS70181A-page 10 © 2006 Microchip Technology Inc.
Chapter 2. Hardware Overview
This chapter describes the dsPICDEM™ SMPS Buck Development Board
hardware elements and identifies the hardware components. The topics covered
include:
• Connectors
• User Interface Hardware
• Program or Debug Selection Switch (SW2)
2.1 CONNECTORS
Figure 2-1 shows the hardware connection (MPLAB ICD 2 and power supply) to the
dsPICDEM™ SMPS Buck Development Board.
dsPICDEM™ SMPS BUCK
DEVELOPMENT BOARD
USER’S GUIDE
FIGURE 2-1: dsPICDEM™ SMPS BUCK DEVELOPMENT BOARD
CONNECTED TO MPLAB
Expansion
Header
6
®
ICD 2 AND POWER SUPPLY
ICD Connector
3
RS232 Connector
VOUT Connectors
5
4
VOUT2
VOUT1
Input Power Connector
1
2
TABLE 2-1: BUCK CONVERTER BOARD CONNECTORS
No Hardware Elements
1 Input Power Connector (J2)
2 RS232 connector (J6)
3 Programming/debugging connector (J5)
4 VOUT1 Connector (J1)
5 VOUT2 Connector (J3)
6 Expansion Header (J7)
© 2006 Microchip Technology Inc. DS70181A-page 11
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