MCP1650 SEPIC
Demo Board User’s Guide
© 2005 Microchip Technology Inc.
DS51581A
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and may be superseded by updates.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 WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED,
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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.
Microchip received ISO/TS-16949:2002 quality system certification for
its worldwide headquarters, design and wafer fabrication facilities in
Chandler and Tempe, Arizona and Mountain View, California in
October 2003. The Company’s quality system processes and
procedures are for its PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
DS51581A-page ii
© 2005 Microchip Technology Inc.
MCP1650 SEPIC DEMO BOARD
USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Chapter 1. Product Overview ........................................................................................ 5
1.1
1.2
1.3
Introduction ............................................................................................... 5
What is the MCP1650 SEPIC Demo Board? ............................................ 5
What the MCP1650 SEPIC Demo Board Kit Includes .............................. 5
Chapter 2. Installation and Operation .......................................................................... 7
2.1
2.2
2.3
Introduction ............................................................................................... 7
Features ................................................................................................... 7
Getting Started ......................................................................................... 8
Appendix A. Schematic and Layout .......................................................................... 11
A.1
A.2
A.3
A.4
A.5
Introduction ............................................................................................. 11
Board Schematic .................................................................................. 12
Board – Top Overlay ............................................................................. 13
Board – Top Layer ................................................................................ 14
Board – Bottom Layer ......................................................................... 15
Appendix B. Bill Of Materials (BOM) ......................................................................... 17
Worldwide Sales and Service .................................................................................... 18
© 2005 Microchip Technology Inc.
DS51581A-page iii
MCP1650 SEPIC Demo Board User’s Guide
NOTES:
DS51581A-page iv
© 2005 Microchip Technology Inc.
MCP1650 SEPIC DEMO 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.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP1650 SEPIC 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 MCP1650 SEPIC Demo Board. The manual
layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP1650
SEPIC Demo Board.
• Chapter 2. “Installation and Operation” – Includes a description of the
evaluation board, as well as instructions on how to get started.
• Appendix A. “Schematic and Layout” – Shows the schematic and layout
diagrams for the MCP1650 SEPIC Demo Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP1650 SEPIC Demo Board.
© 2005 Microchip Technology Inc.
DS51581A-page 1
MCP1650 SEPIC Demo Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
Examples
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® IDE User’s Guide
...is the only compiler...
the Output window
the Settings dialog
select Enable Programmer
“Save project before build”
A dialog button
A tab
A key on the keyboard
Click OK
Click the Power tab
Press <Enter>, <F1>
Italic Courier New
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
Constants
A variable argument
Square brackets [ ]
Optional arguments
Curly brackets and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
0xFF, ‘A’
file.o, where file can be
any valid filename
mcc18 [options] file
[options]
errorlevel {0|1}
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents code supplied by
user
File>Save
var_name [,
var_name...]
void main (void)
{ ...
}
RECOMMENDED READING
This user's guide describes how to use the MCP1650 SEPIC Demo Board. The
following Microchip documents are available and recommended as supplemental
reference resources.
MCP1650/51/52/53 Data Sheet, “750 kHz Boost Controller” (DS21876)
This data sheet provides detailed information regarding the MCP1650/51/52/53 family
of boost controllers.
DS51581A-page 2
© 2005 Microchip Technology Inc.
Preface
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 (September 2005)
• Initial Release of this Document.
© 2005 Microchip Technology Inc.
DS51581A-page 3
MCP1650 SEPIC Demo Board User’s Guide
NOTES:
DS51581A-page 4
© 2005 Microchip Technology Inc.
MCP1650 SEPIC DEMO BOARD
USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
The MCP1650 SEPIC Demo Board is used to evaluate Microchip’s MCP1650 boost
controller in a low-power application that requires a regulated output voltage from an
input voltage that can be greater than, less than or equal to the output voltage. As provided, the MCP1650 SEPIC Demo Board generates a 5.0V output from a 3V to 7V
source.
This chapter covers the following topics:
• What is the MCP1650 SEPIC Demo Board?
• What the MCP1650 SEPIC Demo Board Kit Includes.
1.2
WHAT IS THE MCP1650 SEPIC DEMO BOARD?
The MCP1650 SEPIC Demo Board is a complete, step-up or step-down, Switch mode,
DC-DC power converter. The MCP1650 SEPIC Demo Board generates a regulated
5.0V output at load currents up to 160 mA. The SEPIC topology has the ability to
step-up or step-down the input voltage. The input voltage range for the MCP1650
SEPIC Demo Board is from 3.0V to 7.0V.
Test points are provided for input power, output load and shutdown control.
1.3
WHAT THE MCP1650 SEPIC DEMO BOARD KIT INCLUDES
This MCP1650 SEPIC Demo Board kit includes:
• The MCP1650 SEPIC Demo Board (102-00079)
• The MCP1650 SEPIC Demo Board User’s Guide (DS51581)
• MCP1650/51/52/53 Data Sheet, “750 kHz Boost Controller” (DS21876)
3V - 7V Input
SEPIC Topology
5V @ 160 mA
Load
MCP1650
FIGURE 1-1:
© 2005 Microchip Technology Inc.
MCP1650 SEPIC Demo Board Block Diagram.
DS51581A-page 5
MCP1650 SEPIC Demo Board User’s Guide
NOTES:
DS51581A-page 6
© 2005 Microchip Technology Inc.
MCP1650 SEPIC DEMO BOARD
USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP1650 SEPIC Demo Board demonstrates Microchip’s MCP1650 750 kHz
Boost Controller in an application that requires a regulated output voltage from a
source that is greater than, less than or equal to the regulated output voltage. The
MCP1650 is a gated oscillator boost controller developed for high-power, portable
applications. By driving an external MOSFET, the MCP1650 controller can deliver
5 watts of power to the load. The high switching frequency minimizes the size of the
external inductor and capacitor, saving both board space and cost.
The Single-Ended Primary Inductance Converter (SEPIC) topology utilized on this
board has the ability to produce a regulated output from a wide-ranging source. Some
advantages of the SEPIC topology versus other topologies are the low-ripple input
current, the ability to step-up or step-down the input voltage without inverting the output
voltage, no required transformer and the output is capacitively isolated from the input
to protect against switch failure.
2.2
FEATURES
The MCP1650 SEPIC Demo Board has the following features:
•
•
•
•
•
Wide input voltage range: 3.0V to 7.0V
Regulated 5.0V output voltage
Maximum output current: 160 mA
Complete low-profile, space-saving power supply
Test point to apply external Enable signal
© 2005 Microchip Technology Inc.
DS51581A-page 7
MCP1650 SEPIC Demo Board User’s Guide
2.3
GETTING STARTED
The MCP1650 SEPIC Demo Board is fully assembled and tested for generating a regulated 5.0V output voltage. The MCP1650 SEPIC Demo Board requires the use of an
external input voltage source (3.0V–7.0V).
2.3.1
Power Input and Output Connections
2.3.1.1
POWERING THE MCP1650 SEPIC DEMO BOARD
Apply the input voltage to the VIN (TP1) and GND (TP2) test points. The input voltage
should be limited to the 0V to +7.0V range. For normal operation, the input voltage must
be between +3.0V and +7.0V.
2.3.1.2
APPLY THE LOAD TO THE REGULATED OUTPUT VOLTAGE TEST
POINTS
1. To apply a load to the MCP1650 SEPIC Demo Board, the positive side (+) of the
load should be connected to the VOUT test point (TP4). The negative side (–) of
the load should be connected to the GND test point (TP5).
2. The maximum load current for the MCP1650 SEPIC Demo Board is 160 mA.
Applying a load greater than the stated maximum will cause the output voltage
to pull out of regulation.
2.3.1.3
ENABLING/DISABLING THE MCP1650 SEPIC DEMO BOARD
The SHDN pin of the MCP1650 is pulled-up to VIN so that the device is always enabled.
The SHDN test point (TP3) can be used to apply an external Enable signal to the
device. Pulling TP3 to ground will disable the part.
Connect output
ground to TP5
Connect input
voltage to TP1
Connect output
Connect input
load to TP4
ground to TP2
FIGURE 2-1:
DS51581A-page 8
MCP1650 SEPIC Demo Board Assembly Drawing.
© 2005 Microchip Technology Inc.
Installation and Operation
2.3.2
Evaluating the Application
The MCP1650 SEPIC Demo Board can be used to provide a low-cost, minimal size,
low-power bias circuit. A well-regulated 5V at 160 mA output is produced from a 3.0V
to 7.0V input source. This voltage range allows the source to be a single Li-Ion battery
or three to four NiMH batteries.
The SEPIC topology is employed to convert this wide-ranging input source to a
well-regulated 5 volts. The SEPIC has the ability to automatically buck or boost the
input source. By coupling the two inductors onto one magnetic core, a small footprint,
low parts-count, low-power step-up or step-down converter is developed.
To truly evaluate the effectiveness of the MCP1650 SEPIC Demo Board, the input voltage must be varied over the entire operating range, while the load is varied from 0A to
160 mA. Test points are provided for connecting the variable input voltage source (TP1
and TP2) and a variable load (TP4 and TP5). An additional test point (TP3) is connected to the shutdown pin (SHDN) of the MCP1650. On the board, the SHDN pin is
pulled-up to VIN. However, by connecting TP3 to GND, the converter can be disabled.
© 2005 Microchip Technology Inc.
DS51581A-page 9
MCP1650 SEPIC Demo Board User’s Guide
NOTES:
DS51581A-page 10
© 2005 Microchip Technology Inc.
MCP1650 SEPIC DEMO BOARD
USER’S GUIDE
Appendix A. Schematic and Layout
A.1
INTRODUCTION
This appendix contains the following schematic and layout diagrams for the MCP1650
SEPIC Demo Board:
•
•
•
•
Board Schematic
Board – Top Overlay
Board – Top Layer
Board – Bottom Layer
© 2005 Microchip Technology Inc.
DS51581A-page 11
MCP1650 SEPIC Demo Board User’s Guide
BOARD SCHEMATIC
D
2
A.2
1
G
S
3
DS51581A-page 12
© 2005 Microchip Technology Inc.
Schematic and Layout
A.3
BOARD – TOP OVERLAY
© 2005 Microchip Technology Inc.
DS51581A-page 13
MCP1650 SEPIC Demo Board User’s Guide
A.4
BOARD – TOP LAYER
DS51581A-page 14
© 2005 Microchip Technology Inc.
Schematic and Layout
A.5
BOARD – BOTTOM LAYER
© 2005 Microchip Technology Inc.
DS51581A-page 15
MCP1650 SEPIC Demo Board User’s Guide
NOTES:
DS51581A-page 16
© 2005 Microchip Technology Inc.
MCP1650 SEPIC DEMO BOARD
USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
Qty.
BILL OF MATERIALS (BOM)
Reference
Description
Mfgr.
Part Number
®
3
C1, C3, C4
4.7 μF, X5R Ceramic, 16V, 0805
Panasonic
1
C2
2.2 μF, X5R Ceramic, 16V, 0805
Panasonic
ECJ-2FB1C225K
1
L1
3.3 μH, Dual Inductor
Coiltronics®
DRQ73-3R3
1
D1
Schottky Diode, 30V, Dual
Philips Electronics
BAT54C
1
D2
Schottky Diode, 20V
Panasonic
MA2ZD1800L
1
Q1
N-Channel 20V 4.2A MOSFET
International Rectifier
IRLML2502
1
R5
10 KΩ, 1/10W, 1%, 0603
Rohm
MCR03EZPJ103
1
R1
27.4 KΩ, 1/10W, 1%, 0603
Rohm
MCR03EZPFX2742
1
R4
30.9 KΩ, 1/10W, 1%, 0603
Rohm
MCR03EZPFX3092
1
R2
100 KΩ, 1/10W, 1%, 0603
Rohm
MCR03EZPFX1003
1
R3
499 KΩ, 1/10W, 1%, 0603
Rohm
ECJ-2FB1C475K
MCR03EZPFX4993
®
5016
5
TP1,TP2, TP3, TP4, Test Point
TP5
Keystone Electronics
1
U1
Microchip Technology Inc. MCP1650R-E/MS
750 kHz, Boost Controller, MSOP
© 2005 Microchip Technology Inc.
DS51581A-page 17
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Fax: 66-2-694-1350
Toronto
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Canada
Tel: 905-673-0699
Fax: 905-673-6509
**DS51581A**
08/24/05
DS51581A-page 18
© 2005 Microchip Technology Inc.