Microchip Technology MCP1630 NiMH User manual

©2005 Microchip Technology Inc. DS51564A
MCP1630 1A Bias Supply
Demo Board User’s Guide

DS51564A-page ii ©2005 Microchip Technology Inc.
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MCP1630 1A BIAS SUPPLY
DEMO BOARD USER’S GUIDE
©2005 Microchip Technology Inc. DS51564A-page iii
Table of Contents
Preface ...........................................................................................................................1
Chapter 1. Product Overview........................................................................................5
1.1 Introduction ...............................................................................................5
1.2 What is the MCP1630 1A Bias Supply Demo Board? .............................. 6
1.3 What the MCP1630 1A Bias Supply Demo Board Kit Includes ................6
Chapter 2. Installation and Operation ..........................................................................7
2.1 Introduction ...............................................................................................7
2.2 Features ...................................................................................................7
2.3 Getting Started ......................................................................................... 8
Appendix A. Schematic and Layouts ........................................................................11
A.1 Introduction .............................................................................................11
A.2 Board Schematic .................................................................................. 12
A.3 Board – Assembly Drawing ..................................................................13
A.4 Board – Top Overlay .............................................................................14
A.5 Board – Top Layer ................................................................................15
A.6 Board – Bottom Layer ......................................................................... 16
Appendix B. Bill-Of-Materials (BOM) .........................................................................17
Appendix C. Evaluation Board Firmware ..................................................................19
C.1 Device Firmware .....................................................................................19
Worldwide Sales and Service ....................................................................................20

MCP1630 1A Bias Supply Demo Board User’s Guide
DS51564A-page iv ©2005 Microchip Technology Inc.
NOTES:

MCP1630 1A BIAS SUPPLY
DEMO BOARD USER’S GUIDE
©2005 Microchip Technology Inc. DS51564A-page 1
Preface
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.
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.

MCP1630 1A Bias Supply Demo Board User’s Guide
DS51564A-page 2 ©2005 Microchip Technology Inc.
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description Represents Examples
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 <Enter>, <F1>
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) { ...
}

Preface
©2005 Microchip Technology Inc. DS51564A-page 3
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

MCP1630 1A Bias Supply Demo Board User’s Guide
DS51564A-page 4 ©2005 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
• 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.

MCP1630 1A BIAS SUPPLY
DEMO BOARD USER’S GUIDE
©2005 Microchip Technology Inc. DS51564A-page 5
Chapter 1. Product Overview
1.1 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.
9V, +/- 20%
Power
Supply
Bias
Supply System Load
Output
Maximum Output Current = 1A
+5V
Selectable
Output
Voltage
3
2
1
+3.3V

MCP1630 1A Bias Supply Demo Board User’s Guide
DS51564A-page 6 ©2005 Microchip Technology Inc.
1.2 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.
1.3 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)

MCP1630 1A BIAS SUPPLY
DEMO BOARD USER’S GUIDE
©2005 Microchip Technology Inc. DS51564A-page 7
Chapter 2. Installation and Operation
2.1 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).
2.2 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%

MCP1630 1A Bias Supply Demo Board User’s Guide
DS51564A-page 8 ©2005 Microchip Technology Inc.
2.3 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%).
2.3.1 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.
Input Power
Jack
Regulated
Output Voltage
Terminal Block
Programming
Header
Output Voltage
Selection
Header
-+
3.3V5.0V
R9
C9
R1
C6
R11
R5 R3
C1 C2
J3
R7
U2
Q1
C4 D1
C10
J4
U3
C7 C8
U1
C3 L1 J1
C5
R13
R10
R8
R6
C11
R12
D2
R4
R2
J2

Installation and Operation
©2005 Microchip Technology Inc. DS51564A-page 9
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.

MCP1630 1A Bias Supply Demo Board User’s Guide
DS51564A-page 10 ©2005 Microchip Technology Inc.
NOTES:

MCP1630 1A BIAS SUPPLY
DEMO BOARD USER’S GUIDE
©2005 Microchip Technology Inc. DS51564A-page 11
Appendix A. Schematic and Layouts
A.1 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

MCP1630 1A Bias Supply Demo Board User’s Guide
DS51564A-page 12 ©2005 Microchip Technology Inc.
A.2 BOARD SCHEMATIC
4
3
2
1GND 2OUT 3
VIN
AK
A K
6
1
5

Schematic and Layouts
©2005 Microchip Technology Inc. DS51564A-page 13
A.3 BOARD – ASSEMBLY DRAWING
3.3V5.0V
R9 C9
R1
C6
R11
R5 R3
C1 C2
J3
R7
U2
Q1
C4 D1
C10
J4
U3
C7 C8
U1
C3 L1 J1 C5
R13 R10 R8 R6
C11 R12
D2
R4
R2
J2
.
.
.
.

MCP1630 1A Bias Supply Demo Board User’s Guide
DS51564A-page 14 ©2005 Microchip Technology Inc.
A.4 BOARD – TOP OVERLAY
Scale = 2:1
3.3V5.0V
R9
C9
R1
C6
R11
R5 R3
C1 C2
J3
R7
U2
Q1
C4 D1
C10
J4
U3
C7 C8
U1
C3 L1 J1
C5
R13
R10
R8
R6
C11
R12
D2
R4
R2
J2

Schematic and Layouts
©2005 Microchip Technology Inc. DS51564A-page 15
A.5 BOARD – TOP LAYER
Scale = 2:1

MCP1630 1A Bias Supply Demo Board User’s Guide
DS51564A-page 16 ©2005 Microchip Technology Inc.
A.6 BOARD – BOTTOM LAYER
Scale = 2:1