MCP1630 Coupled Inductor
Boost Converter
Demo Board
User’s Guide
© 2006 Microchip Technology Inc.
DS51612A
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DS51612A-page ii
© 2006 Microchip Technology Inc.
MCP1630 COUPLED INDUCTOR BOOST
CONVERTER DEMO BOARD USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Introduction............................................................................................................ 1
Document Layout .................................................................................................. 1
Conventions Used in this Guide ............................................................................ 2
Recommended Reading........................................................................................ 2
The Microchip Web Site ........................................................................................ 3
Customer Support ................................................................................................. 3
Document Revision History ................................................................................... 3
Chapter 1. Product Overview ....................................................................................... 5
1.1 Introduction ..................................................................................................... 5
1.2 What is the MCP1630 Coupled Inductor Boost Converter Demo Board? ...... 6
1.3 What The MCP1630 Coupled Inductor Boost Converter 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 – Top Silk Layer ............................................................................... 13
A.4 Board – Top Metal Layer ............................................................................ 14
A.5 Board – Bottom Metal Layer ..................................................................... 15
Appendix B. Bill Of Materials (BOM) ......................................................................... 17
Appendix C. Demo Board Firmware .......................................................................... 19
C.1 Device Firmware .......................................................................................... 19
Worldwide Sales and Service .................................................................................... 22
© 2006 Microchip Technology Inc.
DS51612A-page iii
MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide
NOTES:
DS51612A-page iv
© 2006 Microchip Technology Inc.
MCP1630 COUPLED INDUCTOR BOOST
CONVERTER 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.
For the most up-to-date information on development tools, see the MPLAB® IDE on-line help.
Select the Help menu, and then Topics to open a list of available on-line help files.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP1630 Coupled Inductor Boost Converter 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 Coupled Inductor Boost Converter
Demo Board. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP1630
Coupled Inductor Boost Converter Demo Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with this user’s guide and a description of the user’s guide.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP1630 Coupled Inductor Boost Converter Demo Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP1630 Coupled Inductor Boost Converter Demo Board.
• Appendix C. “Demo Board Firmware” – Provides information about the
application firmware and where the source code can be found.
© 2006 Microchip Technology Inc.
DS51612A-page 1
MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
‘bnnnn
Text in angle brackets < >
Courier font:
Plain Courier
Italic Courier
0xnnnn
Square brackets [ ]
Curly brackets and pipe
character: { | }
Ellipses...
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 binary number where n is a
digit
A key on the keyboard
Click OK
Click the Power tab
‘b00100, ‘b10
File>Save
Press <Enter>, <F1>
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
A variable argument
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
file.o, where file can be
any valid filename
A hexadecimal number where 0xFFFF, 0x007A
n is a hexadecimal digit
Optional arguments
mcc18 [options] file
[options]
Choice of mutually exclusive errorlevel {0|1}
arguments; an OR selection
Replaces repeated text
var_name [,
var_name...]
Represents code supplied by void main (void)
user
{ ...
}
RECOMMENDED READING
The following Microchip documents are available and recommended as supplemental
reference resources:
MCP1630/MCP1630V Data Sheet, "High-Speed, Microcontroller-Adaptable, Pulse
Width Modulator" (DS21896)
This data sheet provides detailed information regarding the MCP1630/MCP1630V
product family.
PIC12F683 Data Sheet, "8-Pin Flash-Based, 8-Bit CMOS Microcontrollers with
Nano Watt Technology" (DS41211)
This data sheet provides detailed information regarding the PIC12F683 product family.
DS51612A-page 2
© 2006 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
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• Business of Microchip – Product selector and ordering guides, latest Microchip
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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
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.
In addition, there is a Development Systems Information Line which lists the latest
versions of Microchip's development systems software products. This line also
provides information on how customers can receive currently available upgrade kits.
The Development Systems Information Line numbers are:
1-800-755-2345 – United States and most of Canada
1-480-792-7302 – Other International Locations
DOCUMENT REVISION HISTORY
Revision A (June 2006)
• Initial Release of this Document.
© 2006 Microchip Technology Inc.
DS51612A-page 3
MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide
NOTES:
DS51612A-page 4
© 2006 Microchip Technology Inc.
MCP1630 COUPLED INDUCTOR BOOST
CONVERTER DEMO BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
In certain applications, a higher output voltage is required that needs to be driven from
a lower Input voltage (i.e., 3V). The selection of switching device for these applications
is faced with certain problems which are listed below.
• The high voltage MOSFET's generally do not operate with a low 3V gate drive
• The larger drain-source capacitance of high-voltage MOSFET's requires energy in
the inductor to slew drain to output voltage, thus resulting in a loss in efficiency
• The high voltage MOSFET's with low gate drive voltage are a rare commodity
compared to their lower voltage counterparts. For example, a high voltage
MOSFET of 40V to 60V is generally available with a gate drive voltage of 5-10V,
whereas, it's difficult to locate a high voltage MOSFET of 40V to 60V with a lower
gate drive of 3V. Also, high voltage MOSFET's are large and more expensive than
their low voltage counterparts
The MCP1630 Coupled Inductor Boost Converter Demo Board reduces the
drain-to-source voltage on the main boost converter switch. This allows the use of low
gate threshold voltage switches for high voltage output boost applications.
The MCP1630 is a high-speed, microcontroller-adaptable, Pulse Width Modulator
(PWM). A coupled Inductor boost design with an MCP1630 device provides a viable
solution for obtaining high output voltages with low gate drive voltage.
This chapter covers the following topics.
• What is the MCP1630 Coupled Inductor Boost Converter Demo Board?
• What the MCP1630 Coupled Inductor Boost Converter Demo Board Kit includes
MCP1630 High-Speed,
Microcontroller adaptable,
Pulse width Modulator
Input Voltage
3.0V - 5.5V
© 2006 Microchip Technology Inc.
Load
15V - 40V
0 mA - 30 mA
1W max.
PIC12F683 for Osc Input
and VREF
Push Button
Switch
FIGURE 1-1:
Diagram.
Coupled Inductor
Boost Converter
Temp Sensor
MCP9700
MCP1630 Coupled Inductor Boost Converter Demo Board Block
DS51612A-page 5
MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide
1.2
WHAT IS THE MCP1630 COUPLED INDUCTOR BOOST CONVERTER DEMO
BOARD?
The MCP1630 Coupled Inductor Boost Converter Demo Board demonstrates the use
of a conventional boost topology with a coupled inductor. The center of the coupled
inductor tap is connected to the Boost switch. The voltage stress on the MOSFET is
reduced because the coupled inductor acts as a step-down auto transformer that
reduces the reflection of output voltage which the MOSFET encounters. The voltage
on the switching node is equal to the output voltage divided by the turn's ratio. The
coupled inductor with a turn's ratio 1:1 will reduce the stress on the Boost switch to
one-half. The demo board also serves as a platform to evaluate the MCP1630 device.
The inputs of the MCP1630 device are easily attached to the I/O pins of an MCU. The
MCU supplies the oscillator pulses and reference voltage to the MCP1630 device to
provide the most flexible and adaptable power system. The power system switching
frequency and maximum duty cycle are set using the I/O pins of the MCU. The reference input can be external, a Digital-to-Analog Converter (DAC) output or as simple as
an I/O output from the MCU. This enables the power system to adapt to many external
signals and variables in order to optimize performance and facilitate calibration.
The MCP1630 device demonstrates the use of Microchip's high-speed microcontroller-adaptable PWM integrated with the PIC12F683 (Flash MCU SOIC8) in coupled
inductor applications. Under normal operation, the supply ranges between 3.0V - 5.5V.
The output voltage can be varied from 15V to 40V at 0 mA -30 mA with a maximum
output power of 1W. The output voltage can be adjusted from 15V to 40V in 5V steps
using a push button switch, S1, with 2% regulation. An MCP9700 Linear Active Thermistor™ device is provided on-board, which can be used to monitor the ambient temperature and accordingly regulate the output voltage depending on the thermal
reading.
1.3
WHAT THE MCP1630 COUPLED INDUCTOR BOOST CONVERTER DEMO
BOARD KIT INCLUDES
This MCP1630 Coupled Inductor Boost Converter Demo Board Kit includes:
• MCP1630 Coupled Inductor Boost Converter Demo Board (102-00091)
• MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide (DS51612)
DS51612A-page 6
© 2006 Microchip Technology Inc.
MCP1630 COUPLED INDUCTOR BOOST
CONVERTER DEMO BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP1630 Coupled Inductor Boost Converter Demo Board demonstrates
Microchip's High-Speed Pulse Width Modulator (PWM) used in a coupled inductor
design. When used in conjunction with a microcontroller, the MCP1630 device will
control the power system duty cycle to provide different regulated output voltages using
push button S1. The PIC12F683 microcontroller is used to generate oscillator pulses,
reference voltage and output voltage selection using push button S1. The PIC12F683
can also be programmed to monitor the board ambient temperature using the
MCP9700 Linear Active Thermistor™ device and provide different regulated output
voltages for different thermal readings. The MCP1630 device generates duty cycle
based on various external inputs. External signals include the input oscillator pulses,
reference voltage from PIC12F683 device, and the feedback voltage. The output signal
is a square-wave pulse given to drive the MOSFET.
The PIC12F683 microcontroller is programmable, allowing the user to modify or
develop their own firmware routines to further evaluate the MCP1630 device in this
application.
2.2
FEATURES
The MCP1630 Coupled Inductor Boost Converter Demo Board has the following
features.
• With reduced stress on the MOSFET switch, provides greater degree of freedom
in selecting the MOSFET
• Provides a varied output voltage selection from 15V to 40V in steps of 5V
• Push button select option for the required output voltage selection and ON/OFF
control
• Tight line and load regulation and high efficiency over entire operating input
voltage range
• PIC12F683 microcontroller is used to generate the Oscillator pulse and reference
voltage at required duty cycle
• MCP9700 Linear Active Thermistor device for monitoring the temperature and
output voltage control
• Proprietary features can be added by modifying the firmware contained in the
PIC12F683 microcontroller
• The factory programmed source code is available
© 2006 Microchip Technology Inc.
DS51612A-page 7
MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide
2.3
GETTING STARTED
The MCP1630 Coupled Inductor Boost Converter Demo Board is fully assembled and
tested. The board requires the use of an external input voltage source (3.0V to 5.5V)
and external load of Max 1W.
2.3.1
Power Input and Output Connection
2.3.1.1
POWERING THE MCP1630 COUPLED INDUCTOR BOOST
CONVERTER DEMO BOARD
1. Connect the positive side of the input source (+) to TP1. Connect the negative or
return side (-) of input source to TP2. Refer to Figure 2-1. The input voltage
source should be limited from 3.0V to 5.5V range. As the input voltage is applied
and the system powers up, the firmware program of the PIC12F683 device will
initialize and help the converter remain in low-power sleep mode (<0.1 µA) until
the S1 push button is pressed for > 2 seconds by the user. If the S1 push button
is pressed for less than 2 seconds, the converter will not power up.
2. Once the S1 push button is pressed for 2 seconds, the MCP1630 Coupled
Inductor Boost Converter Demo Board is powered on delivering an output
voltage of 40V with a maximum power of 1W. The S1 push button can also be
used to provide a variable output voltage from 40V to 15V in 5V steps. Each
depression of the S1 push button for <2 seconds (short key press) after the
converter is enabled will provide a decrementing output voltage from 40V to 15V
range in reducing 5V steps in cyclic order.
3. At any of the output voltages, if the S1 push button is pressed for more than 2
seconds, the MCP1630 Coupled Inductor Boost Converter Demo Board goes
into low power sleep mode, turning the converter off.
4. Again, a subsequent depressing of the S1 push button for more than 2 seconds
wakes the converter from sleep mode and the output is powered at 40V.
Output +
Input +
Output -
Input -
FIGURE 2-1:
DS51612A-page 8
Setup Configuration Diagram.
© 2006 Microchip Technology Inc.
Installation and Operation
2.3.1.2
APPLYING LOAD TO MCP1630 COUPLED INDUCTOR BOOST
CONVERTER DEMO BOARD
A variable resistive load can be used to verify the line and load regulation. The load
resistance is connected between the TP3 and TP4 test points. To measure the output
voltage, connect the common lead of the multi meter to TP4 and the positive terminal
to TP3. By varying the load, the load regulation can be verified by measuring the output
voltage over the entire load range of 0 mA to 30 mA. Similarly, by varying the line
voltage from 3V to 5.5V and checking the output voltage, the line regulation can be
calculated.
Evaluating the Application
The best way to evaluate the MCP1630 Coupled Inductor Boost Converter Demo
Board is to dig into the circuit. Measure voltages and currents with a Digital Volt Meter
(DVM) and probe the board with an oscilloscope.
The voltage on the switching node can be calculated below.
N
N1 + N2
2
V SW = V IN + ( V OUT + V D – V IN ) -------------------
Where:
VSW
=
Voltage across switch
VOUT
=
Output Voltage
VD
=
Diode Drop
VIN
=
Input Voltage
N1 & N2
=
Coupled Inductor Turns Ratio
(N1 and N2 is 1 for a 1:1 ratio coupled inductor)
Firmware
The PIC12F683 device comes preprogrammed with firmware to operate the system as
described above. The firmware flow diagram is shown in Appendix C. “Demo Board
Firmware”.
The program is fairly simple and straight forward. There is an initialization routine at the
beginning of the program.
The internal oscillator clock is set to 8 MHz.The TRISIO is configured to set GP2
(Oscillator pulses to the MCP1630) and GP5 (VREF Voltage to MCP1630) as an output
port and GP3 (Push button S1) as Input Port.The OPTION register is configured to
wake-up on Port pin change of GP3.
The TMR0 is initialized with a value which causes TMR0 to overflow after 10 ms The
TMR0 overflow interrupt is also enabled. Initialize registers TEMP and TEMP2 for 2
seconds time measurement.
TMR0 overflow occurs for every 10 ms.
TEMP and TEMP2 counts for 2 seconds (TEMP2 = 10, TEMP = 20)
Hence 10 * 20 * 10 ms = 2 Seconds)
The PWM duty cycle is specified by writing to the CCPR1L register and to the
CCP1CON <5:4> bits. The CCPR1L contains the eight MSbs and the CCP1CON <5:4>
contains the two LSbs. This 10-bit value is represented by CCPR1L:CCP1CON <5:4>.
The switching frequency is set to 100 kHz.
© 2006 Microchip Technology Inc.
DS51612A-page 9
MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide
Upon powering on, the processor enters into SLEEP mode after the ports are initialized
and registers configured. The processor wakes-up from SLEEP mode if the push
button S1 on GP3 is pressed. TEMP and TEMP2 registers check weather the push
button S1 is pressed for more than 2 seconds. If the push button S1 is pressed for less
than 2 seconds, will not allow the TEMP1 register to set, which indicates that the push
button is not pressed for more than 2 seconds and the processor goes back to SLEEP
mode.
Once the processor is on after the push button is pressed for 2 seconds, the output
voltage is set at 40V by generating VREF Voltage. TMR1 is configured for generating
VREF Voltage. The duty cycle and period values are loaded to generate different VREF
Voltages.
Period is fixed for 508 µs ~= 1.94 kHz.
Off Time (Duty cycle) is varied from 308 µs to 508 µs.
Off time @ Duty Cycle
=
00 is 00 µs (For 40V Output)
=
10 is 64 µs (For 35V Output)
20 is 128 µs (For 30V Output)
30 is 192 µs (For 25V Output)
40 is 256 µs (For 20V Output)
50 is 320 µs (For 15V Output)
=
=
=
=
Each short depression of push button S1 will load different duty cycles to generate
different VREF voltages which decrements the output voltage from 40V to 15V in
reducing steps of 5V in cyclic order. A key debounce delay of 300 ms is introduced
between each short push button depressions.
At any of the output voltages, if the push button S1 is pressed for more than 2 seconds,
the processor goes into SLEEP mode by clearing the TEMP1 register.
Again, a subsequent depression of push button S1 for more than 2 seconds wakes the
processor form SLEEP mode by setting the TEMP1 register and output is powered at
40V.
The firmware program in the PIC12F683 device can be edited to modify the operation
of the application.
An additional feature can be incorporated in the firmware program where one can vary
the output voltage depending on the board ambient temperature. The MCP9700 Linear
Active Thermistor provided on-board can be directly interfaced to a MCU, and the
firmware suitably modified to achieve the objective.This feature is presently not
implemented in this demo board.
Programming
Header J1 is provided for in-circuit programming. This is an optional feature, since the
MCP1630 Coupled Inductor Boost Converter Demo Board comes preprogrammed with
firmware to operate the system. The PIC12F683 device can be reprogrammed with the
Baseline Flash Microcontroller Programmer (BFMP).
DS51612A-page 10
© 2006 Microchip Technology Inc.
MCP1630 COUPLED INDUCTOR BOOST
CONVERTER DEMO BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP1630 Coupled
Inductor Boost Converter Demo Board:
•
•
•
•
Board – Schematic
Board – Top Silk Layer
Board – Top Metal Layer
Board – Bottom Metal Layer
© 2006 Microchip Technology Inc.
DS51612A-page 11
MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide
A.2
BOARD – SCHEMATIC
2
1
3
DS51612A-page 12
© 2006 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP SILK LAYER
© 2006 Microchip Technology Inc.
DS51612A-page 13
MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide
A.4
BOARD – TOP METAL LAYER
DS51612A-page 14
© 2006 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – BOTTOM METAL LAYER
© 2006 Microchip Technology Inc.
DS51612A-page 15
MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide
NOTES:
DS51612A-page 16
© 2006 Microchip Technology Inc.
MCP1630 COUPLED INDUCTOR BOOST
CONVERTER DEMO BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacture
®
Part Number
2
C1, C2
Cap 10uF 6.3V Ceramic X5R 0805
Panasonic - ECG
ECJ-2FB0J106M
5
C3, C4, C5,
C9, C10
Cap 0.1uF 16V Ceramic X7R 0805
Panasonic - ECG
ECJ-2VB1C104K
1
C6
Cap 1uF 16V Ceramic 0805 X5R
Panasonic - ECG
ECJ-2FB1C105K
1
C7
Cap Ceramic1800pF 50V NPO 0805
Panasonic - ECG
ECJ-2VC1H182J
1
C8
Cap 1000pF 50V Cerm Chip 0805
Panasonic - ECG
ECJ-2VC1H102J
2
C11, C12
Cap 4.7uF 50V Ceramic F 1210
Panasonic - ECG
ECJ-4YF1H475Z
1
C13
Cap 9.0pF 50V Cerm Chip 0805 SMD Panasonic - ECG
ECJ-2VC1H090D
1
D1
Diode Schottky 60V 1A SMB
International Rectifier
10BQ060PBF
1
J1
Conn Header 5 Pos.100 Vert Tin
Molex® Electronics
22-03-2051
1
F1
Polyswitch Resettable Fuses
Keystone Electronics
MINISMDC110F-2
1
L1
Inductor shield dual 22uH SMD
Coiltronics/
Div of Cooper/Bussmann
DRQ74-220-R
1
Q1
MOSFET N-CH 30V 2.2A SSOT3
Fairchild Semiconductor®
FDN337N
1
Q2
MOSFET N-CH 60V 280mA SOT-23
Fairchild Semiconductor
NDS7002A
1
R1
Res 12.0K Ohm 1/8W 5% 0805 SMD
Panasonic - ECG
ERJ-6GEYJ123V
1
R2
Res 562K Ohm 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF5623V
1
R3
Res 15.0K Ohm 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF1502V
1
R4
Res 100K Ohm 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF1003V
1
R5
Res 49.9K Ohm 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF4992V
2
R6,R9
Res 47.5K Ohm 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF4752V
1
R7
Res 634K Ohm 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF6343V
1
R8
Res 36.0K Ohm 1/8W 5% 0805 SMD
Panasonic - ECG
ERJ-6GEYJ363V
0
R10
Not Used
—
—
1
S1
Momentary Tact Switches
E-Switch Inc.
TL3301NF260QG
5
TP1,TP2,TP3,
TP4,TP5
PC Test point compact SMT
Keystone Electronics®
5016
1
U1
IC LDO REG 250mA 2.5V SOT-23
Microchip Technology Inc.
MCP1700T-2502E/TT
1
U2
IC Sensor Thermal 2.3V SC70-5
Microchip Technology Inc.
MCP9700T-E/LT
1
U3
IC MCU Flash 2KX14 8SOIC
Microchip Technology Inc.
PIC12F683-I/SN
1
U4
IC PWM HS MCU-Adaptable 8MSOP
Microchip Technology Inc.
MCP1630-E/MS
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.
© 2006 Microchip Technology Inc.
DS51612A-page 17
MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide
NOTES:
DS51612A-page 18
© 2006 Microchip Technology Inc.
MCP1630 COUPLED INDUCTOR BOOST
CONVERTER DEMO BOARD USER’S GUIDE
Appendix C. Demo Board Firmware
C.1
DEVICE FIRMWARE
For the latest version of the MCP1630 Coupled Inductor Boost Converter Demo Board
firmware, visit the Microchip web site at www.microchip.com.
Start
Initialise Registers
Initialise TMR0 for 10 ms and Enable TMR0 Overflow Interrupts
Configure GPIO<3> as Input and Enable Port change Interrupt for this Pin
Configure GPIO<2,5> as Output Ports
Configure PWM
A
Go to SLEEP Mode
Check for Key Press
Wake up from SLEEP
on key press
No
Yes
Check for GPIO<3> Pressed
for > 2 seconds
No
Yes
Start the PWM Pulses at
100 kHz Frequency
Start the VREF Signal
B
© 2006 Microchip Technology Inc.
DS51612A-page 19
MCP1630 Coupled Inductor Boost Converter Demo Board User’s Guide
B
C
Load Period = 508 µs (1.9 kHz)
Duty Cycle = 0
Load Period = 508 µs (1.9 kHz)
Duty Cycle = 192 µs
Initialize Timer 1
Initialize Timer 1
Start the VREF Signal Pulses
Start the VREF Signal Pulses
No
No
GPIO<3> Pressed
GPIO<3> Pressed
Yes
A
Yes
GPIO<3>
Pressed for
> 2 sec
Yes
A
Yes
No
No
Key De-bounce Delay 300 ms
Key De-bounce Delay 300 ms
Load Period = 508 µs (1.9 kHz)
Duty Cycle = 64 µs
Load Period = 508 µs (1.9 kHz)
Duty Cycle = 256 µs
Initialize Timer 1
Initialize Timer 1
Start the VREF Signal Pulses
Start the VREF Signal Pulses
No
No
GPIO<3> Pressed
Yes
A
Yes
GPIO<3>
Pressed for
> 2 sec
A
No
Key De-bounce Delay 300 ms
Load Period = 508 µs (1.9 kHz)
Duty Cycle = 128 µs
Load Period = 508 µs (1.9 kHz)
Duty Cycle = 320 µs
Initialize Timer 1
Start the VREF Signal Pulses
Start the VREF Signal Pulses
No
No
GPIO<3> Pressed
Yes
GPIO<3>
Pressed for
> 2 sec
No
Key De-bounce Delay 300 ms
C
GPIO<3> Pressed
Yes
Yes
DS51612A-page 20
GPIO<3>
Pressed for
> 2 sec
Key De-bounce Delay 300 ms
Initialize Timer 1
FIGURE C-1:
GPIO<3> Pressed
Yes
Yes
No
A
GPIO<3>
Pressed for
> 2 sec
A
Yes
GPIO<3>
Pressed for
> 2 sec
No
Key De-bounce Delay 300 ms
B
Firmware Flowchart.
© 2006 Microchip Technology Inc.
Demo Board Firmware
NOTES:
© 2006 Microchip Technology Inc.
DS51612A-page 21
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DS51612A-page 22
06/08/06
© 2006 Microchip Technology Inc.