MPLAB Starter Kit for Digital Power User's Guide

Digital Power Starter Kit
User’s Guide
 2012 Microchip Technology Inc.
DS52078A
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and may be superseded by updates.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, 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
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro, PICSTART,
PIC32 logo, rfPIC and UNI/O are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MXDEV, MXLAB, SEEVAL 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, chipKIT,
chipKIT logo, CodeGuard, dsPICDEM, dsPICDEM.net,
dsPICworks, dsSPEAK, ECAN, ECONOMONITOR,
FanSense, HI-TIDE, In-Circuit Serial Programming, ICSP,
Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB,
MPLINK, mTouch, Omniscient Code Generation, PICC,
PICC-18, PICDEM, PICDEM.net, PICkit, PICtail, REAL ICE,
rfLAB, Select Mode, Total Endurance, TSHARC,
UniWinDriver, WiperLock and ZENA 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.
© 2012, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 978-1-62076-353-7
QUALITY MANAGEMENT SYSTEM
CERTIFIED BY DNV
== ISO/TS 16949 ==
DS52078A-page 2
Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, 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.
 2012 Microchip Technology Inc.
 2012 Microchip Technology Inc.
DS52078A-page 3
Digital Power Starter Kit User’s Guide
NOTES:
DS52078A-page 4
 2012 Microchip Technology Inc.
DIGITAL POWER STARTER KIT
USER’S GUIDE
Safety Notice
The following safety notices and operating instructions should be adhered to avoid a
safety hazard. If in any doubt, consult your supplier.
DANGER – The Digital Power Starter Kit contains two resistive loads that are intended
to dissipate power in the form of heat. Depending on the output power level, it is possible for the resistive load to become hot to the touch or to any surface in direct contact
with the board.
WARNING – The Digital Power Starter Kit should only be installed, operated, serviced
or modified by qualified personnel. Any service or modification performed by the user
is done at the user’s own risk and voids all warranties.
CAUTION – Particular care should be taken during code development as unexpected
voltage regulation behavior is possible. Ensure that the power supply connected to the
Digital Power Starter Kit is properly protected against overcurrent event caused by
code development.
General Notices:
• The Digital Power Starter Kit is intended for evaluation and development purposes
and should only be operated in a normal laboratory environment as defined by
IEC 61010-1:2001.
• Clean with a dry cloth only.
• Operate flat on a bench away from any surface items that might become in contact with the board. Do not move during operation and avoid direct contact with
the bottom layer of the board.
• The Digital Power Starter Kit should not be connected or operated if there is any
apparent damage to the unit.
 2012 Microchip Technology Inc.
DS52078A-page 5
Digital Power Starter Kit User’s Guide
NOTES:
DS52078A-page 6
 2012 Microchip Technology Inc.
DIGITAL POWER STARTER KIT
USER’S GUIDE
Table of Contents
Safety Notice ................................................................................................................. 5
Preface ........................................................................................................................... 9
Chapter 1. Introduction
1.1 Overview ...................................................................................................... 15
1.2 Kit Contents .................................................................................................. 15
1.3 Starter Kit Functionality and Features .......................................................... 16
1.4 Electrical Specifications ................................................................................ 18
Chapter 2. Hardware
2.1 Top Assembly ............................................................................................... 19
2.2 Signal Configuration ..................................................................................... 21
2.3 Application Components .............................................................................. 22
2.4 Board Connectors ........................................................................................ 23
2.5 Indicators and Human Interfaces ................................................................. 23
2.6 Test Points ................................................................................................... 24
2.7 Power Rating of Converter Stages ............................................................... 25
2.8 Programmer/Debugger ................................................................................. 26
Chapter 3. Demonstration Program Operation
3.1 Program Demonstration ............................................................................... 27
3.2 Code Demonstration .................................................................................... 29
3.3 Other Code Examples .................................................................................. 29
Appendix A. Board Layout and Schematics.............................................................. 31
Worldwide Sales and Service .................................................................................... 38
 2012 Microchip Technology Inc.
DS52078A-page 7
Digital Power Starter Kit User’s Guide
NOTES:
DS52078A-page 8
 2012 Microchip Technology Inc.
DIGITAL POWER STARTER KIT
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 preface contains general information that will be useful to know before using the
Digital Power Starter Kit. Topics discussed in this preface include:
•
•
•
•
•
•
•
•
Document Layout
Conventions Used in this Guide
Warranty Registration
Recommended Reading
The Microchip Web Site
Development Systems Customer Change Notification Service
Customer Support
Document Revision History
DOCUMENT LAYOUT
This user’s guide provides an overview of the Digital Power Starter Kit. The document
is organized as follows:
• Chapter 1. “Introduction” – This chapter introduces the Digital Power Starter Kit
and provides a brief overview of its features.
• Chapter 2. “Hardware” – This chapter describes the board layout and the main
components of the Digital Power Starter Kit.
• Chapter 3. “Demonstration Program Operation” – This chapter describes the
demonstration software that is preloaded on the device that accompanies the
Digital Power Starter Kit.
• Appendix A. “Board Layout and Schematics” – This appendix provides
diagrams of the hardware layout, as well as schematic diagrams for the Digital
Power Starter Kit.
 2012 Microchip Technology Inc.
DS52078A-page 9
Digital Power Starter Kit 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
N‘Rnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
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 number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
A key on the keyboard
Click OK
Click the Power tab
4‘b0010, 2‘hF1
Italic Courier New
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
Constants
A variable argument
Square brackets [ ]
Optional arguments
Curly braces and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
Represents code supplied by
user
File>Save
Press <Enter>, <F1>
#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}
var_name [,
var_name...]
void main (void)
{ ...
}
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.
DS52078A-page 10
 2012 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user’s guide describes how to use the Digital Power Starter Kit. The device-specific
data sheets contain current information on programming the specific microcontroller or
digital signal controller devices. The following Microchip documents are available and
recommended as supplemental reference resources:
MPLAB® C Compiler for PIC24 MCUs and dsPIC® DSCs User’s Guide
(DS51284)
This comprehensive guide describes the usage, operation and features of Microchip’s
MPLAB C compiler (formerly MPLAB C30) for use with 16-bit devices.
MPLAB® IDE User’s Guide (DS51519)
This user’s guide describes how to set up the MPLAB IDE software and use it to create
projects and program devices.
MPLAB X IDE User’s Guide (DS52027)
This document describes how to set up the MPLAB X IDE software and use it to create
projects and program devices.
Readme Files
For the latest information on using the Digital Power Starter Kit Board, read the
Readme.txt text file in the Readme subdirectory of the MPLAB IDE installation directory
from the Digital Power Starter Kit code example. The Readme file contains update
information and known issues that may not be included in this user’s guide.
dsPIC33FJ06GS001/101A/102A/202A and dsPIC33FJ09GS302 Data Sheet
(DS75018)
Refer to this document for detailed information on this family of dsPIC33F SMPS Digital
Signal Controllers (DSCs). Reference information found in this data sheet includes:
•
•
•
•
Device memory maps
Device pinout and packaging details
Device electrical specifications
List of peripherals included on the devices
dsPIC33F/PIC24H Family Reference Manual Sections
Family Reference Manual (FRM) sections are available, which explain the operation of
the dsPIC® DSC and PIC24H MCU family architecture and peripheral modules. The
specifics of each device family are discussed in the individual family’s device
data sheet.
dsPIC33F Flash Programming Specification for Devices with Volatile
Configuration Bits (DS70659)
Refer to this document for information on instruction sets and firmware development.
Microchip SMPS Resources
• AN1114 “Switch Mode Power Supply (SMPS) Topologies (Part I)” (DS01114)
• AN1207 “Switch Mode Power Supply (SMPS) Topologies (Part II)” (DS01207)
• TB062 “Frequently Asked Questions (FAQs) About dsPIC® DSC SMPS Devices”
(DS93062)
To obtain any of these documents, visit the Microchip web site at www.microchip.com.
 2012 Microchip Technology Inc.
DS52078A-page 11
Digital Power Starter Kit 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
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® C compiler; MPASM™ and MPLAB 16-bit
assemblers; MPLINK™ and MPLAB 16-bit object linkers; and MPLIB™ and
MPLAB 16-bit object librarians.
• Emulators – The latest information on the Microchip MPLAB REAL ICE™
in-circuit emulator.
• In-Circuit Debuggers – The latest information on the Microchip in-circuit
debugger, MPLAB ICD 3.
• MPLAB IDE – The latest information on Microchip MPLAB IDE, the Windows®
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 device programmer and the PICkit™ 3 development
programmers.
DS52078A-page 12
 2012 Microchip Technology Inc.
Preface
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
DOCUMENT REVISION HISTORY
Revision A (June 2012)
This is the initial released version of the document.
 2012 Microchip Technology Inc.
DS52078A-page 13
Digital Power Starter Kit User’s Guide
NOTES:
DS52078A-page 14
 2012 Microchip Technology Inc.
DIGITAL POWER STARTER KIT
USER’S GUIDE
Chapter 1. Introduction
This chapter introduces the Digital Power Starter Kit and provides an overview of its
features. The topics covered include:
• Kit Contents
• Starter Kit Functionality and Features
• Electrical Specifications
1.1
OVERVIEW
Modern power supplies are becoming smaller, more efficient, more flexible and less
expensive. These desirable enhancements have come about as Digital Signal Controllers (DSCs) are incorporated into Switch Mode Power Supply (SMPS) designs. The
board provided in the kit is intended to introduce and demonstrate the capabilities and
features of Microchip SMPS families of devices. The Digital Power Starter Kit features
an on-board programmer/debugger, which eliminates the need for any additional
programmer or hardware interface.
The software for the demonstration application that is preprogrammed into the onboard dsPIC33F Digital Signal Controller (DSC) is available for download from the
Microchip web site at: http://www.microchip.com.
Note:
1.2
Refer to the Readme file provided with the Digital Power Starter Kit demonstration software for instructions on how to run the demonstration application.
Refer to the Information Sheet that is provided with the starter kit package for
additional resources and instructions on how to use the starter kit for
programming and debugging application software.
KIT CONTENTS
The Digital Power Starter Kit contains the following:
• Digital Power Starter Kit Board
• 9V Power Supply
• USB Cable
Note:
 2012 Microchip Technology Inc.
If you are missing any part of the kit, contact a Microchip sales office for
assistance. A list of worldwide Microchip offices for sales and service is
provided at the end of this document.
DS52078A-page 15
Digital Power Starter Kit User’s Guide
1.3
STARTER KIT FUNCTIONALITY AND FEATURES
The Digital Power Starter Kit is a power supply board that consists of one independent
DC/DC synchronous Buck converter and one independent DC/DC Boost converter.
Figure 1-1 illustrates a high-level block diagram of the Starter Kit.
The Digital Power Starter Kit provides closed-loop Proportional-Integral-Derivative
(PID) control in the software to maintain the desired output voltage level. The dsPIC®
DSC device provides the necessary memory and peripherals for A/D conversion, PWM
generation, analog comparison and general purpose I/O, preventing the need to
perform these functions in external circuitry.
SMPS dsPIC DSC devices are specifically designed to provide low-cost and efficient
control for a wide range of power supply topologies. The specialized peripherals facilitate
closed-loop feedback control of switch mode power supplies, providing communication
for remote monitoring and supervisory control.
The dsPIC33F SMPS family of devices provide the following features:
• Integrated program and data memory on a single chip
• Ultra-fast interrupt response time with interrupt priority logic
• Up to 2 Msps, on-chip ADC with Successive Approximation Register (SAR), and
three Sample-and-Hold (S&H) circuits.
• Three independent, high-resolution PWM generators, specially designed to support
different power topologies
• Two high-speed analog comparators for control loop implementation and system
protection
• On-chip system communications (I2C™/SPI/UART)
• On-chip fast RC oscillator for lower system cost
• High-current sink/source for PWM pins (16 mA/16 mA)
• CPU performance (40 MIPS)
• Extensive power-saving features
FIGURE 1-1:
DIGITAL POWER STARTER KIT SYSTEM DIAGRAM
VIN
VIN
Current Sense
Buck
AN0
Vin_FB
AN4
VDD
5k
5k
AN5
AN6
RB8
SW1
Temperature
Sensor
USB
PC
On-Board
Debugger
DS52078A-page 16
AN7
dsPIC33FJ09GS302
PWM1H
Resistive
Load
VFB Buck
PWM1L
AN1
VFB Buck
PWM2H
VIN
Current Sense
Boost
AN2
AN3
Resistive
Load
VFB Boost
PWM4H
PWM2L
VFB Boost
LCD
Voltage/Current/
Temperature/Fault
 2012 Microchip Technology Inc.
Introduction
1.3.1
•
•
•
•
•
•
Power Stages
One synchronous Buck converter power stage
One Boost converter power stage
Voltage/current measurement and display for digital controlled Buck converter
Voltage/current measurement and display for digital controlled Boost converter
MOSFET controlled 5W resistive load on Buck Converter Output (BUCK_Out)
MOSFET controlled 5W resistive load on Boost Converter Output (BOOST_Out)
1.3.2
Additional Features
• 5 kOhm Potentiometers (P1 and P2), used to adjust the duty cycle of the
load resistors
• On-board temperature sensor, located near the resistive load; this enables the user
to program a temperature protection limit
• Input voltage sense, used to detect under/overvoltage conditions
• Connector for PICkit Serial Analyzer (J3)
• LED power-on indicator (D1)
• LED output voltage indicators (D5 and D12)
• LCD used to display voltage, current, temperature and Fault conditions
1.3.3
Starter Kit Power
• +9V power connector (J2) supplies power to the Digital Power Starter Kit
• USB connection jack (J5) supplies power/connection to the on-board debugger
• Buck and Boost converters are both operated in Voltage mode (default), but can
also be reprogrammed to operate in Average Current or Peak Current Control mode
 2012 Microchip Technology Inc.
DS52078A-page 17
Digital Power Starter Kit User’s Guide
1.4
ELECTRICAL SPECIFICATIONS
TABLE 1-1:
DC INPUT RATING (J2)
Parameter
Minimum
Typical
Maximum
Unit
Voltage
7.0
9
11
V
Current
1
—
—
A
Maximum
Unit
TABLE 1-2:
BUCK CONVERTER ELECTRICAL SPECIFICATIONS
Parameter
Minimum
Typical
Output Voltage (default programmed)
—
3.3
—
V
Output Voltage (programmable range)
1.2
—
4.5
V
Output Voltage Ripple
—
50
—
mV (pk-pk)
Output Current
—
—
1.5
A
Load Regulation:
VOUT = 3.3V, IOUT = 0.02-1.5A, VIN = 9V
—
50
—
mV/A
Switching Frequency
—
350
—
kHz
Output Power
—
—
5
W
TABLE 1-3:
BOOST CONVERTER ELECTRICAL SPECIFICATIONS
Parameter
Minimum
Typical
Maximum
Unit
Output Voltage (default programmed)
—
15
—
V
Output Voltage (programmable range)
11
—
18
V
Output Voltage Ripple
—
100
—
mV (pk-pk)
Output Current
—
—
0.4
A
Load Regulation:
VOUT = 15V, IOUT = 0.02-0.3A, VIN = 9V
—
50
—
mV/A
Switching Frequency
—
350
—
kHz
Output Power
—
—
5
W
DS52078A-page 18
 2012 Microchip Technology Inc.
DIGITAL POWER STARTER KIT
USER’S GUIDE
Chapter 2. Hardware
This chapter describes the hardware components of the Digital Power Starter Kit.
Topics covered include:
•
•
•
•
•
•
•
•
2.1
Top Assembly
Signal Configuration
Application Components
Board Connectors
Indicators and Human Interfaces
Test Points
Power Rating of Converter Stages
Programmer/Debugger
TOP ASSEMBLY
The top and bottom assembly of the board is shown in Figure 2-1 and Figure 2-2.
Table 2-1 and Table 2-2 provide a description of the components.
FIGURE 2-1:
DIGITAL POWER STARTER KIT (TOP VIEW)
5
3
1
6
7
 2012 Microchip Technology Inc.
8
2
4
DS52078A-page 19
Digital Power Starter Kit User’s Guide
TABLE 2-1:
DIGITAL POWER STARTER KIT COMPONENTS (TOP)
Number
Description
1
dsPIC33FJ09GS302 Digital Signal Controller (DSC) (U3)
2
9V Power Connector (J2)
3
2x16 Character LCD
4
Boost Converter Stage
5
Buck Converter Stage
6
Push Button (SW1)
7
Potentiometers (P1 and P2)
8
Voltage Regulator (3.3V)
FIGURE 2-2:
DIGITAL POWER STARTER KIT (BOTTOM VIEW)
4
2
6
3
5
1
TABLE 2-2:
DIGITAL POWER STARTER KIT COMPONENTS (BOTTOM)
Number
DS52078A-page 20
Description
1
Voltage Regulator (5V)
2
On-Board Programmer/Debugger
3
Programmer/Debugger USB Connector (J5)
4
Buck Converter Resistive Load
5
Boost Converter Resistive Load
6
On-Board Temperature Sensor
 2012 Microchip Technology Inc.
Hardware
2.2
SIGNAL CONFIGURATION
Table 2-3 provides a full list of the dsPIC33FJ09GS302 DSC connections and a brief
functional description of the pins used in the Digital Power Starter Kit.
TABLE 2-3:
dsPIC33FJ09GS302 CONFIGURATION DETAILS
dsPIC33FJ09GS302
Digital Power Starter Kit
Signal Label
Description/Function
Pin
#
Device Pin Name
ICSP_MCLR_VPP_Target
1
MCLR
Master Clear (Reset) Input
CS_BUCK
2
AN0/CMP1A/RA0
Analog – Buck Current Sense
VFB_BUCK
3
AN1/CMP1B/RA1
Analog – Buck Voltage Feedback
CS_BOOST
4
AN2/CMP1C/CMP2A/RA2
Analog – Boost Current Sense
VFB_BOOST
5
AN3/CMP1D/CMP2B/RP0/CN0/RB0
Analog – Boost Voltage Feedback
VIN_FB
6
AN4/ISRC4/CMP2C/RP9/CN9/RB9
Analog – Input Voltage Feedback
EXT POT2
7
AN5/ISRC3/CMP2D/RP10/CN10/RB10
Analog – 5k Potentiometer
—
8
VSS
Ground
EXT POT1
9
OSC1/CLKI/AN6/ISRC2/RP1/CN1/RB1
Analog – 5k Potentiometer
Temp_Sensor
10
OSC2/CLKO/AN7/ISRC1//RP2/CN2/RB2 Analog – Temperature Sensor
PGD2
11
PGED2/DACOUT/INT0/RP3/CN3/RB3
Data I/O pin for programming/
debugging Communication Channel 2
PGC2
12
PGEC2/EXTREF/RP4/CN4/RB4
Clock Input pin for programming/
debugging Communication Channel 2
13
VDD
Positive Supply for peripheral logic and
I/O pins
SW
14
PGED3/RP8/CN8/RB8
SW1 Push Button
LCD_Reset
15
PGEC3/RP15/CN15/RB15
LCD Active-Low Reset Signal
LCD_RSelect
16
TDO/RP5/CN5/RB5
LCD Register Select Signal
SCL/TX
17
PGED1/TDI/SCL1/RP6/CN6/RB6
LCD Serial Clock
18
PGEC1/SDA1/RP7/CN7/RB7
LCD_Data
—
19
VSS
Ground
—
20
VCAP
CPU Logic Filter Capacitor Connection
21
TMS/RP11/CN11/RB11
Boost MOSFET PWM Signal
—
SDA/RX
PWM4H
LCD_CSB
22
TCK/RP12/CN12/RB12
LCD Active-Low Chip Select Signal
Load BUCK
23
PWM2H/RP13/CN13/RB13
Buck-Resistive Load Driver PWM Signal
Load BOOST
24
PWM2L/RP14/CN14/RB14
Boost-Resistive Load Driver PWM
Signal
PWM1H
25
PWM1H/RA4
Buck High Side MOSFET PWM Signal
PWM1L
26
PWM1L/RA3
Buck Low Side MOSFET PWM Signal
—
27
AVSS
Ground Reference for analog modules
—
28
AVDD
Positive Supply for analog modules; this
pin must be connected at all times
 2012 Microchip Technology Inc.
DS52078A-page 21
Digital Power Starter Kit User’s Guide
2.3
APPLICATION COMPONENTS
Table 2-4 describes the application components that are available on the Digital Power
Starter Kit (see Figure 2-1 and Figure 2-2 for component locations).
TABLE 2-4:
APPLICATION COMPONENTS
Component
Label
Item
Description
Top Assembly Components (see Figure 2-1)
dsPIC33FJ09GS302 DSC
U3
1
Provides the processing power for the demonstration applications and application development on the starter kit. The MCU
features 9 Kbytes of Flash program memory and 1 Kbyte of
RAM. The demonstration application uses the MCU device’s
on-chip FRC oscillator with PLL as a clock source.
9V Power Connector
J2
2
A 9V power supply powers the dsPIC33FJ09GS302 DSC and
supplies the power to both of the DC/DC converters on the
starter kit. To operate the starter kit, connect the power supply
provided with the starter kit to J2.
2x16 Character LCD
LCD1
3
User-programmable 2x16 character LCD.
N/A
4
5W step-up converter (Boost).
Boost Converter Stage
Buck Converter Stage
Potentiometer
Voltage Regulator
N/A
5
5W step-down converter (Buck).
P1 & P2
7
Two Potentiometers (POTs). Each POT is connected to an analog
input pin of the DSC, providing an analog reference voltage from
3.3V to ground (0V).
U2
8
Voltage regulator (3.3V) provides power to the
dsPIC33FJ09GS302 DSC, LCD, push button, potentiometers
and temperature sensor.
Bottom Assembly Components (see Figure 2-2)
Voltage Regulator
U1
1
Voltage regulator (5V) provides power to the 3.3V regulator and
to the Buck stage gate driver (U9).
On-Board Programmer/
Debugger
N/A
2
Controls the programming/debugging operations of the target
dsPIC33FJ09GS302 DSC.
Programmer/Debugger
USB Connector
J5
3
Provides power to the programmer/debugger and bidirectional
communication between the host PC and starter kit.
Buck Resistive Load
N/A
4
MOSFET controlled 2.2 Ohm resistive load (5W max).
Boost Resistive Load
N/A
5
MOSFET controlled 48.3 Ohm resistive load (5W max).
On-Board Temperature
Sensor
U7
6
The temperature sensor is strategically placed near the load
resistors. It is intended to provide the board temperature to the
DSC and to disable both of the resistive loads if the temperature
exceeds the set limit.
DS52078A-page 22
 2012 Microchip Technology Inc.
Hardware
2.4
BOARD CONNECTORS
Table 2-5 describes the hardware connections available on the Digital Power Starter Kit
(see Figure 2-1 and Figure 2-2 for component locations).
TABLE 2-5:
Label
J1
2.5
HARDWARE CONNECTIONS
Hardware Element Description
Connector for PICkit™ Serial Analyzer (not populated).
J2
9V power supply (not populated).
J3
ICSP™ programmer interface connector for programming the
dsPIC33FJ09GS302 DSC.
J4
ICSP programmer interface connector for programming the
PIC24FJ256GB106 MCU USB-to-UART bridge (not populated).
J5
Mini-USB connector provides bidirectional communication between the host
PC and the on-board programmer/debugger.
INDICATORS AND HUMAN INTERFACES
Table 2-6 describes the user interfaces available on the starter kit.
TABLE 2-6:
INDICATORS AND HUMAN INTERFACES
Label
Hardware Element Description
SW1
Push button switch, which is connected to the RB8 port pin. When momentarily
pressed, the LCD measurement and board status information is changed.
D1
Power-on status LED, which indicates that the Digital Power Starter Kit is
powered by the 9V supply.
D14
USB bus indicator, which indicates that the device is connected to the USB bus
and the programmer/debugger is powered.
P1 and P2
Two variable resistors (potentiometers). Each potentiometer is connected to an
analog input pin, providing an analog reference voltage from 3.3V to ground
(0V).
D12
Buck converter power-on status LED, which indicates when the Buck DC/DC
converter is enabled.
D5
Boost converter power-on status LED, which indicates when the Boost DC/DC
converter is enabled. Because of the Boost configuration, this LED will be
illuminated when +9V is present at the J2 connector.
LCD1
 2012 Microchip Technology Inc.
User-programmable 2x16 character LCD display.
DS52078A-page 23
Digital Power Starter Kit User’s Guide
2.6
TEST POINTS
Table 2-7 describes the test points that are available on the Digital Power Starter Kit.
See Figure 2-3 for test point locations.
TABLE 2-7:
TEST POINTS
Test Point
Description
+9V
9V Power Supply test point
BUCK_OUT
Output Voltage for the Buck Stage test point
BOOST_OUT
Output Voltage for the Boost Stage test point
TP1
3.3V Supply Voltage test point
TP5
Boost Stage Switch Node test point
TP6
Boost Stage BODE test point
TP9
Buck Stage BODE test point
TP10
Buck Stage Current Sense test point
TP11
Buck Stage High-Side MOSFET Gate Signal test point
TP12
Buck Stage Low-Side MOSFET Gate Signal test point
TP13
Boost Stage MOSFET Gate Signal test point
TP14
Buck Stage Output Voltage Feedback test point
TP15
Boost Stage Output Voltage Feedback test point
TP16
Resistive Load MOSFET Gate Signal (Boost) test point
TP17
Resistive Load MOSFET Gate Signal (Buck) test point
TP22
Buck Stage Switch Node test point
FIGURE 2-3:
DIGITAL POWER STARTER KIT TEST POINT LOCATIONS
TP11
TP22
TP12
BUCK_OUT
GND
TP14
TP17
TP10
TP6
TP9
GND
TP15
TP11
BOOST_OUT
GND
TP1
DS52078A-page 24
+9V
TP13
TP12
GND
 2012 Microchip Technology Inc.
Hardware
2.7
POWER RATING OF CONVERTER STAGES
The Digital Power Starter Kit is designed to be a self-contained power supply board with
variable 5W loads connected to each DC/DC converter.
2.7.1
BUCK CONVERTER
The Buck converter stage is rated for a maximum power output of 5W to the dedicated
on-board resistive load. The output voltage and output current should remain within its
Safe Operating Area (SOA) to avoid damage to the board, as shown in the graph in
Figure 2-4. The output voltage of the Buck converter (BUCK_Out) can be programmed
to be from a 1.2V to 4.5V output, with a default programmed voltage of 3.3V. The hardware gain [5k/(3.3k + 5k)] of the voltage feedback from the BUCK_Out is provided by
the resistor divider network, R97 and R105. Additionally, a 20 Ohm resistor, R90, for
bode plot measurements is also in series with the feedback network. The hardware
gain of the current feedback is provided by the current transformer (T1) with turns ratio
(1:60) and burden resistor, R69.
FIGURE 2-4:
 2012 Microchip Technology Inc.
BUCK CONVERTER SOA CURVE
DS52078A-page 25
Digital Power Starter Kit User’s Guide
2.7.2
Boost Converter
The Boost converter stage is rated for a maximum output power of 5W to the dedicated
on-board resistive load. The output voltage and output current should remain within the
Boost converter Safe Operating Area (SOA) to avoid damage to the board, as shown
in the graph in Figure 2-5. The output voltage of the Boost converter (BOOST_Out) can
be programmed to be from an 11V to 18V output, with a default programmed voltage
of 15V. The hardware gain [20k/(20k + 3.3k)] of the voltage feedback from the
BOOST_Out is provided by the resistor divider network of R41 and R51. Additionally,
a 20 Ohm resistor, R30, for bode plot measurements is also in series with the feedback
network. The hardware gain of the current feedback is provided by the current sense
resistor, R61.
FIGURE 2-5:
BOOST CONVERTER SOA CURVE
0.45
0.40
Output Current, A
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
11
2.8
12
13
14
15
16
Output Voltage, V
17
18
19
PROGRAMMER/DEBUGGER
The Digital Power Starter Kit includes an on-board programmer/debugger circuit that
provides connectivity over USB. This circuit is hard-wired to the dsPIC DSC device to
provide ICSP™ debugging/programming capability.
2.8.1
Programmer/Debugger Components
Table 2-8 describes the programmer/debugger components that are available on the
Digital Power Starter Kit (see Figure 2-2 for component locations).
TABLE 2-8:
PROGRAMMER/DEBUGGER COMPONENTS
Component
Label
Item #
On-Board Programmer/
Debugger
N/A
2
Controls the programming/debugging operations of the target
dsPIC33FJ09GS302 DSC.
Programmer/Debugger
USB Connector
J5
3
Provides power to the programmer/debugger, and bidirectional
communication between the host PC and the Digital Power
Starter Kit.
DS52078A-page 26
Description
 2012 Microchip Technology Inc.
DIGITAL POWER STARTER KIT
USER’S GUIDE
Chapter 3. Demonstration Program Operation
The dsPIC33FJ09GS302 Digital Power Starter Kit is preprogrammed with a
demonstration application that illustrates simultaneous Proportional-Integral-Derivative
(PID) control of the output voltage for the two DC/DC converter circuits on board the
Digital Power Starter Kit. This code can be downloaded from the Microchip web site
(www.microchip.com).
This section covers the following topics:
• Program Demonstration
• Code Demonstration
• Other Code Examples
3.1
PROGRAM DEMONSTRATION
The demonstration program provides simultaneous closed-loop control of the output
voltage for both DC/DC converter stages of the Digital Power Starter Kit.
One PID loop controls the Buck converter output voltage (BUCK_Out) at 3.3V. The
other PID loop controls the Boost converter output voltage (BOOST_Out) at 15V.
The PID control scheme consists of the following parameters:
• Proportional Error Gain (P-Gain) – This parameter produces a correction factor
that is proportional to the magnitude of the output voltage error.
• Integral Error Gain (I-Gain) – This parameter uses the cumulative voltage error to
generate a correction factor that eliminates any residual error due to limitations in
offset voltages and measurement resolution.
• Derivative Error Gain (D-Gain) – This parameter produces a correction factor that
is proportional to the rate of change of the output error voltage, which helps the
system respond quickly to changes in system conditions.
The demonstration program requires no manual preparation except to connect 9V
power to the J2 connector.
 2012 Microchip Technology Inc.
DS52078A-page 27
Digital Power Starter Kit User’s Guide
FIGURE 3-1:
SMPS DEMONSTRATION PROGRAM FLOW CHART
Start
Initialization Routines:
• Peripherals – ADC, PWM, Timers, GPIO,
LCD, etc.
• Variables – PID Gain Terms, Data Buffers
• Interrupts – ADC, Timers
• Set Soft Start Flag
Fault Check Routine
Does Fault
Condition Exist?
Yes
Disable
Outputs
ADC Interrupt
No
Soft Start Routine
ADC Interrupt Routines:
Soft Start
Routine
Yes
Is Soft
Start Active?
• Measure VOUT
• Calculate PID Gain Parameters
• Update PWM Duty Cycle
No
End
Idle Loop Functions:
•
•
•
•
•
•
DS52078A-page 28
Check VIN
Check Soft Start Flag
Check/Reset Fault Timers and Flag
Measure Temperature and Potentiometer’s Position
Update LCD Display Information
Perform Non-Critical Functions (i.e., user application
tasks)
 2012 Microchip Technology Inc.
Demonstration Program Operation
3.2
CODE DEMONSTRATION
3.2.1
System Initialization
When power is applied to the board, the program starts by executing the following
system initialization routines:
• Peripherals – The required peripherals (PWM, ADC, Timers and GPIO) are
configured and enabled
• Variables – Program variables are defined. RAM locations and register usage are
defined and documented
• Constants – Program constants are defined, including reference set points for
both Buck output voltage and Boost output voltage, input voltage, current limits,
Fault conditions, PWM periods and Timer periods
• Interrupts – The ADC and Timer interrupts are set up and enabled
3.2.2
Fault Check
The program checks for input under/overvoltage, output overvoltage and board temperature limit. If a Fault occurs, the PWM outputs are disabled until the Fault condition
is cleared. If no Fault is detected, the program proceeds.
3.2.3
Soft Start
The Soft Start routine ramps up the output voltage in a close-loop fashion to bring the
system within the operating range of the PID control loop. This routine ensures that the
output does not overshoot the desired voltage; it also limits the current at start-up.
3.2.4
ADC Interrupt
The ADC interrupt is the heart of the demo program. This routine takes up approximately 75% of the execution time. It performs all the PID calculations and applies any
needed corrections to the output.
Note:
3.2.5
The ADC interrupt can occur any time during program execution. The ADC
interrupt takes priority over any other tasks that the program is performing.
System Idle Loop
All auxiliary functions are performed in the system Idle routine. This is the time available
to the CPU while the demo program is waiting for an ADC interrupt. Non-critical
functions can be performed in this loop. During this time the LCD is refreshed, the
potentiometers position, input voltage, Fault timers and Soft Start flag are checked.
3.3
OTHER CODE EXAMPLES
There are several other SMPS code examples available on the Microchip web site.
Refer to the Readme files located in each code example folder for details on what
each code example demonstrates. Check the Microchip web site
(www.microchip.com/SMPS) for the latest updates to the code examples and for
additional code examples.
 2012 Microchip Technology Inc.
DS52078A-page 29
Digital Power Starter Kit User’s Guide
NOTES:
DS52078A-page 30
 2012 Microchip Technology Inc.
DIGITAL POWER STARTER KIT
USER’S GUIDE
Appendix A. Board Layout and Schematics
FIGURE A-1:
DIGITAL POWER STARTER KIT LAYOUT (TOP)
 2012 Microchip Technology Inc.
DS52078A-page 31
Digital Power Starter Kit User’s Guide
FIGURE A-2:
DS52078A-page 32
DIGITAL POWER STARTER KIT LAYOUT (BOTTOM)
 2012 Microchip Technology Inc.
J2
2
3
1
GND
 2012 Microchip Technology Inc.
GND
GND
+3.3V
3
R22 DNP
DNP
B AT54S LT1G
D16
R19
1
2
3
VOUT
2
D15
1
GND
B AT54SLT1G
+3.3V
MCP1703T-5002
GND
TAB (G ND)
VIN
U1
R20
GND
C11
0.1 PF
+3.3V
Temp_Sens
EXT_POT1
R16
V FB _BO OST
SW
PGC2
PGD2
0R
0R
GND
+5V
C2
10 PF
EX T_POT2
V in_FB
CS _BO OST
V FB _BUCK
CS _BUCK
R12
10K
+3.3V
3
ICSP_MCLR_VPP_TAR GET
GND
2
4
1
GND
GND
2
4
1
VOUT
3
14
13
12
11
10
9
8
7
6
5
4
3
2
1
+3.3V
C4
10 PF
U3
6
5
4
3
2
1
AN5/I SRC3/CMP2D/RP10(1)/CN10/RB10
AN4/I SRC4/CMP2C/R P9(1)/CN9/RB9
AN3/CMP1D/CM P2B/RP0(1)/CN0/RB0
PGED 3/RP8(1)/CN 8/R B8
VDD
PGEC2/ EX TREF /R P4(1)/CN4/RB 4
PGED 2/DACOUT/INT0/RP3(1)/CN 3/R B3
OSC2/CL K O/AN7/ISR C1/RP 2(1)/CN 2/R B2
OSC1/CL K I/AN6/ISRC2/ R P1(1)/CN1/R B1
VSS
J3
DN P
GND
R2
330R
D1
Green
+3.3V
PWM1H/R A4
PWM1L /RA 3
AVSS
AVDD
TP4
TP1
PG EC3/R P15/CN15/R B15
TDO /RP5(1)/CN 5/R B5
PGED1/TDI/SCL1/RP6(1)/CN 6/RB6
PGEC1/ SDA1/R P7(1)/CN7/RB7
VSS
VCAP
TMS/RP11(1)/CN 11/R B11
TCK /RP12(1)/CN12/RB12
PWM2H/R P13(1)/CN13/R B13
PWM2L /RP14(1)/CN14/RB14
dsPIC33FJ09GS302
GND
GND
C3
0.1 PF
AN2/CMP1C/CMP2A/RA2
AN1/CMP1B 1/R A1
AN0/CMP1A/RA0
MCL R
PGC2
PGD2
ICSP_MCLR_VPP_TAR GET
MCP1703-3302E/DB
GND
TAB (G ND)
VIN
U2
15
16
17
18
19
20
21
22
23
24
25
26
27
28
SW1
PWM4H
L CD _CS B
L oad_B UCK
Load_B OOST
PWM1H
PWM1L
GND
2
1
GND
P2
5K
+3.3V
GND
P1
5K
+3.3V
4
3
L CD _Reset
GND
R25
DNP
R9
0R
DNP
R24
C7
0.1 PF
+3.3V
C4
10 PF
GND
0R
R17
L3
GND
C6
0.1 PF
R8
10K
+3.3V
EXT_POT2
EXT_POT1
L CD _RS Elect
SCL /TX
SDA/RX
AGND
C8
0.1 PF
AVDD
C5
0.01 PF
C1
0.01 PF
I2CAUX2
I2CAUX 1
SW
F ID2
F ID3
F ID4
SCL /TX
SDA/RX
GND
C9
1 PF
R6
DNP
+3.3V
L CD _Reset
R2 3
60.4R
0.25W
+3.3V
SDA/RX
SCL /TX
GND
L CD _CSB
LCD _ RSelect
R7
DNP
GND
+3.3V
R11 0R
C10
1 PF
GND
C13
0.1 PF
C12
1 PF
R21 0R
R18 0R
R15 0R
R14 0R
R13 0R
K
A
10
9
8
7
6
5
4
3
2
1
SCL
CSB
L ED -
L ED +
C1+
C1+
VOUT
VDD
VSS
SI
1
DNP
1
2
DNP
PICkit™ 2
+3.3V
VDD
GND
J1
GND
B AT54SLT1G
RST
RS
DNP
B AT54SLT1G
LC D1
3
D3
3
D2
2
1
2
3
4
5
6
NH D-C0 216CZ -F S W -F B W -3V3
I2CAUX 2
R3 DNP
R5 DNP
I2CAUX1
FIGURE A-3:
GND
R4
2.21K
GND
C57
10 PF
TP 19
+9V
VIN_FB
R1
10K
+9V
Board Layout and Schematics
DIGITAL POWER STARTER KIT SCHEMATIC
DS52078A-page 33
PWM4H
R58
3.30K
GND
4
3
2
1
OUT B
VDD
OUT A
NC
GND
TC4427ACOA
IN B
GND
IN A
NC
U4
GND
C16
22 PF
5
6
7
8
C15
0.1 PF
GND
C22
4.7 PF
C23
0.1 PF
+9V
5.1
1/8W
R52
4
TP13
10K
R57
D4
GND
R61
0.5R
0.5W
Q2
MCP87050
TP5
5
1
2
3
L1
150 PH
R51
3.30K
1K
R63
1K
R64
1K
C19
470 pF
1K
C24
18 pF
GND
4
3
TP2
IN-
IN+
V FB _BO OST
Place close to dsPIC® DSC
R41
20.0K TP15
R60
C18
1 PF
TP6
R59
C17
220 PF
R30
20R
B OOS T_ Out
AVDD
10K
AGND
10K
R65
C20
DNP
R28
R27
60.4R
R32
R26
60.4R
R31
R56
0R
R53
DNP
0R
GND
R143
3.30K
GND
C25
18 pF
60.4R
60.4R
60.4R
AGND
60.4R
60.4R
R49
60.4R
R48
60.4R
R47
AVDD
60.4R
R50
60.4R
R45
60.4R
R44
60.4R
R43
L oad_B UCK
L oad_B OOST
CS _BOOST
60.4R
R46
60.4R
R38
60.4R
R37
60.4R
R39
60.4R
R34
R29
0.25W
0.25W
0.25W
0.25W
0.25W
60.4R
R36
60.4R
R33
0.25W
0.25W
0.25W
0.25W
0.25W
0.25W
0.25W
0.25W
0.25W
0.25W
U5
AGND
MCP6021T-E/OT
R62
1
C21
DNP
D5
Green
R35
10K
R54
5
VDD
+9V
VSS
DS52078A-page 34
2
R66
3.30K
GND
R67
3.30K
8
7
6
5
4
3
2
1
OUT B
VDD
OUT A
NC
R40
10K
TC4427ACOA
IN B
GND
IN A
NC
U6
GND
4
5
6
7
8
GND
C26
0.1 PF
+9V
R42
11R
TP16
OUT B
Q1
NTM S5838NLR2G
FIGURE A-4:
3
2
1
0.25W
0.25W
0.25W
0.25W
0.25W
Digital Power Starter Kit User’s Guide
DIGITAL POWER STARTER KIT SCHEMATIC (BOOST CONVERTER)
 2012 Microchip Technology Inc.
PWM1L
PWM1H
GND
C33
4.7 PF
GND
R106
3.30K
C34
0.1 PF
+5V
R107
3.30K
3
2
6
DNP
D9
CS _BUCK
PWM_LO
PWM_HI
VCC
0.1 PF
C32
5
1
1K
R68
GND
MCP14700-E/SN
L OWDR
PHASE
8
C28
DNP
GND
HIGHDR
U9
R142
DNP
7
B OOT
GND
4
2
R79
1
R96
5.1R 1/8W
4
6
T1
7
8
10K
R104
4
TP12
R74
10K
4
TP11
TRANS _CST2 _060L
R70
DNP
B AT54S LT1G
5.1R 1/8W
D7
R69
120R
3
5
6
GND
MCP87050
Q5
C31
220 PF
C39
DNP
R91
DNP
TP22
GND
+9V
MCP87050
Q3
1
2
3
5
6
1
2
3
L2
22 PH
C35
6.3V
150 PF
GND
C37
6.3V
150 PF
C38
22 PF
TP14
R90
20R
GND
R105
4.99K
R97
3.30K
C36
1 PF
TP3
C40
18 pF
V FB _BUCK
TP9
B UCK _Out
C29
0.1 PF
2
4
2.74R
0.25W
0.25W
0.25W
0.25W
0.25W
2.74R
R100
2.74R
R93
2.74R
R92
2.74R
R99
2.74R
R86
2.74R
R85
3
2.74R
R80
R76
VOUT
2.74R
R81
R75
MCP9700
GND
VDD
U7
2.74R
0.25W
0.25W
D12
Green 0.25W
0.25W
0.25W
R103
2.21K
GND
GND
+3.3V
R72
GND
2.74R
0.25W
0.25W
0.25W
0.25W
0.25W
2.74R
R101
2.74R
R94
2.74R
R87
2.74R
R82
R77
C30
0.1 PF
120R
2.74R
0.25W
0.25W
0.25W
0.25W
0.25W
2.74R
R102
2.74R
R95
2.74R
R88
2.74R
R83
R78
Temp_Sens
8
7
6
5
 2012 Microchip Technology Inc.
GND
3
2
1
Q4
4
R98
10K
TP17
R71
11R
OUT B
FIGURE A-5:
NT MS 5838NL R 2G
TP10
Board Layout and Schematics
DIGITAL POWER STARTER KIT SCHEMATIC (BUCK CONVERTER)
DS52078A-page 35
Digital Power Starter Kit User’s Guide
NOTES:
DS52078A-page 36
 2012 Microchip Technology Inc.
NOTES:
 2012 Microchip Technology Inc.
DS52078A-page 37
Worldwide Sales and Service
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DS52078A-page 38
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11/29/11
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