Digital Power Starter Kit
User’s Guide
2015 Microchip Technology Inc.
DS50002330B
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and may be superseded by updates.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,
FlashFlex, flexPWR, JukeBlox, KEELOQ, KEELOQ logo, Kleer,
LANCheck, MediaLB, MOST, MOST logo, MPLAB,
OptoLyzer, PIC, PICSTART, PIC32 logo, RightTouch, SpyNIC,
SST, SST Logo, SuperFlash and UNI/O are registered
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
The Embedded Control Solutions Company and mTouch are
registered trademarks of Microchip Technology Incorporated
in the U.S.A.
Analog-for-the-Digital Age, BodyCom, chipKIT, chipKIT logo,
CodeGuard, dsPICDEM, dsPICDEM.net, ECAN, In-Circuit
Serial Programming, ICSP, Inter-Chip Connectivity, KleerNet,
KleerNet logo, MiWi, MPASM, MPF, MPLAB Certified logo,
MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code
Generation, PICDEM, PICDEM.net, PICkit, PICtail,
RightTouch logo, REAL ICE, SQI, Serial Quad I/O, Total
Endurance, TSHARC, USBCheck, VariSense, ViewSpan,
WiperLock, Wireless DNA, 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.
Silicon Storage Technology is a registered trademark of
Microchip Technology Inc. in other countries.
GestIC is a registered trademarks of Microchip Technology
Germany II GmbH & Co. KG, a subsidiary of Microchip
Technology Inc., in other countries.
All other trademarks mentioned herein are property of their
respective companies.
© 2015, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
ISBN: 978-1-63277-380-7
QUALITY MANAGEMENT SYSTEM
CERTIFIED BY DNV
== ISO/TS 16949 ==
DS50002330B-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.
2015 Microchip Technology Inc.
Object of Declaration: Digital Power Starter Kit
2015 Microchip Technology Inc.
DS50002330B-page 3
Digital Power Starter Kit User’s Guide
NOTES:
DS50002330B-page 4
2015 Microchip Technology Inc.
DIGITAL POWER STARTER KIT
USER’S GUIDE
Safety Notice
The following safety notices and operating instructions should be adhered to in order 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 come 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.
2015 Microchip Technology Inc.
DS50002330B-page 5
Digital Power Starter Kit User’s Guide
NOTES:
DS50002330B-page 6
2015 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 ................................................................................ 19
Chapter 2. Hardware
2.1 Top Assembly ............................................................................................... 21
2.2 Signal Configuration ..................................................................................... 23
2.3 Application Components .............................................................................. 24
2.4 Board Connectors ........................................................................................ 25
2.5 Indicators and Human Interfaces ................................................................. 25
2.6 Test Points ................................................................................................... 26
2.7 Power Rating of Converter Stages ............................................................... 28
2.8 Programmer/Debugger ................................................................................. 29
Chapter 3. Demonstration Program Operation
3.1 Program Demonstration ............................................................................... 31
3.2 Code Demonstration .................................................................................... 33
3.3 Other Code Examples .................................................................................. 34
Appendix A. Board Layout and Schematics.............................................................. 35
Worldwide Sales and Service .................................................................................... 40
2015 Microchip Technology Inc.
DS50002330B-page 7
Digital Power Starter Kit User’s Guide
NOTES:
DS50002330B-page 8
2015 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
“DSXXXXXXXXA”, where “XXXXXXXX” 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.
2015 Microchip Technology Inc.
DS50002330B-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 ,
#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.
DS50002330B-page 10
2015 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® X IDE User’s Guide (DS50002027)
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 X IDE installation directory from the Digital Power Starter Kit code example. The Readme file contains updated
information and known issues that may not be included in this user’s guide.
dsPIC33 ‘GS’ Data Sheet
Refer to these documents for detailed information on the dsPIC33 ‘GS’ SMPS Digital
Signal Controllers (DSCs). Reference information found in these data sheets includes:
•
•
•
•
Device memory maps
Device pinout and packaging details
Device electrical specifications
List of peripherals included on the devices
dsPIC33/PIC24 Family Reference Manual Sections
Family Reference Manual (FRM) sections are available, which explain the operation of
the dsPIC® DSC and PIC® MCU family architecture and peripheral modules. The
specifics of each device family are discussed in the individual family’s device
data sheet.
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.
2015 Microchip Technology Inc.
DS50002330B-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® XC 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 X IDE – The latest information on Microchip MPLAB X IDE, the
Windows® Integrated Development Environment for development systems tools.
This list is focused on the MPLAB X IDE, MPLAB SIM simulator, MPLAB X 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
programmer.
DS50002330B-page 12
2015 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 (January 2015)
This is the initial released version of this document.
Revision B (May 2015)
Updated schematic in Figure A-3 that resides in Appendix A. “Board Layout and
Schematics”.
2015 Microchip Technology Inc.
DS50002330B-page 13
Digital Power Starter Kit User’s Guide
NOTES:
DS50002330B-page 14
2015 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:
•
•
•
•
1.1
Overview
Kit Contents
Starter Kit Functionality and Features
Electrical Specifications
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
on-board dsPIC33 ‘GS’ 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:
2015 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.
DS50002330B-page 15
Digital Power Starter Kit User’s Guide
1.3
STARTER KIT FUNCTIONALITY AND FEATURES
The Digital Power Starter Kit is a Switch Mode Power Supply (SMPS) 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 Digital Power
Starter Kit.
The Digital Power Starter Kit provides closed-loop Peak Current Mode control using a
2-Pole, 2-Zero (2P2Z) compensator implemented in software to maintain the desired
output voltage level of Peak Current Mode (PkCM) control. The dsPIC® DSC device
provides the necessary memory and peripherals for ADC 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 dsPIC33 ‘GS’ family of devices provides the following features:
•
•
•
•
Integrated program and data memory on a single chip
Ultra-fast interrupt response time with interrupt priority logic
High-Speed ADC with multiple Sample-and-Hold (S&H) circuits.
High-resolution PWM generators, specially designed to support different power
topologies
• 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
DS50002330B-page 16
2015 Microchip Technology Inc.
Introduction
FIGURE 1-1:
DIGITAL POWER STARTER KIT SYSTEM DIAGRAM
VIN
VIN_FB
AN0
AN4
VIN
Current Sense
Buck
3.3V
PWM1H
Gate
Drivers
VDD
VFB Buck
PWM1L
AN1
VFB Buck
VIN
Fuse
SW1
BUCK
TEMP
SENSOR
BOOST
TEMP
SENSOR
PWM2L
MUX
AN2
AN7
AN3
RB13
USB
FIGURE 1-2:
Gate
Driver
VFB Boost
Current Sense
Boost
VFB Boost
See Figure 1-2
See Figure 1-2
SCL
SDA
LCD
On-Board
Debugger
PC
15V
RB6
Voltage/Current/
Temperature/Fault/Load
BUCK/BOOST RESISTIVE INTERNAL LOAD CONFIGURATION OPTION
Buck
Resistive
Loads
Boost
Resistive
Loads
3.3V
R1
R2
R3
15V
R4
R5
R6
Gate Drivers
SCL
SDA
I2C™ Communication
with dsPIC® DSC
Note 1:
2:
I/O
Expander
R1 = 22Ω
R2 = R3 = 8.7Ω
R4 = 450Ω
R5 = R6 = 180Ω
When both converters are programmed to their nominal values of 3.3V and 15V, and all internal loads are enabled, each
converter is loaded with 3W.
2015 Microchip Technology Inc.
DS50002330B-page 17
Digital Power Starter Kit User’s Guide
1.3.1
Power Stages
• One Boost converter power stage
• One synchronous Buck converter power stage
1.3.2
Display
• Voltage, current, temperature, internal load setting and converter status
(enabled/disabled)
1.3.3
Converter Loads
• Buck 3W configurable resistive load
• Boost 3W configurable resistive load
1.3.4
Additional Features
• Two on-board temperature sensors, located near the resistive loads of each
converter; this enables the user to program a temperature protection limit
• Input voltage sense, used to detect under/overvoltage conditions
• Connector for PICkit™ 3 Programmer/Debugger (J3)
• LED power-on indicator (D1)
• Load indication LEDs
• LCD used to display voltage, internal load, temperature and Fault conditions
1.3.5
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 programmer/
debugger
• Buck and Boost converters are both operated in Peak Current Mode (default), but
can also be reprogrammed to operate in Average Current or Voltage Current
Control mode; this requires minor hardware changes to the current sense and slope
compensation circuits
Note:
Average Current mode control requires the following changes:
Buck Converter:
R5 – DNP
R14 – DNP
C26 – 0 Ohm
Boost Converter:
R7 – DNP
R13 – DNP
R62 – 0 Ohm
C20 – 0 Ohm
DS50002330B-page 18
2015 Microchip Technology Inc.
Introduction
1.4
ELECTRICAL SPECIFICATIONS
TABLE 1-1:
DC INPUT RATING (J2)
Parameter
Minimum
Typical
Maximum
Unit
Voltage
7.0
9
11
V
Current
—
1.3
—
A
TABLE 1-2:
BUCK CONVERTER ELECTRICAL SPECIFICATIONS
Parameter
Output Voltage (default programmed)
Output Voltage (programmable
range)(1)
Output Voltage Ripple
Minimum
Typical
Maximum
Unit
—
3.3
—
V
2.4
—
3.8
V
—
50
—
mV (pk-pk)
Output Current
—
—
2.5
A
Load Regulation:
VOUT = 3.3V, IOUT = 0.02 – 1.51A, VIN = 9V
—
50
—
mV/A
Switching Frequency
—
350
—
kHz
Output Power
—
3(1)
5(2)
W
Note 1:
2:
Maximum power of resistive loads should not exceed 3W.
Ensure that 5W maximum is never exceeded, regardless of the output voltage and current.
TABLE 1-3:
BOOST CONVERTER ELECTRICAL SPECIFICATIONS
Parameter
Output Voltage (default programmed)
Minimum
Typical
Maximum
Unit
—
15
—
V
13.4
—
17.8
V
Output Voltage Ripple
—
100
—
mV (pk-pk)
Output Current
—
—
0.37
A
Load Regulation:
VOUT = 15V, IOUT = 0.02 – 0.33A, VIN = 9V
—
50
—
mV/A
Switching Frequency
—
350
—
kHz
—
3(1)
5(2)
W
Output Voltage (programmable range)(1)
Output Power
Note 1:
2:
Maximum power of resistive loads should not exceed 3W.
Ensure that 5W maximum is never exceeded, regardless of the output voltage and current.
2015 Microchip Technology Inc.
DS50002330B-page 19
Digital Power Starter Kit User’s Guide
NOTES:
DS50002330B-page 20
2015 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:
2015 Microchip Technology Inc.
DIGITAL POWER STARTER KIT (TOP VIEW)
DS50002330B-page 21
Digital Power Starter Kit User’s Guide
TABLE 2-1:
DIGITAL POWER STARTER KIT COMPONENTS (TOP VIEW)
Number
Description
1
2x16 Character LCD
2
Push Button (SW1)
3
dsPIC33 ‘GS’ Digital Signal Controller (DSC) (U3)
4
Voltage Regulator (3.3V)
5
9V Power Connector (J2)
6
Buck Converter Stage
7
Boost Converter Stage
8
Buck Temperature Sensor
9
Boost Temperature Sensor
10
PICkit™ 3 Programmer/Debugger
FIGURE 2-2:
TABLE 2-2:
DIGITAL POWER STARTER KIT (BOTTOM VIEW)
DIGITAL POWER STARTER KIT COMPONENTS (BOTTOM VIEW)
Number
DS50002330B-page 22
Description
1
Buck Load
2
Boost Load
3
Buck PWM Drive Circuit
4
Boost PWM Drive Circuit
5
On-Board PKOB Programmer/Debugger Circuit
6
Voltage Regulator (+5V)
7
Programmer/Debugger USB Connector (J5)
2015 Microchip Technology Inc.
Hardware
2.2
SIGNAL CONFIGURATION
Table 2-3 provides a full list of the dsPIC33 ‘GS’ DSC connections and a brief functional
description of the pins used in the Digital Power Starter Kit.
TABLE 2-3:
dsPIC33 ‘GS’ CONFIGURATION DETAILS
Digital Power Starter Kit
Signal Label
Pin
#
ICSP_MCLR_VPP_Target
1
MCLR
Master Clear (Reset) Input
CS_BUCK
2
AN0
Analog – Buck Current Sense
VFB_BUCK
3
AN1
Analog – Buck Voltage Feedback
CS_BOOST
4
AN2
Analog – Boost Current Sense
VFB_BOOST
5
AN3
Analog – Boost Voltage Feedback
Device Pin Function
Description/Function
VIN_FB
6
AN4
Analog – Input Voltage Feedback
LCD_CLOCK
7
RB10
Clock to LCD Device
8
VSS
Ground
LCD_DATA
—
9
RB1
Data to LCD Device
TEMP_SENSE
10
AN7
Analog – Temperature Sensor
PGD2
11
PGD2
Data I/O Pin for Programming/
Debugging Communication Channel 2
PGC2
12
PGC2
Clock Input Pin for Programming/
Debugging Communication Channel 2
13
VDD
Positive Supply for Peripheral Logic and
I/O Pins
14
RB8
SW1 Push Button
LCD_RESET
15
RB15
LCD Active-Low Reset Signal
LCD_RSELECT
16
RB5
LCD Register Select Signal
SCL
17
SCL1
LCD Serial Clock
SDA
18
SDA1
LCD Data
—
19
VSS
Ground
—
20
VCAP
CPU Logic Filter Capacitor Connection
LCD_CSB
21
RB11
Active-Low LCD Chip Select Signal
GPIO1
22
RB12
General Purpose I/O
GPIO2
23
RB13
General Purpose I/O
PWM2L
24
PWM2L
Boost PWM Drive Signal
PWM1H
25
PWM1H
Buck Converter High Drive Signal
PWM1L
26
PWM1L
Buck Converter Low Drive Signal
—
27
AVSS
Analog Ground
—
28
AVDD
Analog Positive Supply
—
SW
2015 Microchip Technology Inc.
DS50002330B-page 23
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
Description
Top Assembly Components (see Figure 2-1)
dsPIC33 ‘GS’
U3
Provides the processing power for the demonstration applications and
application development on the starter kit.
3.3V Voltage Regulator
U2
Voltage regulator (3.3V) provides power to the dsPIC33, LCD,
I/O expander device, push button and temperature sensors.
9V Power Connector
J2
A 9V power supply powers the on-board 5V regulator, and loads the
MOSFET drivers, as well, to the Buck and Boost DC/DC converters on
the starter kit.
Buck Converter Stage
BUCK
Boost Converter Stage
BOOST
Buck/Boost Converter
Temperature Sensor
U7/U5
Step-down converter with three on-board resistive selectable loads.
Step-up converter with three on-board resistive selectable loads.
The temperature sensor is strategically placed near the Buck/Boost
load resistors. They are intended to provide the board temperature to
the DSC and to disable all of the Buck/Boost resistive loads if the
temperature exceeds the set limit.
Bottom Assembly Components (see Figure 2-2)
Buck Resistive Load
Boost Resistive Load
BUCK RLOAD
3.6 Ohm resistive load (3W max).
BOOST RLOAD 75 Ohm resistive load (3W max).
Buck PWM Drive Circuit
U9
Dual high-speed power FET drivers used to turn on/off the Buck
resistive loads.
Boost PWM Drive Circuit
U4
Dual high-speed power FET drivers used to turn on/off the Boost
resistive loads.
On-Board Programmer/
Debugger
PKOB
Controls the programming/debugging operations of the target
dsPIC33.
5V Voltage Regulator
U1
Voltage regulator (5V) provides power to the 3.3V regulator and
to the Buck stage gate driver (U9).
Programmer/Debugger
USB Connector
J5
Provides power to the programmer/debugger and bidirectional
communication between the host PC and starter kit.
DS50002330B-page 24
2015 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:
HARDWARE CONNECTIONS
Label
J1
2.5
Hardware Element Description
Connector for PICkit™ Programmer/Debugger.
J2
9V power supply.
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:
Label
INDICATORS AND HUMAN INTERFACES
Hardware Element Description
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.
D12, D18,
D19
Buck converter load LEDs. See schematic for details.
D5, D20,
D21
Boost converter load LEDs. See schematic for details.
2015 Microchip Technology Inc.
DS50002330B-page 25
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
TP1
DS50002330B-page 26
Description
+3.3V Regulator Output Voltage
TP2
+15V Boost Voltage Output Voltage
TP3
CS_BOOST (White)
TP4
Ground
TP5
+3.3V Buck Voltage Output
TP6
Boost Converter Bode Test Point (Orange)
TP7
N/A
TP8
+3.3V_PKOB
TP9
Buck Converter Bode Test Point (Orange)
TP10
CS_BUCK
TP11
Buck Converter High-Side MOSFET Gate Signal Test Point
TP12
Buck Converter Low-Side MOSFET Gate Signal Test Point
TP13
Boost Converter MOSFET Gate Signal Test Point
TP14
VFB_BUCK
TP15
VFB_BOOST
TP16
Boost 0.5W Load MOSFET Gate Signal Test Point
TP17
Buck 0.5W Load MOSFET Gate Signal Test Point
TP18
Buck Converter Bode Test Point (Yellow)
TP19
+9V DPSK Board Input Voltage
TP20
Boost Converter Bode Test Point (Yellow)
TP21
Buck PWM1L Gate Drive Signal (White)
TP22
Buck Converter Switch Node Test Point
TP23
Buck PWM1H Gate Drive Signal (White)
TP24
Boost PWM2L Gate Drive Signal (White)
TP25
First Buck 1.25W Load MOSFET Gate Signal Test Point
TP26
Second Buck 1.25W Load MOSFET Gate Signal Test Point
TP27
First Boost 1.25W Load MOSFET Gate Signal Test Point
TP28
Second Boost 1.25W Load MOSFET Gate Signal Test Point
TP29
GND
TP30
GND
2015 Microchip Technology Inc.
Hardware
FIGURE 2-3:
DIGITAL POWER STARTER KIT TEST POINT LOCATIONS
TP21
TP23
BUCK_OUT
TP9
TP15
TP24
TP18
TP20
TP14
TP6
TP3
TP10
TP4
TP1
2015 Microchip Technology Inc.
BOOST_OUT
TP19
DS50002330B-page 27
Digital Power Starter Kit User’s Guide
2.7
POWER RATING OF CONVERTER STAGES
The Digital Power Starter Kit is designed to be a self-contained power supply with each
converter having three on-board resistive loads. Each converter includes one resistive
0.5W load and two resistive 1.25W loads for a total of 3W when the converters are
programmed to their nominal output voltages only. See Figure 1-2 for more details on
hardware configuration.
Note:
2.7.1
The output voltages should not be programmed to exceed their nominal
values when using the on-board resistive loads as this can cause the
resistive loads to exceed their power handling capabilities, leading to
potential damage of the board.
Buck Converter
The Buck converter stage is rated for a maximum of 5W. However, the maximum
on-board configurable resistive load is 3W. 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 from a 2.4V to 3.84V output, with a default
programmed voltage of 3.3V. The hardware gain, 3.16k/(3.16k + 1k + 20), 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 (1:125) and burden
resistor, R69.
FIGURE 2-4:
BUCK CONVERTER SOA CURVE
2.5
Output Current (A)
2
1.5
1
0.5
0
0
1
2
3
4
5
Output Voltage (V)
DS50002330B-page 28
2015 Microchip Technology Inc.
Hardware
2.7.2
Boost Converter
The Boost converter stage is rated for a maximum of 5W. However, the maximum
on-board configurable resistive load is 3W. 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 from a 13.4V to 17.8V output, with a
default programmed voltage of 15V. The hardware gain, 1k/(1k + 5.1k + 20), 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 resistors, R6 and R61.
FIGURE 2-5:
BOOST CONVERTER SOA CURVE
Output Current (A)
0.4
0.3
0.2
0.1
0
10
12
14
16
18
20
Output Voltage (V)
2.8
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.
TABLE 2-8:
PROGRAMMER/DEBUGGER COMPONENTS
Component
Label
On-Board Programmer/
Debugger
N/A
Programmer/Debugger
USB Connector
J5
2015 Microchip Technology Inc.
Description
Controls the programming/debugging operations of the target
dsPIC33 ‘GS’ DSC.
Provides power to the programmer/debugger, and bidirectional communication
between the host PC and the Digital Power Starter Kit.
DS50002330B-page 29
Digital Power Starter Kit User’s Guide
NOTES:
DS50002330B-page 30
2015 Microchip Technology Inc.
DIGITAL POWER STARTER KIT
USER’S GUIDE
Chapter 3. Demonstration Program Operation
The dsPIC33 ‘GS’ on the Digital Power Starter Kit is preprogrammed with Peak Current
Mode control application software that illustrates simultaneous 2-Pole, 2-Zero (2P2Z)
compensator control of the output voltage for the two DC/DC converter circuits. 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.
The 2P2Z control loop controls the Buck converter output voltage to 3.3V and the Boost
converter output voltage to 15V.
The 2P2Z control scheme consists of the following parameters:
• Reference – Desired set point for the output voltage
• Error – Calculation of (Reference – Feedback). This is the value the compensator
acts upon
• System Plant – This is the converter being controlled
• Output – Either the output voltage or current
• Feedback – The measured output signal level
Please refer to Section 3.2.4 “2P2Z SW Control Compensator” for further
details.The demonstration program requires no manual preparation except to connect
9V to the J2 connector.
FIGURE 3-1:
PEAK CURRENT MODE CONTROL LOOP BLOCK DIAGRAM
System Plant
Calculated
Peak
Current
Voltage
Reference
–
+
DAC
K2
Current
Sense
Internal Comparator
Error
+
VOUT
2P2Z
Compensator
PWM
–
Voltage Feedback
1001011011
ADC
2015 Microchip Technology Inc.
Inductor
VOUT
Sense
K1
S&H
DS50002330B-page 31
Digital Power Starter Kit User’s Guide
FIGURE 3-2:
SMPS DEMONSTRATION PROGRAM FLOW CHART
Start
Initialization Routines:
• Peripherals – ADC, PWM, Timers, GPIO,
LCD, etc.
• Variables – Buck/Boost Compensator Coefficient
Initializations, Data Buffers
• Interrupts – ADC, Timers
• Set Soft Start Flag
• Initialize I2C™ Module and Initialize Load Configuration
(static/dynamic)
Fault Check Routine
Does Fault
Condition Exist?
Yes
Disable
Outputs
and Display
Fault(s) on
LCD Screen
ADC Interrupts
No
Soft Start Routine
ADC Interrupt Routines:
Soft Start
Routine
Yes
Is Soft
Start Active?
•
•
•
•
•
•
Monitor Converter Currents
Update PWM Duty Cycles
Monitor VIN is Within Allowable Limits
Monitor Converter Temperature(s)
Monitor Converter Voltages
Check if Fault Flags are Active
No
Endless (while (1)) Loop Functions:
End
• Update LCD Display Information
• Display Faults (if any)
• Check if SW1 has been Pressed (to toggle what is viewed
on display)
DS50002330B-page 32
2015 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, Comparators, I2C™ module,
Timers and GPIO) are configured and enabled.
• Interrupts – Include ADC(s), Timer(s), I2C and comparator(s) interrupts.
• Loads – Can be configured for either Static mode or Dynamic mode. If Dynamic
mode is selected, a switching frequency can be configured in application SW.
3.2.2
Fault Check
The program checks for any Faults that might have occurred during program operation.
The Fault checks include the following:
• Input Over/Undervoltage
• Buck/Boost Converter Overtemperature
• Buck/Boost Soft Start
If any of the listed Faults occur, the corresponding Fault will be shown on the LCD
display. The corresponding PWM signals and loads are disabled until the Fault condition has been cleared. Fault checks are dispersed throughout all the interrupts. If no
Fault condition is detected, the program proceeds.
3.2.3
Soft Start
The Soft Start routine ramps up the output voltage in a closed-loop fashion until it is at
the programmed output voltage value. This routine ensures that the output does not
overshoot the desired voltage.
3.2.4
2P2Z SW Control Compensator
The 2-Pole, 2-Zero (2P2Z) controller implemented in SW is the digital implementation
of the Analog Type II controller. This filter maintains regulation of the output voltage and
ensures stability during different line/load conditions. This controller requires three
feedback errors, multiplied by their associated coefficients, plus the two latest controller
output values, multiplied by their associated coefficients, along the delay line to provide
proper compensation of the power converter. The coefficients are determined
externally using simulation tools.
Reference the smps_2p2z_dspic.s library and smps_control.h header files in
the DPSK software package for further implementation details.
3.2.5
System While (1) Loop
The LCD refresh functions are called within the system Idle routine. The routine
refreshes the LCD screen based on both user input (SW1) and converter feedback
(Fault flags/VIN measurement/converter output voltage). All Fault display updates are
performed in the system Idle loop routine, as well as the toggling of the displayed
measurements as the results of pressing SW1.
2015 Microchip Technology Inc.
DS50002330B-page 33
Digital Power Starter Kit User’s Guide
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.
DS50002330B-page 34
2015 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)
2015 Microchip Technology Inc.
DS50002330B-page 35
Digital Power Starter Kit User’s Guide
FIGURE A-2:
DS50002330B-page 36
DIGITAL POWER STARTER KIT LAYOUT (BOTTOM)
2015 Microchip Technology Inc.
2015 Microchip Technology Inc.
GND
1800 pF
50V
0603
C 21
GND
T P LOOP Bl ack
T P4
JACK Power 2.5 mm Male
1
3
2
GND
2.21k 1%
0603
R4
C 57
3
1
2
GND
GND
C7
GND
L3
0.1 μF
50V
0603
R 17
0R
1
A GND
0.1uF
50V
0603
C8
A V DD
VOUT
3
GND
2 MCP1703/3.3V
GND
GND
VCAP
10 μF
16V
0805
C4
1
2
3
4
5
6
J3
DNP
GND
330R 1%
0603
R2
GREEN
0603
D1
+3.3V
HDR-1 .27 Male 1x6
+3.3V
GND
GND
0.1 μF
50V
0603
C3
dsPIC33 GS Series
8
VS S
19
VS S
27
AVSS
13
VDD
28
AV DD
20
10k 1%
U3
0603
1
MCLR
R12
+3.3V
PGD2
PGC2
ICSP_MCLR_VPP_TARGET
V IN
U2
ICSP_MCLR_ VPP_ TARGET
10 μF
16V
0805
C2
GND
+5V
C11
+3.3V
+3.3V
0.1uF
50V
0603
16V 0805
10 μF
GND
3
VOUT
GND
2 MCP1703/5V
C14
GND
BA T 54SL T 1
D15
V IN
U1
+3.3V
1
T P LOOP Red
10 μF
16V
0805
T P 19
V IN _FB
1%
10k
0603
R1
GND
+9V
5
9
10
11
12
16
17
18
14
6
7
21
22
23
24
15
2
AN0/CMP1A
3
AN1
4
AN2/CMP2A
26
PWM1L
25
PWM1H
AN3
RB1
AN7
PGED2
PGEC2
RB5
SCL1
SDA1
RB8
AN4
RB10
RB11
RB12
RB13
PWM2L
RB15
T P1
SW
VIN _FB
LCD _CLOCK
LCD _CSB
GPIO1
GPIO2
PWM2L
LCD _RESET
VFB_ BOOST
LCD _DATA
TEMP_SENSE
PGD2
PGC2
LCD _RSELECT
PWM1L
PWM1H
CS _BUCK
T P LOOP Red
0R
0R
1
2
GND
+3.3V
D11
1
2
130 pF
50V
0603
GND
C5
130 pF
50V
0603
2.2k 1%
0603
R166
+3.3V
SCL
SDA
+3.3V
SW
GND
BA T 54SL T 1
3
R165
C1
GND
R9
0R
0603
2.2k 1%
0603
+3.3V
VFB_ BUCK
TP24 T P L OOP White
BAT54SLT1
3
D16
C6
0.1 μF
50V
0603
1%
10k
0603
R8
GND
CS _BOOST
TP21 T P L OOP White
TP23 T P L OOP White
DNP
R60
0603
R59
0603
R56
DNP
R53
3
2
GND
4
1 SW1
+3.3V
C 67
0.1 μF
50V
0603
C29
0.1 μF
50V
0603
GND
+3.3V
GND
+3.3V
U5
4
GND
VOUT
MCP9700
VDD
U7
GND
VOUT
MCP9700
V DD
1
NC
5
NC
4
1
NC
5
NC
2
3
2
3
GND
GND
GND
C30
0.1 μF
50V
0603
120R 1%
0603
R72
0.1 μF
50V
0603
GND
C66
120R 1%
0603
R10
+3.3V
GND
1 μF
16V
0603
C9
Buck
T E MP_SE NSE _U7
T E MP_SE NSE _U5
Boost
1
2
1
2
D10
D8
GND
GND
+3.3V
GND
+3.3V
0R
1 μF
16V
C12
1 μF
16V
0603
GND
+3.3V
C1-
LCD1
R23
VSS
RS
CSB
SI
SCL
RST
VDD
60.4R 1%
1206
6
2
3
5
4
1
7
9
C1+
8
VOUT
10
1
2
3
4
5
6
J1
C68
GND
0.1 μF
50V
0603
C13
0.1 μF
50V
0603
GPIO2
+3.3V
TE MP_SE NSE
GND
GND
SDA
SCL
GPIO2
GPIO1
6
S
5
VCC
4
A
74LVC1G3157
U6
1
B2
2
GND
3
B1
+3.3V
LCD_RSELECT
LCD_CSB
LCD _DATA
LCD_CLOCK
LCD_RESET
R21
0603
C10
GND
3
DNP
3
DNP
I2C™ Communication
NHD-C0216CZ-FSW-FB W-3V 3
FIGURE A-3:
K
A
J2
Board Layout and Schematics
DIGITAL POWER STARTER KIT SCHEMATIC REV. 1.2
DS50002330B-page 37
PWM1L
PWM1H
GND
C33
4.7 μF
25V
0805
1% 3.3k
0603
GND
R107
R106
0.1 μF
50V
0603
C 34
6
3
2
Vcc
PWM_L O
PWM_HI
GND
4
GND
BO OT
L OWDR
PHA SE
HIG HDR
U9
MCP14700
5
1
8
0.1 μF 50V
0603
DNP
7
C32
D9
1% 3.3k
0603
+5V
47 pF
50V
0603
C28
GND
470 pF
50V
1206
C26
1.2k 1%
0603
R 68
T P 10 T P L OOP White
R5
27K 1%
1206
120R 1%
0603
R69
R70
DNP
R 96
0603
11R 1%
11R 1% 0603
R79
BA T 54
D6
R14
5.1R 1%
0805
BAT 54
D7
8
1%
10k
0603
R104
TP12
G
1%
10k
0603
R74
G
T P 11
3
7
CST2-125LB
1T 1
D
S
CS _BUCK
GND
C31
22 μH
DNP
C39
DNP
R91
T P 22
L2
220 μF
50V
GND
+9V
MCP87050
Q5
MCP87050
Q3
D
DS50002330B-page 38
S
GND
100 μF
35V
C35
100 μF
35V
C37
100 μF
35V
C24
GND
4.7 μF
25V
0805
C58
+9V
VDD
U 8B
T C4427A
VDD
U 8A
+3.3V
SCL
SDA
0.1 μF
50V
0603
GND
T P 29
GND
MCP23008
18
VD D
17
V SS
21
EP
1
A2
2
A1
3
A0
4
RESE T
7
INT
U 13
3
5
3
19
SCL
20
SDA
GND
GND
7
9
10
11
12
13
14
15
16
5
NC
8
NC
6
NC
GP0
GP1
GP2
GP3
GP4
GP5
GP6
GP7
D1
R152
R3
GND
R150
3.3k 1%
0603
I9
R147
T P 17
3.3k 1%
0603
I10
I4
I9
I10
I1
I12
I11
1%
11R
0603
R71
GND
4
GND
D2
GND
+9V
D12
GREEN
DNP
D3
GND
0.1 μF
50V
0603
VDD
T C4427A
U 14B
V DD
U 14A
GND
GND
GND
10k 1%
0603
R 19
T P 25
4
GREEN
0603
R103
2.21k 1%
0603
C61 T C4427A
6
4
6
2
11R 1%
0603
R16
Q4
1,2,3
GREEN
DNP
GND
DNP
DNP
C60
4.7 μF
25V
0805
+9V
D9
R 92
22R 1%
1206
R80
22R 1%
1206
5,6,7,8 NT MS5838NL
10k 1%
0603
GND
R85
22R 1%
1206
R75
22R 1%
1206
0.5W
R 98
GND
DNP
C64
T P L OOP Red
TP5
1935161
GND
D4
D4
J7
+3.3V
GND
T P L OOP Black
GND
C59 T C4427A
0.1 μF
50V
0603
6
4
6
2
1800 pF
50V
0603
V FB_ BUCK
C40
C27
+3.3V
TP9
T P L OOP Orange
GND
+9V
T P 14
20R 1%
0805
R90
GND
3.16k 1%
0603
1k 1%
0603
R97
C36
1 μF
16V
0603
R105
GND
3.3k 1%
0603
R149
I1
3.3k 1%
0603
R146
I4
22 μF
16V
1206
C38
T P 18
T P L OOP Y ellow
3
5
3
7
GND
GND
1,2,3
Q9
D9
D10
GND
R151
3.3k 1%
0603
I12
R148
I11
D10
6.49R 1%
1206
R94
R87
6.49R 1%
1206
6.49R 1%
1206
R82
R77
6.49R 1%
1206
3.3k 1%
0603
5,6,7,8 NT MS5838NL
R93
6.49R 1%
1206
6.49R 1%
1206
R86
6.49R 1%
1206
R88
6.49R 1%
1206
R83
R81
6.49R 1%
1206
6.49R 1%
1206
R76
6.49R 1%
1206
R78
6.49R 1%
1206
R99
1.25W
C 62
R145
T P 26
GND
R95
4
VD D
U 15B
T C4427A
VDD
U 15A
C 63 T C4427A
0.1 μF
50V
0603
6
4
6
Q10
1,2,3
GND
2
6.49R 1%
1206
R84
R25
6.49R 1%
1206
6.49R 1%
1206
R20
R100
6.49R 1%
1206
GND
GND
7
3
5
3
GND
6.49R 1%
1206
R89
R55
6.49R 1%
1206
6.49R 1%
1206
R22
R101
6.49R 1%
1206
5,6,7,8 NT MS5838NL
6.49R 1%
1206
R73
R24
6.49R 1%
1206
6.49R 1%
1206
R102
6.49R 1%
1206
GND
+9V
GND
10k 1%
0603
4.7 μF
25V
0805
+9V
11R 1%
0603
R144
D18
GREEN
0603
2.21k 1%
0603
R15
1.25W
D12
D11
D19
GREEN
0603
R18
2.21k 1%
0603
FIGURE A-4:
1 2
Buck Converter
Digital Power Starter Kit User’s Guide
DIGITAL POWER STARTER KIT SCHEMATIC REV. 1.2 (BUCK CONVERTER)
2015 Microchip Technology Inc.
2015 Microchip Technology Inc.
PWM2L
0.1 μF
50V
0603
C23
GND
+9V
3.3k 1%
0603
R58
+9V
GND
1A
1206
F1
4.7 μF
25V
0805
C22
GND
6
4
6
2
22 μF
25V
1210
C16
T C4427A
VDD
U 4B
T C4427A
VDD
U 4A
GND
GND
GND
0.1 μF
50V
0603
C15
3
5
3
7
GND
120 μH
L1
R52
11R 1%
0603
1%
10k
0603
R57
T P 13
G
D
GND
3.9R 1%
1206 1/2W
R61
MCP87050
Q2
Z1
PWM2L
GND
3.9R 1%
1206 1/2W
R6
SMF26A -T P
SS33
D4
C17
R13
5.1R 1%
0805
R7
GND
DNP
T P6
R41
R51
C19
V FB_ BOOST
1800 pF
50V
0603
T P 3 T P L OOP White
CS _BOOST
2200 pF
50V
1206
C20
1k 1%
0603
T P 15
T P 30
GND
T P LOOP Black
T P LOOP Orange
5.1k 1%
0603
GND
C25
10 μF
35V
1206
C18
5.6K 1%
1206
BA T 54
D17
10R 1%
0603
R62
220 μF
50V
R30
20R 1%
0805
T P 20
T P L OOP Yellow
TP2
11R 1%
0603
R45
1935161
GND
D1
J8
+15V
1 2
TP16
GND
4
R36
R37
470R 1%
1206
R27
470R 1%
1206
10k
0603
1% GND
1,2,3
D11
NT MS5838NL
5,6,7,8 Q1
470R 1%
1206
R26
0.5W
470R 1%
1206
R154
GND
DNP
C65
T P L OOP Red
R163
TP27
GND
10k 1%
0603
11R 1%
0603
R161
D5
GREEN
0603
10k 1%
0603
R35
4
R31
R157
137R 1%
1206
137R 1%
1206
R48
R40
137R 1%
1206
137R 1%
1206
1,2,3
NT MS5838NL
R156
137R 1%
1206
5,6,7,8 Q11
GND
R155
137R 1%
1206
R47
137R 1%
1206
R46
R39
137R 1%
1206
137R 1%
1206
R38
137R 1%
1206
R29
137R 1%
1206
R28
137R 1%
1206
1.25W
D12
R164
TP28
GND
10k 1%
0603
11R 1%
0603
R162
D21
GREEN
0603
R66
10k 1%
0603
4
R33
R34
R160
137R 1%
1206
137R 1%
1206
R153
R44
137R 1%
1206
137R 1%
1206
1,2,3
NT MS5838NL
R159
137R 1%
1206
137R 1%
1206
R50
R43
137R 1%
1206
137R 1%
1206
5,6,7,8 Q12
GND
R158
137R 1%
1206
137R 1%
1206
R49
R42
137R 1%
1206
137R 1%
1206
R32
1.25W
D20
GREEN
0603
R63
10k 1%
0603
FIGURE A-5:
S
Boost Converter
Board Layout and Schematics
DIGITAL POWER STARTER KIT SCHEMATIC REV. 1.2 (BOOST CONVERTER)
DS50002330B-page 39
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01/27/15
DS50002330B-page 40
2015 Microchip Technology Inc.
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