Microchip MCP1012 User Manual
MCP1012
1W Demonstration Board
User’s Guide
2020 Microchip Technology Inc. DS50002932A
Note the following details of the code protection feature on Microchip devices:
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please visit www.microchip.com/quality.
ISBN: 978-1-5224-5618-6
DS50002932A-page 2 2020 Microchip Technology Inc.
MCP1012
1W DEMONSTRATION BOARD
USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 5
Introduction............................................................................................................ 5
Document Layout .................................................................................................. 5
Conventions Used in this Guide ............................................................................ 7
Recommended Reading........................................................................................ 8
The Microchip Website.......................................................................................... 8
Customer Support ................................................................................................. 8
Document Revision History ................................................................................... 8
Chapter 1. Product Overview
1.1 Introduction ..................................................................................................... 9
1.2 MCP1012 Short Overview
1.3 MCP1012 1W Demonstration Board Description ......................................... 10
1.4 Contents of the MCP1012 1W Demonstration Board Kit ............................. 11
(1)
.......................................................................... 9
Chapter 2. Installation and Operation
2.1 Getting Started ............................................................................................. 13
2.2 Setup Procedure .......................................................................................... 13
Chapter 3. Setup One
3.1 Setup 1A ....................................................................................................... 15
Introduction.......................................................................................................... 15
Steps ................................................................................................................... 15
3.2 Setup 1B ....................................................................................................... 16
Introduction.......................................................................................................... 16
Steps ................................................................................................................... 16
Chapter 4. Setup Two
4.1 Setup 2 ......................................................................................................... 19
Introduction.......................................................................................................... 19
Steps ................................................................................................................... 19
Chapter 5. Setup Three
5.1 Setup 3 ......................................................................................................... 23
Introduction.......................................................................................................... 23
Steps ................................................................................................................... 23
Chapter 6. Setup Four
6.1 Setup 4A ....................................................................................................... 27
Introduction.......................................................................................................... 27
2020 Microchip Technology Inc. DS50002932A-page 3
MCP1012 1W Demonstration Board User’s Guide
Steps ................................................................................................................... 27
6.2 Setup 4B ....................................................................................................... 28
Introduction.......................................................................................................... 28
Steps ................................................................................................................... 28
Chapter 7. Setup Five
7.1 Setup 5 ......................................................................................................... 31
Introduction.......................................................................................................... 31
Steps ................................................................................................................... 31
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 33
A.2 Board – Schematic ....................................................................................... 34
A.3 Board – Top Silk .......................................................................................... 35
A.4 Board – Top Copper and Silk ....................................................................... 35
A.5 Board – Top Copper .................................................................................... 36
A.6 Board – Bottom Copper ............................................................................... 36
A.7 Board – Bottom Copper and Silk ................................................................. 37
A.8 Board – Bottom Silk ..................................................................................... 37
Appendix B. Bill of Materials (BOM) ...........................................................................39
Worldwide Sales and Service .....................................................................................43
DS50002932A-page 4 2020 Microchip Technology Inc.
MCP1012
1W DEMONSTRATION BOARD
USER’S GUIDE
Preface
NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and
documentation are constantly evolving to meet customer needs, so some actual dialogs
and/or tool descriptions may differ from those in this document. Please refer to our website
(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
Select the Help menu, and then Topics to open a list of available online help files.
®
IDE online help.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP1012 1W Demonstration Board. Items discussed in this chapter include:
• Document Layout
• Conventions Used in this Guide
• Recommended Reading
• The Microchip Website
• Customer Support
• Document Revision History
DOCUMENT LAYOUT
This document describes how to use the MCP1012 1W Demonstration Board as a
development tool. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP1012 1W
Demonstration Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with the MCP1012 1W Demonstration Board and a description of each
function.
• Chapter 3. “Setup One” – Description of the functioning of the MCP1012 in
Start-Up mode when it is supplied by the secondary side of the transformer and no
load is applied at the output (neither of the R20, R21, R22, or R23 resistors is connected) (setup 1A) as well as a description of the functioning of the MCP1012 in
Start-Up mode when it is supplied by the secondary side of the transformer and a
load is applied at the output (the resistor R21 - 68is connected through SW1.2)
(setup 1B).
• Chapter 4. “Setup Two” – Description of the functioning of the MCP1012 in
Start-Up mode when it is supplied by an external power supply (15V) at V
DD pin
2020 Microchip Technology Inc. DS50002932A-page 5
MCP1012 1W Demonstration Board User’s Guide
and a load is applied at the output (the resistor R20 - 51is connected through
SW1.1).
• Chapter 5. “Setup Three” – Description of the Sleep/Wake-Up functions of the
MCP1012 in Start-Up mode when it is supplied by an external power supply (15V)
at V
DD pin and a load is applied at the output (the resistor R20 - 51is connected
through SW1.1).
• Chapter 6. “Setup Four” – A description of the functioning of the MCP1012 in
Normal Run mode when an external command is applied at PULSE pin and the
C/S pin voltage does not reach the COMP1 Reference (252 mV) (setup 4A) as
well as a description of the functioning of the MCP1012 in Normal Run mode
when an external command is applied at PULSE pin and the C/S pin voltage
reaches the COMP1 Reference (252 mV) (setup 4B).
• Chapter 7. “Setup Five” – Description of the functioning of the MCP1012 in
Start-Up mode when a short circuit is created on the secondary side of the
transformer.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layouts for
the MCP1012 1W Demonstration Board.
• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the
MCP1012 1W Demonstration Board.
DS50002932A-page 6 2020 Microchip Technology Inc.
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description Represents Examples
Arial font:
Italic characters Referenced books MPLAB
Initial caps A window the Output window
Quotes A field name in a window or
Underlined, italic text with
right angle bracket
Bold characters A dialog button Click OK
N‘Rnnnn A number in verilog format,
Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>
Courier New font:
Plain Courier New Sample source code #define START
Italic Courier New A variable argument file.o, where file can be
Square brackets [ ] Optional arguments mcc18 [options] file
Curly brackets and pipe
character: { | }
Ellipses... Replaces repeated text var_name [,
Preface
®
IDE User’s Guide
Emphasized text ...is the only compiler...
A dialog the Settings dialog
A menu selection select Enable Programmer
“Save project before build”
dialog
A menu path File>Save
A tab Click the Power tab
4‘b0010, 2‘hF1
where N is the total number of
digits, R is the radix and n is a
digit.
Filenames autoexec.bat
File paths c:\mcc18\h
Keywords _asm, _endasm, static
Command-line options -Opa+, -Opa-
Bit values 0, 1
Constants 0xFF, ‘A’
any valid filename
[options]
Choice of mutually exclusive
arguments; an OR selection
Represents code supplied by
user
errorlevel {0|1}
var_name...]
void main (void)
{ ...
}
2020 Microchip Technology Inc. DS50002932A-page 7
MCP1012 1W Demonstration Board User’s Guide
RECOMMENDED READING
This user's guide describes how to use the MCP1012 1W Demonstration Board.
Another useful document is listed below. The following Microchip document is available
and recommended as a supplemental reference resource:
• MCP1012 Data Sheet - “Primary Side Start-Up IC for Isolated Converters”
(DS20006277)
THE MICROCHIP WEBSITE
Microchip provides online support via our website at www.microchip.com. This website
is used as a means to make files and information easily available to customers.
Accessible by using your favorite Internet browser, the website contains the following
information:
• Product Support – Data sheets and errata, application notes and sample
programs, design resources, user’s guides and hardware support documents,
latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical
support requests, online discussion groups, Microchip consultant program
member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip
press releases, listing of seminars and events, listings of Microchip sales offices,
distributors and factory representatives
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
• Distributor or Representative
• Local Sales Office
• Field Application Engineer (FAE)
• Technical Support
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 website at:
http://www.microchip.com/support.
DOCUMENT REVISION HISTORY
Revision A (February 2020)
• Initial release of this document.
DS50002932A-page 8 2020 Microchip Technology Inc.
Chapter 1. Product Overview
1.1 INTRODUCTION
This chapter provides an overview of the MCP1012 1W Demonstration Board and
covers the following topics:
• MCP1012 Short Overview(1)
• MCP1012 1W Demonstration Board Description
• Contents of the MCP1012 1W Demonstration Board Kit
MCP1012
1W DEMONSTRATION BOARD
USER’S GUIDE
1.2 MCP1012 SHORT OVERVIEW
1.2.1 Features
• High Voltage Start-Up (rated 500V/700V)
• Internal Open-Loop, Peak Current Mode, Current Regulator for Start-Up
• Current Regulator Constant 21.0 µs OFF Time
• Programmable Low Frequency Oscillator (LFO) Period
• Cycle-by-Cycle Current Limiting
• Protection against Continuous Conduction Mode (CCM) of Operation
• Able to Accept External PWM Commands from a Secondary-Side Controller via
Isolator (Optocoupler or Pulse Transformer)
• Undervoltage Lockout (UVLO) and Overvoltage Lockout (OVLO) Protections
• Sleep and Wake-Up Commands
• Robust Gate Driver, able to drive 2.2 nF Load at 65 kHz
• Overtemperature Protection (Thermal Shutdown)
• Package: 7-Lead SOIC
• Environmentally Friendly, EU RoHS Compliant, Pb-Free
1.2.2 Description
The MCP1012 is used as a primary-side start-up IC for starting an off-line Switch Mode
Power Converter, exemplified in this user’s guide and the data sheet by a Flyback
converter.
(1)
The primary functions of the MCP1012 are:
• Starting-Up the Flyback Converter using an Internal Open-Loop, Peak Current
Mode, Current Regulator
• Accepting PWM commands via optocoupler or pulse transformer from a
Secondary-Side Controller
• Providing undervoltage (UVLO) and overvoltage (OVLO) protection
• Peak cycle-by-cycle current limiting when either under control of its internal
current regulator or under control of the Secondary-Side Controller
• Overtemperature protection
Note 1: More detailed information regarding the capabilities of the MCP1012 is
available in the data sheet.
2020 Microchip Technology Inc. DS50002932A-page 9
MCP1012 1W Demonstration Board User’s Guide
AC LINE
INTERFACE
GNDLFO
V
DD
V
IN
GATE
C/S
PULSE
MCP1012
C2
D1
D2
D3
T1
Q1
C3
R1
R2
C4
SERIES
REGULATOR
C1
LOAD
FIGURE 1-1: MCP1012 Typical Application — in an Open Loop Flyback Topology.
1.3 MCP1012 1W DEMONSTRATION BOARD DESCRIPTION
The MCP1012 1W Demonstration Board is used to evaluate and demonstrate
Microchip Technology’s MCP1012 product. This board demonstrates the capabilities of
the MCP1012 in a Flyback converter application supplied from an external voltage
source (120V–500V), with regulated output.
DS50002932A-page 10 2020 Microchip Technology Inc.
FIGURE 1-2: MCP1012 1W Demonstration Board Top View.
Product Overview
1.4 CONTENTS OF THE MCP1012 1W DEMONSTRATION BOARD KIT
The MCP1012 1W Demonstration Board kit includes:
• MCP1012 1W Demonstration Board (DT100118)
• Isolated Jumper JP1 (Mechanical hardware jumper 6.35 mm 1x2 D3087-98)
• Important Information Sheet
2020 Microchip Technology Inc. DS50002932A-page 11
MCP1012 1W Demonstration Board User’s Guide
NOTES:
DS50002932A-page 12 2020 Microchip Technology Inc.
Chapter 2. Installation and Operation
2.1 GETTING STARTED
In order to use and evaluate the capabilities of the MCP1012, several hardware tools
are required and several guidelines will be followed.
2.1.1 Required Hardware Tools
• MCP1012 1W Demonstration Board (DT100118)
• 120–500 VDC, min. 0.5A DC HV power supply
• 15.0 VDC, min. 0.5A DC power supply
• 5.0 VDC, min. 100 mA DC power supply (only for Sleep/Wake-Up functions
testing)
• DC Voltmeter
• Jumpers (2.54 mm)
• Oscilloscope (optional)
• Signal Generator (optional)
MCP1012
1W DEMONSTRATION BOARD
USER’S GUIDE
2.1.2 Recommendations before Starting the Setup Process
• Place the MCP1012 1W Demonstration Board on a non-conductive surface
when connected to the DC power supplies.
• Do not come into contact with the demonstration board while it is connected to
the DC HV power supply.
• Disconnect the demonstration board from the DC power supplies before
performing any work on the MCP1012 1W Demonstration Board.
• Connect instruments that have earth-referenced inputs (such as most
oscilloscopes) only if the galvanic separation is present against the AC mains, or
use a 1:1 transformer for supplying the demonstration board.
Failure to adhere to these guidelines may result in damage to the demo unit, the tests
instruments, and/or can put in danger the person conducting the tests.
2.2 SETUP PROCEDURE
The functionality of the MCP1012 1W Demonstration Board can be evaluated through
seven different setups, which are described in the following chapters.
2020 Microchip Technology Inc. DS50002932A-page 13
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