MCP1643 Synchronous Boost
LED Constant Current Regulator
Evaluation Board
User’s Guide
2013 Microchip Technology Inc.
DS20005196A
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ISBN: 978-1-62077-403-8
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CERTIFIED BY DNV
== ISO/TS 16949 ==
DS20005196A-page 2
Microchip received ISO/TS-16949:2009 certification for its worldwide
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2013 Microchip Technology Inc.
Object of Declaration: MCP1643 Synchronous Boost LED Constant Current Regulator
Evaluation Board User’s Guide
2013 Microchip Technology Inc.
DS20005196A-page 3
MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board User’s Guide
NOTES:
DS20005196A-page 4
2013 Microchip Technology Inc.
MCP1643 SYNCHRONOUS BOOST LED
CONSTANT CURRENT REGULATOR
EVALUATION BOARD USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 7
Introduction............................................................................................................ 7
Document Layout .................................................................................................. 7
Conventions Used in this Guide ............................................................................ 8
Recommended Reading........................................................................................ 9
The Microchip Web Site ........................................................................................ 9
Customer Support ................................................................................................. 9
Document Revision History ................................................................................... 9
Chapter 1. Product Overview
1.1 Introduction ................................................................................................... 11
1.2 MCP1643 Short Overview ............................................................................ 11
1.3 What is the MCP1643 Synchronous Boost LED Constant Current Regulator
Evaluation Board? .................................................................................. 12
1.4 MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation
Board Kit Contents ................................................................................. 12
Chapter 2. Installation and Operation
2.1 Introduction ................................................................................................... 13
2.2 Getting Started ............................................................................................. 14
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 17
A.2 Board – Schematic ....................................................................................... 18
A.3 Board – Top Silk and Pads .......................................................................... 19
A.4 Board – Top Copper ................................................................................... 19
A.5 Board – Bottom Copper ............................................................................... 19
Appendix B. Bill of Materials ............................................................................................... 21
Worldwide Sales and Service .................................................................................... 22
2013 Microchip Technology Inc.
DS20005196A-page 5
MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board User’s Guide
NOTES:
DS20005196A-page 6
2013 Microchip Technology Inc.
MCP1643 SYNCHRONOUS BOOST LED
CONSTANT CURRENT REGULATOR
EVALUATION BOARD USER’S GUIDE
Preface
NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and
documentation are constantly evolving to meet customer needs, so some actual dialogs
and/or tool descriptions may differ from those in this document. Please refer to our web site
(www.microchip.com) to obtain the latest documentation available.
Documents are identified with a “DS” number. This number is located on the bottom of each
page, in front of the page number. The numbering convention for the DS number is
“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the
document.
For the most up-to-date information on development tools, see the MPLAB® IDE online help.
Select the Help menu, and then Topics to open a list of available online help files.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board.
Items discussed in this chapter include:
•
•
•
•
•
•
Document Layout
Conventions Used in this Guide
Recommended Reading
The Microchip Web Site
Customer Support
Document Revision History
DOCUMENT LAYOUT
This document describes how to use the MCP1643 Synchronous Boost LED Constant
Current Regulator Evaluation Board. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP1643
Synchronous Boost LED Constant Current Regulator Evaluation Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with the MCP1643 Synchronous Boost LED Constant Current Regulator
Evaluation Board and a description of the user’s guide.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP1643 Synchronous Boost LED Constant Current Regulator
Evaluation Board.
• Appendix B. “Bill of Materials” – Lists the parts used to build the MCP1643
Synchronous Boost LED Constant Current Regulator Evaluation Board.
2013 Microchip Technology Inc.
DS20005196A-page 7
MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
N‘Rnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents
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 brackets and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
Represents code supplied by
user
DS20005196A-page 8
Examples
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)
{ ...
}
2013 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use MCP1643 Synchronous Boost LED Constant
Current Regulator Evaluation Board. Other useful documents are listed below. The
following Microchip documents are available and recommended as supplemental
reference resources.
• MCP1643 Data Sheet - “1 MHz Low Voltage Start-up Synchronous Boost
LED Constant Current Regulator” (DS20005208)
• AN1311 - “Single Cell Input Boost Converter Design” (DS01311)
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
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://www.microchip.com/support.
DOCUMENT REVISION HISTORY
Revision A (August 2013)
• Initial Release of this Document.
2013 Microchip Technology Inc.
DS20005196A-page 9
MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board User’s Guide
NOTES:
DS20005196A-page 10
2013 Microchip Technology Inc.
MCP1643 SYNCHRONOUS BOOST LED
CONSTANT CURRENT REGULATOR
EVALUATION BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP1643 Synchronous Boost LED Constant
Current Regulator Evaluation Board and covers the following topics:
• MCP1643 Short Overview
• What is the MCP1643 Synchronous Boost LED Constant Current Regulator
Evaluation Board?
• MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board
Kit Contents
1.2
MCP1643 SHORT OVERVIEW
The MCP1643 is a compact, high-efficiency, fixed frequency, step-up DC-DC converter
optimized as an LED constant current generator. This product provides an easy-to-use
power supply solution, with a minimum number of external components for applications
powered by one-cell, two-cell Alkaline, NiCd or NiMH batteries.
The MCP1643 is a PWM-only device that operates at a fixed 1 MHz switching
frequency. The device has an operating input voltage range from 0.5V to 5V (with a
0.65V start-up voltage).
The LED can be turned ON and OFF with a variable duty cycle applied to the EN pin
for applications that require dimming. The maximum dimming frequency is only limited
by the internal soft-start of 240 µs.
The device is available in MSOP-8 and 2X3 TDFN-8 packages.
The scope of the MCP1643 Synchronous Boost LED Constant Current Regulator
Evaluation Board is to demonstrate the LED driving capabilities of the MCP1643 when
supplied from one AA battery.
L1
4.7 µH
0.12V
ILED=
CIN
4.7...10 µF
SW
VOUT
VIN
+
RSET
ILED=25 mA
LED
COUT
4.7...20 µF
ALKALINE
MCP1643
VFB
RSET
4.7
EN
-
GND
ON
OFF
FIGURE 1-1:
2013 Microchip Technology Inc.
Typical MCP1643 Boost Converter Single Cell Battery Input.
DS20005196A-page 11
MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board User’s Guide
1.3
WHAT IS THE MCP1643 SYNCHRONOUS BOOST LED CONSTANT
CURRENT REGULATOR EVALUATION BOARD?
The MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board
is used to evaluate and demonstrate Microchip Technology’s MCP1643 device. This
board demonstrates the MCP1643 in a boost converter application supplied by one AA
battery, or from an external voltage source, which drives an LED with four selectable
currents. The MCP1643 Synchronous Boost LED Constant Current Regulator
Evaluation Board was developed to help engineers reduce the product design cycle
time.
Four output currents can be selected: 25,50,75 and 100mA. The output current can be
changed with a dual switch that changes the external LED current sense equivalent
resistance (for the position of the switches and output current see Table 2-1.)
An enable switch is used to enable and disable the converter. When enabled, the
MCP1643 will regulate the output current; when disabled, the MCP1643 disconnects
the path from input to output for “true-disconnect”. In this state, the current consumed
from the battery is 1.2 µA, typically.
1.4
MCP1643 SYNCHRONOUS BOOST LED CONSTANT CURRENT
REGULATOR EVALUATION BOARD KIT CONTENTS
This MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board
kit includes the following items:
• MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board
(ADM00435)
• Important Information Sheet
DS20005196A-page 12
2013 Microchip Technology Inc.
MCP1643 SYNCHRONOUS BOOST LED
CONSTANT CURRENT REGULATOR
EVALUATION BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP1643 has been developed for applications that require driving an LED from a
low-voltage source. The Microchip low-voltage technology allows the device to start up
from a low 0.65V input voltage without output overshoot. At the same time, the device
is capable of achieving high efficiency by integrating the low resistance N-Channel
Boost switch and the synchronous P-Channel switch and by using a low voltage reference (0.120V) to reduce the power dissipation on the sensing resistor. Another important feature is that the device integrates the compensation and protection circuitry, so
that the final solution will require a minimum number of additional components.
When disabled using the EN switch, the true disconnect option removes the normal
boost topology path from input to output.
L1
4.7 µH
CIN
10 µF
SW
VOUT
VIN
+
ALKALINE
FIGURE 2-1:
2 X 10 µF
VFB
EN
REN
1M
COUT
MCP1643
EN
-
LED
GND
RSET0
4.7
RSET1
4.7
RSET2
2.4
Synchronous Boost 25, 50, 75, 100 mA Constant Current Application.
2.1.1
MCP1643 Evaluation Board Features
The MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board
has the following features:
• It can be powered by one-cell Alkaline, NiCd, or NiMH batteries, or by external
power supply
• Input voltage range, VIN: 0.5V to 2.5V, with VIN VOUT, after start-up
• Start-up voltage: 0.65V
• Fixed output current: 25 mA, 50 mA, 75 mA or 100 mA, selected using a mini-dip
switch on board
• PWM Switching Frequency: 1 MHz
• Enable state selectable using mini-dip switch on board
• 1.6A Peak Input Current Limit
• Overtemperature Protection (if the die temperature exceeds 150°C, 25°C hysteresis)
• Mechanical battery reverse polarity protection
Note:
2013 Microchip Technology Inc.
For VIN < VOUT, ILED remains in regulation up to VIN = VLED @ LED typical
VF and IF.
DS20005196A-page 13
MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board User’s Guide
2.2
GETTING STARTED
The MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board
is fully assembled and tested to evaluate and demonstrate the MCP1643 product. This
board requires the use of an external power supply or an AA battery.
2.2.1
Power Input and Output Connection
2.2.1.1
POWERING THE MCP1643 SYNCHRONOUS BOOST LED CONSTANT
CURRENT REGULATOR EVALUATION BOARD
Soldered test points are available for input voltage connections. The maximum input
voltage should not exceed 2.5V. The output current will not remain in regulation for
input voltages that are greater than, or equal to, the forward voltage of the LED. White
LEDs have VF typical between 2.5 and 3.5V, depending on the LED drive current.
The MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board
was designed to be used in the process of validating the device. The package selected
for the MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation
Board is the MSOP-8.
SW1 is the Enable switch, which gives the state of the converter, ON or OFF. A soldered test point that can be used for PWM dimming is also available for the EN pin. The
second switch is used to modify the value of the sense resistor, in order to modify the
LED current and achieve analog dimming (for the position of the switches and output
current, see Table 2-1).
2.2.1.2
BOARD POWER UP PROCEDURE
1. Connect the input supply as shown in Figure 2-2 or connect an AA battery in the
battery holder on the bottom of the board.
2. Use SW1 to change the state of the converter from ON to OFF.
3. Change the value of the output current using SW2. There are four available
currents: 25 mA, 50 mA,75 mA and 100 mA.
Additional test points are available to visualize different signals (SW, output current,
FB) or to modify the output current by dimming, using the EN pin. Note: Due to the
holder reverse polarity protection, the battery can only be inserted in the correct
position.
+
_
Power Supply
FIGURE 2-2:
MCP1643 Synchronous Boost LED Constant Current Regulator
Evaluation Board Setup.
DS20005196A-page 14
2013 Microchip Technology Inc.
Installation and Operation
2.2.1.3
ADJUSTABLE LED CURRENT SETTING BY RECALCULATING THE
SENSE RESISTOR
The Sense Resistor is used to modify the value of the output current. The value for the
sense resistor can be calculated using the following equation:
R2 = VFB/ILED
Where: VFB = 0.120V
TABLE 2-1:
LED CURRENT SELECTION
Switch Position
LED Current
ON
25 mA
1
2
ON
50 mA
2
1
ON
75 mA
1
2
ON
100 mA
1
Note:
2.2.1.4
2
If the sense resistor is recalculated, the switch used for current selection will
not be used, as it will add a resistor in parallel with the calculated
component. When recalculating the sense resistor, check the Maximum
Limits for ILED in the Regulation graph available in the data-sheet.
ADJUSTABLE LED CURRENT SETTING BY USING THE EN PIN (PWM
DIMMING)
The MCP1643 allows PWM dimming by turning the LED ON or OFF with a variable
duty cycle PWM signal applied to the EN pin. The maximum frequency for dimming is
limited by the internal soft-start of 240 µs typical. By varying the duty cycle of the PWM
signal applied on EN input, the LED current is changing linearly and the light intensity
changes as well.
A 0Ω R1 resistor is used for bench testing. By removing R1, the soldered test points
can be used to either insert a multimeter to measure the LED current, or create a loop
and visualize the current through the LED by using an oscilloscope current probe.
2013 Microchip Technology Inc.
DS20005196A-page 15
MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board User’s Guide
NOTES:
DS20005196A-page 16
2013 Microchip Technology Inc.
MCP1643 SYNCHRONOUS BOOST LED
CONSTANT CURRENT REGULATOR
EVALUATION BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP1643
Synchronous Boost LED Constant Current Regulator Evaluation Board:
•
•
•
•
Board – Schematic
Board – Top Silk and Pads
Board – Top Copper
Board – Bottom Copper
2013 Microchip Technology Inc.
DS20005196A-page 17
DS20005196A-page 18
GND
R4
2.4
GND
R3
4.7
0
R2
4.7
GND
SW2B
2
1
R1
GND
C1
C2
10uF 10uF
DNP
GND
J2
1
5
SW
VIN
8
GND
6 7
EN 1
VFB
3
NC
PGND SGND
VOUT
TP2
2
4
L1
GND
R6
1M
1
J7
SW1
MSOP-8
SW_SMD_DIP
MCP1643
4.7uH/1.35A
U1
GND
C3
10uF
0805
2
1
-
+
1 J6
1 J4
BT1
Battery Holder
1 J3
1 J5
AA
BAT1
A.2
SW2A
LD1
SW_SMD_DIP
J1
1
TP1
MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board User’s Guide
BOARD – SCHEMATIC
2013 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP SILK AND PADS
A.4
BOARD – TOP COPPER
A.5
BOARD – BOTTOM COPPER
2013 Microchip Technology Inc.
DS20005196A-page 19
MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board User’s Guide
NOTES:
DS20005196A-page 20
2013 Microchip Technology Inc.
MCP1643 SYNCHRONOUS BOOST LED
CONSTANT CURRENT REGULATOR
EVALUATION BOARD USER’S GUIDE
Appendix B. Bill of Materials
TABLE B-1:
BILL OF MATERIALS (BOM)
Qty. Reference
1
BT1
2
C1, C3
7
Description
Manufacturer
Part Number
Holder Battery AA Polar Protection
MPD (Memory Protec- BHAA-POL
tion Devices)/Keystone
Cap. Ceramic 10 UF 10V 10% X7R 0805
Murata Electronics®
North America
GRM21BR71A106KE51L
Harwin Plc.
S1751-46R
J1, J2, J3, PC Test Point Tin SMD
J4, J5, J6,
J7
1
L1
Choke, TPC 2828, 4.7UH 20% 1.35A
Wurth Elektronik Group 744025004
1
LD1
LED, Hi Bright, 51.7LM, Warm White
Cree, Inc.
MLEAWT-A1-R250-0004E5
1
R1
Resistor, 1206 0R0
Welwyn Components
WCR1206-R005JI
3
R4
Resistor, 0805, 2R4 5%, 0.125W
Panasonic - ECG
ERJ-6RQF2R4V
1
R6
Resistor, 1M Ohm 1/10W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF1004V
1
SW1
2.54 mm SW_SMD_DIP
Wurth Elektronik Group 418121270801
1
SW2
2
R2, R3
1
U1
1
BAT1
1
C2
Note 1:
1.27 mm SW_SMD_DIP
Wurth Elektronik Group 416131160802
Resistor, 0805, 4R7 5%, 0.125W
Panasonic - ECG
ERJ-B3BF4R7V-ND
LED Driver, Boost Converter
Microchip Technology
Inc.
MCP1643-I/MS
Battery Lithium AA Cell 1.5 Volt
Energizer Battery
Company
L91
Cap. Ceramic 10uF 10V 10% X7R 0805 DO NOT POPULATE
Murata Electronics®
North America
GRM21BR71A106KE51L
The components listed in this Bill of Materials are representative of the PCB assembly. The
released BOM used in manufacturing uses all RoHS-compliant components.
2013 Microchip Technology Inc.
DS20005196A-page 21
Worldwide Sales and Service
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China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
China - Chongqing
Tel: 86-23-8980-9588
Fax: 86-23-8980-9500
China - Hangzhou
Tel: 86-571-2819-3187
Fax: 86-571-2819-3189
China - Hong Kong SAR
Tel: 852-2943-5100
Fax: 852-2401-3431
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
China - Shenzhen
Tel: 86-755-8864-2200
Fax: 86-755-8203-1760
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
India - Pune
Tel: 91-20-3019-1500
Japan - Osaka
Tel: 81-6-6152-7160
Fax: 81-6-6152-9310
Japan - Tokyo
Tel: 81-3-6880- 3770
Fax: 81-3-6880-3771
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Taiwan - Hsin Chu
Tel: 886-3-5778-366
Fax: 886-3-5770-955
Taiwan - Kaohsiung
Tel: 886-7-213-7828
Fax: 886-7-330-9305
Taiwan - Taipei
Tel: 886-2-2508-8600
Fax: 886-2-2508-0102
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
China - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
DS20005196A-page 22
India - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
08/20/13
2013 Microchip Technology Inc.