MCP16331
High-Voltage Input
Buck Converter
Evaluation Board
User’s Guide
2014 Microchip Technology Inc.
DS50002264A
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ISBN:
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CERTIFIED BY DNV
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DS50002264A-page 2
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2014 Microchip Technology Inc.
Object of Declaration: MCP16331 High-Voltage Input Buck Converter Evaluation Board
2014 Microchip Technology Inc.
DS50002264A-page 3
MCP16331 High-Voltage Input Buck Converter Evaluation Board User’s Guide
NOTES:
DS50002264A-page 4
2014 Microchip Technology Inc.
MCP16331 HIGH-VOLTAGE INPUT
BUCK CONVERTER 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 ..................................................................................... 11
1.1 Introduction ................................................................................................... 11
1.2 MCP16331 Short Overview .......................................................................... 11
1.3 What is the MCP16331 High-Voltage Input Buck Converter
Evaluation Board? .................................................................................. 12
1.4 What the MCP16331 High-Voltage Input Buck Converter
Evaluation Board Contains .................................................................... 12
Chapter 2. Installation and Operation ....................................................................... 13
2.1 Introduction ................................................................................................... 13
2.2 Features ....................................................................................................... 13
2.3 Getting Started .............................................................................................. 14
Appendix A. Schematic and Layouts ........................................................................ 17
A.1 Introduction .................................................................................................. 17
A.2 Board – Schematic ....................................................................................... 18
A.3 Board – Top Silk .......................................................................................... 19
A.4 Board – Top Silk And Copper ...................................................................... 20
A.5 Board – Bottom Copper ............................................................................... 21
A.6 Board – Bottom Copper and Silk ................................................................. 22
Appendix B. Bill of Materials (BOM) .......................................................................... 23
Worldwide Sales and Service .................................................................................... 24
2014 Microchip Technology Inc.
DS50002264A-page 5
MCP16331 High-Voltage Input Buck Converter Evaluation Board User’s Guide
NOTES:
DS50002264A-page 6
2014 Microchip Technology Inc.
MCP16331 HIGH-VOLTAGE INPUT
BUCK CONVERTER 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
“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 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
MCP16331 High-Voltage Input Buck Converter 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 MCP16331 High-Voltage Input Buck
Converter Evaluation Board as a development tool. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP16331
High-Voltage Input Buck Converter Evaluation Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with this user’s guide and a description of the user’s guide.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP16331 High-Voltage Input Buck Converter Evaluation
Board.
• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the
MCP16331 High-Voltage Input Buck Converter Evaluation Board.
2014 Microchip Technology Inc.
DS50002264A-page 7
MCP16331 High-Voltage Input Buck Converter 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
DS50002264A-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)
{ ...
}
2014 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use MCP16331 High-Voltage Input Buck Converter
Evaluation Board. Another useful document is listed below. The following Microchip
document is available and recommended as a supplemental reference resource:
• MCP16331 Data Sheet - “High-Voltage Input Integrated Switch Step-Down
Regulator” (DS2005308)
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 (June 2014)
• Initial Release of this Document.
2014 Microchip Technology Inc.
DS50002264A-page 9
MCP16331 High-Voltage Input Buck Converter Evaluation Board User’s Guide
NOTES:
DS50002264A-page 10
2014 Microchip Technology Inc.
MCP16331 HIGH-VOLTAGE INPUT
BUCK CONVERTER EVALUATION
BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP16331 High-Voltage Input Buck Converter Evaluation Board and covers the following topics:
• MCP16331 Short Overview
• What is the MCP16331 High-Voltage Input Buck Converter Evaluation Board?
• What the MCP16331 High-Voltage Input Buck Converter Evaluation Board Contains
1.2
MCP16331 SHORT OVERVIEW
The MCP16331 is a compact, high-voltage, high-efficiency, fixed-frequency, step-down
DC-DC converter. The integrated features include a high-side switch, fixed frequency,
internal compensation, and overtemperature protection. To deliver a fast response to
sudden line and load changes, the MCP16331 uses a high performance peak-current
mode control system. This product provides an easy-to-use power supply solution, with
a minimum number of external components.
The key features of the MCP16331include:
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Up to 94% Typical Efficiency
Input Voltage Range: 4.2V to 50V
Adjustable Output Voltage Range: 2.0V to 24V
2% Output Voltage Accuracy
Integrated N-Channel Buck Switch: 600 m
500 mA Output Current
500 kHz Fixed Frequency
Low Device Shutdown Current
Peak Current Mode Control
Internal Compensation
Internal Soft-Start
Internal Pull-Up on the EN pin
Cycle-by-Cycle Peak Current Limit
Undervoltage Lockout (UVLO): 4.1V to Start, 3.5V to Stop
Overtemperature Protection: 160°C Thermal Shutdown, with 30°C Hysteresis
Available Packages: 6-Lead SOT-23, 8-Lead 2x3 TDFN
The goal of the MCP16331 High-Voltage Input Buck Converter Evaluation Board is to
demonstrate the features of the MCP16331.
2014 Microchip Technology Inc.
DS50002264A-page 11
MCP16331 High-Voltage Input Buck Converter Evaluation Board User’s Guide
1N4148
CBOOST
VIN
4.5V To 50V
BOOST
100 nF L
VIN
100V
Schottky
Diode
CIN
2X10 µF
100V
VOUT
SW
EN
COUT
2X10 µF
RT
(See Equation 2-1)
VFB
GND
RB
10 k
.
FIGURE 1-1:
1.3
Typical MCP16331 Buck Converter.
WHAT IS THE MCP16331 HIGH-VOLTAGE INPUT BUCK CONVERTER
EVALUATION BOARD?
The MCP16331 High-Voltage Input Buck Converter Evaluation Board is used to
evaluate and demonstrate Microchip Technology’s MCP16331 product. This board
demonstrates the MCP16331 in a buck-converter application with two selectable
output voltages. It can be used to evaluate the SOT-23 package. Test points are
provided for the input and output, allowing the board to be connected directly to a
system. Also, additional test points are provided to access the EN pin, in order to
modify the state of the converter, and also access the SW pin, in order to see the
switching waveform.The MCP16331 High-Voltage Input Buck Converter Evaluation
Board was developed to help engineers reduce product design cycle time.
Two common output voltages can be selected, 3.3V and 5.0V.
1.4
WHAT THE MCP16331 HIGH-VOLTAGE INPUT BUCK CONVERTER
EVALUATION BOARD CONTAINS
This MCP16331 High-Voltage Input Buck Converter Evaluation Board kit includes:
• MCP16331 High-Voltage Input Buck Converter Evaluation Board (ADM00519)
• Important Information Sheet
DS50002264A-page 12
2014 Microchip Technology Inc.
MCP16331 HIGH-VOLTAGE BUCK
CONVERTER EVALUATION BOARD
USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP16331 is a compact, high-efficiency, fixed-frequency, step-down DC-DC
converter and has been developed to provide high-input voltage applications with a
precise low voltage regulated rail.
The MCP16331 is capable of regulating the output voltage over a wide 2V to 24V range
from an input rail of up to 50V and typically can deliver over 500 mA. The regulated
output voltage, VOUT, should be lower than the input voltage, VIN,in order to ensure
proper operation.
1N4148
CBOOST L
100 nF 15 µH
BOOST
VIN
GND
+
_
VIN
CIN
2 X10 µF
EN
GND
2.2
+ VOUT
COUT
2 X10 µF
100V
Schottky
Diode
VFB
FIGURE 2-1:
VOUT
1
SW
1
1
RS
0
RT1
52.3 k
RT2
80.6 k
1
+ GND
RB
10 k
MCP16331 Evaluation Board Application.
FEATURES
The MCP16331 Buck Converter Evaluation Board has the following features:
•
•
•
•
•
•
•
•
Input voltage range, VIN: 6V to 50V
Converter can be turned on/off by using a jumper on the EN/GND connector
Fixed output voltage: 3.3V and 5.0V selectable trough a switch
Output current: typical 500 mA
PWM Switching Frequency = 500 kHz
Internal compensation
Internal soft-start
Overtemperature protection (if the die temperature exceeds 150°C, 25°C
hysteresis)
2014 Microchip Technology Inc.
DS50002264A-page 13
MCP16331 High-Voltage Buck Converter Evaluation Board User’s Guide
2.3
GETTING STARTED
The MCP16331 Buck Converter Evaluation Board is fully assembled and tested to
evaluate and demonstrate the MCP16331 product. Before testing the MCP16331 Buck
Converter Evaluation Board, it is recommended that the MCP16331 data sheet is read
and all the limits for input voltage, output voltage and maximum current are taken into
consideration.
2.3.1
Power Input and Output Connection
2.3.1.1
BOARD POWER UP PROCEDURE:
1. Connect system load to VOUT and GND terminals; maximum load varies with
input and output voltage; see the MCP16331 data sheet for more information on
the maximum load.
2. Connect the Power Supply to the VIN and GND terminals. Because the EN is
internally pulled up, the converter will start once power is applied on the input. To
turn off the device, a jumper can be used on the EN/GND connector.
3. The measured output voltage should be 3.3V/5V. Adjusting the input voltage and
load should not cause the output to vary more than a few mV over the operating
range of the converter.
4. The output voltage can be changed from 3.3V to 5V by using the VOUT SEL
switch on the board.
V-Meter
V-Meter
Power
Supply
Power
Supply
FIGURE 2-2:
DS50002264A-page 14
Resistive
Resistive Load
Load
MCP16331 Evaluation Board Setup.
2014 Microchip Technology Inc.
Installation and Operation
2.3.1.2
ADJUSTABLE VOUT SETTING
The resistor divider RT and RB is used to set the converter output voltage. For a specific
output voltage, the top resistor can be calculated as in Equation 2-1. A good trade-off
between noise and quiescent current is to use a 10 k resistor for the bottom resistor.
EQUATION 2-1:
VOUT
R T = R B ------------- – 1
V FB
Where: VFB = 0.8V
When changing the value of the feedback resistor, the VOUT SEL switch will not have
the same functionality, as it will add an additional resistor in parallel with the top resistor.
Additionally, when modifying the output voltage, the inductor value must be modified in
order to get the best results in terms of efficiency and load and line step responses. For
typical output voltage, see Table 2-1 for the recommended inductor values.
TABLE 2-1:
RECOMMENDED INDUCTOR VALUES
VOUT
Inductor Value
2.0V
10 µH
3.3V
15 µH
5.0V
22 µH
12V
56 µH
15V
68 µH
24V
100 µH
Because the MCP16331 integrates the high-side N-Channel MOSFET, a high-side
driver is needed to supply the drive for the gate of the MOSFET above the input voltage
in order to turn it on. For the MCP16331 Buck Converter Evaluation Board, the output
voltage is used to charge the boost capacitor. For output voltages above 5V, the voltage
used to charge the boost capacitor needs to be clamped to less then 5V to avoid
damaging the part. An easy way to achieve this is to remove the resistor (R1) in series
with the bootstrap diode and add a Zener diode of appropriate voltage. For more information, refer to the MCP16331 Data Sheet.
2014 Microchip Technology Inc.
DS50002264A-page 15
MCP16331 High-Voltage Buck Converter Evaluation Board User’s Guide
NOTES:
DS50002264A-page 16
2014 Microchip Technology Inc.
MCP16331 HIGH-VOLTAGE INPUT
BUCK CONVERTER EVALUATION
BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP16331 Buck
Converter Evaluation Board:
•
•
•
•
Board – Schematic
Board – Top Silk
Board – Top Silk And Copper
Board – Bottom Copper
2014 Microchip Technology Inc.
DS50002264A-page 17
2014 Microchip Technology Inc.
A.2
BOARD – SCHEMATIC
D1
R1
0
1N4148WS
C1
VIN
0.1uF
5
J5
4
HDR M 1x2 VERT
VIN
EN
U1
SW
TP1
SW
J2
L1
6
1
10uF
2220
2 1
10uF
2220
C3
2
C2
GND BOOST
1
1
J1
15uH
RT1
52.3k
VFB
RT2
80.6k
C4
3
SW1
MCP16331
10uF
1210
VOUT
C5
10uF
1210
MBRS1100T3G
J3
J4
1
1
RB
10k
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
DS50002264A-page 18
Schematic and Layouts
D2
Schematic and Layouts
A.3
BOARD – TOP SILK
2014 Microchip Technology Inc.
DS50002264A-page 19
MCP16331 High-Voltage Input Buck Converter Evaluation Board User’s Guide
A.4
BOARD – TOP SILK AND COPPER
DS50002264A-page 20
2014 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – BOTTOM COPPER
2014 Microchip Technology Inc.
DS50002264A-page 21
MCP16331 High-Voltage Input Buck Converter Evaluation Board User’s Guide
NOTES:
DS50002264A-page 22
2014 Microchip Technology Inc.
MCP16331 HIGH-VOLTAGE INPUT
BUCK CONVERTER EVALUATION
BOARD USER’S GUIDE
Appendix B. Bill of Materials (BOM)
TABLE B-1:
BILL OF MATERIALS (BOM)
Qty. Reference
Description
Manufacturer
Part Number
1
C1
Cap. ceramic 0.1 µF 50V X7R 10% 0603 TDK Corporation
C1608X7R1H104K
2
C2,C3
Cap. ceramic 10 µF 100V X7S 2220
TDK Corporation
C5750X7S2A106M230KB
2
C4, C5
Cap. ceramic 10 µF 50V X7S 1210
TDK Corporation
C3225X7S1H106M
1
D1
Diode switch 75V 150 mA SOD323
Micro Commercial
Components Corp.
1N4148WX-TP
1
D2
Diode Schottky 100V 1A SMB
ON Semiconductor®
MBRS1100T3G
4
J1, J2, J3, J4 PC test point tin SMD
Harwin Plc.
S1751-46R
1
L1
Choke, SMD, 15 µH
Wurth Elektronik Group
7447779115
1
R1
Res. 0.0 1/4W jump 1206 SMD
Panasonic®
1
RB
Res. 10 k 1/10W 1% 0603 SMD
Panasonic ECG
1
REN
Res. 1 M 1/10W 1% 0603 SMD
Panasonic ECG
ERJ-3EKF1004V
1
RT1
Res. 52.3 k 1/10W 1% 0603 SMD
Panasonic ECG
ERA-3AEB5232V
1
RT2
Res. 80.6 k 1/10W 1% 0603 SMD
Panasonic ECG
ERJ-3EKF80R6V
2
SW1, SW2
2.54 mm SW_SMD_DIP
Wurth® Group
418121270801
1
U1
High-Voltage Input Buck Converter
Microchip Technology
Inc.
MCP16331T-E/CH
Note 1:
ECG
ERJ-8GEY0R00V
ERJ-3EKF1002V
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.
2014 Microchip Technology Inc.
DS50002264A-page 23
Worldwide Sales and Service
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Fax: 905-673-6509
DS50002264A-page 24
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Fax: 86-23-8980-9500
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Tel: 86-571-8792-8115
Fax: 86-571-8792-8116
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Tel: 852-2943-5100
Fax: 852-2401-3431
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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 - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
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
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Germany - Dusseldorf
Tel: 49-2129-3766400
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Germany - Pforzheim
Tel: 49-7231-424750
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Italy - Venice
Tel: 39-049-7625286
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
Poland - Warsaw
Tel: 48-22-3325737
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
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
Sweden - Stockholm
Tel: 46-8-5090-4654
UK - Wokingham
Tel: 44-118-921-5800
Fax: 44-118-921-5820
Taiwan - Kaohsiung
Tel: 886-7-213-7830
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
03/25/14
2014 Microchip Technology Inc.