MCP1630 +12V In Dual Output Buck Converter Reference Design (c) 2008 Microchip Technology Inc. DS51531B 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. 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SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. (c) 2008, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received ISO/TS-16949:2002 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(R) MCUs and dsPIC(R) DSCs, KEELOQ(R) 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. DS51531B-page ii (c) 2008 Microchip Technology Inc. MCP1630 DUAL BUCK REFERENCE DESIGN Table of Contents Preface ........................................................................................................................... 1 Chapter 1. Product Overview 1.1 Introduction ..................................................................................................... 5 1.2 What IS the MCP1630 Dual Buck Reference Design? .................................. 6 1.3 What the MCP1630 Dual Buck Reference Design kit includes ...................... 6 Chapter 2. Installation and Operations 2.1 Introduction ..................................................................................................... 7 2.2 Features ......................................................................................................... 7 2.3 Getting Started ............................................................................................... 7 Appendix A. Schematic and Layouts A.1 Introduction and Highlights .......................................................................... 13 A.2 Board - Schematic - Sheet 1 ........................................................................ 14 A.3 Board - SchEmatic - Sheet 2 ....................................................................... 15 A.4 Board - Top Layer ........................................................................................ 16 A.5 Board - Mid-Layer 1 ..................................................................................... 17 A.6 Board - Mid-Layer 2 ..................................................................................... 18 A.7 Board - Bottom Layer ................................................................................... 19 Appendix B. Bill Of Materials (BOM) Appendix C. Evaluation Board Firmware C.1 Device Firmware .......................................................................................... 23 Worldwide Sales and Service .................................................................................... 24 (c) 2008 Microchip Technology Inc. DS51531B-page iii MCP1630 Dual Buck Reference Design NOTES: DS51531B-page iv (c) 2008 Microchip Technology Inc. MCP1630 DUAL BUCK REFERENCE DESIGN 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(R) IDE on-line help. Select the Help menu, and then Topics to open a list of available on-line help files. INTRODUCTION This chapter contains general information that will be useful to know before using the MCP1630 Dual Buck Reference Design. 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 MCP1630 Dual Buck Reference Design as a development tool. The manual layout is as follows: * Chapter 1. "Product Overview" - Important information about the MCP1630 Dual Buck Reference Design. * Chapter 2. "Installation and Operations" - Includes instructions on how to get started with this reference design and a description of the reference design operation. * Appendix A. "Schematic and Layouts" - Shows the schematic and layout diagrams for the MCP1630 Dual Buck Reference Design. * Appendix B. "Bill Of Materials (BOM)" - Lists the parts used to build the MCP1630 Dual Buck Reference Design. * Appendix C. "Evaluation Board Firmware" - Provides information about the application firmware and where the source code can be found. (c) 2008 Microchip Technology Inc. DS51531B-page 1 MCP1630 Dual Buck Reference Design CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions: DOCUMENTATION CONVENTIONS Description Arial font: Italic characters Represents Referenced books Emphasized text A window A dialog A menu selection A field name in a window or dialog A menu path MPLAB(R) 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 #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} 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 code supplied by user DS51531B-page 2 Examples File>Save Press <Enter>, <F1> var_name [, var_name...] void main (void) { ... } (c) 2008 Microchip Technology Inc. Preface RECOMMENDED READING This reference guide describes how to use MCP1630 Dual Buck Reference Design. Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference resources. MCP1630 Data Sheet, "High-Speed, Microcontroller-Adaptable, Pulse Width Modulator", DS21896 MCP1630 NiMH Demo Board User's Guide, DS51505 AN960 - "New Components and Design Methods Bring Intelligence to Battery Charger Applications", DS00960 MCP14628 Data Sheet, "2A Synchronous Buck Power MOSFET Driver", DS22083 MCP1703 Data Sheet, "250 mA, 16V, Low Quiescent Current LDO", DS22049 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://support.microchip.com DOCUMENT REVISION HISTORY Revision B (July 2008) * Changed U2 and U7 to MCP14628; * Changed U4 to MCP1703. Revision A (February 2005) * Inital Release of this Document. (c) 2008 Microchip Technology Inc. DS51531B-page 3 MCP1630 Dual Buck Reference Design NOTES: DS51531B-page 4 (c) 2008 Microchip Technology Inc. MCP1630 DUAL BUCK REFERENCE DESIGN Chapter 1. Product Overview 1.1 INTRODUCTION The MCP1630 Dual Buck Reference Design is used to evaluate the Microchip MCP1630 analog, high-speed Pulse Width Modulator (PWM) used in a dual synchronous, buck regulator, power-converter application. The evaluation board is a complete, stand-alone, dual-output, dc-dc converter with +12V input, adjustable dual output at 20A per output. This chapter also covers the following topics: * What is the MCP1630 Dual Buck Reference Design? * What the MCP1630 Dual Buck Reference Design kit includes. CS 60T +VIN 1T + VOUT1 CS +VCC MCP1630 COMP FB CS OSC LBUCK PWM Synch Gate Drive VOUT1 + COUT1 Temp Sense #1 VREF + - Active-Filter MCP6231 SC-70 Temperature sensor located close to the power switches of each channel PIC16F684 CS MCP1630 COMP FB CS OSC "Bit bang reference" FIGURE 1-1: Temp Sense #2 VOUT2 LBUCK PWM Synch Gate Drive VOUT2 + COUT2 VREF + - Active-Filter MCP6231 SC-70 Dual Buck Converter Block Diagram. (c) 2008 Microchip Technology Inc. DS51531B-page 5 MCP1630 Dual Buck Reference Design 1.2 WHAT IS THE MCP1630 DUAL BUCK REFERENCE DESIGN? The MCP1630 Dual Buck Reference Design is a complete, stand-alone, dual-output power supply capable of 20A per output, powered from a +12V input source. This board utilizes Microchip's MCP1630 (high-speed PIC (R) MCU PWM MSOP8), MCP1703 (LDO SOT-89), PIC16F684 (MCU Flash TSSOP14), MCP6231U (Op Amp SC-70), TC6501 (Temperature Switch SOT23A-5) and MCP14628 (synchronous MOSFET driver SOIC8). The input voltage range for the reference design is +9.0V to +13.5V. Both adjustable regulated outputs are capable of 20A. Input terminals are provided to apply an intput voltage to the power supply. Output terminals are also provided as a way to connect the 20A outputs to a load. 1.3 WHAT THE MCP1630 DUAL BUCK REFERENCE DESIGN KIT INCLUDES This MCP1630 Dual Buck Reference Design Kit includes: * The MCP1630 Dual Buck Reference Design (102-00035) * Analog and Interface Product Demonstration Boards CD-ROM (DS21912) - MCP1630 Dual Buck Reference Design (DS51531) - MCP1630 Data Sheet (DS21896) DS51531B-page 6 (c) 2008 Microchip Technology Inc. MCP1630 DUAL BUCK REFERENCE DESIGN Chapter 2. Installation and Operations 2.1 INTRODUCTION The MCP1630 Dual Buck Reference Design demonstrates Microchip's MCP1630 high-speed PWM, used in an adjustable, dual-output, buck regulator application. The MCP1630 is a high-speed, microcontroller-adaptable, PWM that, when used in conjunction with a microcontroller, will control the power system duty cycle to provide output voltage regulation. The PIC16F684 microcontroller can be used to regulate output voltage or current, switching frequency and setting maximum duty cycle. The MCP1630 generates duty cycle, provides fast overcurrent protection and utilizes variable external inputs. External signals include the input oscillator and the reference voltage. The power train signals include the current sense and the feedback voltage. The output signal is a square-wave pulse. The power train used for the MCP1630 Dual Buck Reference Design is a dual synchronous buck regulator. 2.2 FEATURES The MCP1630 Dual Buck Reference Design has the following features: * * * * * * * * * 2.3 Input Voltage Range: +9.0V to +13.5V Adjustable Output Voltage Capable of Calibration Sequencing or Tracking Outputs Outputs are180 out of phase, each capable of 20A Independent Overcurrent Protection Independent Overtemperature Protection Input Overvoltage and Undervoltage Lockout (UVLO) Power Good Indication (LED) with Adjustable Delay Switching Frequency Dithering GETTING STARTED The MCP1630 Dual Buck Reference Design is fully assembled and tested over its range of input voltage, output voltage and output current. This board requires the use of an external input voltage source (+9.0V to +13.5V) and external load (electronic or resistive). Note: (c) 2008 Microchip Technology Inc. It is recommended that a minimum 300 linear feet per minute of airflow blown directly across the board to cool the power dissipating components when operating above 10A loads. DS51531B-page 7 MCP1630 Dual Buck Reference Design 2.3.1 Power Input and Output Connections Powering the MCP1630 Dual Buck Reference Design. 1. Apply the input voltage to the connector (J3) provided. Connect the positive side of the input source (+) to the test point (J3-1). Connect the negative (or return side (-)) of the input source to the GND terminal (J3-2). J3 is the center two position terminal block located on the left side of the board. A 14-gauge wire size is recommended for evaluating the board at 20A per output. The power supply input voltage must be in the specified operating range for the board to operate. An undervoltage lockout circuit prevents the converter from running when the input voltage is too low. 2. An on/off push-button switch (SW3) is used to turn the converter outputs on and off. During normal power-up, the outputs are turned on by pressing SW3 once. To turn the outputs off, press SW3 again. 3. In the event of a fault, (input voltage out-of-range, output voltage out-of-range or power train overtemperature), both VOUT1 and VOUT2 will shut down, indicated by the D1 power good LED flashing. To restart, the input voltage must be brought to 0V and raised back to the specified input voltage range of the converter prior to pressing the on/off button. A solid D1 power good LED indicates that the regulator outputs are operating properly at their programmed values. Applying the load to the MCP1630 Dual Buck Reference Design. 1. To apply a load to VOUT1 of the MCP1630 Dual Buck Reference Design, the positive side of the VO1 load (+) should be connected to the terminal +VO1 (J2-2). The negative side of the VO1 load should be connected to the terminal GND (J2-1). 2. To apply a load to VOUT2 of the MCP1630 Dual Buck Reference Design, the positive side of the VO2 load (+) should be connected to the terminal +VO2 (J4-2). The negative side of the VO2 load should be connected to the terminal GND (J4-1). 3. Outputs VO1 and VO2 are independent of each other and are loaded separately. Both outputs have independent over current protection, overtemperature and short-circuit protection. Note: 2.3.2 The maximum rated load is 20A per output. When loading the board over 10A, airflow is necessary to prevent the overtemperature protection circuitry from automatically turing off the power train that has the overtemperature condition. Power Present and Power Good Indication 1. The MCP1630 Dual Buck Reference Design has two status LED's. One LED (D3) is used to determine if input voltage is present. 2. The second LED (D1) is used for fault and power good indication. During normal operation, if both regulator outputs are within regulation, D1 is illuminated to provide indication that power is good. If either output is out of regulation, D1 will blink, providing indication that one or both of the outputs are not in regulation. DS51531B-page 8 (c) 2008 Microchip Technology Inc. Installation and Operations 2.3.3 Programming 1. The MCP1630 Dual Buck Reference Design can be programmed to calibrate VOUT1, VOUT2, output sequencing or tracking and switching frequency dithering on or off. 2. To enter the programming mode, apply input voltage within the specified operating range (9V to 13.5V). Press and hold the M (SW1) button. While still holding the M button, press and release the on/off (SW3) button. The flashing rate of LED D1 should increase, indicating Programming mode. 3. Once in Programming mode, the first variable to set is VOUT1. Press the select S button to increase VOUT1. Keep pressing the S button to increase VOUT1 until it wraps around to the minimum setting. Note: The range of VOUT1 is controlled by the value of fixed resistors R34, R35 and R10. The range of VOUT1 is typically from 2.42V (minimum) to 3.39V (maximum). 4. Press M once to select VOUT2. VOUT2 in increased by pressing the S button similar to setting VOUT1. Note: The range of VOUT2 is controlled by the value of fixed resistors R14, R15 and R42. The range of VOUT2 is typically from 1.22V (minimum) to 2.3V (maximum). 5. Press M once to select between output sequencing or tracking. D1 flashing indicates that sequencing is selected. Press M to change from sequencing to tracking, or from tracking to sequencing. 6. Press M once to select between frequency dithering on and frequency dithering off. D1 flashing indicates that frequency dithering is selected. 7. By pressing and holding the M button, the selected settings will be programmed. The next power-up cycle for the converter will return to the programmed settings. B OAR D Mode Select On/Off FIGURE 2-1: (c) 2008 Microchip Technology Inc. Mode, Select and On/Off Switch Location. DS51531B-page 9 MCP1630 Dual Buck Reference Design NOTES: DS51531B-page 10 (c) 2008 Microchip Technology Inc. MCP1630 DUAL BUCK REFERENCE DESIGN Appendix A. Schematic and Layouts A.1 INTRODUCTION AND HIGHLIGHTS This appendix contains the following schematics and layouts for the MCP1630 Dual Buck Reference Design: * * * * * * Board Schematic - Sheet 1 Board Schematic - Sheet 2 Board - Top Layer Board - Mid-Layer 1 Board - Mid-Layer 2 Board - Bottom Layer (c) 2008 Microchip Technology Inc. DS51531B-page 13 MCP1630 Dual Buck Reference Design BOARD SCHEMATIC - SHEET 1 D U3 G G S D S M A.2 DS51531B-page 14 (c) 2008 Microchip Technology Inc. Schematic and Layouts BOARD SCHEMATIC - SHEET 2 (c) 2008 Microchip Technology Inc. S D G G S D M A.3 DS51531B-page 15 MCP1630 Dual Buck Reference Design A.4 BOARD - TOP LAYER BOARD DS51531B-page 16 (c) 2008 Microchip Technology Inc. Schematic and Layouts A.5 BOARD - MID-LAYER 1 BOARD (c) 2008 Microchip Technology Inc. DS51531B-page 17 MCP1630 Dual Buck Reference Design A.6 BOARD - MID-LAYER 2 BOARD MIDLAYER2 DS51531B-page 18 (c) 2008 Microchip Technology Inc. Schematic and Layouts A.7 BOARD - BOTTOM LAYER (c) 2008 Microchip Technology Inc. DS51531B-page 19 MCP1630 Dual Buck Reference Design NOTES: DS51531B-page 20 (c) 2008 Microchip Technology Inc. MCP1630 DUAL BUCK REFERENCE DESIGN Appendix B. Bill Of Materials (BOM) TABLE B-1: Qty 9 BILL OF MATERIALS Reference (BOM) Description Part Number Panasonic - ECG ECJ-1VB1A105K CAP 1500PF 50V CERAMIC NPO 0603 CAP 220UF 4V AO X7343 CAP 9.0PF 50V CERAMIC NPO 0603 CAP .10UF 10V CERAMIC X7R 0603 Panasonic - ECG Kemet Electronics(R) Panasonic - ECG Kemet Electronics ECJ-1VB1H152K A700X227M004ATE015 ECJ-1VC1H090D C0603C104K8RACTU CAP 4.7UF 10V CERAMIC X5R 0603 CAP .22UF 10V CERAMIC X5R 0603 CAP 22UF 16V CERAMIC X5R 1210 Panasonic - ECG Panasonic - ECG TDK Electronics Corporation ECJ-1VB0J475M ECJ-1VB1A224K C3225X5R1C226M 2 2 2 2 2 2 1 2 C21, C22 C23, C39 C24, C40 C28 D1, D3 CAP DNP0603 CAP 33PF 50V CERAMIC NPO 0603 CAP 1000PF 50V CERAMIC NPO 0603 CAP CERAMIC 18PF 50V 0603 SMD LED 660NM SUPER RED DIFF 0603SMD 1 1 D2 J1 3 2 2 J2, J3, J4 L1, L2 Q1, Q4 2 Q2, Q3 10 (R) CAP 1.0UF 10V CERAMIC X5R 0603 C1, C9, C16, C25, C26, C29, C33, C36, C38 C2, C4, C20, C37 C3, C15 C5, C19 C6, C7, C11, C14, C17, C27, C30, C31, C32, C34 C8, C18 C10, C35 C12, C13 4 2 2 10 Manufacturer Panasonic - ECG Panasonic - ECG Panasonic - ECG Lumex(R) Opto/ Components Inc. DIODE SCHOTTKY 25V 1.0A MINI-2P Panasonic - SSG CONN MOD JACK 6-6 R/A PCB 50AU AMP/Tyco Electronics CONN TERM BLOCK 2POS 5MM PCB Phoenix Contact(R) HIGH CURRENT SMT 1UH INDUCTORS Cooper Electronics N-CHANNEL MOSFET DPAK Fairchild(R) Semiconductor N-CHANNEL MOSFET DPAK Fairchild Semiconductor RES 10.0 OHM 1/16W 1% 0603 SMD Panasonic - ECG ECJ-1VC1H330J ECJ-1VC1H102J ECJ-1VC1H180J SML-LX0603SRW-TR MA2YD2300L 555165-1 1715022 HC1-1R1 FDD6676S FDD6670A R1, R6, R12, ERJ-3EKF10R0V R17, R20, R23, R27, R31, R43, R52 6 R2, R19, R22, RES DNP0603 R25, R29, R50 2 R3, R24 RES 3.30 OHM 1/4W 1% 1206 SMD Yageo America 9C12063A3R30FGHFT 2 R4, R46 RES 1.00K OHM 1/16W 1% 0603 SMD Panasonic - ECG P1.00KHCT-ND 2 R5, R18 RES 221 OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF2210V 4 R7, R9, R16, R21 RESISTOR 1.0 OHM 1/10W 5% 0603 Panasonic - ECG ERJ-3GEYJ1R0V 2 R8, R45 RES 14.7K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1472V 2 R10, R15 RES 24.9K OHM 1/16W 1% 0603 SMD Panasonic - ECG ERJ-3EKF2492V Note 1: 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. (c) 2008 Microchip Technology Inc. DS51531B-page 21 MCP1630 Dual Buck Reference Design TABLE B-1: BILL OF MATERIALS Qty Reference 3 1 1 3 2 1 1 3 2 2 1 1 1 3 1 1 R11, R39, R44 R13 R14 R26, R40, R51 R28, R49 R30 R32 R33, R36, R48 R34, R41 R35, R42 R37 R38 R47 SW1, SW2, SW3 T1 TP6 (BOM) (CONTINUED) Description Manufacturer Part Number Panasonic - ECG ERJ-3EKF7871V Panasonic - ECG ERJ-3EKF4991V Panasonic - ECG ERJ-3EKF2212V Panasonic - ECG ERJ-3EKF3011V Panasonic - ECG ERJ-3EKF3012V Panasonic - ECG ERJ-3EKF4751V Panasonic - ECG ERJ-3GEYJ202V Panasonic - ECG ERJ-3EKF1003V Panasonic - ECG ERJ-3EKF1502V Panasonic - ECG ERJ-3EKF1002V Panasonic - ECG ERJ-8RQF2R2V Panasonic - ECG ERJ-3EKF3320V Panasonic - ECG P2.21KHCT-ND E-Switch Inc. TL3301NF260QG DatatronicsTM CT323-060 Keystone 5016 Electronics 2 U1, U8 High-Speed Analog PWM MSOP8 Microchip MCP1630-E/MS Technology Inc. 2 U2, U7 2A Synchronous MOSFET Driver Microchip MCP14628-E/SN Technology Inc. 2 U3, U6 5 Lead SC70 OP AMP Microchip MCP6231U Technology Inc. 1 U4 250 mA Low Iq LDO Regulator Microchip MCP1703-5002E/MB Technology Inc. Microchip PIC16F684-I/ST 1 U5 IC PIC(R) MCU FLASH 2KX14 14TSSOP Technology Inc. 2 U9, U10 MCP6501 TEMPERATURE SWITCH 75C Microchip TC6501P075VCTTR Technology Inc. Note 1: 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. DS51531B-page 22 RES 7.87K OHM 1/16W 1% 0603 SMD RES 4.99K OHM 1/16W 1% 0603 SMD RES 22.1K OHM 1/16W 1% 0603 SMD RES 3.01K OHM 1/16W 1% 0603 SMD RES 30.1K OHM 1/16W 1% 0603 SMD RES 4.75K OHM 1/16W 1% 0603 SMD RES 2.0K OHM 1/10W 5% 0603 SMD RES 100K OHM 1/16W 1% 0603 SMD RES 15.0K OHM 1/16W 1% 0603 SMD RES 10.0K OHM 1/16W 1% 0603 SMD RES 2.2 OHM 1/4W 1% 1206 SMD RES 332 OHM 1/16W 1% 0603 SMD RES 2.21K OHM 1/16W 1% 0603 SMD SWITCH TACT 6MM 260GF SMT SMD Current Sense Transformer PC TEST POINT COMPACT SMT (c) 2008 Microchip Technology Inc. MCP1630 DUAL BUCK REFERENCE DESIGN Appendix C. Evaluation Board Firmware C.1 DEVICE FIRMWARE For the latest version of the MCP1630 Dual Buck Reference Design firmware, visit the Microchip web site at www.microchip.com. Power-Up Initialize: Ports, Clocks, A/D, PWM, IIC and Interrupts VIN ok? No Yes No ON Detected? Yes Yes Mode Pressed? LED Flashing No Start Converter Using programmed settings Yes Turn VOUT1 On Mode Pressed? Fault Detected Increment PWM No Yes Off Detected Yes No Yes No Set Pressed? No Set up VOUT2 Shutdown Converter Flash LED Select Sequencing or Tracking End Select Frequency Dithering On or Off Yes FIGURE C-1: (c) 2008 Microchip Technology Inc. Setup Complete No Firmware Flowcharge - Page 1. DS51531B-page 23 WORLDWIDE SALES AND SERVICE AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://support.microchip.com Web Address: www.microchip.com Asia Pacific Office Suites 3707-14, 37th Floor Tower 6, The Gateway Harbour City, Kowloon Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431 India - Bangalore Tel: 91-80-4182-8400 Fax: 91-80-4182-8422 India - New Delhi Tel: 91-11-4160-8631 Fax: 91-11-4160-8632 Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 India - Pune Tel: 91-20-2566-1512 Fax: 91-20-2566-1513 France - Paris Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 Japan - Yokohama Tel: 81-45-471- 6166 Fax: 81-45-471-6122 Germany - Munich Tel: 49-89-627-144-0 Fax: 49-89-627-144-44 Atlanta Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455 Boston Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088 Chicago Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075 Dallas Addison, TX Tel: 972-818-7423 Fax: 972-818-2924 Detroit Farmington Hills, MI Tel: 248-538-2250 Fax: 248-538-2260 Kokomo Kokomo, IN Tel: 765-864-8360 Fax: 765-864-8387 Los Angeles Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608 Santa Clara Santa Clara, CA Tel: 408-961-6444 Fax: 408-961-6445 Toronto Mississauga, Ontario, Canada Tel: 905-673-0699 Fax: 905-673-6509 Australia - Sydney Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 China - Beijing Tel: 86-10-8528-2100 Fax: 86-10-8528-2104 China - Chengdu Tel: 86-28-8665-5511 Fax: 86-28-8665-7889 Korea - Daegu Tel: 82-53-744-4301 Fax: 82-53-744-4302 China - Hong Kong SAR Tel: 852-2401-1200 Fax: 852-2401-3431 Korea - Seoul Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934 China - Nanjing Tel: 86-25-8473-2460 Fax: 86-25-8473-2470 Malaysia - Kuala Lumpur Tel: 60-3-6201-9857 Fax: 60-3-6201-9859 China - Qingdao Tel: 86-532-8502-7355 Fax: 86-532-8502-7205 Malaysia - Penang Tel: 60-4-227-8870 Fax: 60-4-227-4068 China - Shanghai Tel: 86-21-5407-5533 Fax: 86-21-5407-5066 Philippines - Manila Tel: 63-2-634-9065 Fax: 63-2-634-9069 China - Shenyang Tel: 86-24-2334-2829 Fax: 86-24-2334-2393 Singapore Tel: 65-6334-8870 Fax: 65-6334-8850 China - Shenzhen Tel: 86-755-8203-2660 Fax: 86-755-8203-1760 Taiwan - Hsin Chu Tel: 886-3-572-9526 Fax: 886-3-572-6459 China - Wuhan Tel: 86-27-5980-5300 Fax: 86-27-5980-5118 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 China - Xiamen Tel: 86-592-2388138 Fax: 86-592-2388130 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 China - Xian Tel: 86-29-8833-7252 Fax: 86-29-8833-7256 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 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 China - Zhuhai Tel: 86-756-3210040 Fax: 86-756-3210049 01/02/08 DS51531B-page 24 (c) 2008 Microchip Technology Inc. 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