Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide © 2008 Microchip Technology Inc.
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.
BUCK/BOOST CONVERTER PICtail™ PLUS DAUGHTER BOARD USER’S GUIDE Table of Contents Preface ........................................................................................................................... 1 Chapter 1. Introduction 1.1 Overview ........................................................................................................ 7 1.2 Features ....................................................................................................... 11 1.3 Product Package .............
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide NOTES: DS70336A-page iv © 2008 Microchip Technology Inc.
BUCK/BOOST CONVERTER PICtail™ PLUS DAUGHTER 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.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide • Chapter 4. “Demonstration Program Operation” – This chapter describes the operation of the Buck/Boost Converter PICtail Plus Daughter Board. • Appendix A. “Schematics and Layouts” – This appendix illustrates the Buck/Boost Converter PICtail Plus Daughter Board layout and provides hardware schematic diagrams.
Preface 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. RECOMMENDED READING This user's guide describes how to use the Chapter Name. Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference resources.
Buck/Boost Converter PICtail™ Plus Daughter Board 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.
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.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide NOTES: DS70336A-page 6 © 2008 Microchip Technology Inc.
BUCK/BOOST CONVERTER PICtail™ PLUS DAUGHTER BOARD USER’S GUIDE Chapter 1. Introduction Modern power supplies are becoming smaller, more efficient, more flexible and less expensive. These desirable enhancements have come about as digital signal controllers are incorporated into Switch Mode Power Supply (SMPS) designs. Buck converters are used when the desired output voltage is smaller than the input voltage. Boost converters are used when the desired output voltage is higher than the input voltage.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide The dsPIC33F SMPS family of devices provides the following features: • Integrated program and data memory on a single chip • Ultra-fast interrupt response time and hardware interrupt priority logic • Up to 4 Msps, on-chip ADC with two SARs, and up to four dedicated and two shared sample/hold circuits for multiple loop control • Four independent, high-resolution PWM generators specially designed to support different power topologies • Four analog
Introduction FIGURE 1-2: 16-BIT 28-PIN STARTER DEVELOPMENT BOARD WITH DAUGHTER BOARD VIN LOAD VIN AN4 PWM1H VOUT1 I1 VDD VIN V1 16-BIT 28-PIN STARTER DEVELOPMENT BOARD PWM1H PWM1L PWM1L LOAD AN0 I1 GND AN1 PWM3L V1 Load VIN VOUT2 PWM2H PWM2H I2 PWM2L V2 AN2 I2 AN3 V2 PWM2L © 2008 Microchip Technology Inc.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide FIGURE 1-3: EXPLORER 16 DEVELOPMENT BOARD WITH DAUGHTER BOARD VIN AN4 LOAD VIN VDD VIN PWM1H VOUT1 I1 PWM1H EXPLORER 16 DEVELOPMENT BOARD V1 PWM1L PWM1L LOAD I1 AN0 GND V1 AN1 Load PWM3L VIN I2 PWM2H PWM2H V2 PWM2L PWM2L AN2 AN3 I2 V2 VIN VOUT3 V3 PWM3H AN8 AN9 DS70336A-page 10 I3 PWM3H I3 V3 © 2008 Microchip Technology Inc.
Introduction 1.2 FEATURES The Buck/Boost Converter PICtail Plus Daughter Board provides the following features: 1.2.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide NOTES: DS70336A-page 12 © 2008 Microchip Technology Inc.
BUCK/BOOST CONVERTER PICtail™ PLUS DAUGHTER BOARD USER’S GUIDE Chapter 2. Hardware Overview This chapter lists and describes the hardware elements and components of the Buck/Boost Converter PICtail Plus Daughter Board (also referred to as Daughter Board). The following topics are included: • • • • • 2.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide Note: 2.2 The Daughter Board only consists of the three power trains of the DC/DC converter sections. Either the 16-bit 28-pin Starter Development Board with the dsPIC33FJ16GS502 device, or the Explorer 16 Development Board with the dsPIC33FJ16GS504 device can be used to control the DC/DC power sections of the Daughter Board. The J1 and J2 connectors provide the necessary signals for control purposes.
Hardware Overview 2.2.3 16-bit 28-pin Starter Development Board Connector J2 The two converter stage sections of the Daughter Board can be controlled using the 16-bit 28-pin Starter Development Board. Table 2-1 lists all of the power and signal connections on the Daughter Board J2 connector to the user interface with the 16-bit 28-pin Starter Development Board. See Figure A-6 for the location of this connector. TABLE 2-1: Pin Number Primary © 2008 Microchip Technology Inc.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide 2.2.4 Explorer 16 Development Board Connector J1 The two buck sections and one boost section of the Daughter Board can be controlled using the Explorer 16 Development Board. Table 2-2 lists all the power and signal connections on the Daughter Board J1 connector to the user interface with the Explorer 16 Development Board. See Figure A-6 for the location of this connector.
Hardware Overview 2.2.5 VOUT1 J4 (Buck1+) An external load can be connected to VOUT1 through the J4 connector. One on-board parallel resistor, R44 (5Ω/5W), is connected at the output of VOUT1 through MOSFET Q13 to optionally load the Buck 1 converter circuit. Resistor R45 is on-board, and there is space to solder resistor R46 onto the board. When resistor R46 is connected to VOUT1, the J11 jumper must be open while working with +9V power from the control board.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide 2.2.10 Test Points The Daughter Board provides the various test points of the PWM signals, feedback signals and input and output voltages for the user application. Table 2-5 lists the PWM test points that can be used to check the PWM gate pulse for all three power stages.
Hardware Overview 2.3 USING THE DAUGHTER BOARD WITH THE EXPLORER 16 DEVELOPMENT BOARD This section describes the hardware connection of the Daughter Board with the Explorer 16 Development Board. Figure 2-3 displays the Daughter Board hardware connection (MPLAB ICD 2 and power supply) to the Explorer 16 Development Board. The dsPIC33FJ16GS504 SMPS device controls both buck stages (Buck 1 and Buck 2), as well as the boost stage through the Explorer 16 Development Board simultaneously.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide 2.4 USING THE DAUGHTER BOARD WITH THE 16-BIT 28-PIN STARTER DEVELOPMENT BOARD This section describes the use of a 16-bit 28-pin Starter Development Board with the Buck/Boost Converter PICtail Plus Daughter Board. Figure 2-4 shows the 16-bit 28-pin Starter Development Board and its hardware elements.
Hardware Overview FIGURE 2-5: DAUGHTER BOARD HARDWARE CONNECTED TO A 16-BIT 28-PIN STARTER DEVELOPMENT BOARD MPLAB® ICD 2 MPLAB ICD 2 Connector +9V Power Supply Connector Buck/Boost Converter PICtail™ Plus Daughter Board 16-bit 28-pin Starter Development Board 2.4.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide FIGURE 2-6: FEEDBACK JUMPERS J12 J13 J14 J15 2.4.2.1 HARDWARE The following hardware changes are required in the Daughter Board to enable control of the Buck 1 and Boost stage: • Jumper J12 and J13: Open • Jumper J14 and J15: Short with jumper header (close) 2.4.2.
Hardware Overview 2.5 POWER RATING OF CONVERTER STAGE All three DC/DC power stages in a Daughter Board can be loaded externally through the output terminal blocks J4, J5 and J8. For loading any power stage externally, the user must provide an auxiliary power source to the Daughter Board through input terminal block J9. 2.5.1 Buck 1 Converter The Buck 1 converter stage is rated for a maximum output current of 3 amps through the J4 connector.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide NOTES: DS70336A-page 24 © 2008 Microchip Technology Inc.
BUCK/BOOST CONVERTER PICtail™ PLUS DAUGHTER BOARD USER’S GUIDE Chapter 3. Getting Started This chapter provides details to get started using the Daughter Board with the 16-bit 28-pin Starter Development Board using the dsPIC33FJ16GS502 SMPS device. The 16-bit 28-pin Starter Development Board is modified as per Section 2.4 “Using the Daughter Board with the 16-bit 28-pin Starter Development Board”.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide 3.2 CREATING THE PROJECT This section describes the process of creating a project and workspace in MPLAB IDE. In any particular folder, one project and one workspace are present. Note: These instructions presume the use of MPLAB IDE v8.10 or later. A project consists of files that are used to build an application (source code, linker script files, etc.) along with their association to various build tools and build options.
Getting Started 3.2.1.1 1. 2. 3. 4. 5. PROJECT WIZARD STEP ONE – SELECTING THE DEVICE Start MPLAB IDE. Close any open workspace (File>Close Workspace). Select Project>Project Wizard. The Welcome dialog appears. Click Next to continue. The Select a device dialog appears. From the Device drop-down list, select the required device, as shown in Figure 3-1. FIGURE 3-1: SELECT A DEVICE 6. Click Next to continue. The Select a language toolsuite dialog appears, as shown in Figure 3-2.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide 3.2.1.2 PROJECT WIZARD STEP TWO – SELECTING THE LANGUAGE TOOLSUITE 1. As shown in Figure 3-2, select Microchip C30 Toolsuite from the Active Toolsuite drop-down list. This toolsuite includes the assembler and linker that is to be used in the project. Note: To create a project that consists of source files written in a language other than Microchip Assembly, select the specific language toolsuite from the drop-down menu.
Getting Started 3.2.1.3 PROJECT WIZARD STEP THREE – NAME YOUR PROJECT 1. As shown in Figure 3-3, under Create New Project File, click Browse..., and navigate to: C:\Program Files\Microchip\Buck BoostPicTail Plus Board\Buck1 Voltage Mode with 28P Starter Board. Note: While using the Explorer 16 Development Board, navigate to the following path in the “Create New Project File”: C:\Program Files\Microchip\Buck Boost PicTail Plus Board\3-Stage Voltage Mode with Explorer 16.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide 3.2.1.4 PROJECT WIZARD STEP FOUR – ADD FILES TO YOUR PROJECT 1. As shown in Figure 3-4, from the left pane, navigate to C:\...\Buck1 Voltage Mode with 28P Starter Board, and select the following files: • init.c • isr.c • main.c • dsp.h • function.h • dspcommon.inc • isr_asm.s • pid.s FIGURE 3-4: ADD FILES TO PROJECT 2. Click Add to include the files in the project. The selected files appear in the right pane. 3. Click Next to continue.
Getting Started 3.2.1.5 PROJECT SUMMARY Click Finish to complete the project. FIGURE 3-5: SUMMARY DIALOG After completing the project wizard, the MPLAB IDE project window lists the following files in the Source Files folder: • • • • • isr.c main.c isr_asm.s pid.s init.c Note: While using the Explorer 16 Development Board, the MPLAB IDE project window lists the following files in the Source Files folder: • • • • • © 2008 Microchip Technology Inc. init.c isr.c main.c isr_asm.s pid.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide 3.2.1.6 VIEWING THE PROJECT 1. Click View>Project from the MPLAB IDE menu, as shown in Figure 3-6. FIGURE 3-6: OPEN PROJECT FILE The Buck1 Voltage Mode.mcw dialog appears, as shown in Figure 3-7. A project, Buck1 Voltage Mode.mcp, and workspace, Buck1 Voltage Mode.mcp, are created in MPLAB IDE. Note: DS70336A-page 32 While using the Explorer 16 Development Board, the 3-Stage Voltage Mode.mcp appears. A 3-Stage Voltage Mode.
Getting Started FIGURE 3-7: MPLAB® IDE PROJECT WINDOW 2. Double click the main.c file in the project window to open the file. The MPLAB IDE Workspace Window appears, as shown in Figure 3-8. This completes the project view process. © 2008 Microchip Technology Inc.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide FIGURE 3-8: 3.3 MPLAB® IDE WORKSPACE WINDOW BUILDING THE CODE Building the code consists of the following process: • Assembling all of the *.c and *.s files to create the respective object files (*.o) • Linking the object files to create the 3-Stage Voltage Mode.hex and 3-Stage Voltage Mode.cof output files The .hex file contains the specific data to program the device. The .
Getting Started 3.3.1 Building the Code To specify the Project Build Options: 1. Select Build Options>Project from the Project menu. The Build Options For Project “Buck 1 Voltage Mode.mcp” dialog appears, as shown in Figure 3-9. FIGURE 3-9: BUILD OPTIONS 2. Select Assemble/Compile/Link in the project directory, and then click OK. This completes the code build process. 3.3.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide FIGURE 3-10: 3.3.3 LINK PROJECT FOR MPLAB® ICD 2 Building the Project To build the project: 1. Select Project>Build All from the MPLAB IDE menu, as shown in Figure 3-11. FIGURE 3-11: DS70336A-page 36 DualBuck MPLAB® IDE SCREEN © 2008 Microchip Technology Inc.
Getting Started 2. Observe the progress of the build in the Output window, as shown in Figure 3-12. This completes the project build process. The device can be programmed if the build status is BUILD SUCCEEDED. If the build status is BUILD FAILED, the build errors that are listed must be resolved. FIGURE 3-12: BUILD OUTPUT WINDOW © 2008 Microchip Technology Inc.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide 3.4 PROGRAMMING THE DEVICE The MPLAB ICD 2 In-Circuit Debugger can be used to program and debug the dsPIC33FJ16GS502 device in-circuit on the Daughter Board. Note: 3.4.1 Before proceeding, ensure that the USB driver for the MPLAB ICD 2 is installed on your PC. Refer to the “MPLAB® ICD 2 In-Circuit Debugger User’s Guide” (DS51331) for details. Setting up the Device Configuration 1.
Getting Started 3.4.2 Connecting the MPLAB ICD 2 In-Circuit Debugger 1. Connect the MPLAB ICD 2 to the PC using the USB cable. 2. Connect the MPLAB ICD 2 to the 16-bit 28-pin Starter Development Board with the short RJ-11 (telephone) cable. Apply +9V power to the 16-bit 28-pin Starter Development Board. FIGURE 3-15: DAUGHTER BOARD CONNECTED TO MPLAB® ICD 2 IN-CIRCUIT DEBUGGER © 2008 Microchip Technology Inc.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide 3.4.3 Enabling the MPLAB ICD 2 Connection 1. Select Debugger>Select Tool>MPLAB ICD 2 to designate the MPLAB ICD 2 as the debug tool in MPLAB IDE, as shown in Figure 3-16. FIGURE 3-16: SELECTING THE DEBUGGER 2. Select Debugger>Connect to connect the debugger to the device. The MPLAB ICD 2 should report that it found the dsPIC33FJ16GS502 device, as shown in Figure 3-17. DS70336A-page 40 © 2008 Microchip Technology Inc.
Getting Started FIGURE 3-17: ENABLING MPLAB® ICD 2 3. Select Debugger>Settings to display the MPLAB ICD 2 Debugger settings. 4. Select the Program tab on the Debugger settings dialog box. 5. Select the Allow ICD 2 to select memories and ranges radio button, as shown in Figure 3-18. This setting will speed up operations by programming only a small part of the total program memory. Note: © 2008 Microchip Technology Inc.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide FIGURE 3-18: DS70336A-page 42 SETTING PROGRAM MEMORY SIZE © 2008 Microchip Technology Inc.
Getting Started 3.4.4 Programming the dsPIC33FJ16GS502 Device To program the device: 1. From the Debugger, select Debugger>Program. The Output (Program Memory window), as shown in Figure 3-19, displays the program statuses as they appear. FIGURE 3-19: PROGRAMMING THE dsPIC33FJ16GS502 DEVICE 2. Observe the process in the Output window. When MPLAB ICD 2 Ready appears, the device is programmed and ready to run. 3. Select Debugger>Reset to reset the code. 4. Select Debugger>Run to run the code.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide 3.5 DEBUGGING THE CODE The MPLAB ICD 2 In-Circuit Debugger can be used to run, halt, and step the code. A breakpoint can be set to halt the program after the code has executed the instruction at the breakpoint. The contents of the RAM and registers can be viewed whenever the processor has been halted.
Getting Started 3. Press to halt the processor and press to reset the processor. The Program Memory now displays a green arrow pointing to the line of code at address 0. The instruction at this location is goto 0x000100. This code is added by the linker to make the program branch to the start of the code in the main.c file. The executable code starts from location 0x000100. 3.5.2 Stepping the Program To step the program: 1. Press to single step the code.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide FIGURE 3-22: WATCH WINDOW 4. Select DTR1 from the Add SFR drop-down list and click Add SFR to add the DTR1 register in the Watch window. 5. Select PWMCON1 from the Add SFR drop-down list and click Add SFR to add the PWMCON1 register in the Watch window. 6. Select ADCON from the Add SFR drop-down list and click Add SFR to add the ADCON register in the Watch window. You will be able to see these registers change as you step through the code. 3.
Getting Started FIGURE 3-23: SETTING BREAKPOINT 2. Press to run the code. The program halts on the instruction following the breakpoint. Note: © 2008 Microchip Technology Inc. An alternate method to set a breakpoint is to simply double click the line. This feature may need to be enabled using the Edit>Properties menu.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide NOTES: DS70336A-page 48 © 2008 Microchip Technology Inc.
BUCK/BOOST CONVERTER PICtail™ PLUS DAUGHTER BOARD USER’S GUIDE Chapter 4. Demonstration Program Operation The Buck/Boost Converter PICtail Plus Daughter Board CD supplied with the Buck/Boost Converter PICtail Plus Daughter Board consists of the source code for the 16-bit 28-pin Starter Development Board (Buck 1 stage only) and Explorer 16 Development Board (Buck 1, Buck 2 and Boost stages).
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide • Dead-Time Gain – This parameter produces a correction factor that compensates for the fact that the feed forward gain term does not account for the energy lost due to the dead time of the PWM signal (the time when both MOSFETs are off). • Current-Limit Gain – This parameter limits the cumulative control gain when the current is approaching its upper limit.
Demonstration Program Operation 4.2 CODE DEMONSTRATION System Initialization 4.2.1 When power is applied to the board, the program starts by executing the following system initialization routines: • Peripherals – The required peripherals (PWM, ADC, Timers and GPIO) are configured and enabled. • Variables – Program variables are defined. RAM locations and register usage are defined and documented.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide NOTES: DS70336A-page 52 © 2008 Microchip Technology Inc.
J1 Buck/Boost Converter PICtail Plus Daughter Board J2 R40 R46 R41 R42 Q12 R43 R33 C7 R6 Q3 R10 R7 D2 D3 R3 R5 D4 R9 R8 Buck 1 R4 C29 C9 C8 Q2 Q1 J14 J13 J12 D1 C6 Q8 Q7 C30 D17 R35 J3 R36 R34 U3 C13 TX2 R53 GND D14 J10 RP1 R15 C26 R14 Q4 C20 C5 R13 R54 D13 C28 L5 R59 GND Boost C24 C25 C27 R52 Q14 D9 J8 R56 D10 C4 R55 BOOST+ R47 R45 C22 R60 J9 D5 R27 V+ R21 R23 C15 D8 D7 D12 D6 J5 C19 GND R26 Q6 Buck 2 J6 D18 R2 R1 C14 R24 R28 C1
C29 0.1uF A B C9 4.7uF 25V A B PWM1L PWM1H 9VANA_GND C8 Load A 9VANA_GND 3.3K 3.3K R32 B 1k R39 0.1uF U1 A 9VANA_GND R33 LM5101 Diode_DO-214 D3 R8 B B A 5.1k BAS16 R10 B VIN R9 B A 22R 1% 1/8W D4 22R 1% 1/8W A BAS16 D2 G G A FDS6298 S D S D 470R R37 FDS6298 +9V B 5.
C30 4.7uF 25V 0.1uF B B A C16 220uF 25V Elec D7 C15 A B B PWM2L 9VANA_GND 9VANA_GND LM5101 3.3K 3.3K R20 6 LI R31 8 5 HI Vss LO HS 4 Diode_DO-214 0.1uF U2 3 VDDHB HO +9V C13 9VANA_GND PWM2H 9VANA_GND A R26 B BAS16 3 D6 A G A A B 5.1k R28 B BAS16 22R D8 R27 S CST1_060L 9VANA_GND Comp2 G D S D VIN Feedback 22R 1% 1/8W A 2.4K 10K R47 B TX2 10uH L4 R21 1k A R22 B Cuurent SenseBuck2 9VANA_GND B B Comp 2 9VANA_GND BAS16 C17 150uF 6.
C24 Current Sense2 9VANA_GND C25 0.1uF A B 8 Current Sense3 J14 TC1428COA NC NC 7 INA OUTA 6 VSS VDD INB OUTB 5 U3 3.3K A R52 B BAS16 +3.3V_DIG 9VANA_GND B 9VANA_GND 22R 1% 1/8W D9 R15 R34 B 5.1k A +9V BSR14_SOT23 20k 1% 1/8W A B +3.3V_DIG R13 2.2k 1% 1/8W A B Q4 2.2nF 25V A B 1k R54 G 22uH FDT459N 9VANA_GND A S D Schottky Q14 R53 C26 C20 D10 220uF 25V Elec PWM3H C5 R54 C28 4.7uF 25V A B R14 0.47nF A B 3.
Schematics and Layouts FIGURE 1-5: DAUGHTER BOARD SCHEMATIC 4 OF 5 1 1 +3.3V_DIG RP1 2 1 5k DNP J10 2 POT DNP VIN B 1 1 3 5k DNP 9VANA_GND 10k +9V 1 2 1 V+ J9 1 1 GND D14 C22 2 *Shunt J6 must be connected when using either the Explorer 16 or 16-bit 28-pin Starter Development 9VANA_GND Board to power the Daughter Board 1 TP2 100uF 25V 2 2 LED_0805 2 B 1 AUXILIARY INPUT J6 1 TP1 R60 A A VIN 9VANA_GND © 2008 Microchip Technology Inc.
Buck/Boost Converter PICtail™ Plus Daughter Board User’s Guide FIGURE 1-6: DAUGHTER BOARD SCHEMATIC 5 OF 5 Explorer 16 Connector 16-bit 28-pin Connector +9V J1 J2 Current Sense1 Voltage FB2 Current Sense2 PWM2L 9VANA_GND Load 9VANA_GND PWM1L Current Sense2 PWM1H PWM2H 9VANA_GND PWM3H +3.3V_DIG Voltage FB Buck 1 Voltage FB2 PWM2L VIN Feedback PWM2H Load +3.3V_DIG +3.3V_DIG PWM3H 9VANA_GND +9V +9V 9VANA_GND SDA/RX 9VANA_GND +3.
BUCK/BOOST CONVERTER PICtail™ PLUS DAUGHTER BOARD USER’S GUIDE Index A M ADC Interrupt ........................................................... 51 Additional Features .................................................. 11 Microchip Internet Web Site ....................................... 4 MPLAB ICD 2 Keyboard Shortcuts .......................................... 44 Programming the Device .................................. 43 Project Build Options ........................................
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