MIC28517 - Carte d'évaluation Microchip - Free user manual and instructions

USER MANUAL MIC28517 Microchip

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© 2020-2021, Microchip Technology Incorporated, All Rights Reserved.

ISBN: 978-1-5224-8465-3

For information regarding Microchip's Quality Management Systems, please visit www.microchip.com/quality.

Table of Contents

Preface 5

Chapter 1. Product Overview

1.1 Introduction ...... 9
1.2 MIC28517 Evaluation Board Overview 9
1.3 MIC28517 Evaluation Board Features 10
1.4 Contents of the MIC28517 Evaluation Board Kit 10

Chapter 2. Installation and Operation

2.1 System and Configuration Requirements .... 11
2.2 Board Setup 11
2.3 Circuit Description 12
2.3.1 Feedback Resistors 12
2.3.2 SW Node 13
2.3.3 Current Limit 13
2.3.4 Loop Gain Measurement 13
2.3.5 Setting the Switching Frequency 13
2.3.6 MODE Selection Pin 14
2.3.7 Auxiliary Bootstrap LDO (EXTVDD) 14

Appendix A. Schematic and Layouts

A.1 Introduction 15
A.2 Board – Schematic 16
A.3 Board – Top Silk 17
A.4 Board – Top Copper and Silk 17
A.5 Board – Top Copper 18
A.6 Board – Bottom Copper 18
A.7 Board – Bottom Copper and Silk 19
A.8 Board – Bottom Silk 19
A.9 Board – Bottom View with Heatsink HS1 Mounted 20

Appendix B. Bill of Materials (BOM)

Worldwide Sales and Service 23

NOTES:

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our website (www.microchip.com) to obtain the latest documentation available.

Documents are identified with a "DS" number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is "DSXXXXXXXXA", where "XXXXXXXXX" 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 MIC28517 Evaluation Board. Items discussed in this chapter include:

• Document Layout
• Conventions Used in this Guide
• Recommended Reading
  • The Microchip Website
• Customer Support
  • Document Revision History

DOCUMENT LAYOUT

This document describes how to use the MIC28517 Evaluation Board as a development tool to emulate and debug firmware on a target board. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MIC28517 Evaluation Board.
• Chapter 2. “Installation and Operation” – Includes instructions on installing and starting the MIC28517 Evaluation Board.
• Appendix A. "Schematic and Layouts" – Shows the schematic and layout diagrams for the MIC28517 Evaluation Board.
• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the MIC28517 Evaluation Board.

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples
Arial font:
Italic characters Referenced books	oks MPLAB	^ IDE User's Guide
	Emphasized text ...is the only compiler...
Initial caps A window the Output	window
	A dialog the Settings dialog
	A menu selection select Enable Programmer
Quotes A field name in a window or dialog		"Save project before build"
Underlined, italic text with right angle bracket	A menu path File>Save	——
Bold characters A dialog button	Click OK
	A tab	Click the Power tab
N'Rnnnn	A number in verilog format, where N is the total number of digits, R is the radix and n is a digit.	4'b0010, 2'hF1
Text in angle brackets <>	A key on the keyboard	Press,,
Courier New font:
Plain Courier New	Sample source code	#define START
	Filenames	autoexec.bat
	File paths	c:\mcc18\h
	Keywords	_asm, _endasm, static
	Command-line options	-0pa+, -0pa-
	Bit values	0, 1
	Constants	0xFF, 'A'
Italic Courier New	A variable argument	file.o, where file can be any valid filename
Square brackets []	Optional arguments	mccl8 [options] file [options]
Curly brackets and pipe character: { | }	Choice of mutually exclusive arguments; an OR selection	errorlevel {0|1}
Ellipses...	Replaces repeated text	var_name [, var_name...]
	Represents code supplied by user	void main (void) { ... }

RECOMMENDED READING

This user's guide describes how to use the MIC28517 Evaluation Board. Another useful document is listed below. The following Microchip document is available and recommended as a supplemental reference resource:

- MIC28517 Data Sheet – “70V/8A Hyper Speed Control® Synchronous DC/DC Buck Regulator with External Mode Control” (DS20006317)

THE MICROCHIP WEBSITE

Microchip provides online support via our website at www.microchip.com. This website is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the website contains the following information:

• Product Support – Data sheets and errata, application notes and sample programs, design resources, user's guides and hardware support documents, latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical support requests, online discussion groups, Microchip consultant program member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative
- Local Sales Office
• Field Application Engineer (FAE)
- Technical Support

Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document.

Technical support is available through the website at:

http://www.microchip.com/support.

DOCUMENT REVISION HISTORY

Revision B (June 2021)

• Updated Figure 2-1.
• Minor editorial corrections.

Revision A (July 2020)

- Initial release of this document

NOTES:

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the MIC28517 Evaluation Board and covers the following topics:

• MIC28517 Evaluation Board Overview
• MIC28517 Evaluation Board Features
- Contents of the MIC28517 Evaluation Board Kit

1.2 MIC28517 EVALUATION BOARD OVERVIEW

The MIC28517 Evaluation Board is a constant frequency, synchronous buck controller featuring a unique adaptive on-time control architecture. The MIC28517 operates over an input supply range of 4.5V to 70V. The output voltage is adjustable down to 0.6V with an ensured accuracy of ±1%. The device operates with a programmable switching frequency from 270 kHz to 800 kHz. The Mode pin allows the user to select either the forced CCM operation or HLL mode of operation for improved efficiency at light loads.

VOUT VOUT EXTVDD SW GND J4 J1 R17 J2 VOUT Marking PUIN MICROCHIP MIC28516/7 Evaluation Board ALU C16 C11 R16 U1 C17 C21 C20 C19 C18 GND C12 C13 C14 C9 R14 C7 R1 R7 R13 C8 C4 R12 R8 C3 R3 R11 C10 R20 R2 C1 R5 R6 R10 R19 C2 GND VDD MODE GND 0.8V 1.2V 2.5V 3.3V 5.0V 12V J10 GND PG GND EN GND J8 J7 J6 J9 J5 J7 J6 J9 J5 J7 J6

FIGURE 1-1: MIC28517 Evaluation Board.

1.3 MIC28517 EVALUATION BOARD FEATURES

The MIC28517 Evaluation Board:

• Features a Mode selection pin through jumper J6, which allows the user to select either the CCM or HLL mode of operation.
• Features six selectable output voltages: 0.8V, 1.2V, 2.5V, 3.3V, 5V and 12V.
• Features an auxiliary bootstrap Low Dropout (LDO) which improves the system efficiency by supplying the internal bias power from the output of the converter.
• Features a logic level Enable (EN) signal that can be used to enable or disable the controller.
• Can start up monotonically into a pre-biased output.
• Features an open-drain Power Good signal (PG), which signals when the output is in regulation.

The basic parameters of the evaluation board are:

• Input: 10V to 70V (optimized for 48V)
• Output: 0.8V, 1.2V, 2.5V, 3.3V, 5V or 12V Selectable through jumper J10 at 8A (default option is set to 5V)
• 270 kHz Switching Frequency (adjustable from 270 kHz to 800 kHz)

1.4 CONTENTS OF THE MIC28517 EVALUATION BOARD KIT

The MIC28517 Evaluation Board includes the following items:

• MIC28517 Evaluation Board (ADM00995)
- Important Information Sheet.

Chapter 2. Installation and Operation

2.1 SYSTEM AND CONFIGURATION REQUIREMENTS

The MIC28517 Evaluation Board requires only a single power supply with at least 8A current capability. The MIC28517 has an internal V_DD LDO so no external linear regulator is required to power the internal biasing of the IC. In applications with V_IN < +5.5V , PV_DD should be tied to PV_IN to bypass the internal linear regulator. The output load can either be a passive or an active load.

Note: The MIC28517 Evaluation Board does not have reverse polarity protection. Applying a negative voltage to the V_IN and GND terminals may damage the device. The maximum V_IN of the board is rated at 70V. Exceeding 70V on the V_IN could damage the device.

2.2 BOARD SETUP

Follow these steps prior to using the MIC28517 Evaluation Board:

1. Connect a supply to the V_IN and GND terminals, paying attention to the polarity and the supply range (10V < V_IN < 70V). Monitor I_IN with a current meter, and the input voltage at the V_IN and GND terminals with a voltmeter. Do not apply power until Step 4.
2. Connect a load to the V_OUT and GND terminals. The load can be either a passive (resistive) or an active (electronic) type. A current meter may be placed between the V_OUT terminal and load to monitor the output current. Ensure the output voltage is monitored at the V_OUT terminal.
3. Enable input. An EN connector is provided on the evaluation board for users to easily access the enable feature. Applying an external logic signal on the EN pin to pull it low, or using a jumper to short the EN pin to GND, will shut off the output of the MIC28517 Evaluation Board.
4. Turn on the V_IN supply and verify that the output voltage is regulated to the specific selected voltage.

2.3 CIRCUIT DESCRIPTION

This section describes the working principles and limitations that should be taken into account when using the MIC28517 Evaluation Board. The external components have been selected in order to optimize performance for the specific conditions of V_IN = 48 V and V_OUT = 5 V . Although the application will behave correctly for other output and input voltages, further optimization (fine-tuning of the inductor, output capacitors and ripple injection components) can be done in order to improve efficiency and transient response.

MIC28517 PVDD SVIN R9 C5 VDD VIN C4 VDD PVIN CIN VIN up to 70V R12 EN EN BST C7 L1 PG R10 PG SW R11 LIM R15 R20 C10 COUT J6 VDD MODE FB VOUT VDD VDD FREQ EXTVDD AGND PGND C8 EXTVDD R2 R4 R5 R6 R18 R19

FIGURE 2-1: Evaluation Board Circuit Description.

2.3.1 Feedback Resistors

The output voltages available on the MIC28517 Evaluation Board are: 0.8V, 1.2V, 2.5V, 3.3V, 5V and 12V, which are selectable using jumper J10.

Voltages other than the ones already available can be set by modifying the R_bot resistors according to Equation 2-1.

EQUATION 2-1:

$$ R _ {b o t} = \frac {R _ {3} \times V _ {R E F}}{V _ {O U T} - V _ {R E F}} $$

$$ \begin{array}{l} V _ {R E F} = 0. 6 \mathrm{V} \ R _ {3} = 1 0 \mathrm{k} \Omega \ \end{array} $$

Where:

Note that the output voltage should not be set to exceed 15V due to the 16V voltage rating on the output capacitors.

For output voltage higher than 15V, output capacitors of a voltage rating higher than the set output voltage should be used.

2.3.2 SW Node

Test point J2 ( V_SW ) is placed for monitoring the switching waveform, one of the most critical waveforms for the converter.

2.3.3 Current Limit

The MIC28517 Evaluation Board uses the low-side MOSFET R_DS(ON) to sense inductor current. In each switching cycle of the MIC28517 converter, the inductor current is sensed by monitoring the voltage across the low-side MOSFET, during the off period of the switching cycle, during which the low-side MOSFET is on. An internal current source of 96 A generates a voltage across the external Current-Limit Resistor, R_CL .

The I_LIM Pin Voltage ( V_ILIM ) is the difference of the voltage across the low-side MOSFET and the voltage across the resistor ( V_CL ). The sensed voltage, V_ILIM , is compared with the Power Ground (PGND) after a blanking time of 150 ns.

If the absolute value of the voltage drop across the low-side MOSFET is greater than the absolute value of the voltage across the current setting resistor ( V_CL ), the MIC28517 triggers the current-limit event. Consecutive eight current-limit events trigger the Hiccup mode. The hiccup sequence, including the Soft Start, reduces the stress on the internal MOSFETs, and protects the load and supply from severe short conditions.

The short-circuit current limit can be programmed by using the formula shown in Equation 2-2.

EQUATION 2-2:

$$ R _ {I I} = \frac {(I _ {C L I M} + \Delta I L _ {P P} \times 0 . 5) \times R _ {D S (O N)}}{I _ {C L}} $$

Where:

$$ I _ {C L I M} = \text { Desired output current limit } $$

$$ \Delta I L _ {P P} = \text { Inductor current peak - to - peak } $$

$$ R _ {D S (O N)} = \text { On resistance of low - side power MOSFET(18 m } \Omega) $$

$$ I _ {C L} = \text { Current - limit source current, the typical value is } 9 6 \mu \mathrm{A} $$

It is mandatory to make sure that the inductor current used to charge the output capacitance during Soft Start is under the current limit; otherwise, the supply will go into Hiccup mode and may not finish the Soft Start successfully.

The MOSFET R_DS(ON) can vary up to 30%-40% with temperature. Therefore, it is recommended to add a 30% margin to the I_CLIM in the above equation to avoid false current limiting due to an increased MOSFET junction temperature rise.

2.3.4 Loop Gain Measurement

Resistor R20 is placed in series with the regulator feedback path. The control loop gain can be measured by connecting an impedance analyzer across the resistor and selecting the resistor value between 10Ω to 50Ω.

2.3.5 Setting the Switching Frequency

The MIC28517 Evaluation Board is an adjustable frequency, synchronous buck converter featuring a unique adaptive on-time control architecture. The switching frequency can be adjusted between 270 kHz and 800 kHz by changing the resistor divider network consisting of R_7 and R_8 .

Equation 2-3 shows the estimated switching frequency:

EQUATION 2-3:

$$ f _ {S W} = f _ {0} \times \frac {R _ {8}}{R _ {7} + R _ {8}} $$

Where:

f_0 = Switching frequency when FREQ pin is connected to the input voltage, f_0 is typically 800 kHz

The evaluation board design is optimized for a switching frequency of 270 kHz. If the switching frequency is programmed to either lower end or higher end, the design needs optimization.

2.3.6 MODE Selection Pin

In Continuous mode, the inductor current can go negative at light loads. However, at light loads, the MIC28517 is able to force the inductor current to operate in Discontinuous mode when MODE is set to HLL mode. In HLL mode, the efficiency is optimized by shutting down all the non-essential circuits and minimizing the supply current. Jumper J6 can be used to select between the two modes of operation.

2.3.7 Auxiliary Bootstrap LDO (EXTVDD)

The MIC28517 Evaluation Board features an auxiliary bootstrap LDO which improves the system efficiency by supplying the MIC28517 internal circuit bias power from the converter output voltage. This LDO is enabled when the voltage on the EXTVDD pin is above 4.6V (typical), and at the same time, the main LDO, which operates from V_IN , is disabled to reduce power consumption. If the regulator output voltage is ≥5V and ≤12V , use the output voltage to power the MIC28517, which will increase system efficiency. The J1 jumper can be shorted to use the output voltage as EXTVDD.

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MIC28517 Evaluation Board - ADM00995:

• Board – Schematic
• Board – Top Silk
• Board – Top Copper and Silk
• Board – Top Copper
• Board – Bottom Copper
• Board – Bottom Copper and Silk
• Board – Bottom Silk
• Board – Bottom View with Heatsink HS1 Mounted

A.2 BOARD - SCHEMATIC

J1 R12 C0 724 15V 2323 R14 H2 162815 R17 42.5V ICR-2.5V/Max-1x2 J2 R1 15V 2323 C8 724 15V 2323 R29 15V 2323 C1 10V 4631 50V R3 10V 2323 C2 10V 4631 60V R4 10V 60V C3 0.3A F 20V 60V C4 2.4V 60V C5 15V 1379 20V C6 15V 2323 C7 2.4V 1379 20V C8 15V 2323 C9 15V 2323 C10 15V 2323 C11 10W F 32V 29G 24P C12 15V 1279 1279 C13 15V 1279 C14 15V 1279 C15 15V 14.0 C16 1.4V 32V 29G 24P C17 1.4V 1279 1279 C18 1.4V 1279 C19 1.4V 1279 C20 1.4V 1279 C21 1.4V 1279 C22 1.4V 1279 C23 1.4V 1279 C24 1.4V 1279 C25 1.4V 1279 C26 1.4V 1279 C27 1.4V 1279 C28 1.4V 1279

A.3 BOARD - TOP SILK

VOUT J4 VOUT EXTVDD SW GND J1 J2 L1 R17 J3 PUIN PVIN MICROCHIP MIC28516/7 Evaluation Board J11 C15 + J12 RoHS GND GND VDD MODE GND 0.8V 1.2V 2.5V 3.3V 5.0V 12V J10 GND PG GND EN GND J8 J7 J6 J9 J5 J8

A.4 BOARD - TOP COPPER AND SILK

VOUT VOUT EXTVDD SW GND J3 J4 J1 J2 PUIN VOUT L1 R17 J11 C15 + C16 C11 R16 U1 C17 C21 C20 C19 C18 MICROCHIP MIC28516/7 Evaluation Board RoHS GND GND VDD MODE GND 0.8U 1.2V 2.5V 3.3V 5.0V 12V J10 GND PG GND EN GND J8 J7 J6 J9 J5 J7 J6 J9 J5 J7

A.5 BOARD - TOP COPPER

Top-down schematic of a microchip or circuit board layout with no visible text, numbers, or symbols.

A.6 BOARD - BOTTOM COPPER

Abstract geometric pattern with blue circles and dots on a teal background, no text or symbols present

A.7 BOARD - BOTTOM COPPER AND SILK

Microscopic view of a circuit board layout with scattered blue and white circular components, no visible text or symbols

A.8 BOARD - BOTTOM SILK

Abstract geometric pattern with dark blue circles and teal squares arranged in a grid, no text or symbols present

A.9 BOARD - BOTTOM VIEW WITH HEATSINK HS1 MOUNTED

Green printed circuit board with HS1 chip and connector components (no readable text or symbols)

Appendix B. Bill of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty.	Reference	Description Manufacturer Part Number
1 C1	Capacitor, Ceramic, 4700 pF, 50V, 10%, X7R, SMD, 0603		KEMET C0603C472K5	RACTU
1 C2	Do Not Populate - Capacitor, Ceramic, 10 pF, 50V, 0.5 pF, C0G, SMD, 0603		TDK Corporation C1608	C0G1H100D
1 C3	Capacitor, Ceramic, 0.010 μF, 25V, 10%, X7R, SMD, 0603		Yageo Corporation	CC0603KRX7R8BB103
2 C4,	C8 Capacitor, Ceramic, 2.2 μF, 16V, 10%, X5R, SMD, 0603		TDK Corporation C1608	X5R1C225K
1 C5	Capacitor, Ceramic, 1 μF, 100V, 10%, X7S, SMD, 0805		TDK Corporation C2012	X7S2A105K125AB
3 C7,	C10, C17	Capacitor, Ceramic, 0.1 μF, 100V, 10%, X7R, SMD, 0603	Murata Electronics® North America, Inc.	GRM188R72A104KA35D
1 C9	Capacitor, Ceramic, 4.7 μF, 25V, 10%, X5R, SMD, 0805		Murata Electronics North America, Inc.	GRM21BR61E475KA12L
1 C11	Do Not Populate - Capacitor Ceramic, 1000 pF, 50V, 20%, X7R, SMD, 0603		Panasonic® - ECG	ECJ-1VB1H102K
3	C12, C13, C14	Capacitor, Ceramic, 47 μF, 16V, 20%, X5R, SMD, 1210	Yageo Corporation	CC1210MKX5R7BB476
1 C15	Capacitor, Aluminum, 1000 μF, 16V, 20%, SMD, G		Panasonic - ECG	16SVPF1000M
1 C16	Capacitor, Ceramic, 0.1 μF, 16V, 10%, X7R, SMD, 0603		AVX Corporation	0603YC104KAT2A
4	C18, C19, C20, C21	Capacitor, Ceramic, 2.2 μF, 100V, 10%, X7R, SMD, 1210	KEMET C1210Cn225K1	RACTU
1 C22	Capacitor, Aluminum, 100 μF, 100V, 20%, TH, P5D12.5H20		United Chemi-Con	EKZE101ELL101MK16S
9 J1,	J2, J3, J4, J7, J8, J9, J11, J12	Connector, Header-2.54 Male, 1x2, Gold, 5.84MH, TH, VERT	FCI	77311-118-02LF
2 J5,	J6 Connector, Header-2.54 Male, 1x3, Gold, 5.84MH, TH, VERT		FCI	68000-103HLF
1 J10	Connector, Header-2.54 Male, 2x6, Gold, 5.84MH, TH, VERT		Samtec, Inc.	TSW-106-07-G-D
4 J13,	J14, J15, J16	Connector, Terminal, 15A, Female, 1x1, TH, Vertical	Keystone Electronics	8195
1	L1 (2)	Inductor, 6.8 μH, 21.5A, 20%, SMD, L11.6W10.5H8.8	Wurth Elektronik	74439369068

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.
2: The user can choose different values for the L1 inductor from the same recommended series, 74439369 from Wurth, according to their specific load requirements.

TABLE B-1: BILL OF MATERIALS (BOM) (CONTINUED)

Qty.	Reference	Description	Manufacturer	Part Number
1 PC	B1 ADM009	95 - Printed Circuit Board Microchip	Technology Inc.	04-10825-R1
1 R1	Resistor, TKF	100 kΩ, 5%, 1/10W, SMD, 0603, (Don't Use, Duplicate, Use RSMT0026)	Panasonic - ECG ERJ-3	GEYJ104V
1	R2	Resistor, TKF, 30 kΩ, 1%, 1/10W, SMD, 0603	Stackpole Electronics, Inc.	RMCF0603FT30K0
4 R3,	R4, R8, R10	Resistor, TF, 10 kΩ, 1%, 1/8W, SMD, 0603	Vishay Beyschlag	MCT06030C1002FP500
1	R7	Resistor, TKF, 20 kΩ, 1%, 1/10W, SMD, 0603	Panasonic - ECG	ERJ-3EKF2002V
1	R5	Resistor, TKF, 3.16 kΩ, 1%, 1/10W, SMD, 0603	Panasonic - ECG	ERJ-3EKF3161V
1	R6	Resistor, TKF, 2.2 kΩ, 1%, 1/10W, SMD, 0603	Panasonic - ECG	ERJ-3EKF2201V
1	R9	Resistor, TKF, 2R, 1%, 1/4W, SMD, 0603	Vishay/Dale	CRCW06032R00FKEAHP
1	R11	Resistor, TKF, 2.21 kΩ, 1%, 1/10W, SMD, 0603	Panasonic - ECG	ERJ-3EKF2211V
1	R12	Resistor, TKF, 0R, 1/10W, SMD, 0603	Panasonic - ECG	ERJ-3GSY0R00V
2	R13, R14	Resistor, TKF, 1R, 1%, 1/10W, SMD, 0603	Yageo Corporation	RC0603FR-071RL
1	R15	Resistor, TKF, 16.2 kΩ, 1%, 1/10W, SMD, 0603	Panasonic - ECG	ERJ-3EKF1622V
1	R16	Do Not Populate – Resistor, TKF, 1R, 1%, 1/10W, SMD, 0603	Yageo Corporation	RC0603FR-071RL
1	R17	Resistor, TKF, 49.9R, 1%, 1/10W, SMD, 0603	Panasonic - ECG	ERJ-3EKF49R9V
1	R18	Resistor, TKF, 1.37 kΩ, 1%, 1/10W, SMD, 0603	Yageo Corporation	RC0603FR-071K37L
1	R19	Resistor, TKF, 523R, 1%, 1/10W, SMD, 0603	Yageo Corporation	ERJ3EKF5230V
1	R20	Resistor, TKF, 15R, 1%, 1/16W, SMD, 0603	Stackpole Electronics, Inc.	RMCF0603FT15R0
1 U1	Microchip A	Analog Switcher Buck, 0.6V to 32V, 8A, MIC28517T-E/PHA VQFN-32	Microchip Technology, Inc.	MIC28517T-E/PHA

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.
2: The user can choose different values for the L1 inductor from the same recommended series, 74439369 from Wurth, according to their specific load requirements.

TABLE B-2: BILL OF MATERIALS (BOM) – MECHANICAL PARTS

Qty.	Reference	Description	Manufacturer	Part Number
1	HS1	Mechanical HW Heatsink, Adhesive Tape,L19W19H6.3	CTS Corporation APF	9-19-06CB/A01
1 JP1	Mechanical HW Jumper, 2.54 mm, 1x2, Handle Gold		TE Connectivity	881545-2
1	LABEL1	Label, AIPD Board Assembly	—	—
4 SCR1, SCR2,SCR3, SCR4		Mechanical HW Screw #6-32 x 1/4" PanHeadPHIL Nylon	B&FTM Fasteners Supply	NY PMS 632 0025 PH
4 STANDOFF1,STANDOFF2,STANDOFF3,STANDOFF4		Mechanical HW Stand-Off #6-32 x 3/8" F Hex Nylon	Keystone Electronics	1903B

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.

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