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2018 Microchip Technology Inc. DS50002785A

MAQ3203 High Brightness LED Driver Evaluation Board

User’s Guide

DS50002785A-page 2 2018 Microchip Technology Inc.

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The Microchip name and logo, the Microchip logo, AnyRate, AVR, AVR logo, AVR Freaks, BitCloud, chipKIT, chipKIT logo, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, Heldo, JukeBlox, KeeLoq, Kleer, LANCheck, LINK MD, maXStylus, maXTouch, MediaLB, megaAVR, MOST, MOST logo, MPLAB, OptoLyzer, PIC, picoPower, PICSTART, PIC32 logo, Prochip Designer, QTouch, SAM-BA, SpyNIC, SST, SST Logo, SuperFlash, tinyAVR, UNI/O, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

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All other trademarks mentioned herein are property of their respective companies.

© 2018, Microchip Technology Incorporated, All Rights Reserved.

ISBN: 978-1-5224-3356-9

MAQ3203 EVALUATION KIT USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 5Introduction............................................................................................................ 5

Document Layout .................................................................................................. 5

Conventions Used in this Guide ............................................................................ 6

Recommended Reading........................................................................................ 7

The Microchip Website.......................................................................................... 7

Customer Support ................................................................................................. 7

Document Revision History ................................................................................... 7

Chapter 1. Product Overview1.1 Introduction ..................................................................................................... 91.2 MAQ3203 High Brightness LED Driver Evaluation Board Overview .............. 91.3 MAQ3203 High Brightness LED Driver Evaluation Board Features ............. 101.4 What the MAQ3203 High Brightness LED Driver Evaluation Board Kit Contains

10

Chapter 2. Installation and Operation2.1 System and Configuration Requirements ..................................................... 112.2 Board Setup ................................................................................................. 112.3 Circuit Description ........................................................................................ 12

Appendix A. Schematics and LayoutsA.1 Introduction .................................................................................................. 15A.2 Board – Schematic ....................................................................................... 16A.3 Board – Top Silk .......................................................................................... 17A.4 Board – Top Copper and Silk ....................................................................... 18A.5 Board – Top Copper .................................................................................... 19A.6 Board – Bottom Copper ............................................................................... 20A.7 Board – Bottom Copper and Silk ................................................................. 21

Appendix B. Bill of Materials (BOM)

Worldwide Sales and Service .................................................................................... 25

2017 Microchip Technology Inc. DS50002785A-page 3

MAQ3203 Evaluation Kit 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 “DSXXXXXXXA”, where “XXXXXXX” 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 MAQ3203 Evaluation Kit. 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 MAQ3203 Evaluation Kit as a demonstration board to evaluate the MAQ3203 device. The manual layout is as follows:

• Chapter 1. “Product Overview” – Provides important information about the MAQ3203 Evaluation Kit.

• Chapter 2. “Installation and Operation” – Includes a detailed description of the demo board and instructions on how to use it.

• Appendix A. “Schematic and Layouts” – Schematic and layout diagrams of the MAQ3203 Evaluation Kit.

• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the MAQ3203 Evaluation Kit.



CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books 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 <Enter>, <F1>

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 -Opa+, -Opa-

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 mcc18 [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) ...


Preface

RECOMMENDED READING

This user's guide describes how to use MAQ3203 Evaluation Kit. The following Microchip document is available and recommended as a supplemental reference resource:

• MAQ3203 Data Sheet - “High-Brightness LED Driver Controller with High-Side Current Sense”

This data sheet provides detailed information regarding the MAQ3203 device.

THE MICROCHIP WEBSITE

Microchip provides on-line support via our web site 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, on-line 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 A (July 2018)

• Initial release of the MAQ3203 High Brightness LED Driver Evaluation Board User’s Guide, DS50002785A.


http://support.microchip.com

www.microchip.com


NOTES:



Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the MAQ3203 High Brightness LED Driver Evaluation Board and covers the following topics:

• “MAQ3203 High Brightness LED Driver Evaluation Board Overview”

• “MAQ3203 High Brightness LED Driver Evaluation Board Features”

• “What the MAQ3203 High Brightness LED Driver Evaluation Board Kit Con-tains”

1.2 MAQ3203 HIGH BRIGHTNESS LED DRIVER EVALUATION BOARD OVERVIEW

The MAQ3203 High Brightness LED Driver Evaluation Board is a hysteretic step-down, constant-current, high-brightness LED (HB LED) driver solution. It provides an ideal solution for interior/exterior lighting, architectural and ambient lighting, LED bulbs, and other general illumination applications.

This board enables the evaluation of the MAQ3203 for 1A LED current. The MAQ3203 operates from a 4.5V to 42V input voltage range and controls an external power MOS-FET to drive high current LEDs. When the internal 5V VCC is regulated, the external MOSFET is turned on if the EN pin and DIM pin are high. The inductor current builds up linearly. When the CS pin voltage hits the VCS(MAX) with respect to VIN, the external MOSFET is turned off, the Schottky diode takes over, and returns the current to VIN. Then, the current through inductor and LEDs starts decreasing. When the CS pin hits VCS(MIN), the external MOSFET is turned on and the cycle repeats.

Because the control scheme does not need loop compensation, it makes for a very simple design and avoids problems of instability.

FIGURE 1-1: MAQ3203 High Brightness LED Driver Evaluation Board.



1.3 MAQ3203 HIGH BRIGHTNESS LED DRIVER EVALUATION BOARD FEATURES

The MAQ3203 High Brightness LED Driver Evaluation Board:

• AEC-Q100 Qualified

• High Efficiency (>90%)

• ±5% LED Current Accuracy

• Features a Dedicated Dimming Control Input (DIM) that Can be Used to Dim the LED Brightness by a PWM Signal

• Features a Logic Level Enable (EN) that Can be Used to Enable or Disable the LED Driver

• Frequency Dither for Low EMI

• Adjustable Constant LED Current

• Hysteretic Control

• Overtemperature Protection

The basic parameters of the evaluation board are:

• Input: 4.5V to 42V

• Output: 1A LED Current with up to 10 LEDs in Series across LED+ (J3) and LED– (J4)

• Up to 1.5 MHz Switching Frequency

• PWM Dimming Signal: Frequency up to 20 kHz, Duty Cycle from 1% to 99%

1.4 WHAT THE MAQ3203 HIGH BRIGHTNESS LED DRIVER EVALUATION BOARD KIT CONTAINS

The MAQ3203 High Brightness LED Driver Evaluation Board kit includes the following items:

• MAQ3203 High Brightness LED Driver Evaluation Board (ADM00940)

• Important Information Sheet



Chapter 2. Installation and Operation

2.1 SYSTEM AND CONFIGURATION REQUIREMENTS

The MAQ3203 High Brightness LED Driver Evaluation Board requires a single bench power source adjustable over the input voltage of 4.5V ≤ VIN ≤ 42V that can provide at least 1A of current. The loads can either be active (electronic load) or passive (LEDs) with the ability to dissipate the maximum load power while keeping accessible surfaces ideally <70°C.

Note: The MAQ3203 High Brightness LED Driver Evaluation Board does not has reverse input polarity protection. Applying a negative voltage across the VIN and GND terminals may damage the device. When connecting the input source, ensure that the correct polarity is observed. Under extreme load con-ditions input transients can be quite large if long test leads are used. In such cases a 100 µF, 63V electrolytic capacitor is needed at the VIN terminals to prevent overvoltage damage to the IC. The maximum VIN of the board is rated at 42V. Exceeding 42V on VIN could damage the device.

2.2 BOARD SETUP

Follow these steps before using the MAQ3203 High Brightness LED Driver Evaluation Board:

1. Connect the VIN supply to the input terminals VIN and GND. With the output of this supply disabled, set its voltage to the desired input test voltage (4.5V < VIN < 42V). This supply voltage should be monitored at the evaluation board’s input terminals to allow voltage drops in the test cables (and ammeter if used) to be accounted for. An ammeter can be added in-line with the VIN input terminal to accurately measure input current.

2. Connect the LEDs to the output terminals between LED+ and LED–. The LED voltage drop across the LED+ and LED– terminals depends on manufacturer tol-erance and number of LEDs. The LED current can be measured using an amme-ter or current probe. A 4.7 µF ceramic capacitor helps to reduce the current ripple through the LED. The LED current is set to 1A by current sense resistor R1 (i.e., 200 mΩ). In selecting the sense resistor, please refer to the table given in the MAQ3203 data sheet’s Application Information section.

3. Enable the input supply. By default, the LED driver is enabled when the input volt-age exceeds the UVLO threshold and crosses 5V. The internal 5V VCC is regu-lated and the external MOSFET is turned on if the EN pin and DIM pin are high. To use the EN and DIM functions of the MAQ3203, both input terminals and con-nectors are provided for each pin.

4. Enable input. An EN connector (J13) 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 down the MAQ3203 High Brightness LED Driver Evaluation Board.

5. Dimming input. A DIM connector (J11) is provided on the evaluation board for users to easily access the dimming feature. Applying an external PWM signal with a duty cycle between 1% to 99% and frequency up to 20 kHz on the DIM pin can dim the brightness of the LEDs from the preset maximum brightness.



2.3 CIRCUIT DESCRIPTION

This section describes the working principles and limitations that should be taken into account when using the MAQ3203 High Brightness LED Driver Evaluation Board. The external components have been selected in order to optimize performance for the spe-cific operating conditions of 4.5V ≤ VIN ≤ 42V and maximum ILED = 1A. Although the application will behave correctly for other output currents and voltages, further optimi-zation (fine-tuning of inductor, output capacitor, input capacitors, and current sense resistor) can be done in order to improve efficiency and transient response.

2.3.1 EN Input

The MAQ3203 features an EN pin which provides a logic level control of the output and the voltage has to be 2.0V or higher to enable the current regulator. The output stage is gated by the DIM pin. When the EN pin is pulled low, the regulator goes into off state and the supply current of the device is reduced to below 1 µA. In the off state, the output drive is placed in a "tri-state" condition, where the MOSFET is in an “off” or non-con-ducting state. Do not drive the EN pin above the supply voltage. In this evaluation board, the EN pin is pulled high to the VIN supply voltage through a 100 kΩ resistor in default setting, the MAQ3203 is enabled by default. To disable the MAQ3203, set a jumper shunt across J13.

2.3.2 DIM Input

The MAQ3203 features a DIM pin that provides a logic level control for brightness of the LED. A PWM signal applied across the DIM terminal (J5) and GND terminal (J7), or across J11, can be used to reduce the brightness of LED from the maximum bright-ness and LED current set by the R1. DIM high enables the output and its voltage has to be 2.0V or higher. DIM low disables the output, regardless of EN high state. The maximum frequency of the applied dimming PWM signal is 20 kHz.

2.3.3 Current Sense Input

The MAQ3203 features a CS pin that provides the high-side current sense to set the LED current at 100% brightness with an external sense resistor. A sense resistor R1 is placed between the VIN and LED+ terminals. The current flowing through the LEDs is sensed and its current feedback is provided to the hysteretic step-down regulator. The output current at full brightness can be programmed by the value of R1 according to Equation 2-1.

EQUATION 2-1:

R112---

VCS MAX VCS MIN +

ILED--------------------------------------------------------- =

Where:ILED = LED current required to be set (at full brightness when no PWM dimming).VCS(MAX) = Current sense upper threshold, refer to the Electrical Characteristics Table in the MAQ3203 data sheet.VCS(MIN) = Current sense lower threshold, refer to the Electrical Characteristics Table in the MAQ3203 data sheet.

2.3.4 Switching Node

Test point J12 (TP_SW) is placed for monitoring the switching waveform, one of the most critical waveforms for the switching regulator.


2.3.5 Switching Frequency and Inductance Value

The operating frequency of the MAQ3203 should be no higher than 1.5 MHz. The fre-quency spreading across input supply and the required inductance value can be esti-mated by Equation 2-2 and Equation 2-4.

EQUATION 2-2:

fSWVD ILED+ R1 VLED+ VIN ILED– R1 VLED–

L IL VD VIN+ ------------------------------------------------------------------------------------------------------------------------------------------=

Where:VD = Schottky diode forward drop.VLED = Total voltage drop of the LEDs.VIN = Input voltage.ILED = LED current at full brightness (when no PWM dimming).∆IL = Inductor current ripple.R1 = Current sense resistor resistance.

Use Equation 2-3 to calculate the inductor current ripple.

EQUATION 2-3:

ILVCS MAX VCS MIN –

R1--------------------------------------------------------=

EQUATION 2-4:

LVD ILED+ R1 VLED+ VIN ILED– R1 VLED–

fSW IL VD VIN+ ------------------------------------------------------------------------------------------------------------------------------------------=

According to Equation 2-4, choose the inductor to make the operating frequency no higher than 1.5 MHz.

Refer to the Application Information section of the MAQ3203 data sheet for more infor-mation on components selection guidelines.

2.3.6 Frequency Dithering

The MAQ3203 is designed to modulate the VCS(MAX) with amplitude ±6 mV by a pseudo random generator to generate the ±12% of the switching frequency dithering to spread the frequency spectrum over a wider range and reduce the EMI noise peaks.



NOTES:



Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematic and layouts for the MAQ3203 High Brightness LED Driver Evaluation Board:

• Board – Schematic

• Board – Top Silk

• Board – Top Copper and Silk

• Board – Top Copper

• Board – Bottom Copper

• Board – Bottom Copper and Silk


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A.2 BOARD – SCHEMATIC

A.3 BOARD – TOP SILK



DS

A.4 BOARD – TOP COPPER AND SILK

50002785A-page 18 2017 Microchip Technology Inc.

A.5 BOARD – TOP COPPER



DS

A.6 BOARD – BOTTOM COPPER

50002785A-page 20 2017 Microchip Technology Inc.

A.7 BOARD – BOTTOM COPPER AND SILK



NOTES:



Appendix B. Bill of Materials (BOM)

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

Qty. Reference Description Manufacturer Part Number

5 C1, C2, C5, C6, C7

CAP CER 4.7 µF 50V 10% X7R SMD 1210 Taiyo Yuden UMK325B7475KM-T

1 C3 CAP CER 1 µF 25V 10% X7R SMD 0805 AVX 08053C105K4Z2A

1 C4 CAP CER 270 pF 100V 5% C0G SMD 0805

Murata GRM2165C2A271JA01D

1 D1 DIO SCTKY SK36 60V 3A DO-214AB SMC

MCC SK36-TP

7 J1, J2, J3, J4, J5, J6, J7

CON TP PIN Tin TH Harwin H2121-01

6 J8, J9, J10, J11, J12, J13

CON HDR-2.54 Male 1x2 Gold 5.84 MH TH VERT

FCI 77311-118-02LF

1 L1 INDUCTOR 68 µH 1.3A 0.14R 20% SMD 10x10x4.5

TDK SLF10145T-680M1R2-PF

1 M1 TRANS FET N-CH 60V 12A 2.5W SOIC-8 ON Semiconductor FDS5672

1 PCB1 MAQ3203 High Brightness LED Driver Evaluation Board Printed Circuit Board

Microchip Technology Inc.

04-10833-R1

1 R1 RES SHUNT TKF 0.2R 1% 1/2W SMD 1206

Stackpole Electronics Inc.

CSR1206FKR200

2 R2, R3 RES TKF 100 kΩ 1% 1/8W SMD 0805 ROHM MCR10EZPF1003

1 R4 RES TKF 0R 1/16W SMD 0805 Stackpole Electronics Inc.

RMCF 1/10 0 R

1 R5 RES TKF 2.2R 1% 1/8W SMD 0805 AEC-Q200

Vishay Dale CRCW08052R20FKEA

1 R6 RES TKF 10 kΩ 1% 1/16W SMD 0805 Stackpole Electronics Inc.

RMCF0805FT10K0

1 U1 MAQ3203 High Brightness LED Driver Controller, SOIC-8 AEC-Q100

Microchip Technology Inc.

MAQ3203YM

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.

TABLE B-2: BILL OF MATERIALS (BOM) – DO NOT POPULATE PARTS


2 C6, C7 CAP CER 4.7 µF 50V 10% X7R SMD 1210 Taiyo Yuden UMK325B7475KM-T

1 C4 CAP CER 270 pF 100V 5% C0G SMD 0805

Murata GRM2165C2A271JA01D

1 R5 RES TKF 2.2R 1% 1/8W SMD 0805 AEC-Q200

Vishay Dale CRCW08052R20FKEA




TABLE B-3: BILL OF MATERIALS (BOM) – MECHANICAL PARTS


4 PAD1, PAD2, PAD3, PAD4

MECH HW RUBBER PAD CYLINDRICAL D7.9 H5.3 BLACK

3M SJ61A11




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Worldwide Sales and Service

10/25/17

http://support.microchip.com

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