Microchip Technology MCP1633 SEPIC User manual

Brand: Microchip Technology

Model: MCP1633 SEPIC

Type: User manual

Microchip Technology MCP1633 SEPIC is a high-brightness LED driver tailored to boost the supply voltage from 12V to 58V. This enables the direct drive of high-brightness LEDs with improved efficiency compared to traditional boost or buck-boost topologies. MCP1633 SEPIC is a monolithic switching regulator that drives a single high-brightness LED string with currents up to 1.5A.

 2020 Microchip Technology Inc. DS50002945A

MCP1633 SEPIC

LED Driver

Demonstration Board

User’s Guide

DS50002945A-page 2  2020 Microchip Technology Inc.

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MCP1633 SEPIC

LED DRIVER

DEMONSTRATION BOARD

USER’S GUIDE

 2020 Microchip Technology Inc. DS50002945A-page 3

Table of Contents

Preface ........................................................................................................................... 5

Chapter 1. Product Overview ........................................................................................ 9

1.1 Introduction ..................................................................................................... 9

1.2 Board Features ............................................................................................... 9

1.3 Device Summary ............................................................................................ 9

1.4 Technical Specifications ............................................................................... 10

1.5 Functional Description .................................................................................. 11

1.6 What Does the MCP1633 Demonstration Board Kit Include? ...................... 11

Chapter 2. Installation and Operation ........................................................................ 13

2.1 Getting Started ............................................................................................. 13

2.1.1 Necessary Instruments and Tools ............................................................. 13

2.1.2 Setup Procedure ....................................................................................... 13

2.1.3 Board Testing ............................................................................................ 13

2.2 Evaluating the Application ............................................................................ 15

2.3 Firmware Description ................................................................................... 15

Appendix A. Schematic and Layouts ......................................................................... 17

A.1 Introduction .................................................................................................. 17

A.2 Board – Schematic ....................................................................................... 18

A.3 Board – Top Silk .......................................................................................... 19

A.4 Board – Top Copper and Silk ....................................................................... 19

A.5 Board – Top Copper .................................................................................... 20

A.6 Board – Bottom Cooper ............................................................................... 20

A.7 Board – Bottom Copper and Silk ................................................................. 21

A.8 Board – Bottom Silk ..................................................................................... 21

Appendix B. Bill of Materials (BOM)........................................................................... 23

Appendix C. Typical Performance Data, Curves and Waveforms ........................... 27

C.1 Introduction .................................................................................................. 27

C.2 Gate Drive (TP5) .......................................................................................... 27

C.3 Switch Node (TP4) ....................................................................................... 27

C.4 Output Current when Dimming is Active ...................................................... 28

C.5 Output Current and Voltage Ripple .............................................................. 28

Worldwide Sales and Service .................................................................................... 30

MCP1633 SEPIC LED Driver Demonstration Board User’s Guide

DS50002945A-page 4  2020 Microchip Technology Inc.

NOTES:

MCP1633 SEPIC

LED DRIVER

DEMONSTRATION BOARD

USER’S GUIDE

 2020 Microchip Technology Inc. DS50002945A-page 5

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the

MCP1633 SEPIC LED Driver Demonstration 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 MCP1633 SEPIC LED Driver Demonstration

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 MCP1633

SEPIC LED Driver Demonstration Board.

• Chapter 2. “Installation and Operation” – Includes instructions on setting up

the MCP1633 SEPIC LED Driver Demonstration Board.

• Appendix A. “Schematic and Layouts” – Shows the schematic and layout

diagrams for the MCP1633 SEPIC LED Driver Demonstration Board.

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

MCP1633 SEPIC LED Driver Demonstration Board.

• Appendix C. “Typical Performance Data, Curves and Waveforms” – Shows

the waveforms for the MCP1633 SEPIC LED Driver Demonstration Board.

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 “XXXXXXXX” is the document number and “A” is the revision level

of the document.

For the most up-to-date information on development tools, see the MPLAB

IDE online help.

Select the Help menu, and then Topics, to open a list of available online help files.

MCP1633 SEPIC LED Driver Demonstration Board User’s Guide

DS50002945A-page 6  2020 Microchip Technology Inc.

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

 2020 Microchip Technology Inc. DS50002945A-page 7

RECOMMENDED READING

This user’s guide describes how to use the MCP1633 SEPIC LED Driver

Demonstration Board. Another useful document is listed below. The following

Microchip document is available and recommended as a supplemental reference

resource:

MCP1633 Data Sheet – “Low-Side PWM Controller with LED Dimming

Capability” (DS20006289)

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

PRODUCT CHANGE NOTIFICATION SERVICE

Microchip’s customer notification service helps keep customers current on Microchip

products. Subscribers will receive e-mail notifications whenever there are changes,

updates, revisions or errata related to a specified product family or development tool of

interest.

To register, access the Microchip website at www.microchip.com, click on

Product Change Notification and follow the registration instructions.

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 A (January 2020)

• Initial release of this document.

MCP1633 SEPIC LED Driver Demonstration Board User’s Guide

DS50002945A-page 8  2020 Microchip Technology Inc.

NOTES:

MCP1633 SEPIC

LED DRIVER

DEMONSTRATION BOARD

USER’S GUIDE

 2020 Microchip Technology Inc. DS50002945A-page 9

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP1633 SEPIC LED Driver Demonstration Board is a step-up/step-down, Switch

mode, DC/DC converter used for LED driver applications. The MCP1633 SEPIC LED

Driver Demonstration Board provides a 200 mA constant-current source. Other output

current options can be obtained with minimum modifications to the board’s Bill of

Materials. The MCP1633 SEPIC LED Driver Demonstration Board utilizes the

MCP1633 high-speed Pulse-Width Modulator (PWM). The small MCP1633 16-pin

QFN device contains all the analog components necessary for a Peak Current mode

control loop, including specialized LED driver blocks. An 8-pin PIC12F1822

microcontroller is used to implement the dimming and protection functions.

1.2 BOARD FEATURES

The MCP1633 SEPIC LED Driver Demonstration Board has the following features:

• Compact size with high output power

• Operates in Buck mode (step down) or Boost mode (step up)

• Sustains voltage stresses (typically found in automotive products): 42V in for

180 ms

• High efficiency over entire operating input and output voltage ranges:

85% (typical)

• Typical output current: 200 mA (can be adjusted via hardware)

• Factory programmed source code provider

• Additional application functions can be implemented in the firmware

1.3 DEVICE SUMMARY

The MCP1633 SEPIC LED Driver Demonstration Board uses the following primary

devices on the board:

• MCP1633 High-Speed PWM Controller: When used in conjunction with the

microcontroller, the MCP1633 device controls the power system duty cycle in

order to provide output current and/or voltage regulation.

• PIC12F1822 Microcontroller (8-bit MCU): Used to implement the dimming

function, manage the Faults and protect the on-board load from overheating.

• MCP1790 Low-Dropout (LDO) Regulator: Used to supply regulated voltage (+5V)

to the PIC12F1822 microcontroller, the MCP1633 PWM controller and the

MCP9700 temperature sensor. The MCP1790 device can deliver 70 mA and

sustain +48V on input for 180 ms (30-second repetition rate).

• MCP9700 Low-Power Voltage Output Temperature Sensor: Used to measure the

LED temperature.

MCP1633 SEPIC LED Driver Demonstration Board User’s Guide

DS50002945A-page 10  2020 Microchip Technology Inc.

1.4 TECHNICAL SPECIFICATIONS

• Input voltage: +7V to +18V (surge voltage 42V for a maximum 180 ms,

30-second repetition rate)

• Undervoltage lockout circuit, software configurable (7V and 18V default

thresholds)

• Overvoltage lockout circuit, hardware configurable (16V default thresholds)

• Load disconnect protection

• Typical output current: 200 mA (with hardware adjustments)

• Maximum output current: 1500 mA

• Fully protected against short-circuit and no load conditions

Figure 1-1 shows a simplified block diagram of the application.

FIGURE 1-1: MCP1633 LED Driver Block Diagram.

MCP1633

OUT

SS/V

REF

COMP

EN/SYNC

EXT

PGND

fsw

Fsw

DIMM

IPO

ipo

IOUT

OVP

SDRV

ISP

ISN

FAULT

LDO

L1A

L1B

SLOPE

SENSE

fbT

fbB

OUT

LED

String

DIMMING

PIC12F1822

MCP9700

FAULT

DIMMING

FAULT

INDICATOR

Product Overview

 2020 Microchip Technology Inc. DS50002945A-page 11

1.5 FUNCTIONAL DESCRIPTION

The MCP1633 device provides all the analog functions necessary to implement a

stand-alone LED driver. When combined with an external microcontroller, the

MCP1633 device can be used to implement different intelligent converters, similar to

those necessary for LED drivers.

The power train of this application uses the Single-Ended Primary Inductor Converter

(SEPIC) topology.

The converter provides constant current with limited voltage at the output, necessary

for LED driver applications. The average current in the L1B inductor, which is also the

output current of the converter, is sensed using a 0.1 shunt resistor (RS). As the

voltage across the shunt resistor is negative, the internal amplifier is set to -10x gain

and the output is connected to the FB pin. The conversion gain of this circuit is 1V/A.

The output current is set by R

VREF

Output current can be calculated with Equation 1-1.

EQUATION 1-1:

1.6 WHAT DOES THE MCP1633 DEMONSTRATION BOARD KIT INCLUDE?

The MCP1633 Demonstration Board kit includes:

• MCP1633 SEPIC LED Driver Demonstration Board (ADM01002)

• Important Information Sheet

OUT

REF



R2 R1







Where:

REF

OUT RS

R2 R1 200 mV==

VREF

REF

50 A 4 k==

MCP1633 SEPIC LED Driver Demonstration Board User’s Guide

DS50002945A-page 12  2020 Microchip Technology Inc.

NOTES:

MCP1633 SEPIC

LED DRIVER

DEMONSTRATION BOARD

USER’S GUIDE

 2020 Microchip Technology Inc. DS50002945A-page 13

Chapter 2. Installation and Operation

2.1 GETTING STARTED

The MCP1633 SEPIC LED Driver Demonstration Board is fully assembled and tested.

The board requires the use of an external input voltage source (+7V to +18V) and the

LED load (provided).

2.1.1 Necessary Instruments and Tools

• Adjustable DC power supply with 0V-24V/3 ADC range output capability

• Digital oscilloscope with a minimum bandwidth of 50 MHz

• Signal generator

• Digital voltmeter/ammeter

• Wires for connections

2.1.2 Setup Procedure

To operate the board, follow the next steps:

1. Connect a power supply to the input connector J; the positive (+) and negative

(-) connector pins are marked on the board’s silkscreen.

2. Attach the jumper to the load connector in order to connect the LED from the

bottom side.

3. Connect the jumper on the INT position to use the local dimming signal (provided

by the PIC12F1822 microcontroller).

4. The DC voltage supplied by the adjustable DC power supply must be between

7V and 18V.

5. Turn on the power supply.

6. Rotate the potentiometer R25 to adjust the dimming level from 10-100%.

2.1.3 Board Testing

Figure 2-1 shows the typical testing setup. Tab l e 2- 1 shows all the available test points

on the MCP1633 SEPIC LED Driver Demonstration Board.

Various instruments can be connected at the listed test points to evaluate the

parameters of the converter. The typical performance data, curves and waveforms are

presented in Appendix C. “Typical Performance Data, Curves and Waveforms”.

MCP1633 SEPIC LED Driver Demonstration Board User’s Guide

DS50002945A-page 14  2020 Microchip Technology Inc.

FIGURE 2-1: Typical Test Setup.

TABLE 2-1: TEST POINT DESCRIPTION

Test Point Label Description

TP1 V

Input Voltage

TP2, TP9 GND Board GND

TP3 V

OUT

+ Converter’s Positive Output

TP4 SW Main Switch Node (drain of Q1 MOSFET)

TP5 DR MOSFET Drive Signal (pin 11 of MCP1633)

TP6 V

OUT

- Converter’s Negative Output

TP8 COMP Output of the Error Amplifier (pin 4 of MCP1633)

Installation and Operation

 2020 Microchip Technology Inc. DS50002945A-page 15

2.2 EVALUATING THE APPLICATION

The best way to evaluate the MCP1633 SEPIC LED Driver Demonstration Board is by

examining the circuit, measuring voltages and currents with a digital voltage meter, and

probing the board with an oscilloscope.

Additional tools are required to evaluate some of the board’s technical parameters (the

temperature of power components, the ability to withstand surge voltage pulse on input,

EMI).

The PIC12F1822 device’s firmware program can also be edited to modify the operation

of the application.

2.3 FIRMWARE DESCRIPTION

The PIC12F1822 device comes with preprogrammed firmware to operate the system.

The firmware is straightforward, with an initialization routine at the beginning of the pro-

gram. The TRISx register controls the data direction of the pins, and is configured to

set pulses for dimming and protection (RA5). The RA0, RA2 and RA4 pins are

configured as analog inputs, and are used to measure the input voltage, the dimming

level and the LED’s temperature.

The Capture/Compare/PWM (CCP) is configured for PWM mode operation and used

for PWM dimming of the LEDs. The PWM period can be calculated by writing to the

PR2 register. The PWM duty cycle is specified by writing to the CCPR1L register and

to the CCP1CON[5:4] bits. Up to 10-bit resolution is available. The CCPR1L contains

the eight MSbs (Most Significant bits) and the CCP1CON[5:4] bits contains the

two LSbs (Least Significant bits). This 10-bit value is represented by

CCPR1L:CCP1CON[5:4]. The switching frequency is set to 1 kHz. The duty cycle is

modified by reading the input from a potentiometer with an ADC module on Channel 2.

The ADC module must have a 10-bit resolution.

The reference voltage for MCP1633 is produced by R

VREF

. This allows the user to

adjust the LED’s intensity by changing it (dimming).

The internal ADC is used to monitor the input voltage. If the input voltage is too low or

too high, the board is set in “Power Off” condition.

The “No Load” condition protection is provided by the FAULT

pin of the MCP1633

device and is handled by the PIC12F1822 microcontroller. If the output voltage is too

high and the overvoltage threshold is reached, the FAULT

pin goes low as the interrupt

occurs, the PWM is disabled and the DIMM pin is set to ‘0’. A timer starts counting, and

if no Fault conditions occur after two seconds, the converter starts working normally.

The PIC12F1822 microcontroller also handles the overtemperature protection. If the

LED’s temperature is between +60°C and +80°C, a 50% dimming occurs. Until the

temperature drops to +50°C, the intensity can be adjusted between 10% and the value

at which the 50% dimming occurred. If the temperature continues to rise and exceeds

+80°C, the LED will be turned off until it cools down to +50°C.

MCP1633 SEPIC LED Driver Demonstration Board User’s Guide

DS50002945A-page 16  2020 Microchip Technology Inc.

FIGURE 2-2: State Machine Description.

Start

Check Input

Voltage

Good

Check Fault

High

Check DIMM Level

(potentiometer)

Check

Temperature

(60°-80°)

Set Dimming up to

50%

< 60°

Set PWM (duty)

> 80°

Set Dimming = 0%

LowNo Load Condition

Wait 2s

MCP1633 SEPIC

LED DRIVER

DEMONSTRATION BOARD

USER’S GUIDE

 2020 Microchip Technology Inc. DS50002945A-page 17

Appendix A. Schematic and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP1633 SEPIC

LED Driver Demonstration Board:

• Board – Schematic

• Board – Top Silk

• Board – Top Copper and Silk

• Board – Top Copper

• Board – Bottom Cooper

• Board – Bottom Copper and Silk

• Board – Bottom Silk

MCP1633 SEPIC LED Driver Demonstration Board User’s Guide

DS50002945A-page 18  2020 Microchip Technology Inc.

A.2 BOARD – SCHEMATIC

OUT

GND

GND GND

GND

10 nF

50V

0603

C13

GND GND

10 μF

50V

1210

GND

GND GND

10 μF

50V

1210

GNDGND

GND

10 μF

50V

1210

GND

TP1

TP2

TP3

TERMINAL 1x2

GNDGND

TP6

GND

10 μF

50V

1210

GND

RA5

RA4

RA3/MCLR/V

RA2

RA1 /ICSPCLK

RA0/ICSPDAT

PIC12F1822

GND

10k

R25

GND GND

100k

0603

100k

0603

R10

100k

0603

220R

0603

R18

R13

R20

10k

0603

R12

10R

0603

R19

0.1R

1206

1 μF

25V

0805

33 pF

50V

0603

C12

47 pF

50V

0603

C14

1 μF

25V

0805

C17

10 μF

50V

1210

GND

R14

R21

20k

0603

R22

20k

0603

R23

GND

RED

0603

R26

GND

10 nF

50V

0603

C10

GND

0603

4.7R

GND

in_temp

100 pF

C18

GND

SDRV

ISN+

ISN-

ISN+

ISN-

OVP

in_temp

dimming_duty_cycle

dimming_duty_cycleCLK

DAT

CLK

DAT

CLK

LOCAL_DIMMING

LD1

LD2

LD3

LD4

LD5

TP5

TP4

TP8

1 μF

50V

0805

1 μF

50V

0805

4.7 μF

25V

0805

0.1 μF

16V

0603

C15

RBR2LAM60BTF

1,2,3

5,6,7,8

SI4850EY

HDR-2.54 Male 1x6

240k

0603

TP9

GND

EN/SYNC

DIMM

GND

OUT

MCP9700A

0.1 μF

16V

0603

C20

GND

33 μF

50V

C19

GND

Rubber Pad Cyl D7.9H5.3

PAD2

Rubber Pad Cyl D7.9H5.3

PAD3

Rubber Pad Cyl D7.9H5.3

PAD4

Rubber Pad Cyl D7.9H5.3

PAD1

FAULT

SS/REF

COMP

IPO

DIMM

EXT

SDRV

ISN-

ISN+

IOUT

OVP

AGND

FAULT

MCP1633

4.7k

0603

R27

24k

0603

R24

GND

DAT

1,2,3

5,6,7,8

SQ7414AENW

GND

LOCAL_DIMMING

EXT_DIMMING

GND

EXT_DIMMING

20k

0603

R11

51k

0603

R16

4.02k

0603

R17

0.22R

1206

R15

22 μH

L1A

22 μH

L1B

1000 pF

50V

0603

C11

1000 pF

50V

0603

C16

Shunt 2.54 mm 1x2

JP1

Shunt 2.54 mm 1x2

JP2

Shunt 2.54 mm 1x2

JP3

Schematic and Layouts

 2020 Microchip Technology Inc. DS50002945A-page 19

A.3 BOARD – TOP SILK

A.4 BOARD – TOP COPPER AND SILK

MCP1633 SEPIC LED Driver Demonstration Board User’s Guide

DS50002945A-page 20  2020 Microchip Technology Inc.

A.5 BOARD – TOP COPPER

A.6 BOARD – BOTTOM COOPER

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Microchip Technology MCP1633 SEPIC User manual

Microchip Technology MCP1633 SEPIC User manual

Microchip Technology MCP1633 SEPIC User manual

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