Microchip Technology TC64X Manuale utente

2003 Microchip Technology Inc. DS21401C

TC64X/TC64XB Fan Control

Demo Board User’s Guide

DS21401C-page ii 2003 Microchip Technology Inc.

Information contained in this publication regarding device

applications and the like is intended through suggestion only

and may be superseded by updates. It is your responsibility to

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• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data

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• Microchip is willing to work with the customer who is concerned about the integrity of their code.

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Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

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The Company’s quality system processes and

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MTC64X/TC64XB FAN CONTROL

DEMO BOARD USER’S GUIDE

2003 Microchip Technology Inc. DS21401C-page iii

Table of Contents

Chapter 1. General Information

1.1 Introduction ..................................................................................................... 1

1.2 TC64X/TC64XB Fan Control Demo Board ..................................................... 2

1.3 Reference Documents .................................................................................... 4

Chapter 2. Getting Started

2.1 TC64X/TC64XB Fan Control Demo Board

Typical Module Configurations ....................................................................... 5

2.2 System Connection For +5V Operation .......................................................... 6

Appendix A. Board Layout and Schematic

A.1 Introduction ..................................................................................................... 7

A.2 Board Layout and Schematic ......................................................................... 7

Appendix B. Bill-of-Materials (BOM)

B.1 Demo Board Components ............................................................................. 9

Worldwide Sales and Service ............................................................................................. 10

TC64X/TC64XB Fan Control Demo Board User’s Guide

DS21401C-page iv 2003 Microchip Technology Inc.

NOTES:

MTC64X/TC64XB FAN CONTROL

DEMO BOARD USER’S GUIDE

2003 Microchip Technology Inc. DS21401C-page 1

Chapter 1. General Information

1.1 INTRODUCTION

Thank you for purchasing the TC64X/TC64XB Fan Control Demo Board from

Microchip Technology Inc. The TC64X/TC64XB Fan Control Demo Board allows the

user to quickly prototype fan control circuits based on Microchip’s pulse width

modulation (PWM) Fan Control integrated circuits.

These devices will be referred to as TC64X in this document:

•TC642

•TC646

•TC647

•TC648

•TC649

These devices will be referred to as TC64XB in this document:

•TC642B

•TC646B

•TC647B

•TC648B

•TC649B

A versatile sensor input and output driver circuitry allows the Fan Control Module to be

used with virtually any brushless DC fan and standard thermistor. An optional LED

status indicator gives a visual indication of a fan fault (stalled, open or unconnected fan)

or an overtemperature condition.

The TC64X/TC64XB Fan Control Demo Board has the following features:

1. Complete implementation of TC64X or TC64XB fan control circuitry on a

1.5" x 2.0" board

2. Works with standard thermistors

3. Temperature-proportional fan speed control

4. Overtemperature fault detection

5. Fan fault detection

6. Installs directly into user's end equipment

7. Speeds up prototyping, system development and system thermal

characterization

TC64X/TC64XB Fan Control Demo Board User’s Guide

DS21401C-page 2 2003 Microchip Technology Inc.

1.2 THE TC64X/TC64XB FAN CONTROL DEMO BOARD

The TC64X/TC64XB Fan Control Demo Board (Figure 1-1) measures only 1.5” x 2.0”,

allowing direct installation to the user’s end equipment for system evaluation. It uses

through-hole components for easy assembly and evaluation.

The kit is shipped with the following items:

1. TC64X/TC64XB Fan Control Demo Board

2. Demo and Evaluation Kit Software and Documentation CD, DS51306

The CDROM contains:

• Device Data Sheets

• TC64X/TC64XB Fan Control Demo Board User’s Guide, DS21401

3. Sample Devices:

The components that are populated on the TC64X/TC64XB Fan Control Demo Board

are listed in Table B-1 of the Appendix B section. If any component is damaged or

missing, please contact your nearest Microchip sales office, listed on the back of this

publication.

Device

Part Number

PDIP SOIC

TC642B TC642BEPA TC642BEOA

TC646B TC646BEPA TC646BEOA

TC647 TC647VPA TC647VOA

TC647B TC647BEPA TC647BEOA

TC648 TC648VPA TC648VOA

TC648B TC648BEPA TC648BEOA

TC649 TC649VPA TC649VOA

TC649B TC649BEPA TC649BEOA

General Information

2003 Microchip Technology Inc. DS21401C-page 3

1.3 REFERENCE DOCUMENTS

The following is recommended reading:

•Technical Library CD-ROM, DS00161

•Analog & Interface Families Data Book 2002, DS00207

•2002 Technical Documentation Analog & Interface Product Families CD-ROM,

DS51205

• AN768, “Redundant Fan Systems Using the TC642 Fan Manager”, DS00768,

Microchip Technology Inc., 2002

• AN770, “Linear Voltage Fan Speed Control Using Microchip’s TC64X Family”,

DS00770, Microchip Technology Inc., 2003

• AN771, “Suppressing Acoustic Noise in Pulse Width Modulation (PWM) Fan

Speed Control Systems”, DS00771, Microchip Technology Inc., 2003

• AN772, “Speed Error in Pulse Width Modulation (PWM) Fan Control Systems”,

DS00772, Microchip Technology Inc., 2003

TC642 Fan Speed Control Module for TC64X Family Sell Sheet, DS51251

Other Reference Documents may be obtained by contacting your nearest Microchip

sales office (listed on the back of this document).

The Microchip web site (www/microchip.com) also contains a wealth of documentation.

Individual data sheets, application notes, tutorials and user’s guides are all available

for easy download.

TC64X/TC64XB Fan Control Demo Board User’s Guide

DS21401C-page 4 2003 Microchip Technology Inc.

NOTES:

MTC64X/TC64XB FAN CONTROL

DEMO BOARD USER’S GUIDE

2003 Microchip Technology Inc. DS21401C-page 5

Chapter 2. Getting Started

This chapter describes the TC64X/TC64XB Fan Control Demo Board’s configuration,

how it functions and lists typical fan demo board operating configurations for fan

applications.

2.1 TC64X/TC64XB FAN CONTROL DEMO BOARD TYPICAL MODULE

CONFIGURATIONS

2.1.1 Using Bipolar Driver Transistors

All component selections should be made based on the information provided in the

Applications section of the TC64X and TC64XB data sheets. Table 2-1 lists typical fan

module operating configurations for 12V fan applications. These are provided as a

guide only. The values in the table assume the use of low-cost, bipolar transistors, such

as 2N2222A, unless stated otherwise.

TABLE 2-1: SUGGESTED OUTPUT DRIVER/CURRENT SENSE VALUES

VS. FAN CURRENT

Fan motors of 50 mA to 150 mA can be driven using the single transistor driver

configuration (i.e., Q3installed; Q1and Q2not installed). Fans having a motor current

of 200 mA may be driven using either the single transistor or Darlington configurations.

If a single transistor is used, care must be taken to select a transistor having a minimum

hFE of at least 50 to ensure the minimum output current specification (5 mA) of the

TC64X and TC64XB devices is sufficient to saturate the transistor when it is conducting

the full fan current.

Full Speed

Fan Current

Darlington Pair

(Q1, Q2)

Single Transistor

(Q3)

(Ω)

50 mA — X 2.4 k 9.1

100 mA — X 1.1 k 4.7

150 mA — X 750 3.0

200 mA — X 620 2.4

200 mA X — 5.6 k 2.4

250 mA X — 4.7 k 2.0

300 mA X — 3.9 k 1.8

350 mA X — 3.3 k 1.5

400 mA X — 3.0 k 1.3

450 mA X — 2.4 k 1.2

TC64X/TC64XB Fan Control Demo Board User’s Guide

DS21401C-page 6 2003 Microchip Technology Inc.

2.1.2 Using Logic Level MOSFETS

Substituting a logic level MOSFET for Q3(such as a BS170) results in lower system

voltage losses and significantly reduces output loading on the TC64X and TC64XB

devices. The low RDSON of the MOSFET (1Ωin the case of the BS170) enables it to be

used instead of the Darlington configuration in high-current fan applications. Refer to

the Applications section of the TC64X and TC64XB data sheets for details.

Population options for single transistor output drivers (using either MOSFET or bipolar

transistor) and the two transistor (Darlington) stage are shown in Figure 2-1.

FIGURE 2-1: Output Driver Configuration Options

2.2 SYSTEM CONNECTION FOR +5V OPERATION

Figure 2-2 shows typical wiring connections to the fan control module. The fan

operating voltage is +12V, while the fan control module operates from a supply voltage

of +5V. A NTC thermistor connects from the SENSOR input of the fan control module

to VDD. Fan control module resistors R1and R2(See Figure A-2), in conjunction with

characteristics of the NTC thermistor, determine the fan speed versus the temperature

profile of the system.

FIGURE 2-2: Typical Wiring Connections to Fan Module for +12V Fan and +5V Module Supply

Reverse Orientation of

Q3and Jumper R5

Q1R5

7R5

To Fan (–)

Jumper

Q3(BS170)

Q1, Q2= 2N2222A

7R5

To F an ( – ) To F a n ( – )

Q3(2N2222A)

VDD

TC64X/TC64XB

Demo

Fan Control

Module

Power Supply

SENSOR

VAS/VMIN

FAULT

System

Shutdown

NTC

Thermistor

Fan

FAN(–)

GND

+5V

+12V

GND +

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