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2003 Microchip Technology Inc. DS21403C
TC64X/TC64XB Fan Control
Evaluation Board User’s Guide
M
DS21403C-page ii 2003 Microchip Technology Inc.
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to the accuracy or use of such information, or infringement of
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M
TC64X/TC64XB FAN CONTROL
EVALUATION BOARD USER’S GUIDE
2003 Microchip Technology Inc. DS21403C-page iii
Table of Contents
Chapter 1. General Information
1.1 Introduction ..................................................................................................... 1
1.2 The TC64X/TC64XB Fan Control Evaluation Board ...................................... 2
1.3 Reference Documents .................................................................................... 4
Chapter 2. Getting Started
2.1 TC64X/TC64XB Fan Control Evaluation Board Functional Description ......... 5
2.2 Implementing The TC64X/TC64XB Fan Control Evaluation Board ................ 7
2.3 Operation In The Adjustable Output Voltage Mode ........................................ 8
Appendix A. Board Layout and Schematic
A.1 Introduction .................................................................................................... 9
A.2 Board Layout and Schematics ....................................................................... 9
Appendix B. Bill-of-Materials (BOM)
B.1 TC64X/TC64XB Fan Control Evaluation Board Components ...................... 11
Worldwide Sales and Service ......................................................................................................12
TC64X/TC64XB Fan Control Evaluation Board User’s Guide
DS21403C-page iv 2003 Microchip Technology Inc.
NOTES:
M
TC64X/TC64XB FAN CONTROL
EVALUATION BOARD USER’S GUIDE
2003 Microchip Technology Inc. DS21403C-page 1
Chapter 1. General Information
1.1 INTRODUCTION
Thank you for purchasing the TC64X/TC64XB Fan Control Evaluation Board from
Microchip Technology Inc. The TC64X/TC64XB Fan Control Evaluation Board allows
the user to evaluate and prototype brushless DC fan control circuits using one of the
following Microchip BDC fan controllers.
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
The fan speed control signal can be provided by an external sensor or voltage signal,
or from the on-board control voltage potentiometer.
Minimum speed setting devices are:
• TC642/2B
• TC647/7B
Auto-shutdown threshold devices are:
• TC646/6B
• TC648/8B
• TC649/9B
The minimum speed setting and auto-shutdown threshold devices are conveniently set
by an on-board potentiometer.
The TC64X/TC64XB Fan Control Evaluation Board has the following features:
1. Capacity for complete evaluation and prototyping for TC64X and TC64XB BDC
fan controllers.
2. Works with any BDC fan.
3. User prototyping area is provided for dedicated circuity and other user-specific
circuits.
4. Jumper blocks allow users to quickly configure output stage and input signal
source.
5. External or internal control voltage.
6. Convenient user test points provide easy access for instrument readings at
critical nodes.
TC64X/TC64XB Fan Control Evaluation Board User’s Guide
DS21403C-page 2 2003 Microchip Technology Inc.
1.2 THE TC64X/TC64XB FAN CONTROL EVALUATION BOARD
The TC64X/TC64XB Fan Control Evaluation Board (Figure 1-1) measures 4” x 6”. The
circuit board is populated with an 8-pin PDIP socket that can accommodate any of the
TC64X and TC64XB devices. While the evaluation kit is pre-configured for a 100 mA,
12V fan, it can be custom-configured for a user-specific combination of control and fan
requirements. A LED status indicator is also provided to give a visual indication of a fan
fault condition.
The TC64X/TC64XB Fan Control Evaluation Board is powered from an external power
supply (5V, 50 mA). The fan speed control signal can be provided by an external sensor,
an external voltage signal or the on-board potentiometer. Minimum speed setting and
auto-shutdown thresholds are conveniently set by a second potentiometer. Also included
are jumper-configurable options for setting the output stage configuration, the modulation
frequency and the input signal source. A SHDN/RESET switch is also available for
manually shutting down the fan or resetting the system.
FIGURE 1-1: TC64X/TC64XB Fan Control Evaluation Board Kit
General Information
2003 Microchip Technology Inc. DS21403C-page 3
The TC64X/TC64XB Evaluation Kit includes the following:
1. 4” x 6” printed circuit board with components installed.
2. TC64X/TC64XB Fan Control Evaluation Board User’s Guide (DS21403).
3. Sample Devices:
If any of these items are damaged or missing, please contact your nearest Microchip
sales office, listed on the back of this publication.
Certain items must be provided by the user to implement the TC64X/TC64XB
Evaluation Kit:
1. A 5.0V, 50 mA regulated power supply
2. A 12.0V regulated power supply capable of supplying the required fan current
3. Small, flat-bladed screwdriver for adjusting the speed control and minimum
speed/auto-shutdown potentiometers
4. Digital volt meter
5. General-purpose oscilloscope
6. Clip leads for power supply and fan connections
7. 12V, 75 mA to 100 mA brushless DC fan
Device
Part Number
PDIP SOIC
TC642B TC642BEPA TC642BEOA
TC646B TC646BEPA TC646BEOA
TC647 TC647VPA TC647VOA
TC647B TC647BEPA EOA TC647B
TC648 TC648VPA TC648VOA
TC648B TC648BEPA TC648BEOA
TC649 TC649VPA TC649VOA
TC649B TC649BEPA TC649BEOA
Note: The TC64X and TC64XB will work with any BDC fan. A 12V, 75 mA to
100 mA fan is recommended for initial start-up since the evaluation board
is preconfigured for this fan rating. If a 12V, 75 mA to 100 mA BDC fan is
not available, the configuration settings of the TC64X/TC64XB Fan
Control Evaluation Board must be modified accordingly.
TC64X/TC64XB Fan Control Evaluation Board User’s Guide
DS21403C-page 4 2003 Microchip Technology Inc.
1.3 REFERENCE DOCUMENTS
Other Reference Documents may be obtained by contacting your nearest Microchip
sales office or by visiting the Microchip web site at www.microchip.com.
•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
•TC642EV, Evaluation Kit for Brushless DC Fan Controllers, DS21403
•TC64X, TC64XB Sell Sheet, DS51252
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.
M
TC64X/TC64XB FAN CONTROL
EVALUATION BOARD USER’S GUIDE
2003 Microchip Technology Inc. DS21403C-page 5
Chapter 2. Getting Started
This Chapter describes how the TC64X/TC64XB Fan Control Evaluation Board
functions and how to use the various features.
The development system demonstrates the ability of the TC64X and TC64XB families
to interface with virtually any brushless DC fan, control the speed of the fan according
to external temperature input, indicate overtemperature conditions, and detect fan
failure. A variety of test points and a user prototyping area are provided for easy and
complete design evaluation. The TC64X/TC64XB Evaluation Kit’s versatility and
ease-of-use helps speed up prototyping and development.
2.1 TC64X/TC64XB FAN CONTROL EVALUATION BOARD FUNCTIONAL
DESCRIPTION
2.1.1 Hardware Description
Various jumper options and sites for user-installed components allow the
TC64X/TC64XB Fan Control Evaluation Board to operate with virtually any BDC fan.
As shown in Figure A-1 of Appendix A. “Board Layout and Schematic”, the
TC64X/TC64XB Fan Control Evaluation Board operates with any of the TC64X and
TC64XB devices installed in the 8-pin DIP socket.
The TC646/646B/648/648B/649/649B devices have an auto-shutdown mode, whereby
the fan is shut off when measured temperature is below a prescribed minimum.
The TC642/2B/647/7B devices operate the fan continuously at a minimum speed when
the measured temperature is low. For details, please refer to the data sheets for these
devices. Shipped from the factory, the TC64X/TC64XB Fan Control Evaluation Board
is configured to operate as a TC642/2B/647/7B that drives a 12V BDC fan having a
100 mA maximum operating current.
The TC64X and TC64XB devices modulate fan speed in direct proportion to the control
signal applied to pin 1 (VIN). This input can be supplied by an off-board sensor, or from
the on-board speed control (Potentiometer 1), depending on the setting of the INT/EXT
switch. The minimum fan operating speed (TC642/2B/647/7B) or auto-shutdown
temperature setting (TC646/6B/648/8B/649/9B) is determined by the setting of
Potentiometer 2. Additionally, the TC64X and TC64XB devices can be manually shut
down (or reset) by pushing the SHDN/RESET switch or by applying a short between
the two terminals of TB4. Be sure JB4 is set to match the TC64X and TC64XB devices
currently in service. The BDC fan modulation frequency should be between 15 Hz to
30 Hz. This frequency is determined either by capacitor C1, or the user-installed
capacitor C2, and the setting of JB1. The default operating frequency is 30 Hz (see the
TC64X and TC64XB data sheets for details).
TC64X/TC64XB Fan Control Evaluation Board User’s Guide
DS21403C-page 6 2003 Microchip Technology Inc.
The output drive device can be either a SOT-23, TO-92 or a TO-220 transistor/
MOSFET, depending on the fan operating current and application. Resistor R2 sets the
base drive current for this transistor. The configuration, as shipped from the factory,
consists of a 2N2222A transistor and a 1.1 kΩ base resistor, which will drive a BDC fan
with an operating current of 100 mA or less. Larger fans can be driven with a different
combination of base resistor and output transistor. Fan commutation pulses are sensed
by pin 5 of the TC64X and TC64XB devices through R3 and C5. Table 2-2 shows
suggested values for R3 for various fan current ratings. The TC64X/TC64XB
Evaluation Kit is shipped from the factory with a 4.7Ω resistor installed for R 3 and a
0.1 µF capacitor installed for C5.
A fault visual indicator is also provided to facilitate experimentation. The FAULT LED is
driven active by Q4 whenever the FAULT output of the TC64X/TC64XB device goes
low. The various jumper blocks and options are summarized in Table 2-1.
TABLE 2-1: TC64X/TC64XB EVALUATION BOARD JUMPER OPTIONS
Jumper
Block
Shorting Block
Installed Function Factory
Setting
JB1 1 to 2 TC64X/TC64XB, 30 Hz timebase enabled. Shorted
3 to 4 TC64X/TC64XB timebase determined by
user-installed capacitor C2.
Open
JB21 to 2 4.7Ω sense resistor selected. Shorted
3 to 4 User-installed sense resistor R4 selected. Open
JB31 to 2 0.1 µF sense capacitor selected
(adequate for nearly all BDC fans).
Shorted
3 to 4 User-installed sense capacitor C4 selected. Open
JB42 to TC642 TC64X/TC64XB Fan Control Evaluation Board
configured for TC642/2B, TC647/7B.
Shorted
2 to TC646 TC64X/TC64XB Fan Control Evaluation Board
configured for TC646/6B, TC648/8B, TC649/9B.
Open
Getting Started
2003 Microchip Technology Inc. DS21403C-page 7
2.2 IMPLEMENTING THE TC64X/TC64XB FAN CONTROL EVALUATION BOARD
Initial start-up of the TC64X/TC64XB Fan Control Evaluation Board is simplified by
using a 12V BDC fan with an operating current between 75 mA to 100 mA. The
TC64X/TC64XB Fan Control Evaluation Board is shipped pre-configured for such a
fan. If such a fan is available, please proceed to Step 1 below.
If such a fan is unavailable, the TC64X/TC64XB Fan Control Evaluation Board will
require modification to certain component values and jumper settings. Proceed to
Section 2.3, “Operation in the Adjustable Output Voltage”.
1. The TC64X/TC64XB Fan Control Evaluation Board is shipped from the factory
configured as outlined in Table 2-1. Inspect the jumper settings on the board to
ensure they match those listed in Table 2-1. Also be sure that a 4.7Ω resistor is
installed for R3, a 1.1 kΩ resistor is installed for R2, a 0.1 µF capacitor is installed
for C5 and a 2N2222A transistor is installed for Q2.
2. Connect the positive side of a 5V DC supply to VDD (BP1) and the negative side
of the supply to GND (BP2).
3. Connect the positive lead of a 12V, 100 mA (max) BDC fan to the FAN + terminal.
Connect the negative lead of the fan to the FAN - terminal.
4. Connect the positive lead of a 12V DC supply to VFAN (BP3). Connect the
negative lead from the 12V DC supply to ground (BP2).
5. Set the INT/EXT switch to INT (Internal Control Voltage). Turn Potentiometer 1
(Speed Control) fully clockwise. Turn Potentiometer 2 (min speed/auto-shutdown
level) fully clockwise.
6. Turn both DC supplies on. The fan should immediately run to full speed and the
FAULT LED should be lit. If this is not the case, check the configuration settings
and repeat steps 1 through 5.
7. Connect the positive lead of a DC voltmeter to test point TP1 and the negative
voltmeter lead to ground. This is the minimum speed setting voltage. Adjust
Potentiometer 2 until a reading of 1.9V is achieved. This voltage corresponds to
a minimum speed setting of approximately 40 percent of full speed.
8. Verify proper operation of the TC642/2B/647/7B by rotating Potentiometer 1
counterclockwise. The fan speed decreases and the FAULT LED goes off. Fan
speed will decrease as Potentiometer 1 is rotated counterclockwise until the
voltage on the wiper of Potentiometer 1 is less than the voltage on the wiper of
Potentiometer 2, at which time the fan will operate continuously at 40 percent of
full speed. Verify the minimum speed circuit is operating by adjusting
Potentiometer 2 clockwise, while Potentiometer 1 is fully counterclockwise.
9. Verify open fan detection by disconnecting one lead of the fan while it is running.
The FAULT LED will light after a disconnect time of about two seconds.
10. Verify locked rotor detection by stopping the fan blades during operation. The
FAULT LED will light approximately two seconds after the fan blades are
stopped.
The TC64X/TC64XB circuit board may now be custom-configured for your particular
combination of control and fan requirements.
TC64X/TC64XB Fan Control Evaluation Board User’s Guide
DS21403C-page 8 2003 Microchip Technology Inc.
2.3 OPERATION IN THE ADJUSTABLE OUTPUT VOLTAGE MODE
2.3.1 Output Driver
Transistors such as 2N2222A are recommended for use as the output driver. These
transistors are low cost, multiple sourced and have a high enough Beta for BDC fan
applications of 200 mA or less operating current. If a single transistor is used, care
must be taken to select a transistor having a minimum hFE of 50 to ensure that the
minimum output current specification (5 mA) of the TC64X and TC64XB devices are
not exceeded. For large BDC fans, a logic level MOSFET is a good choice for the drive
device. All component selections should be made based on information in the
“Applications” section of the TC64X and TC64XB data sheets.
Table 2-2 provides a list of typical fan module operating configurations for 12V fan
applications. The values in Table 2-2 assume the use of low-cost, bipolar transistors
(such as the 2N2222A).
Substituting a logic level MOSFET, such as a BS170, for Q2, results in lower system
voltage losses and significantly reduces output loading on the TC64X and TC64XB
devices. The low RDSON of the MOSFET (1Ω in the case of the BS170) enables it to be
used in place of the Darlington in high current fan applications (See the TC64X and
TC64XB individual data sheets’ “Applications” section for details). The pinout of many
logic level MOSFETs is reversed from that of bipolar junction transistors, so care must
be taken to properly orient the MOSFET.
TABLE 2-2: OUTPUT DRIVE DEVICE CONFIGURATIONS
2.3.2 Sensor Interface Circuit
The TC64X and TC64XB data sheets provide detailed information relating to the
design of a temperature sensor based on a low cost thermistor.
Full Speed Fan
Motor Current
Darlington
Pair/MOSFET*
Single
Transistor
R2
(Ω)
R3
(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
*R2 is not necessary when using a MOSFET as the drive device.
M
TC64X/TC64XB FAN CONTROL
EVALUATION BOARD USER’S GUIDE
2003 Microchip Technology Inc. DS21403C-page 9
Appendix A. Board Layout and Schematic
A.1 INTRODUCTION
This appendix contains general information concerning the layout, schematic and
components associated with the TC64X/TC64XB Fan Control Evaluation Board.
A.2 BOARD LAYOUT AND SCHEMATICS
Figure A-1 depicts the layout for the TC64X/TC64XB Fan Control Evaluation Board.
Figure A-2 shows the schematic for the Fan Control Module.
FIGURE A-1: TC64X/TC64XB Fan Control Evaluation Board Layout
BP1
U1
TC64X
TC642EV
TC642 TC646
VDD
FAN
FAN -
Pot 1
SHDN/RESET
FAULT
JB4
TP7
TB 4
REF1 INT
EXT
TO-220
TO-92
SOT-23
Q3
Q2
Q1
BP2
BP3
JB1Cpwm JB3
JB2
Csense
C3
C8
C2
Q4
R1
R4R3
R5
R
2
C1
C4C5
C7
VIN
VIN
GND
GND
C6
Pot 2
+ +
VMIN /V
AS
V
MIN
GND
TC55
VDD
GND
VDD
VDD
GND
VMIN TP1
VIN TP5
+
+
_
RSENSE
V
OUT
SENSE
RSENSE
TP6
TP4
TP
2
TP3
/FAULT
TC64XB
TC64X/TC64XB Fan Control Evaluation Board User’s Guide
DS21403C-page 10 2003 Microchip Technology Inc.
FIGURE A-2: Fan Control Module Schematic
FAULT
SENSE
Ext
SHDN/
RESET
TB4
SHDN/
RESET
GND
VDD
VDD
VDD
VDD
8
1
3
4
2
5
7
6
VIN
VMIN
(VAS)
VOUT
C1*
1 µF
C3
1 µF
C6
0.01 µF
C7
0.01 µF
TP5
TP7
Int
Pot 1
(Speed Control)
Potentiometer 2
(Min Speed/
Shutdown Level)
Ext
External
Sensor
Input
Ref1
Reg1
CF
TC64X/TC64XB
TO-220
FAN
BP3
VFan
BP2
GND
BP1
VDD
TO-92
2N2222A*
C8
4.7 µF
+
R2*
1.1 kΩ
SOT-23
1
1
2
2
2
TC642 TC646
3
3
4
JB 1
JB 4
TP13 4
1 2
JB3
TP4
TP6C4
C5*,0.1 µF
TP3
TP2
CC
EE
BB
VDD VDD
IN
GND
OUT
TC55
3 4
1 2
JB2
R4
R3*
4.7Ω
R5
30 kΩ
R1
620Ω
FAULT
Q4
2N3906
* Indicates normal value.
Dashed line = factory setting.
M
TC64X/TC64XB FAN CONTROL
EVALUATION BOARD USER’S GUIDE
2003 Microchip Technology Inc. DS21403C-page 11
Appendix B. Bill-of-Materials (BOM)
B.1 TC64X/TC64XB FAN CONTROL EVALUATION BOARD COMPONENTS
Table B-1 lists typical components and associated values that comprise the
TC64X/TC64XB Fan Control Evaluation Board.
TABLE B-1: FAN CONTROL MODULE COMPONENTS
Component Typical Value
BP1 – BP3 Banana receptacle
C11 µF tantalum capacitor.
C2Not installed
C31 µF tantalum capacitor
C4Not installed
C50.1 µF ceramic capacitor
C6
, C70.01 µF ceramic capacitor
C84.7 µF tantalum capacitor
JB1 – JB4SIP header terminal strips
LED -1 Miniature LED
Pot 1, Pot 2 1 kΩ, on-board potentiometer
Q1Not installed (SOT-23 site)
Q22N2222A NPN bipolar transistor
Q3Not installed (TO-220 site)
Q42N3906 PNP bipolar transistor
R1620Ω, 1/4 watt, 5% carbon resistor
R21.1 kΩ, 1/4 watt, 5% carbon resistor
R34.7Ω, 1/4 watt, 5% carbon resistor
R4Not installed
R530 kΩ, 1/4 watt, 5% carbon resistor
REF-1 LM385, 1.2V reference
REG-1 TC55RP3002EZB 3.0V, 2% regulator
SW-1 Miniature SPDT toggle switch (INT/EXT Switch)
SW-2 Miniature SPDT push button switch (SHDN/RESET switch)
U1 TC642B, TC646B, TC647/7B, TC648/8B, TC649/9B (Two, each provided as
samples)

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: TC649

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