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TC642DEMO

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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:
M
TC64X/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., Q
3
installed; Q
1
and Q
2
not 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
h
FE
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
(Q
1
, Q
2
)
Single Transistor
(Q
3
)
R
5
(Ω)
R
6
(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
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