TC642DEMO Microchip Technology, TC642DEMO Datasheet - Page 9

• Manufacturer Part Number: TC642DEMO
• Description: DEMO BOARD FOR TC642/46/47/48/49
• Manufacturer: Microchip Technology

Specifications of TC642DEMO

• Processor To Be Evaluated: TC642 and TC646
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

M
2.1
2003 Microchip Technology Inc.
TC64X/TC64XB FAN CONTROL DEMO BOARD TYPICAL MODULE
CONFIGURATIONS
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.
2.1.1
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:
Fan motors of 50 mA to 150 mA can be driven using the single transistor driver
configuration (i.e., Q
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
TC64X and TC64XB devices is sufficient to saturate the transistor when it is conducting
the full fan current.
FE
Fan Current
Full Speed
100 mA
150 mA
200 mA
200 mA
250 mA
300 mA
350 mA
400 mA
450 mA
of at least 50 to ensure the minimum output current specification (5 mA) of the
50 mA
Chapter 2. Getting Started
Using Bipolar Driver Transistors
SUGGESTED OUTPUT DRIVER/CURRENT SENSE VALUES
VS. FAN CURRENT
Darlington Pair
3
installed; Q
(Q
1
—
—
—
—
TC64X/TC64XB FAN CONTROL
X
X
X
X
X
X
, Q
DEMO BOARD USER’S GUIDE
2
)
1
and Q
Single Transistor
2
not installed). Fans having a motor current
(Q
—
—
—
—
—
—
X
X
X
X
3
)
2.4 k
1.1 k
5.6 k
4.7 k
3.9 k
3.3 k
3.0 k
2.4 k
750
620
R
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4.7
3.0
2.4
2.4
2.0
1.8
1.5
1.3
1.2
R
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