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TC64X/TC64XB Fan Control Evaluation Board User’s Guide
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 h FE 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 Q 2 , results in lower system
voltage losses and significantly reduces output loading on the TC64X and TC64XB
devices. The low R DSON of the MOSFET (1 ? 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
Full Speed Fan
Motor Current
50 mA
100 mA
150 mA
200 mA
200 mA
250 mA
300 mA
350 mA
400 mA
450 mA
Darlington
Pair/MOSFET*
—
—
—
—
X
X
X
X
X
X
Single
Transistor
X
X
X
X
—
—
—
—
—
—
R 2
( ? )
2.4 k
1.1 k
750
620
5.6 k
4.7 k
3.9 k
3.3 k
3.0 k
2.4 k
R 3
( ? )
9.1
4.7
3.0
2.4
2.4
2.0
1.8
1.5
1.3
1.2
* R 2 is not necessary when using a MOSFET as the drive device.
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.
DS21403C-page 8
? 2003 Microchip Technology Inc.
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