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TC651EAVUA Scheda tecnica(PDF) 6 Page - Microchip Technology

Il numero della parte TC651EAVUA
Spiegazioni elettronici  Tiny Integrated Temperature Sensor & Brushless DC Fan Controller with Over-Temperature Alert
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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TC650/TC651
DS21450B-page 6
© 2002 Microchip Technology Inc.
3.4
Shutdown (SHDN)
The fan can be unconditionally shutdown by pulling low
the SHDN pin. During shutdown, the PWM output is
low. This is ideal for notebook computers and other
portable applications when you need to change
batteries and must not have the fan running at that
time. Thermal monitoring and TOVER are still in
operation during shutdown. IDD shutdown current is
around 50
µA.
3.5
Auto-Shutdown Mode
The
TC651
features
auto-shutdown;
when
the
temperature is below the factory set point at minimum
speed (TL), PWM is low and the fan is automatically
shut off (Auto-shutdown mode). This feature is ideal for
notebook computers and other portable equipment that
need to conserve as much battery power as possible
and thus run a fan when it is only absolutely needed.
The TC651 will continue to be active so as to monitor
temperature for Tover. The TC651 exits Auto-shutdown
mode when the temperature rises above the factory set
point (T1).
3.6
Temperature Selection Guide
(Minimum Fan Speed/Full Speed)
The five temperature regions defined by the six
thresholds are defined in the TC650/TC651 by means
of factory trimming. Once a TL and TH are set, the T1
T4 thresholds are automatically equally spaced
between TL and TH.
Note: The Bold Type temperature settings are available for
ordering. Contact factory for other temperature selec-
tions.
TL and TH canbeselectedin5°C increments. TH must
be chosen at least 10oC higher than TL.TL can range
anywhere from 25°C to 35°C.
As an example, suppose you wanted the fan to run at
40% speed at 25°C or less and go to full speed at
45°C. You would order the part number TC650AEVUA.
As another example, suppose you wanted the fan to
turn on at 30°C and go to full speed at 45°C. You
would order the part number TC651BEVUA.
Temp.
Range
TL
TH
Part #
10°C
25
35
AC
30
40
BD
35
45
CE
15°C
25
40
AD
30
45
BE
35
50
CF
20°C
25
45
AE
30
50
BF
35
55
CG
30°C
25
55
AG


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