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Part Name
Description
TC642BEUA(2003) View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
TC642BEUA
(Rev.:2003)
PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense™ Technology for Fault Detection
Microchip Technology
TC642BEUA Datasheet PDF : 34 Pages
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TC642B/TC647B
Power-Up
Normal
Operation
Power-on
Reset
FAULT = 1
Yes
V
MIN
< V
SHDN
?
No
Fire Start-up
Timer
(1 sec)
Shutdown
V
OUT
= 0
No
V
MIN
> V
REL
?
Yes
Fan Pulse
Detected?
Yes
Normal
Operation
Fire Start-up
No
Timer
(1 sec)
Yes Fan Pulse
Detected?
No
Fan Fault
Clear Missing
Pulse Detector
Yes
V
MIN
< V
SHDN
?
No
V
IN
> V
OTF
?
Yes
FAULT = 0
Shutdown
V
OUT
= 0
No
V
MIN
> V
REL
?
Yes
Power-Up
No
V
OUT
Proportional to Greater
of V
IN
or V
MIN
TC642B Only
Yes
Fan Pulse No
Detected?
M.P.D.
No Expired?
Yes
Fire
Diagnostic
Timer
(100 msec)
Fan Fault
FAULT = Low,
V
OUT
= High
Yes
V
MIN
<V
SHDN
?
Shutdown
V
OUT
= 0
No
No
16 Pulses
Detected?
No
Yes
V
MIN
> V
REL
?
Power-Up
Yes
Normal
Operation
FIGURE 4-9:
TC642B/TC647B Behavioral Algorithm.
Yes
Fan Pulse
Detected?
No
Fire Start-up
Timer
(1 sec)
Yes
Fan Pulse
Detected?
No
Fan Fault
DS21756B-page 16
2003 Microchip Technology Inc.
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