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TC647 Datasheet(PDF) 8 Page - Microchip Technology

Part # TC647
Description  PWM Fan Speed Controller with FanSense Technology
PDF  28 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC647 Datasheet(HTML) 8 Page - Microchip Technology

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TC647
DS21447C-page 8
 2002 Microchip Technology Inc.
FIGURE 4-1:
TC647 Behavioral Algorithm Flowchart.
FAULT = 0,
VOUT = 0
Cycling
Power?
VMIN < VSHDN?
Yes
Yes
Yes
No
No
Fan Fault
Power-up
VMIN > VREL?
Fan Fault
Detected?
Fan Pulse
Detected?
VMIN < VSHDN
Shutdown
VOUT = 0
Yes
No
No
Yes
Yes
Power-Up
Normal
Operation
Fan Fault
YES
Power-on
Reset
FAULT = 1
VMIN > VREL?
No
Fire Start-up
Timer
(1 SEC)
Fire Start-up
Timer
(1 SEC)
VMIN > VREL
Yes
Fan Fault
Clear
Missing Pulse
Detector
VOUT
Proportional to Greater
of VIN or VMIN
VMIN < VSHDN?
M.P.D.
Expired?
Fan Pulse
Detected?
No
No
No
No
No
Yes
Yes
Yes
Normal
Operaton
Power-up
Yes
Fire Diagnostic
Timer
(100msec)
Fan Pulse
Detected?
Fan Pulse
Detected?
Fire Start-up
Timer
(1 SEC)
Yes
No
Shutdown
VOUT = 0
No
Yes
No



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