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TC649VUA Datasheet(PDF) 8 Page - Microchip Technology

Part # TC649VUA
Description  PWM Fan Speed Controller with Auto-Shutdown and FanSense??Technology
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC649VUA Datasheet(HTML) 8 Page - Microchip Technology

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TC649
DS21449C-page 8
 2002 Microchip Technology Inc.
FIGURE 4-1:
TC649 Behavioral Algorithm Flowchart.
FAULT = 0,
VOUT = 0
Auto-Shutdown
FAULT = 1,
VOUT = 0
Cycling
Power
VIN < VSHDN?
Yes
Yes
Yes
No
No
No
No
Yes
Power-Up
VIN > (VAS + VHAS)?
VIN > VREL?
Fan Pulse
Detected?
Fan Pulse
Detected?
VIN < VSHDN
VIN < VAS?
Shutdown
VOUT = 0
Auto-
Shutdown
VOUT = 0
Yes
No
No
No
No
Yes
Yes
Yes
Power-Up
Normal
Operation
Fan Fault
YES
Power-on
Reset
FAULT = 1
VIN > VREL?
No
VIN >
(VAS + VHAS)
Yes
Yes
No
Hot Start
Fire Start-up
Timer
(1 SEC)
Fire Start-up
Timer
(1 SEC)
VIN > VREL
Yes
Fan Fault
Fan Fault
Clear Missing
Pulse Detector
VOUT
Proportional
to VIN
VIN < VSHDN?
VIN < VAS?
M.P.D.
Expired?
Fan Pulse
Detected?
Shutdown
VOUT = 0
Auto
Shutdown
VOUT = 0
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Normal
Operation
Power-Up
VIN >
(VAS + VHAS)
No
Yes
Hot Start
Yes
Fire
Diagnostic
Timer
(100msec)
Fan Pulse
Detected?
Fan Pulse
Detected?
Fire Start-up
Timer
(1 Sec)
Yes
No


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