TC646 View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
TC646 Datasheet PDF : 28 Pages
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TC646
Power-Up
Normal
Operation
Power-on
Reset
FAULT = 1
Yes
VIN < VSHDN?
No
Shutdown
VOUT = 0
No
VIN > VREL?
Yes
VIN < VAS?
No
Hot Start
Yes Auto-
Shutdown
VOUT = 0
VIN >
No
(VAS + VHAS)
Yes
Fire Start-up
Timer
(1 SEC)
Clear Missing
Pulse Detector
VIN < VSHDN?
No
Yes
Shutdown
VOUT = 0
No
VIN > VREL
VIN < VAS?
Yes
Auto
Shutdown
VOUT = 0
No
Yes
VIN > VOTF?
VIN >
No
(VAS + VHAS)
Yes
Power-Up
Yes
No
FAULT = 0
Hot Start
VOUT
Proportional
to VIN
Fan Pulse
Detected?
Yes
Normal
Operation
No Fire Start-up
TimYeErS
(1 SEC)
Yes Fan Pulse
Detected?
No
Fan Fault
Fan Fault
FAULT = 0,
VOUT = 0
Auto-Shutdown
FAULT = 1
VOUT = 0
Yes
No
VIN < VSHDN ?
Yes
VIN > VREL ?
No
No
VIN > (VAS + VHAS)?
Yes
Power-Up
No
Cycling
Power
Yes
Yes
No
Fan Pulse
Detected?
M.P.D.
Expired?
No
Yes
Fire
Diagnostic
Timer
(100msec)
Yes
No
Fan Pulse
Detected?
Fire Start-up
Timer
(1 sec)
Yes Fan Pulse
Detected?
No
Fan Fault
FIGURE 4-1:
TC646 Behavioral Algorithm Flowchart.
2002 Microchip Technology Inc.
DS21446C-page 9
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