TC649EPATR View Datasheet(PDF) - Microchip Technology

Part Name

Description

MFG CO.

TC649EPATR

PWM Fan Speed Controller with Auto-Shutdown and FanSense™ Technology

Microchip Technology

'TC649EPATR' PDF : 28 Pages View PDF

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TC649
Power-Up
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)
Fan Pulse
Detected?
Yes
Normal
Operation
Fire Start-up
No
(1TiSmYEeECrS)
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
Normal
Operation
Clear Missing
Pulse Detector
VIN < VSHDN?
No
VIN < VAS?
No
VOUT
Proportional
to VIN
Yes Shutdown
VOUT = 0
Yes
Auto
Shutdown
VOUT = 0
VIN > No
(VAS + VHAS)
No
VIN > VREL
Yes
Power-Up
Yes
Hot Start
Yes
Fan Pulse
No
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:
TC649 Behavioral Algorithm Flowchart.
DS21449C-page 8
 2002 Microchip Technology Inc.

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