TC647(2002) View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

TC647
(Rev.:2002)

PWM Fan Speed Controller with FanSense™ Technology

Microchip Technology 

TC647

Power-Up

Normal

Operaton

Power-on

Reset

FAULT = 1

Yes

VMIN < VSHDN

No

Fire Start-up

Timer

(1 SEC)

Shutdown

VOUT = 0

No

VMIN > VREL?

Yes

Fan Fault

Detected?

Yes

Fire Start-up

TimYeErS

(1 SEC)

Clear

Missing Pulse

Detector

VMIN < VSHDN?

No

Yes

Shutdown

VOUT = 0

No

VMIN > VREL

Yes

Power-up

No

Normal

Operation

Yes Fan Pulse

Detected?

No

Fan Fault

Fan Fault

FAULT = 0,

VOUT = 0

VMIN < VSHDN?

No

Yes

VMIN > VREL? No

Yes

Power-up

No

Cycling

Power?

Yes

VOUT

Proportional to Greater

of VIN or VMIN

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:

TC647 Behavioral Algorithm Flowchart.

DS21447C-page 8

 2002 Microchip Technology Inc.

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