TC649VUATR Ver la hoja de datos (PDF) - Microchip Technology

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TC649VUATR

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

Microchip Technology 

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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