TC646B View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

TC646B

PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense™ Technology for Fault Detection

Microchip Technology 

TC646B/TC648B/TC649B

Power-Up

Power-on

Reset

OTF = 1

VAS = 0V

Yes

Minimum

Speed Mode

No

VIN < VAS?

No

Yes Auto-

Shutdown

VOUT = 0

VIN >

No

(VAS+ VHAS)

Yes

Fire Start-up

Timer

(1 sec)

Normal

Operation

Minimum

Speed Mode

Yes

VOUT = 0

No

VIN > 1.20V

Power-Up

Yes

VIN = 0V

No

No

VIN > 1.20V

VOUT = 0

Yes

VOUT

Proportional

to VIN

Yes

VIN > VOTF?

No

OTF = 0

OTF = 1

Normal

Operation

VOUT

Proportional

to VIN

Yes

VIN > VOTF?

No

OTF = 0

OTF = 1

Auto

Yes

Shutdown

VIN < VAS?

VOUT = 0

No

FIGURE 4-10:

TC648B Behavioral Algorithm.

 2003 Microchip Technology Inc.

DS21755B-page 17

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