TC648 View Datasheet(PDF) - Microchip Technology

Part Name

Description

MFG CO.

TC648

Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert

Microchip Technology 

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TC648

Power-Up

Power-on

Reset

OTF = 1

Yes

VAS ≈ 0V

No

Minimum

Speed Mode

VIN < VAS?

No

Yes

Auto-

Shutdown

VOUT = 0

VIN >

No

(VAS + VHAS)

YES

Fire Start-up

Timer

Normal

Operation

Minimum

Speed Mode

VOUT = 0

Yes

VIN ≈ 0V ?

No

No

VIN > 1.25V

Yes

Power-Up

No

VIN > 1.25V ?

VOUT = 0

Yes

VOUT Duty Cycle Proportional to VIN

Yes

VIN > VOTF?

No

OTF = 0

OTF = 1

FIGURE 4-1:

TC648 Behavioral Algorithm Flowcharts.

DS21448C-page 8

Normal

Operation

VOUT Duty

Cycle Prop.

to VIN

Yes

VIN > VOTF?

No

OTF = 0

OTF = 1

Yes

VIN < VAS ?

No

Auto-

Shutdown

VOUT = 0

 2002 Microchip Technology Inc.

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