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

R1

+

-

VIN

1 VIN

C3

0.1 µF

R2

+

-

VAS

3

VAS

C4

0.1 µF

2

CF

C7

.01 µF

K1

K2

C6

C5

1 µF 0.1 µF

C2

C1

1 µF 0.1 µF

+

-

VDD

8

VDD

7

VOUT

TC646B

TC648B

TC649B

6

FAULT / OTF

GND

4

5

SENSE

K3

R6

+

-

Current

limited

voltage

source

C8

0.1 µF

VDD

R5

K4

+ Current

- limited

voltage

source

R4

R3

VSENSE

(pulse voltage source)

TC646B and TC649B

FIGURE 1-4:

Note: C5 and C7 are adjusted to get the necessary 1 µF value.

TC646B/TC648B/TC649B Electrical Characteristics Test Circuit.

DS21755B-page 6

 2003 Microchip Technology Inc.

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