TC649B View Datasheet(PDF) - Microchip Technology

Part Name

Description

MFG CO.

TC649B

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

Microchip Technology 

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TC646B/TC648B/TC649B

Functional Block Diagram

TC646B/TC649B

VOTF

VIN

Note

VDD

CF

Clock

Generator

VAS

VSHDN

GND

Control

Logic

Note: The VOTF comparator

is for the TC646B device only.

3xTPWM

Timer

VOUT

Start-up

Timer

Missing

Pulse

Detect

FAULT

10 kΩ

70 mV

(typ)

SENSE

TC648B

VIN

VOTF

VDD

CF

Clock

Generator

VAS

VSHDN

GND

Control

Logic

Start-up

Timer

VOUT

OTF

NC

DS21755B-page 2

 2003 Microchip Technology Inc.

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