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

ELECTRICAL CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise specified, all limits are specified for -40°C < TA < +85°C, VDD = 3.0V to 5.5V.

Parameters

Sym

Min

Typ

Max

Units

Conditions

Pulse-Width Modulator

PWM Frequency

fPWM

26

30

SENSE Input (TC646B & TC649B)

SENSE Input Threshold Voltage

VTH(SENSE)

50

70

with Respect to GND

Blanking time to ignore pulse due

tBLANK

—

3.0

to VOUT turn-on

FAULT / OTF Output

Output Low Voltage

VOL

—

—

Missing Pulse Detector Timer

tMP

—

32/f

Start-up Timer

tSTARTUP

—

32/f

Diagnostic Timer

tDIAG

—

3/f

Note 1: Ensured by design, tested during characterization.

2: For VDD < 3.7V, tSTARTUP and tMP timers are typically 13/f.

34

Hz CF = 1.0 µF

90

mV

—

µsec

0.3

V IOL = 2.5 mA

—

sec TC646B and TC649B, Note 2

—

sec Note 2

—

sec TC646B and TC649B

TEMPERATURE SPECIFICATIONS

Electrical Characteristics: Unless otherwise noted, all parameters apply at VDD = 3.0V to 5.5V

Parameters

Sym

Min

Typ

Max

Units

Temperature Ranges

Specified Temperature Range

Operating Temperature Range

Storage Temperature Range

Thermal Package Resistances

TA

-40

—

+85

°C

TA

-40

—

+125

°C

TA

-65

—

+150

°C

Thermal Package Resistance, 8-Pin MSOP

θJA

—

200

—

°C/W

Thermal Package Resistance, 8-Pin SOIC

θJA

—

155

—

°C/W

Thermal Package Resistance, 8-Pin PDIP

θJA

—

125

—

°C/W

Conditions

DS21755B-page 4

 2003 Microchip Technology Inc.

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