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TC646

Status: In Production

Features:

  • Temperature Proportional
  • Fan Speed for Acoustic Control and Longer Fan Life
  • Efficient PWM Fan Drive
  • 3.0V to 5.5V Supply Range
  • Supports Any Fan Voltage!
  • FanSense™ TM Fault Detection Circuits Protect Against Fan Failure and Aid
  • System Testing
  • Automatic Shutdown Mode for "Green" Systems
  • Supports Low Cost NTC/PTC Thermistors
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

The TC646 is a switch mode fan speed controller for use with brushless DC motors. Temperature proportional speed control is accomplished using pulse width modulation(PWM). A thermistor (or other voltage output temperature sensor)connected to the VIN input furnishes the required control voltage of 1.25V to 2.65V(typical) for 0% to 100% PWM duty cycle. The TC646 automatically suspends fan operation when measured temperature (VIN) is below a user-programmed minimum setting (VAS). An integrated Start-Up Timer ensures reliable motor start-up at turn-on, coming out of Shutdown mode, or following a transient fault. In normal fan operation, a pulse train is present at SENSE, pin 5. The TC646 also features Microchip Technology's proprietary FanSense™ TM technology for increasing system reliability. A missing-pulse detector monitors this pin during fan operation. A stalled, open, or unconnected fan causes the TC646 to trigger its startup timer once. If the fault persists, the FAULT output goes low, and the device is latched in its Shutdown Mode. FAULT is also asserted if the PWM reaches 100% duty cycle, indicating a possible thermal runaway situation, although the fan continues to run. See the Applications section for more information and system design guidelines. The TC646 is packaged in a space-saving 8-pin plastic DIP, MSOP or SOIC package and is available in the industrial temperature range.

Additional Features
    • Temperature Proportional
    • Fan Speed for Acoustic Control and Longer Fan Life
    • Efficient PWM Fan Drive
    • 3.0V to 5.5V Supply Range
    • Fan Voltage Independent of TC646 Supply Voltage
      • Supports Any Fan Voltage!
    • FanSense™ TM Fault Detection Circuits Protect Against Fan Failure and Aid
    • System Testing
    • Automatic Shutdown Mode for "Green" Systems
    • Supports Low Cost NTC/PTC Thermistors
Parametrics
Name
Value
Device Description
Fan Manager
Typical Accuracy (°C)
Depends on external thermistor
Over Temp Alert
yes
Max. Supply Current (µA)
1000
Max. Accuracy @ 25°C (°C)
Depends on external thermistor
Fan Sense
Yes
External Temp Input
Yes
Auto Shutdown
Yes
High/Low PWM Freq
Low
Temp Range (°C)
-40 to +85
Vcc Range (V)
+3.0 to +5.5

Documents

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Data Sheet

02/05/2013
368KB

Product Line Card


Development tools data is currently unavailable.

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
TC646BEUA
0.025600
0.070000
8
MSOP
3x3mm
Matte Tin
e3
TC646BEUA713
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
TC646EUA
0.025600
0.070000
8
MSOP
3x3mm
Matte Tin
e3
TC646EUA713
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
TC646VUA
0.025600
0.070000
8
MSOP
3x3mm
Matte Tin
e3
TC646VUA713
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
TC646BEOA
0.078000
0.250000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC646BEOA713
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC646EOA
0.078000
0.250000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC646EOA713
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC646VOA
0.078000
0.250000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC646VOA713
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC646BEPA
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
TC646VPA
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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