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TC642

Status: In Production

Features:

  • Temperature Proportional
  • Fan Speed for Acoustic Control and Longer Fan Life
  • Efficient PWM Fan Drive
  • 3.0V 5.5V Supply Range
  • Supports Any Fan Voltage!
  • FanSense™ Fault Detection Circuits Protect Against Fan Failure and Aid
  • System Testing
  • 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 TC642 is a switch mode fan speed controller for use with brushless DC motors. Temperature proportional speed control is accomplished using pulse width modulation. A thermistor (or other voltage output temperature sensor) connected to the VIN input furnishes the required control voltage of 1.25Vto 2.65V (typical) for 0% to 100% PWM duty cycle. Minimum fan speed is set by a simple resistor divider on the VMIN input. An integrated Start-Up Timer ensures reliable motor start-up at turn-on, coming out of Shutdown Mode, or following a transient fault. A logic low applied to VMIN, pin 3, causes fan shutdown. The TC642 also features Microchip Technology's proprietary FanSense™ technology for increasing system reliability. In normal fan operation, a pulse train is present at SENSE, pin 5, indicating normal operation. A missing-pulse detector monitors this pin during normal fan operation. A stalled, open, or unconnected fan causes the TC642 to trigger its start-up 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%

Additional Features
    • Temperature Proportional
    • Fan Speed for Acoustic Control and Longer Fan Life
    • Efficient PWM Fan Drive
    • 3.0V 5.5V Supply Range
    • Fan Voltage Independent of TC642 Supply Voltage
      • Supports Any Fan Voltage!
    • FanSense™ Fault Detection Circuits Protect Against Fan Failure and Aid
    • System Testing
    • 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
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 Sheets


Development tools data is currently unavailable.

Similar Devices

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Typical Accuracy (º)
Temp Range
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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
TC642BEUA
0.025600
0.070000
8
MSOP
3x3mm
Matte Tin
e3
TC642BEUA713
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
TC642EUA
0.025600
0.070000
8
MSOP
3x3mm
Matte Tin
e3
TC642EUA713
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
TC642VUA
0.025600
0.070000
8
MSOP
3x3mm
Matte Tin
e3
TC642VUA713
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
TC642BEOA
0.078000
0.250000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC642BEOA713
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC642COA
0.078000
0.250000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC642COA713
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC642EOA
0.078000
0.250000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC642EOA713
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC642VOA
0.078000
0.250000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC642VOA713
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC642BEPA
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
TC642CPA
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
TC642VPA
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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