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TC648B

Status: In Production

Features:

  • Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life
  • Over-Temperature Indication
  • Efficient PWM Drive
  • Automatic Shutdown Mode for "Green" Systems
  • 3.0V to 5.5V Supply Range
  • Fan Voltage Independent of Supply Voltage – Supports Any Fan Voltage
  • 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 TC648B is a new version of the existing TC648 fan speed controller. This device is a switch mode fan speed controller, which incorporates a new fan auto restart function. Temperature proportional speed control is accomplished using pulse width modulation. A thermistor (or other voltage output temperature sensor) connected to the VIN input supplies the required control voltage of 1.20V to 2.60V (typical) for 0% to 100% PWM duty cycle. The auto-shutdown speed is set by a simple resistor divider on the VAS input. An integrated Start-Up Timer ensures reliable fan motor start-up at turn-on, coming out of shutdown mode, auto-shutdown mode, or following a transient fault. A logic low applied to VIN, pin 1, causes fan shutdown. The OTF signal is asserted if the PWM reaches 100% duty cycle, indicating that maximum cooling capability has been reached and a possible thermal runaway condition exists.

Additional Features
    • Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life
    • Over-Temperature Indication
    • Efficient PWM Drive
    • Automatic Shutdown Mode for "Green" Systems
    • 3.0V to 5.5V Supply Range
    • Fan Voltage Independent of Supply Voltage – Supports Any Fan Voltage
    • 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)
400
Max. Accuracy @ 25°C (°C)
Depends on External Thermistor
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

Product Line Card


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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (Kg)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
TC648BEUA
0.025600
0.070000
8
MSOP
3x3mm
Matte Tin
e3
TC648BEUA713
0.025600
0.215600
8
MSOP
3x3mm
Matte Tin
e3
TC648BEOA
0.078000
0.250000
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC648BEOA713
0.078000
0.230303
8
SOIC
.150In(3.90mm)
Matte Tin
e3
TC648BEPA
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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