TC648

The TC648 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 TC648 can be configured to operate in either Auto-Shutdown or Minimum Speed mode. In Auto-Shutdown mode,fan operation is automatically suspended when measured temperature (VIN) is lower than a user-programmed minimum setting (VAS). The fan is automatically restarted and proportional speed control restored when VIN exceeds VAS (plus hysteresis). Operation in Minimum Speed mode is similar to Auto-Shutdown mode, except the fan is operated at a user-programmed minimum setting when measured temperature is low. An integrated Start-Up Timer ensures reliable motor start-up at turn-on, or when coming out of Shutdown mode. The over-temperature fault (OTF) is asserted when the PWM reaches 100% duty cycle, indicating a possible thermal runaway situation. The TC648 is packaged in a space-saving 8-pin plastic DIP, MSOP or SOIC package and is available in the industrial temperature range.

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 TC648 Supply Voltage - Supports Any Fan Voltage!
  • Over-Temperature Fault Detection
  • Automatic Shutdown Mode for "Green" Systems
  • Supports Low Cost NTC/PTC Thermistors
Parameter
Parameter Name Value Value
Device Description Fan Manager Fan Manager
Typical Accuracy (°C) Depends on external thermistor Depends on external thermistor
Over Temp Alert yes yes
Max. Supply Current (µA) 1000 1000
Max. Accuracy @ 25°C (°C) Depends on external thermistor Depends on external thermistor
External Temp Input Yes Yes
Auto Shutdown Yes Yes
High/Low PWM Freq Low Low
Temp Range (°C) -40 to +85 -40 to +85
Vcc Range (V) +3.0 to +5.5 +3.0 to +5.5
Documents
TC648 DatasheetData Sheets02/05/2013348KB
AN770 - Linear Voltage Fan Speed Control Using Microchip?s TC64x Family (TC642, TC646, TC648)AppNote07/27/2004203KB
AN771 - Suppressing Acoustic Noise in PWM Fan Speed Control SystemsAppNote07/27/2004276KB
TB063 - An Integrated Fan Speed Control Solution Can Lower System Costs, Reduce Acoustic Noise, Power Consumption and Enhance System ReliabilityAppNote02/24/2003204KB
Analog & Interface Guide (Volume 2)Brochures10/11/20051067KB
Quick Guide to Microchip Development ToolsBrochures10/15/201411223KB
Fan Control Function Pack Design GuideProduct Line Documents08/23/2006162KB
Fan Management Solutions Product OverviewProduct Line Documents08/23/200687KB
Fan Speed Controller and Fan Fault Detector FamilyProduct Line Documents05/13/2003245KB
Analog & Interface Product Selector GuideProduct Line Card03/21/20164116KB
8-Pin SOIC/MSOP/TSSOP/DIP Evaluation Board User's GuideUser Guides01/24/20061367KB
TC64X/TC64XB Fan Control Evaluation Board User's GuideUser Guides11/24/2003360KB
Thermistor Value Calculator with Solver for the TC64x FamilyUser Guides11/24/2003130KB
Thermistor Value Calculator without Solver for the TC64x FamilyUser Guides11/24/2003107KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
TC648EOA8SOIC-40C to +85CTUBE1.271.060.960.930.92
TC648EOA7138SOIC-40C to +85CT/R1.271.060.960.930.92
TC648EUA8MSOP-40C to +85CTUBE1.261.050.950.920.91
TC648EUA7138MSOP-40C to +85CT/R1.261.050.950.920.91
TC648VOA8SOIC0C to +85CTUBE1.231.020.930.900.89
TC648VOA7138SOIC0C to +85CT/R1.231.020.930.900.89
TC648VPA8PDIP0C to +85CTUBE1.301.090.990.950.94
TC648VUA8MSOP0C to +85CTUBE1.180.980.890.860.85
TC648VUA7138MSOP0C to +85CT/R1.180.980.890.860.85
Similar Devices
ProductDescriptionTypical Accuracy (º)Temp RangePrice5K
EMC2101±0.5-40 - +125$0.79
EMC2300±0.250 - 70$1.24
EMC6D102±0.250 - 70$1.63
EMC6D103±0.250 - 70$1.80
EMC6D103S±0.250 - 70$1.80
EMC6W201±0.250 - 70$2.19
TC642Fan ManagerDepends on external thermistor-40 - +85$1.02
TC642BFan ManagerDepends on external thermistor-40 - +85$0.84
TC646Fan ManagerDepends on external thermistor-40 - +85$1.02
TC646BFan ManagerDepends on external thermistor-40 - +85$0.84
TC647Fan ManagerDepends on external thermistor-40 - +85$0.94
TC647BFan ManagerDepends on external thermistor-40 - +85$0.84
TC648Fan ManagerDepends on external thermistor-40 - +85$0.85
TC648BFan ManagerDepends on External Thermistor-40 - +85$0.79
TC649Fan ManagerDepends on external thermistor-40 - +85$0.94
TC649BFan ManagerDepends on external thermistor-40 - +85$0.84
TC650Fan Manager1-40 - +125$1.26
TC651Fan Manager1-40 - +125$1.08
TC652Fan Manager1-40 - +125$1.36
TC653Fan Manager1-40 - 125$1.36
TC654Dual SMBus Fan ManagerDepends on external thermistor-40 - +85$1.43
TC655Dual SMBus Fan ManagerDepends on external thermistor-40 - +85$1.53
TC664Single SMBus Fan ManagerDepends on external thermistor-40 - +85$1.27
TC665Single SMBus Fan ManagerDepends on external thermistor-40 - +85$1.31
TC670Predictive Fan Fault DetectorN/A-40 - +85$0.94
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
TC648BEPA0.4867000.9000008PDIP.300inMatte Tine3
TC648VPA0.4867000.9000008PDIP.300inMatte Tine3
TC648VOA0.0780000.1600008SOIC.150In(3.90mm)Matte Tine3
TC648VOA7130.0780000.2303038SOIC.150In(3.90mm)Matte Tine3
TC648EOA0.0780000.1600008SOIC.150In(3.90mm)Matte Tine3
TC648EOA7130.0780000.2303038SOIC.150In(3.90mm)Matte Tine3
TC648BEOA0.0780000.1600008SOIC.150In(3.90mm)Matte Tine3
TC648BEOA7130.0780000.2303038SOIC.150In(3.90mm)Matte Tine3
TC648BEUA0.0256000.0700008MSOP3x3mmMatte Tine3
TC648BEUA7130.0256000.2156008MSOP3x3mmMatte Tine3
TC648EUA0.0256000.0700008MSOP3x3mmMatte Tine3
TC648EUA7130.0256000.2156008MSOP3x3mmMatte Tine3
TC648VUA0.0256000.0700008MSOP3x3mmMatte Tine3
TC648VUA7130.0256000.2156008MSOP3x3mmMatte Tine3
TC648 Datasheet TC648
TC648 Datasheet TC648
AN770 TC649B
AN771 TC649B
TB063 TC649B
Analog & Interface Guide (Volume 2) MCP23S08
Quick Guide to Microchip Development Tools ENC28J60
Fan Control Function Pack Design Guide TC670
Fan Management Solutions Product Overview TC670
Fan Speed Controller and Fan Fault Detector Family TC665
Analog & Interface Product Selector Guide ENC624J600
8-Pin SOIC/MSOP/TSSOP/DIP Evaluation Board User's Guide SOIC8EV
TC64X/TC64XB Fan Control Evaluation Board User's Guide TC649B
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