Details, datasheet, quote on part number: TC648VUA713
PartTC648VUA713
CategorySensors => Temperature Sensors => Fan Controllers/Fan Fault Detectors
TitleFan Controllers/Fan Fault Detectors
DescriptionThe TC648 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
CompanyMicrochip Technology, Inc.
DatasheetDownload TC648VUA713 datasheet
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Features, Applications
Features

Temperature Proportional Fan Speed for Acoustic Control and Longer Fan Life Efficient PWM Fan Drive 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 Space Saving 8-Pin MSOP Package

Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert

The is a switch mode, fan speed controller for use with brushless DC fans. 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 to 2.65V (typical) for 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, with the exception that the fan is operated at a user programmed minimum setting when the measured temperature is low. An integrated Start-up Timer ensures reliable motor start-up at turn-on, and when coming out of shutdown or auto-shutdown mode. The over-temperature fault output (OTF) is asserted when the PWM reaches 100% duty cycle, indicating a possible thermal runaway situation. The TC648 is available in the 8-pin plastic DIP, SOIC and MSOP packages and is available in the industrial and extended commercial temperature ranges.

Applications

Power Supplies Computers Portable Computers Telecom Equipment UPSs, Power Amps General Purpose Fan Speed Control

*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Supply Voltage......................................................... 6V Input Voltage, Any Pin... (GND 0.3V) to (VDD + 0.3V) Package Thermal Resistance: PDIP (RJA)............................................. 125C/W SOIC (RJA)............................................ 155C/W MSOP (R JA).......................................... 200C/W Specified Temperature Range........... to +125C Storage Temperature Range.............. to +150C

Electrical Characteristics: Unless otherwise specified, TMIN TA TMAX, VDD to 5.5V Symbol VDD IDD IDD(SHDN) Parameter Supply Voltage Supply Current, Operating Supply Current, Shutdown/ Auto-shutdown Mode VIN, VAS Input Leakage VOUT Rise Time VOUT Fall Time Sink Current at VOUT Output Source Current at V OUT Output Min 3.0 Typ 0.5 25 Max 5.5 1.0 Units mA A Pins 6, 7 Open, = 1 F, VIN = VC(MAX) Pins 6, 7 Open; Note CF =1 F, VIN = 0.35V Note 1 Test Conditions

IIN VOUT Output tR tF IOL IOH SENSE Input VTH(SENSE) OTF Output VOL
SENSE Input Threshold Voltage with Respect to GND

VIN , VAS Inputs VC(MAX),VOTF Voltage at VIN for 100% Duty Cycle and Overtemp. Fault VC(SPAN) VAS VSHDN VREL VHYST VHAS VC(MAX) - VC(MIN) Auto-shutdown Threshold Voltage Applied to VIN to Ensure Reset/Shutdown Voltage Applied to VIN to Release Reset Mode Hysteresis on V SHDN, VREL Hysteresis on Auto-shutdown Comparator 1.3 V C(MAX) ~ VC(SPAN) VDD 2.8 1.5 VC(MAX) VDD = 5V


 

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