Details, datasheet, quote on part number: TC646
PartTC646
CategorySensors => Temperature Sensors => Fan Controllers/Fan Fault Detectors
TitleFan Controllers/Fan Fault Detectors
DescriptionThe TC646 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
CompanyMicrochip Technology, Inc.
DatasheetDownload TC646 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 TC646 Supply Voltage - Supports any Fan Voltage FanSenseTM Fault Detection Circuits Protect Against Fan Failure and Aid System Testing Shutdown Mode for "Green" Systems Supports Low Cost NTC/PTC Thermistors Space Saving 8-Pin MSOP Package Over-temperature Indication

PWM Fan Speed Controller with Auto-Shutdown and FanSenseTM Technology

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 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, auto-shutdown mode or following a transient fault. The TC646 features Microchip Technology's proprietary FanSenseTM technology for increasing system reliability. In normal fan operation, a pulse train is present at SENSE (Pin 5). A missing-pulse detector monitors this pin during fan operation. A stalled, open, or unconnected fan causes the TC646 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% duty cycle, indicating a possible thermal runaway situation, although the fan continues to run. See Section 5.0, "Typical Applications", for more information and system design guidelines. The TC646 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 File Servers Portable Computers Telecom Equipment UPS, 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 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 Pulse Width(On VIN ) to Clear Fault Mode 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

IOL IOH SENSE Input VTH(SENSE) FAULT Output VOL tMP tSTARTUP tDIAG
SENSE Input Threshold Voltage with Respect to GND
Output Low Voltage Missing Pulse Detector Timer Start-up Timer Diagnostic Timer

 

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TC646E
TC646EOA
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TC646EUA
TC646EUA713
TC646VOA
TC646VOA713
TC646VPA
TC646VUA
TC646VUA713
Some Part number from the same manufacture Microchip Technology, Inc.
TC646B The TC646B is a Version of The Existing TC646 Fan Speed Controller
TC646E The TC646 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC646EPA PWM Fan Speed Controller With Auto-shutdown And Fansense Technology
TC646EUA The TC646 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC647 The TC647 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC647B The TC642B is a Version of The Existing TC642 Fan Speed Controller
TC647E The TC647 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC647EPA PWM Fan Speed Controller With Fansense Technology
TC647EUA The TC647 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC648 The TC648 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC648B The TC646B is a Version of The Existing TC646 Fan Speed Controller
TC648E The TC648 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC649 The TC649 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC649B The TC646B is a Version of The Existing TC646 Fan Speed Controller
TC649E The TC649 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC649EPA PWM Fan Speed Controller With Auto-shutdown And Fansense Technology
TC649EUA The TC649 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC650 The TC650/651 Are Integrated Temperature Sensors And Brushless DC Fan Speed Controllers
TC6501 The TC6501 Through TC6504 Are SOT-23 Temperature Switches That Require no External Components And The Design is Facilitated With Factory Programmed Temperature Thresholds
TC6501N015VCTTR The TC650/651 Are Integrated Temperature Sensors And Brushless DC Fan Speed Controllers
TC6501P045VCT The TC6501 Through TC6504 Are SOT-23 Temperature Switches That Require no External Components And The Design is Facilitated With Factory Programmed Temperature Thresholds
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