|Category||Power Management => PWM Controllers|
|Description||PWM Fan Speed Controller With Auto-shutdown And Fansense Technology|
|Company||Microchip Technology, Inc.|
|Datasheet||Download TC646EPA datasheet
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 IndicationPWM 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)............................................. 125°C/W SOIC (RJA)............................................ 155°C/W MSOP (R JA).......................................... 200°C/W Specified Temperature Range........... to +125°C Storage Temperature Range.............. to +150°C
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 µA Pins 6, 7 Open, = 1 µF, VIN = VC(MAX) Pins 6, 7 Open; Note CF =1 µF, VIN = 0.35V Note 1 Test ConditionsIOL 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
|Some Part number from the same manufacture Microchip Technology, Inc.|
|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|
|TC6501P045VCTTR The TC650/651 Are Integrated Temperature Sensors And Brushless DC Fan Speed Controllers|
|TC6501P065VCT The TC6501 Through TC6504 Are SOT-23 Temperature Switches That Require no External Components And The Design is Facilitated With Factory Programmed Temperature Thresholds|
|TC6501P065VCTTR The TC650/651 Are Integrated Temperature Sensors And Brushless DC Fan Speed Controllers|
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