|Category||Sensors => Temperature Sensors => Fan Controllers/Fan Fault Detectors|
|Title||Fan Controllers/Fan Fault Detectors|
|Description||The TC642 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors|
|Company||Microchip Technology, Inc.|
|Datasheet||Download TC642 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 TC642 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
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. Minimum fan speed is set by a simple resistor divider on the VMIN input. An integrated Start-up Timer ensures reliable motor start-up at turn-on, coming out of shutdown mode or following a transient fault. A logic low applied to VMIN (Pin 3) causes fan shutdown. The TC642 also 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 TC642 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 TC642 is available in the standard 8-pin plastic DIP, SOIC and MSOP packages and is available in the commercial, extended commercial and industrial temperature ranges.Applications
Power Supplies Personal Computers File Servers Telecom Equipment UPSs, Power Amps, etc. General Purpose Fan Speed Control3 x TPWM Timer Clock Generator VMIN VSHDN
*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.
Absolute Maximum Ratings* Supply Voltage......................................................... 6V Input Voltage, Any Pin.... (GND 0.3V) 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°CElectrical Characteristics: TMIN TA < TMAX, VDD to 5.5V, unless otherwise specified.
Symbol VDD IDD IDD(SHDN) Parameter Supply Voltage Supply Current, Operating Supply Current, Shutdown Mode 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, = 1 µF, VMIN = 0.35V, Note 1 Note 1 Test ConditionsIIN VOUT Output tR tF tSHDN IOL IOH VIN , VMIN Inputs VC(MAX), VOTF VC(SPAN) VSHDN VREL
VIN , VMIN Input Leakage VOUT Rise Time VOUT Fall Time Pulse Width (On VMIN ) to Clear Fault Mode Sink Current at VOUT Output Source Current at VOUT Output Input Voltage at VIN or VMIN for 100% PWM Duty Cycle VC(MAX) - VC(MIN) Voltage Applied to VMIN to ensure Shutdown Mode Voltage Applied to VMIN to Release Shutdown Mode
IOH = 5 mA, Note 1 IOL = 1 mA, Note 1 VSHDN , VHYST Specifications, Note 1 VOL 10% of VDD VOH 80% of VDD
Pulse Width Modulator FPWM SENSE Input VTH(SENSE) FAULT Output VOL tMP tSTARTUP tDIAG Output Low Voltage Missing Pulse Detector Timer Start-up Timer Diagnostic Timer 0.3 V Sec IOL 2.5 mA SENSE Input Threshold Voltage with Respect to GND 90 mV Note 1 PWM Frequency 1.0 µF
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