Details, datasheet, quote on part number: TC642BEPA
PartTC642BEPA
CategorySensors => Temperature Sensors => Fan Controllers/Fan Fault Detectors
TitleFan Controllers/Fan Fault Detectors
DescriptionThe TC642B is a Version of The Existing TC642 Fan Speed Controller
CompanyMicrochip Technology, Inc.
DatasheetDownload TC642BEPA datasheet
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Features, Applications
Features
Description

The TC642B/TC647B devices are new versions of the existing TC642/TC647 fan speed controllers. These devices are switch mode, fan speed controllers that incorporate a new fan auto-restart function. Temperature-proportional speed control is accomplished using pulse width modulation. A thermistor (or other voltage output temperature sensor) connected to the VIN input supplies the required control voltage to 2.60V (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 TC642B and TC647B also feature Microchip Technology's proprietary FanSenseTM technology for increasing system reliability. In normal fan operation, a pulse train is present at SENSE (pin 5). A missingpulse detector monitors this pin during fan operation. A stalled, open or unconnected fan causes the TC642B/ TC647B device to turn the VOUT output on full (100% duty cycle). If the fault persists (a fan current pulse is not detected within a 32/f period), the FAULT output goes low. Even with the FAULT output low, the VOUT output is on full during the fan fault condition in order to attempt to restart the fan. FAULT is also asserted if the PWM reaches 100% duty cycle (TC642B only), indicating that maximum cooling capability has been reached and a possible overheating condition exists. The TC642B and TC647B devices are available in 8-pin plastic MSOP, SOIC and PDIP packages. The specified temperature range of these devices to +85C.

PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSenseTM Technology for Fault Detection

Temperature-Proportional Fan Speed for Acoustic Noise Reduction and Longer Fan Life Efficient PWM Fan Drive to 5.5V Supply Range: - Fan Voltage Independent of TC642B/TC647B Supply Voltage - Supports any Fan Voltage FanSenseTM Fault Detection Circuit Protects Against Fan Failure and Aids System Testing Shutdown Mode for "Green" Systems Supports Low Cost NTC/PTC Thermistors Over-Temperature Indication (TC642B only) Fan Auto-Restart Space-Saving 8-Pin MSOP Package

Applications

Personal Computers & Servers LCD Projectors Datacom & Telecom Equipment Fan Trays File Servers General Purpose Fan Speed Control

MSOP, PDIP, SOIC VIN CF 2 VMIN 3 GND TC642B TC647B VDD VOUT FAULT SENSE
VOTF Note Note: The VOTF comparator is for the TC642B device only.
Control Logic CF Clock Generator VMIN VSHDN 3xTPWM Timer Start-up Timer Missing Pulse Detect

Name VIN CF VMIN GND SENSE FAULT VOUT VDD Function Analog Input Analog Output Analog Input Ground Analog Input Digital (Open-Drain) Output Digital Output Power Supply Input

Supply Voltage (VDD ).......................................................6.0V Input Voltage, Any Pin................(GND 0.3V) to (VDD +0.3V) Operating Temperature Range....................- to +125C Maximum Junction Temperature, TJ........................... +150C ESD Protection on all pins........................................... 3 kV Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.

Electrical Specifications: Unless otherwise specified, all limits are specified for < +85C, VDD to 5.5V. Parameters Supply Voltage Supply Current, Operating Supply Current, Shutdown Mode VOUT Output Sink Current at VOUT Output Source Current at VOUT Output VIN , VMIN Inputs Input Voltage at VIN or VMIN for 100% PWM Duty Cycle Over-Temperature Indication Threshold Over-Temperature Indication Threshold Hysteresis VC(MAX) - VC(MIN) Minimum Speed Threshold Voltage Applied to VMIN to Ensure Shutdown Mode Voltage Applied to VMIN to Release Shutdown Mode Hysteresis on VSHDN , VREL VIN , VMIN Input Leakage Pulse-Width Modulator PWM Frequency Note 1: 2: fPWM 1.0 F Ensured by design, tested during characterization. For VDD < 3.7V, tSTARTUP and tMP timers are typically 13/f. VC(MAX) VOTF VOTF-HYS VC(SPAN) VMIN V SHDN VREL VHYST IIN 1.3 VC(MAX) VC(SPAN) VDD x VDD 2.45 2.60 VC(MAX) 1.4 1.5 VC(MAX) VDD mV A Note 1 VDD = 5V For TC642B Only For TC642B Only IOL IOH 5.0 mA VOL 10% of VDD VOH 80% of VDD Sym VDD IDD IDD(SHDN) Min 3.0 Typ 200 30 Max 5.5 400 Units V A Pins 6, 7 Open, = 1 F, VIN = VC(MAX) Pins 6, 7 Open, = 1 F, VMIN = 0.35V Conditions


 

Related products with the same datasheet
TC642BCPA
TC642BEOA
TC642BEUA
TC647B
TC647BEOA
TC647BEPA
TC647BEUA
Some Part number from the same manufacture Microchip Technology, Inc.
TC642BEUA The TC642B is a Version of The Existing TC642 Fan Speed Controller
TC642COA The TC642 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC642EV PWM Fan Speed Controller With Fansense Technology
TC642VOA The TC642 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
TC646 The TC646 is a Switch Mode Fan Speed Controller For Use With Brushless DC Motors
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
 
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