Details, datasheet, quote on part number: TC648B
PartTC648B
CategorySensors => Temperature Sensors => Fan Controllers/Fan Fault Detectors
TitleFan Controllers/Fan Fault Detectors
DescriptionThe TC646B is a Version of The Existing TC646 Fan Speed Controller
CompanyMicrochip Technology, Inc.
DatasheetDownload TC648B datasheet
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Features, Applications

PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSenseTM Technology for Fault Detection

Features

Temperature-Proportional Fan Speed for Acoustic Noise Reduction and Longer Fan Life Efficient PWM Fan Drive to 5.5V Supply Range: - Fan Voltage Independent TC646B/ TC648B/TC649B Supply Voltage - Supports any Fan Voltage FanSenseTM Fault Detection Circuit Protects Against Fan Failure and Aids System Testing (TC646B/TC649B) Automatic Shutdown Mode for "Green" Systems Supports Low Cost NTC/PTC Thermistors Over-Temperature Indication (TC646B/TC648B) Fan Auto-Restart Space-Saving 8-Pin MSOP Package

Description

The TC646B/TC648B/TC649B devices are new versions of the existing TC646/TC648/TC649 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. The auto-shutdown threshold/temperature is set by a simple resistor divider on the VAS input. An integrated Start-Up Timer ensures reliable fan motor startup at turn-on, coming out of shutdown mode, autoshutdown mode or following a transient fault. A logic low applied to VIN (pin 1) causes fan shutdown. The TC646B and TC649B also feature Microchip Technology's proprietary FanSense 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 TC646B/ TC649B device to turn the VOUT output on full (100% duty cycle). If the fan 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 (TC646B) or OTF (TC648B) is also asserted if the PWM reaches 100% duty cycle, indicating that maximum cooling capability has been reached and a possible overheating condition exists. The TC646B, TC648B and TC649B devices are available in 8-pin plastic MSOP, SOIC and PDIP packages. The specified temperature range of these devices to +85C.

Applications

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

MSOP, PDIP, SOIC VIN CF 2 VAS 3 GND TC646B TC649B VDD VOUT FAULT SENSE

Control Logic CF Clock Generator 3xT PWM Timer Start-up Timer VSHDN Missing Pulse Detect 70 mV (typ)

Control Logic CF Clock Generator Start-up Timer VSHDN OTF

Name VIN CF VAS GND SENSE/NC FAULT/OTF VOUT VDD Function Analog Input Analog Output Analog Input Ground Analog Input. No Connect (NC) for TC648B Digital (Open-Drain) Output OTF for TC648B 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 , VAS Inputs Input Voltage at VIN for 100% PWM Duty Cycle Over-Temperature Indication Threshold Over-Temperature Indication Threshold Hysteresis VC(MAX) - VC(MIN) Hysteresis on Auto-Shutdown Comparator Auto-Shutdown Threshold Voltage Applied to VIN to Ensure Shutdown Mode Voltage Applied to VIN to Release Shutdown Mode Hysteresis on VSHDN , VREL VIN , VAS Input Leakage Note 1: 2: VC(MAX) VOTF VOTF-HYS VC(SPAN) VHAS VAS VSHDN VREL VHYST IIN 1.3 VC(MAX) VC(SPAN) VDD x VC(MAX) mV X VDD 1.5 VC(MAX) VDD mV A Note 1 VDD = 5V For TC646B and TC648B For TC646B and TC648B 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, VIN = 0.35V Conditions

Ensured by design, tested during characterization. For VDD < 3.7V, tSTARTUP and tMP timers are typically 13/f.


 

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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
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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
TC6501P075VCT The TC6501 Through TC6504 Are SOT-23 Temperature Switches That Require no External Components And The Design is Facilitated With Factory Programmed Temperature Thresholds
TC6501P075VCTTR The TC650/651 Are Integrated Temperature Sensors And Brushless DC Fan Speed Controllers
TC6501P095VCT The TC6501 Through TC6504 Are SOT-23 Temperature Switches That Require no External Components And The Design is Facilitated With Factory Programmed Temperature Thresholds
TC6501P095VCTTR The TC650/651 Are Integrated Temperature Sensors And Brushless DC Fan Speed Controllers
TC6501P105VCT The TC6501 Through TC6504 Are SOT-23 Temperature Switches That Require no External Components And The Design is Facilitated With Factory Programmed Temperature Thresholds
TC6501P105VCTTR The TC650/651 Are Integrated Temperature Sensors And Brushless DC Fan Speed Controllers
TC6501P115VCT 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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