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FSCT11A-UH5 Dataheets PDF



Part Number FSCT11A-UH5
Manufacturers STMicroelectronics
Logo STMicroelectronics
Description FAN SPEED CONTROLER
Datasheet FSCT11A-UH5 DatasheetFSCT11A-UH5 Datasheet (PDF)

® FSCTxxA-UH5 A.S.D.TM Application Specific Discretes FAN SPEED CONTROLER APPLICATIONS COMPUTER AND SERVER POWER SUPPLY TELECOM LOW COST VENTILATION (consumer) s s s FEATURES Built in thermal sensor Brushless DC fan speed control Linear control and regulation of the fan speed according to the temperature Green OFF mode operation with automatic turn- ON in case of overtemperature Voltage limitation above fan stall voltage No external NTC required s s s s s s 5 1 IPPAK Fig. 1: Block Diagram.

  FSCT11A-UH5   FSCT11A-UH5


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® FSCTxxA-UH5 A.S.D.TM Application Specific Discretes FAN SPEED CONTROLER APPLICATIONS COMPUTER AND SERVER POWER SUPPLY TELECOM LOW COST VENTILATION (consumer) s s s FEATURES Built in thermal sensor Brushless DC fan speed control Linear control and regulation of the fan speed according to the temperature Green OFF mode operation with automatic turn- ON in case of overtemperature Voltage limitation above fan stall voltage No external NTC required s s s s s s 5 1 IPPAK Fig. 1: Block Diagram. ON BENEFITS Low cost integrated fan speed control High integration: only one or two external components Reduced acoustic noise because of the linear control of the external transistor Power supply noise rejection Good thermal coupling with heater Reduced ON/OFF oscillation because of large hysteresis High current capability (base current higher than 10 mA) Higher accuracy than discrete circuit with NTC s s s s s s s s BIAS FSCTxxA-UH5 F VCC VOLTAGE REF. ON/OFF LOW HYSTERESIS COMPARATOR HYST.-EN ON/OFF HIGH ON REGULATION OUT TEMP. SENSOR VT DRIVER COUT= 100nF GND GENERAL DESCRIPTION The FSCTxxA-UH5 is a high-integrated low cost fan speed controller suitable for PC desktops, notebooks and server power supplies and also all kind of equipments where low cost ventilation system is needed. An internal thermal sensor connected to the tab is used to regulate the fan speed. A continuous analog voltage proportional to the tab temperature is produced at the OUT terminal and can control linearly an external PNP transistor (Fan Transistor) connected in series with a Brushless DC Fan, in order to vary its speed. The ON control terminal can be used to select two operation modes. If not connected (high impedance state) ON mode is selected by default. In Mode ON, the fan speed is regulated according to the tab temperature of the FSCT by adjusting the Vbe voltage of the PNP fan Transistor. In low temperature conditions, the fan transistor voltage is limited to about 5.5V (for a 12V fan) in order to guarantee a minimum voltage across the fan above its stalling voltage and to keep it running (see figure 3). This regulation is implemented with a high Fan supply voltage rejection. www.DataSheet4U.com The mode OFF allows to operate in green Mode. The fan is stopped as long as the temperature remains below the TON threshold. When the temperature rises above TON the fan is forced to ON and the speed is regulated according to the temperature as in the same way as mode ON. When temperature falls below TOFF, the fan is automatically turned OFF. The hysteresis has been dimensioned large enough to reduce ON/OFF oscillations during the green mode operation. September 2003 - Ed: 2A 1/11 FSCTxxA-UH5 PINT OUT DESIGNATION Pint Out designation TEST VCC GND ON OUT Operating DC supply Ground (internally connected to the tab) Mode ON and OFF selection Output (connect to PNP fan transistor base) Description Test pin (must not be connected) Pin 1 2 3 4 5 ABSOLUTE MAXIMUM RATINGS Symbol VCC Tj Tstg TL Parameter Supply voltage referenced to GND Operating junction temperature Storage temperature Lead temperature (double wave soldering) Maximum voltage at any pin Minimum voltage at any pin ESD Electrostatic discharge immunity at each terminal (human body model) Value -0.3 to 20 0 to 125 -65 to 150 260 VCC -0.3 2 Unit V °C °C °C V V kV ELECTRICAL CHARACTERISTICS (Continue) VCC from 9Vdc to 15Vdc, Cout = 100nF, Tj = 0°C to 125°C, otherwise specified Symbol SUPPLY ICCmax DRIVER IOL ILEAK Sinking current capability VOUT = VOL and Tj = 125°C at the OUT terminal Maximum sink leakage VOUT = 20V, VON = 0V current at OUT pin (mode Tj = 50°C OFF) Minimum voltage at the VON = 5V, Tj = 125°C OUT terminal (mode ON) OUT voltage for minimum fan speed (mode ON) Static line regulation KSL www.DataSheet4U.com Parameter Test conditions Value Min. Typ. 1.1 Max. 3 Unit Operating supply current VON = 5V or 0V VCC = 12V 10 mA mA 10 µA VOL VOMS 0.55 5.3 0.7 5.5 V V VON = 5V, Tj from 0°C to TMS VCC = 9V to 15V, VON = 5V Tj = 25°C VOUT = 80% FSCT17A-UH5 VOMS to FSCT11A-UH5 20% VOMS FSCT07A-UH5 155 100 68 0.5 165 107 72 175 114 77 mV/V mV/°C VOUT temperature slope 2/11 FSCTxxA-UH5 ELECTRICAL CHARACTERISTICS (Continue) VCC within the supply voltage range, Cout = 100nF, Tj = 0°C to 125°C, otherwise specified Symbol Parameter Test conditions Value Max. 42 76 44 71 86 107 55 62 72 V 0.3 10 25 V µA °C Unit Min. Typ. TEMPERATURE MANAGEMENT (all T° threshold are guaranteed by design) TMS TON TOFF TOL Temperature regulation VOUT = VOMS VON = 5V threshold OFF mode switch ON temperature OFF mode switch OFF temperature Minimum temperature for maximum speed VCC = 12V VON = 0V VCC = 12V VON = 0V VCC = 12V VON = 5V VOUT = VOL VOUT = 3V VON = 5V FSCT17A-UH5 FSCT11A-UH5 FSCT07A-UH5 TV3 Tab temperature for VOUT = 3V (*) (see figure 3) FSCT17A-UH5 FSCT11A-UH5 FSCT07A-UH5 ON SIGNAL VIH VIL IS Voltage range for ON mode Voltage range for OFF mode Source current at the ON pin.


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