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Details for TC646EUA by Microchip Technology
Electronic & Electrical Components > Semiconductors - ICs > Driver & Interface ICs
IC PWM FAN SPEED CNTRL 8-MSOP
TC646EUA image

TC646EUA by Microchip Technology

IC PWM FAN SPEED CNTRL 8-MSOP
Features
3.0V to 5.5V Supply Range:
Efficient PWM Fan Drive
Fan Voltage Independent of TC646 Supply Voltage
FanSenseu2122 Fault Detection Circuits Protect Against Fan Failure and Aid System Testing
Shutdown Mode for "Green" Systems
Supports Low Cost NTC/PT
Supports any Fan Voltage
Part Information
TC646EUA image
RoHS Compliant
Description
The TC646 is a switch mode, fan speed controller for use with brushless DC fans. Temperature proportional speed control is accomplished using pulse width mod- ulation (PWM). A thermistor (or other voltage output temperature sensor) connected to the VIN input fur- nishes the required control voltage of 1.25V to 2.65V (typical) for 0% 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 propri- etary FanSense™ 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 shut- down 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. 1 8 2 7 3 6 4 5 TC646 GND CF VIN VAS FAULT SENSE VDD
Specifications
Motor Type:
PWM
No. of Outputs:
1Outputs
Output Current:
5mA
Output Voltage:
4.4V
Driver Case Style:
MSOP
No. of Pins:
8Pins
Supply Voltage Min:
3V
Supply Voltage Max:
5.5V
Operating Temperature Min:
-40°C
Operating Temperature Max:
85°C
Product Range:
-
Automotive Qualification Standard:
-
RoHS Phthalates Compliant:
Yes
MSL:
MSL 1 - Unlimited
SVHC:
No SVHC (15-Jan-2018)
Base Number:
646
Frequency:
30Hz
Input Current:
500µA
Operating Temperature Range:
-40°C to +85°C
Supply Voltage Range:
3V to 5.5V
Alternate Descriptions
MOTOR DRIVER, PWM, 5mA, MSOP-8; Motor Type:PWM; No. of Outputs:1Outputs; Output Current:5mA; Output Voltage:4.4V; Driver Case Style:MSOP; No. of Pins:8Pins; Supply Voltage Min:3V; Supply Voltage Max:5.5V; Product Range:- RoHS Compliant: Yes Newark Electronics
PWM Fan Motor Speed Controller 8-Pin MSOP Tube Avnet America
Microchip TC646EUA Fan Controller IC, 5 V, 8-Pin MSOP Allied Electronics & Automation