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TC646VPA, TC647VOA, TC648

Table of contents:
Info of TC646VPA
Info of TC647VOA
Info of TC648

TC646VPA, TC647VOA, TC648 Selling Leads, Datasheet

MFG:Microchip Technology Category:Integrated Circuits (ICs) Package Cooled:PDIP-8 D/C:DIP8

TC646VPA, TC647VOA, TC648 Datasheet download

Five Points

Part Number: TC646VPA

Category: Integrated Circuits (ICs)

MFG: Microchip Technology

Package Cooled: PDIP-8

D/C: DIP8

Description: IC PWM FAN SPEED CONTRLR 8-SOIC

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TC646VPA Parameters

Technical/Catalog Information	TC646VPA
Vendor	Microchip Technology
Category	Integrated Circuits (ICs)
Applications	Fan Controller, Brushless (BLDC)
Number of Outputs	1
Voltage - Supply	3 V ~ 5.5 V
Voltage - Load	-
Current - Output	-
Operating Temperature	0°C ~ 85°C
Package / Case	8-DIP (300 mil)
Packaging	Tube
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	TC646VPA TC646VPA

TC647VOA Parameters

Technical/Catalog Information	TC647VOA
Vendor	Microchip Technology
Category	Integrated Circuits (ICs)
Applications	Fan Controller, Brushless (BLDC)
Number of Outputs	1
Voltage - Supply	3 V ~ 5.5 V
Voltage - Load	-
Current - Output	-
Operating Temperature	0°C ~ 85°C
Package / Case	8-SOIC (3.9mm Width)
Packaging	Tube
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	TC647VOA TC647VOA

TC648 General Description

The TC648 is a switch mode fan speed controller for use with brushless DC motors. 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 of 1.25V to 2.65V(typical) for 0% to 100% PWM duty cycle. The TC648 can be configured to operate in either Auto-Shutdown or Minimum Speed mode. In Auto-Shutdown mode,fan operation is automatically suspended when measured temperature (VIN) is lower than a user-programmed minimum setting (VAS). The fan is automatically restarted and proportional speed control restored when VIN exceeds VAS (plus hysteresis). Operation in Minimum Speed mode is similar to Auto-Shutdown mode, except the fan is operated at a user-programmed minimum setting when measured temperature is low. An integrated Start-Up Timer ensures reliable motor start-up at turn-on, or when coming out of Shutdown mode. The over-temperature fault (OTF) is asserted when the PWM reaches 100% duty cycle, indicating a possible thermal runaway situation. The TC648 is packaged in a space-saving 8-pin plastic DIP, MSOP or SOIC package and is available in the industrial temperature range.

TC648 Maximum Ratings

Parameter Name	Value
Typical Accuracy (°C)	Depends on external thermistor
Over Temp Alert	yes
SM Bus	NO
Predictive Fan Fault	NO
Max. Supply Current (A)	1000
Max. Accuracy @ 25°C (°C)	Depends on external thermistor
Integrated Temp Sensor	No
Fan Sense	No
External Temp Input	Yes
Auto Shutdown	Yes
Device Description	Fan Manager
Temp Range (°C)	-40 to +85
Vcc Range (V)	+3.0 to +5.5

TC648 Features

• Temperature Proportional Fan Speed for Acoustic
Control and Longer Fan Life
• Efficient PWM Fan Drive
• 3.0V to 5.5V Supply Range:
- Fan Voltage Independent of TC648
Supply Voltage
- Supports any Fan Voltage
• Over-temperature Fault Detection
• Automatic Shutdown Mode for "Green" Systems
• Supports Low Cost NTC/PTC Thermistors
• Space Saving 8-Pin MSOP Package

TC648 Typical Application

• Power Supplies
• Computers
• Portable Computers
• Telecom Equipment
• UPSs, Power Amps
• General Purpose Fan Speed Control

TC648 Connection Diagram

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