TC647
The TC647 is a switch mode fan speed controller for use with brushless DC motors. Temperature proportional speed control is accomplished using pulse width modulation. A thermistor (or other voltage output temperature sensor) connected to VIN furnishes the required control voltage of 1.25V to 2.65V (typical) for 0% 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 TC647 also features Microchip Technology's proprietary FanSense™ ™ technology for increasing system reliability. In normal fan operation, a pulse train is present at SENSE, Pin 5, indicating normal operation. A Missing-pulse Detector monitors this pin during normal fan operation. A stalled, open, or unconnected fan causes the TC647 to trigger its start-up timer once. If the fault persists, the FAULT output goes low, and the device is latched in its Shutdown Mode. The TC647 is available in a standard 8-Pin PDIP, MSOP and SOIC packages. Commercial and industrial temperature ranges are available in both package options.
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 TC647 Supply Voltage Supports Any Fan Voltage!
- Supports Any Fan Voltage!
- FanSense™Fault Detection Circuits Protect Against Fan Failure and Aid
- System Testing
- Shutdown Mode for "Green" Systems
- Supports Low Cost NTC/PTC Thermistors
| Parameter|
Parameter Name
Value
| Value | |
Device Description
Fan Manager
|
Fan Manager
| |
Typical Accuracy (°C)
Depends on external thermistor
|
Depends on external thermistor
| |
Max. Supply Current (µA)
1000
|
1000
| |
Max. Accuracy @ 25°C (°C)
Depends on external thermistor
|
Depends on external thermistor
| |
Fan Sense
Yes
|
Yes
| |
External Temp Input
Yes
|
Yes
| |
High/Low PWM Freq
Low
|
Low
| |
Temp Range (°C)
-40 to +85
|
-40 to +85
| |
Vcc Range (V)
+3.0 to +5.5
|
+3.0 to +5.5
|
|
Documents
Ordering Information
| Part Number | Leads | Package Type | Temp Range | Packing | 1+ | 26+ | 100+ | 1000+ | 5000+ |
|---|
| TC647EOA | 8 | SOIC | -40C to +85C | TUBE | 1.40 | 1.16 | 1.06 | 1.02 | 1.01 |
| TC647EOATR | 8 | SOIC | -40C to +85C | T/R | 1.40 | 1.16 | 1.06 | 1.02 | 1.01 |
| TC647EUA | 8 | MSOP | -40C to +85C | TUBE | 1.30 | 1.09 | 0.99 | 0.95 | 0.94 |
| TC647EUATR | 8 | MSOP | -40C to +85C | T/R | 1.30 | 1.09 | 0.99 | 0.95 | 0.94 |
| TC647VOA | 8 | SOIC | 0C to +85C | TUBE | 1.32 | 1.10 | 1.00 | 0.97 | 0.96 |
| TC647VOATR | 8 | SOIC | 0C to +85C | T/R | 1.32 | 1.10 | 1.00 | 0.97 | 0.96 |
| TC647VPA | 8 | PDIP | 0C to +85C | TUBE | 1.35 | 1.13 | 1.02 | 0.99 | 0.98 |
| TC647VUA | 8 | MSOP | 0C to +85C | TUBE | ** | ** | ** | ** | ** |
Similar Devices
| Product | Description | Typical Accuracy (º) | Temp Range | Price5K |
|---|
| EMC2101 | | ±0.5 | -40 - +125 | $0.79 |
| EMC2300 | | ±0.25 | 0 - 70 | $1.24 |
| EMC6D102 | | ±0.25 | 0 - 70 | $1.63 |
| EMC6D103 | | ±0.25 | 0 - 70 | $1.80 |
| EMC6D103S | | ±0.25 | 0 - 70 | $1.80 |
| EMC6W201 | | ±0.25 | 0 - 70 | $2.19 |
| TC642 | Fan Manager | Depends on external thermistor | -40 - +85 | $1.02 |
| TC642B | Fan Manager | Depends on external thermistor | -40 - +85 | $0.84 |
| TC646 | Fan Manager | Depends on external thermistor | -40 - +85 | $1.02 |
| TC646B | Fan Manager | Depends on external thermistor | -40 - +85 | $0.84 |
| TC647 | Fan Manager | Depends on external thermistor | -40 - +85 | $0.94 |
| TC647B | Fan Manager | Depends on external thermistor | -40 - +85 | $0.84 |
| TC648 | Fan Manager | Depends on external thermistor | -40 - +85 | $0.85 |
| TC648B | Fan Manager | Depends on External Thermistor | -40 - +85 | $0.79 |
| TC649 | Fan Manager | Depends on external thermistor | -40 - +85 | $0.94 |
| TC649B | Fan Manager | Depends on external thermistor | -40 - +85 | $0.84 |
| TC650 | Fan Manager | 1 | -40 - +125 | $1.26 |
| TC651 | Fan Manager | 1 | -40 - +125 | $1.08 |
| TC652 | Fan Manager | 1 | -40 - +125 | $1.36 |
| TC653 | Fan Manager | 1 | -40 - 125 | $1.36 |
| TC654 | Dual SMBus Fan Manager | Depends on external thermistor | -40 - +85 | $1.43 |
| TC655 | Dual SMBus Fan Manager | Depends on external thermistor | -40 - +85 | $1.53 |
| TC664 | Single SMBus Fan Manager | Depends on external thermistor | -40 - +85 | $1.27 |
| TC665 | Single SMBus Fan Manager | Depends on external thermistor | -40 - +85 | $1.31 |
| TC670 | Predictive Fan Fault Detector | N/A | -40 - +85 | $0.94 |
RoHS Information
| PartNumber | DeviceWeight | ShippingWeight | LeadCount | PackageType | PackageWidth | SolderComposition | JEDECIndicator | RoHS | ChinaEFUP |
|---|
| TC647VPA | 0.486700 | 0.900000 | 8 | PDIP | .300in | Matte Tin | e3 |  |  |
| TC647BEPA | 0.486700 | 0.900000 | 8 | PDIP | .300in | Matte Tin | e3 | | |
| TC647EOA | 0.078000 | 0.160000 | 8 | SOIC | .150In(3.90mm) | Matte Tin | e3 | | |
| TC647EOATR | 0.078000 | 0.230303 | 8 | SOIC | .150In(3.90mm) | Matte Tin | e3 | | |
| TC647BEOA | 0.078000 | 0.160000 | 8 | SOIC | .150In(3.90mm) | Matte Tin | e3 | | |
| TC647BEOATR | 0.078000 | 0.230303 | 8 | SOIC | .150In(3.90mm) | Matte Tin | e3 | | |
| TC647VOATR | 0.078000 | 0.230303 | 8 | SOIC | .150In(3.90mm) | Matte Tin | e3 | | |
| TC647VOA | 0.078000 | 0.160000 | 8 | SOIC | .150In(3.90mm) | Matte Tin | e3 | | |
| TC647VUA | 0.025600 | 0.070000 | 8 | MSOP | 3x3mm | Matte Tin | e3 | | |
| TC647VUATR | 0.025600 | 0.215600 | 8 | MSOP | 3x3mm | Matte Tin | e3 | | |
| TC647BEUA | 0.025600 | 0.070000 | 8 | MSOP | 3x3mm | Matte Tin | e3 | | |
| TC647BEUATR | 0.025600 | 0.215600 | 8 | MSOP | 3x3mm | Matte Tin | e3 | | |
| TC647EUA | 0.025600 | 0.070000 | 8 | MSOP | 3x3mm | Matte Tin | e3 | | |
| TC647EUATR | 0.025600 | 0.215600 | 8 | MSOP | 3x3mm | Matte Tin | e3 | | |
