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TC648BEUA713 Datasheet(PDF) 1 Page - Microchip Technology |
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TC648BEUA713 Datasheet(HTML) 1 Page - Microchip Technology |
1 / 36 page 2003 Microchip Technology Inc. DS21755B-page 1 M TC646B/TC648B/TC649B Features • Temperature-Proportional Fan Speed for Acoustic Noise Reduction and Longer Fan Life • Efficient PWM Fan Drive • 3.0V to 5.5V Supply Range: - Fan Voltage Independent of TC646B/ TC648B/TC649B Supply Voltage - Supports any Fan Voltage • FanSense™ 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 Applications • Personal Computers & Servers • LCD Projectors • Datacom & Telecom Equipment • Fan Trays • File Servers • General-Purpose Fan Speed Control Package Types Description The TC646B/TC648B/TC649B devices are new ver- sions of the existing TC646/TC648/TC649 fan speed controllers. These devices are switch-mode fan speed controllers that incorporate a new fan auto-restart func- tion. Temperature-proportional speed control is accom- plished using pulse width modulation. A thermistor (or other voltage output temperature sensor) connected to the VIN input supplies the required control voltage of 1.20V to 2.60V (typical) for 0% to 100% PWM duty cycle. The auto-shutdown threshold/temperature is set by a simple resistor divider on the VAS input. An inte- grated Start-Up Timer ensures reliable fan motor start- up at turn-on, coming out of shutdown mode, auto- shutdown 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 missing- pulse 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 avail- able in 8-pin plastic MSOP, SOIC and PDIP packages. The specified temperature range of these devices is -40 to +85ºC. MSOP, PDIP, SOIC 1 2 3 4 VDD 5 6 7 8 VOUT SENSE VIN CF VAS GND FAULT TC646B TC649B 1 2 3 4 VDD 5 6 7 8 VOUT NC VIN CF VAS GND OTF TC648B PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense™ Technology for Fault Detection |
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