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TC651BBVUA Folha de dados(PDF) 6 Page - Microchip Technology |
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TC651BBVUA Folha de dados(HTML) 6 Page - Microchip Technology |
6 / 14 page TC650/TC651 DS21450B-page 6 © 2002 Microchip Technology Inc. 3.4 Shutdown (SHDN) The fan can be unconditionally shutdown by pulling low the SHDN pin. During shutdown, the PWM output is low. This is ideal for notebook computers and other portable applications when you need to change batteries and must not have the fan running at that time. Thermal monitoring and TOVER are still in operation during shutdown. IDD shutdown current is around 50 µA. 3.5 Auto-Shutdown Mode The TC651 features auto-shutdown; when the temperature is below the factory set point at minimum speed (TL), PWM is low and the fan is automatically shut off (Auto-shutdown mode). This feature is ideal for notebook computers and other portable equipment that need to conserve as much battery power as possible and thus run a fan when it is only absolutely needed. The TC651 will continue to be active so as to monitor temperature for Tover. The TC651 exits Auto-shutdown mode when the temperature rises above the factory set point (T1). 3.6 Temperature Selection Guide (Minimum Fan Speed/Full Speed) The five temperature regions defined by the six thresholds are defined in the TC650/TC651 by means of factory trimming. Once a TL and TH are set, the T1 – T4 thresholds are automatically equally spaced between TL and TH. Note: The Bold Type temperature settings are available for ordering. Contact factory for other temperature selec- tions. TL and TH canbeselectedin5°C increments. TH must be chosen at least 10oC higher than TL.TL can range anywhere from 25°C to 35°C. As an example, suppose you wanted the fan to run at 40% speed at 25°C or less and go to full speed at 45°C. You would order the part number TC650AEVUA. As another example, suppose you wanted the fan to turn on at 30°C and go to full speed at 45°C. You would order the part number TC651BEVUA. Temp. Range TL TH Part # 10°C 25 35 AC 30 40 BD 35 45 CE 15°C 25 40 AD 30 45 BE 35 50 CF 20°C 25 45 AE 30 50 BF 35 55 CG 30°C 25 55 AG |
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