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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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LM79 数据表(PDF) 19 Page - National Semiconductor (TI) |
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LM79 数据表(HTML) 19 Page - National Semiconductor (TI) |
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19 / 31 page  Functional Description (Continued) Counts are based on 2 pulses per revolution tachometer outputs. RPM Time per Revolution Counts for “Divide by 2” Comments (Default) in Decimal 4400 13.64 ms 153 counts Typical RPM 3080 19.48 ms 219 counts 70% RPM 2640 22.73 ms 255 counts 60% RPM (maximum counts) Mode Select Nominal RPM Time per Revolution Counts for the 70% RPM Time per Revolution Given Speed in Decimal for 70% RPM Divide by 1 8800 6.82 ms 153 6160 9.74 ms Divide by 2 4400 13.64 ms 153 3080 19.48 ms Divide by 4 2200 27.27 ms 153 1540 38.96 ms Divide by 8 1100 54.54 ms 153 770 77.92 ms DS100036-14 (a) Fan with Tach Pull-Up to +5V DS100036-15 (b) Fan with Tach Pull-Up to +12V, or Totem-Pole Output and Resistor Attenuator DS100036-16 (c) Fan with Tach Pull-Up to +12V and Diode Clamp DS100036-17 (d) Fan with Strong Tach Pull-Up or Totem Pole Output and Diode Clamp FIGURE 9. Alternatives for Fan Inputs www.national.com 19 |
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