LM27 National Semiconductor, LM27 Datasheet - Page 7
LM27
Manufacturer Part Number
LM27
Description
Factory Preset Thermostat
Manufacturer
National Semiconductor
Datasheet
1.LM27.pdf
(10 pages)
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Typical Applications
20030703
Note: The fan’s control pin has internal pull-up. The 10k pull-down sets a slow fan speed. When the output of the LM27 goes low, the fan will speed up.
FIGURE 4. Two Speed Fan Speed Control
20030720
FIGURE 5. Fan High Side Drive
20030721
FIGURE 6. Fan Low Side Drive
7
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