jelliott
Member
Is there an easy way to use a frequency-to-voltage IC to switch off a relay when the tach output of a brushless DC fan falls below a certain threshold?
Based on Figure 20 in the LM2097/LM2917 datasheet, the answer would appear to be 'yes,' but it's not even apparent to me from the datasheet how much load current the chip can pull. Has anyone on here been through this before?
The fan's tach output is two pulses per rev, and I want to pull power from the load if its speed falls below roughly 1500 RPM.
Thanks!
Based on Figure 20 in the LM2097/LM2917 datasheet, the answer would appear to be 'yes,' but it's not even apparent to me from the datasheet how much load current the chip can pull. Has anyone on here been through this before?
The fan's tach output is two pulses per rev, and I want to pull power from the load if its speed falls below roughly 1500 RPM.
Thanks!