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NCP1239 Fault pin current

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cupoftea

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Hi,
The NCP1239 has a fault pin, for use in overtemperature shutdown.
A 44uA current flows out of it. You shoudl connect an NTC to it.
This then produces a voltage, and if under 0.43V, then you trip on overtemp.

But most NTCs are 10k at 25c...and 10k*44uA = 0.44V.

This seems a bit too near to the trip point, may i ask have i missed something.?

NCP1239
 

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