35. NTC Selection & Design

Question.2

The datasheet of an NTC inrush current limiter shows:
• R₂₅ (cold): 10Ω
• R_hot : 0.3Ω
The NTC is used in SMPS.
During normal steady-state operation of the SMPS, what is the resistance present across NTC?

~ 10Ω - Cold R
~ 0.3Ω - Hot R
~ 5.15Ω — average of both R
Between 0.3Ω to 10Ω

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