35. NTC Selection & Design
Question.3
Sachin is designing a 230VAC SMPS with a large bulk electrolytic capacitor after the bridge rectifier. It is drawing a large power ON inrush current.
The SMPS draws 1.5A in a steady state.
The bridge rectifier can withstand surge current up to 50A. So, he needs an NTC to limit power-on inrush current below 50A.
Help him select the correct NTC.
Note — AC Peak mains voltage = 230V × √2 ≈ 325V.