| ??? 02/23/10 10:36 Modified: 02/23/10 11:26 Read: times |
#173459 - NTC or PTC ? Responding to: ???'s previous message |
Kiran V. Sutar said:
1. For SMPS we need to put a Thermistor to limit the in-rush current. So what should be the type NTC or PTC ? Think about it - what do the initials "NTC" and "PTC" stand for; and what do they mean...? 2. for SCR: What is the theory of using a thermistor in such an application? The text you quoted tells you the purpose of the thermistor; Uderstanding what "NTC" and "PTC" means will show you how this is achieved... 3. My Full Load Current is Max.25Amps.(@ 230VAC) so can a Thermistor pass this much current That depends entirely on the specific thermistor that you use - its Datasheet will answer this question directly! do I need to use an Inductor for this application? What purpose do you think that would serve? Are you confusing limiting the inrush to the power supply with limiting the dI/dt of a triac? |
