| General > General Technical Chat |
| Inductor Help |
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| bigjoncoop:
hey, im trying to copy a lithium usb charging board based on the tp5000 ic.. im trying to design my own and have them assembled by jlbpcb since i can order a bunch and have them within 1 week instead of waiting a month.. ill post a picture of said board. **the schematic and datasheet just show a 4.7uh inductor but no other specs. but on jlcpcb parts inventory they have a bunch of 4.7uh smd inductors with different DC Resistance (DCR) and rated current... im assuming i need one with a rated current of my circuit but what about the DC Resistance (DCR)??? they range from 19mega ohm to 500 mega ohm... any ideas of which one would be best? [ Specified attachment is not available ] [ Specified attachment is not available ] |
| hagster:
Hopefully the DCR is in Milli ohms not Mega. A lower DCR is more efficient. You should also check the self resonant frequency SRF. This needs to be significantly higher than the switching frequency(800khz). |
| james_s:
I think that's probably milli ohm, not mega. 500 megohms would be ridiculously high for an inductor. Assuming it's milliohms you want the lowest possible in most cases. |
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