General > General Technical Chat
Inductor Help
(1/1)
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.
Navigation
[0] Message Index
Go to full version