Im currently trying to design a 12v to 5v step down PCB which revolves around the LM22673 chip (Buck Switching Regulator) to provide 5v 3A power to power two USB ports for a Raspberry Pi 4 and Screen in a car.
I sent my first circuit board request to a vendor in China before realising, oh whoops, I've used 6mil trace widths on the power, the circuits going to melt quite quickly. So I'm redesigning. I can certainly up the trace widths using 1oz copper to 35.3mil.
However I've now realised something I cannot see in the specs. I've got the Output current, but not the Input current. So how am I supposed to know what the trace widths should be for this? The betting man in me is looking at the (relatively) huge inductor and thinking that this is where the bulk of the work occurs and everything before the inductor will probably still be minimal amps.
I also have some TPS2001C chips too for additional USB ports
Any thoughts to help a beginner?
Simon
I sent my first circuit board request to a vendor in China before realising, oh whoops, I've used 6mil trace widths on the power, the circuits going to melt quite quickly. So I'm redesigning. I can certainly up the trace widths using 1oz copper to 35.3mil.
However I've now realised something I cannot see in the specs. I've got the Output current, but not the Input current. So how am I supposed to know what the trace widths should be for this? The betting man in me is looking at the (relatively) huge inductor and thinking that this is where the bulk of the work occurs and everything before the inductor will probably still be minimal amps.
I also have some TPS2001C chips too for additional USB ports
Any thoughts to help a beginner?
Simon