Other Parts Discussed in Thread: LM25148, LM706A0
My first question is: Why is the LM5148 so cheap?
It may sound a bit strange, but the LM5148 is actually much less expensive than the LM25148, and even cheaper than some other DC-DC converters with lower performance. Is there any specific reason for this? Is it simply a temporary promotion and the price will go up later?
My second question is: When selecting FETs for the high-side switch and low-side switch, which specifications should be considered most important?
As far as I understand, for the high-side FET the switching loss is dominant, so Qg is the most important, and for the low-side FET the conduction loss is dominant, so Rds(on) is important. However, I’m not sure what concrete values I should be targeting when selecting these FETs.
For example, when converting from 24 V to 5 V at 10 A, or from 24 V to 12 V at 4 A, what kind of FETs should I select, and based on what criteria?
