Other Parts Discussed in Thread: TPS56637, , LM25148, LM61495
I've been looking at datasheets and getting close, but I could use a TI recommendation for a 5V power supply to cover multiple variations of a product we're developing.
Load consists of a logic circuit that is always on drawing minimal current (est <= 20mA). On demand, LED arrays are turned on either steady on or flashing at 4Hz. The LED Load min 230mA at 5V. The max LED load is dependent on the product, which is either 2.25A, 3.75A or 6A or 8.75A. Most of the time the load is somewhere in the middle but those are worst case scenario current loads.
Input voltage is 10-30Vdc from a Class 2 industrial power supply (external). The product will be tested to FCC 15 A (which is apparently closely related to CISPR 11/32), UL 2108, IEC 61000-6-2 and -4.
It'd be good to have the same pinout with output current ratings that match up well to the LED Load requirements for each product with buck converters that have same pin out. I've been looking at units with an integrated FET or integrated inductor. Power Good output (or fault) would be good. Isolation is not necessary. Otherwise, there is nothing special required- just a dynamically responsive 5V source with enough load current and will pass all these testing standards.
The search is narrowed down to a few options:
- TPS56637/56837/56A37 however I'm not sure how well that will do for EMI
- LM62460/61480/61495 looks like it would be good for light load & low EMI
Possibly, an external FET makes more sense with a single buck converter? The lowest current product (2.25A) has some space constraints. LM25148 keeps coming up if an external FET is used.
We've been looking at doing this for awhile and sort of have to do it now. I don't have enough experience to know the pitfalls. It would seem that a design with low component count and simple layout will put us in a better position as a result. I'd appreciate any recommendations!!
