TPS54160A: Inductor Selection

jediengineer

Part Number: TPS54160A

Tool/software:

I've been designing power converters using the TPS54160ADRCR but I've noticed that the inductor calculation on page 32 of the datasheet only specifies the output current, not a minimum or maximum. I've noticed in calculating for various loads, that as my load decreases, the inductance increases for a given fixed frequency. This can be problematic if space on the PCB is limited, but I'm also unsure of which way to design with the inductor. If I'm designing for a transient load, ranging from 50mA to 1.25A, should I use the larger inductance or the smaller? Is there any loss if I use the inductor rated for the larger current load, but I operate at the lower current load?

over 1 year ago

0 Nityanand Hegde over 1 year ago

TI__Expert 5520 points

Hi,

To keep the inductor ripple same wr.t load current, the inductance value required is higher for lower output load current for same switching frequency.

If you are designing the buck converter, the inductor value has to be chosen for higher load current. In your above case, it is 1.25A.

There are multiple App notes available on web, you can refer. Attaching the few App notes from TI on how to select inductors for DC_DC converters.

1. https://www.ti.com/lit/an/snva038b/snva038b.pdf?ts=1723518150344&ref_url=https%253A%252F%252Fwww.google.com%252F

2. https://www.ti.com/lit/an/slva057/slva057.pdf?ts=1723518614255

Thanks,

Nitya

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TPS54160A: Inductor Selection