TIDA-010042: Increasing output current to 30A in TIDA-010042 Mosfet based design

Cyril Sebastian

Part Number: TIDA-010042

Tool/software:

Hi,

I need to know, whether inductor need to be changed for supporting output current of 30A in TIDA-010042(old) mosfet based design(not GaN based ).Inductor used in the reference design is having a rated current of 30A and Isat(30%) of 18A.In reference design guide, it is mentioned only to change mosfet package. Please check the attached image.

Regards,

Cyril

9 months ago

0 Bowen Ling 9 months ago

TI__Intellectual 1130 points

Hi Cyril,

The topology of old TIDA-010042 is interleaved Buck, so the average current on one inductor is 0.5*Iout, which means if your output current is 30A, then on the inductor it should be 15A each. Only decreases 10% of the inductance. This inductor is okay.

Best,

Bowen

0 Cyril Sebastian 9 months ago in reply to Bowen Ling

Prodigy 220 points

Hi Bowen,

Thanks for your reply. I have found an inductor which is cheaper than TIDA-010042 inductor. But its saturation current is 15A @30% and rated current is 30A.Can I use that inductor if my maximum output current per phase is 15A

Regards,

Cyril

0 Bowen Ling 9 months ago in reply to Cyril Sebastian

TI__Intellectual 1130 points

Hi Cyril,

In theory, this inductor should be fine. The ripple current will be a little bigger.

Best,

Bowen

0 Cyril Sebastian 9 months ago in reply to Bowen Ling

Prodigy 220 points

Hi Bowen,

Thank you for your support.

Regards,

Cyril

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TIDA-010042: Increasing output current to 30A in TIDA-010042 Mosfet based design