TPS54620 PVIN lower than Vin

Reiner Boettcher

Other Parts Discussed in Thread: TPS54620

Hello

I wanted to design a TPS54620 supply for 12V Vin=PVin to 1 V with 5A running at 600kHz on a board with high temperatures up to 70 degree C.

Simulations with Switcherpro and Webench showed a to high temperatur on the device.

With an input voltage of 5V the power dissipation and hence the temperature of the device is reduced.

I expect that a split input rail with Vin = 12V and PVin = 3.3V would reduce the temperature of the device even more.

How can I simulate or calculate such an design?

Regards

Reiner Boettcher

over 11 years ago

0 JohnTucker over 11 years ago

TI__Guru**** 191445 points

Even though the TPS54620 supports split rail operation, the design tools do not. So far as I know, there is no support for it. I'll see if there is any plan for it in the future.

0 Kenichiro over 8 years ago in reply to JohnTucker

Mastermind 9165 points

Hi Reiner, John,

So,3.5years passed now. Any good ideas now do we have??

Thanks,
Ken

0 JohnTucker over 8 years ago in reply to Kenichiro

TI__Guru**** 191445 points

TPS54620 has not been supported by me for many years. Now in 2017, it has returned to our group. Let me see what I can find out.

0 Kenichiro over 8 years ago in reply to JohnTucker

Mastermind 9165 points

Hey John, good to hear that it back again ; o )
Let me know, if you have something new!

Regards,
Ken

0 JohnTucker over 8 years ago in reply to Kenichiro

TI__Guru**** 191445 points

From the Webench team:

" It can be done, but we would need to set the priority on it. Efficiency calculations and the WEBENCH front-end GUI would have to be modified to take in the PVIN and update the efficiency computations. It depends on how important it is and we can balance it with rest of the workload."

So I would expect that we would need some number of additional users to request it.

0 Kenichiro over 8 years ago in reply to JohnTucker

Mastermind 9165 points

Hi, John

Thank you for sharing the situation. I see. I keep in mind and let you know, if I find important customer...

Thanks,
Ken

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TPS54620 PVIN lower than Vin