TPS54425: webench simulation failure

Ryoma Ohashi

Expert 5105 points

Part Number: TPS54425
Other Parts Discussed in Thread: TPS564242, TPS62135, TPS62903

Hit team,

My customer is tring to use TPS54425 and simulationg it on webench.

They say that they fail to simulate it if the Vin is under 5V

4.9V 1A 〇

4.75V 1A ×

<5V 2A ×

In the datasheet, the recommended operating condition for Vin is 4.5~

My customer is worried that the simulation failure means that that use case is not recommended.

Can the use this device in the real situation with the condition written above?

I guess this past thread is related to current issue.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/989845/tps54425-conditions-under-which-webench-does-not-work?tisearch=e2e-sitesearch&keymatch=TPS54425%20AND%20simulation#

Regards,

Ohashi

over 2 years ago

+1 Amod Vaze over 2 years ago

TI__Mastermind 26820 points

Hi Ohashi-san,

Yes high duty cycle conditions can cause min off-time violation on the TPS54425. You may want to look at the newer TPS564242 (95% max duty cycle) in such high duty cycle operation cases. There are other options as well like TPS62903 (3A) and TPS62135 (4A) which can do 100% duty cycle operation.

Thanks,

Amod

0 Ryoma Ohashi over 2 years ago in reply to Amod Vaze

TI__Expert 5105 points

Hi Amod,

>Yes high duty cycle conditions can cause min off-time violation on the TPS54425.

Does it mean that the can't simulate in that condition?

Or does it mean that TI don't reccomend to use this device in that condition in reality?

BTW, thanks for the newer device recommendation.

Regards,

Ohashi

+1 Amod Vaze over 2 years ago in reply to Ryoma Ohashi

TI__Mastermind 26820 points

Hi Ohashi-san,

Yes for very high duty cycle cases, the TPS54425 will not work correctly. I recommend checking the newer part I suggested.

Regards,

Amod

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TPS54425: webench simulation failure