TPS54526: About max duty

Tsukui Yusuke

Guru 21930 points

Part Number: TPS54526
Other Parts Discussed in Thread: TPS54531

Hi,

Could you tell me about TPS54526 max duty?
I got the following question from the customer.

1.When searching for products on the website,

The duty cycle of TPS54526 was written as 95%.

However, the actual Max Duty is smaller than that.

Is this a mistake in description?

2.The actual duty calculation is below.
   Is my opinion correct?
   Vout max = Vin min * ( 1 - Fsw * 330E-9).

https://e2e.ti.com/support/power-management/f/196/t/508491?tisearch=e2e-quicksearch&keymatch=max%20duty%20tps54425

Customer condition is :
Vin=6V to 18V
Vout=5.5V
Iout=4A

Best Regards,
Yusuke

over 5 years ago

0 Yuchang Zhang over 5 years ago

TI__Mastermind 18510 points

Hi Yusuke,

Yes, you are correct, the max duty is limited by Toff.

I checked my product line, looks TPS54531 may match your application, but still can't fully support 6Vin/5.5Vout at corner case. but anyway you can check it first.

Yuchang

0 Tsukui Yusuke over 5 years ago in reply to Yuchang Zhang

Guru 21930 points

Hi Yuchang-san,

Thank you for your response.
Noted with thanks.

Duty value of the some Dcap2 product on the web is incorrect.
Are there plans to be fixed?

Best Regards,
Yusuke

0 Yuchang Zhang over 5 years ago in reply to Tsukui Yusuke

TI__Mastermind 18510 points

Hi Yusuke,
I will check with team, but not sure when can make it now.
Thanks for reminding.
Yuchang

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TPS54526: About max duty