TPS60403: do the suggested capacitor values consider the degrading due the DC bias?

Aki Li

Part Number: TPS60403

As shown in the datasheet, recommended capacitor values are given. We'd like to check whether the values have considered the degrading due the DC bias for ceramic caps?

Customer is using 2.2uF for the output Co for TPS560403. Will it be a concern?

over 5 years ago

0 Davor Pavlovski over 5 years ago

TI__Expert 3611 points

Hi,

The capacitor's capacitance varies depending on the specified tolerance and as you mentioned the DC bias.

The recommended values specified in the datasheet do allow for some capacitance degradation.

It is best practice to use the capacitor models and manufacturers listed on page 14 of the datasheet for TPS60403.

Regards,

Davor

0 Aki Li over 5 years ago in reply to Davor Pavlovski

TI__Genius 9815 points

Davor,

Thank you. Since their former design used 2.2uF, do you think it is okay for them to keep it? It will lead to higher output ripples, right?

0 Davor Pavlovski over 5 years ago in reply to Aki Li

TI__Expert 3611 points

Hi,

The recommended capacitance to be used in the design as per the datasheet is 1uF.

Using 2.2uF should work, however we always recommend using the values listed in datasheet.

It should be mentioned that it is the customer's responsibility to verify that the design complies to their requirements.

Regards,

Davor

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TPS60403: do the suggested capacitor values consider the degrading due the DC bias?