TPS62135: Design Review

Llewellyn Dsa

Prodigy 120 points

Part Number: TPS62135
Other Parts Discussed in Thread: TPS562231,

Hi,

I need a design review of the attached schematic.SCH_BH_AE_02_R1.3.PDF

over 5 years ago

0 Amod Vaze over 5 years ago

TI__Mastermind 26830 points

Looks fine. Please add a feedforward cap parallel to R8. You can refer to https://www.ti.com/lit/an/slva466a/slva466a.pdf? to help pick a value.

Regards,

Amod

0 Llewellyn Dsa over 5 years ago in reply to Amod Vaze

Prodigy 120 points

Thanks Amod for the review there is also TPS562231 in the second page of the schematic, any suggestion and feedback for the same?

0 Amod Vaze over 5 years ago in reply to Llewellyn Dsa

TI__Mastermind 26830 points

I have notified my colleague to take a look at the schematic for TPS562231.

Regards,

Amod

0 Edwin Zang over 5 years ago

TI__Expert 6425 points

Hi Dsa,

TPS562231 schematic looks well. Please also add a feed-forward cap.

BRs,

Edwin.

0 Llewellyn Dsa over 5 years ago in reply to Amod Vaze

Prodigy 120 points

Hi Amod,

I have gone through the document, Is it mandatory to add the feed-forward cap parallel to R8? as stated document mentioned below,

Are there any negative consequences of not adding the same?

Regards,

Llewellyn

0 Amod Vaze over 5 years ago in reply to Llewellyn Dsa

TI__Mastermind 26830 points

Hi Llewellyn,

No it is not mandatory. But in certain high Vout cases, we have observed instability during light load so if you find any instability during your load transient or steady state ripple or bode plot measurements, then you can resize your feedback resistors (TPS62135 has internal Cff of 15pF already but pole/zero location changes based on the value of feedback resistors - check section 2 of app note) and/or add more feedforward cap.

Regards,

Amod

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TPS62135: Design Review