TPS54618: boost back issue

Mingmo Zhu

Part Number: TPS54618

Dears,

If TPS54618 EVM VIN is floating, then TPS54618 VIN will occur 8V when apply 4V at VOUT.

Could you explain the boost back issue? And how can we prevent boost back?

thanks.

0 Dorian Brillet de Cande over 5 years ago

Hello,

This phenomenon is well explained in the below paper, topic 6: Prohibit the boost mode of step-down converters

If you have any other questions, please ask.

Thank you very much!

Regards,

Dorian

0 Mingmo Zhu over 5 years ago in reply to Dorian Brillet de Cande

Hello Dorian,

Thank you for your answer. I will read the paper and come back to you if any questions.

thanks.

0 Dorian Brillet de Cande over 5 years ago in reply to Mingmo Zhu

Hello,

Did you implement a viable solution to prevent it from happening such as disabling the part when applying 4V at VOUT if VIN is floating?

Do you have any further questions?

Thank you very much!

Regards,

Dorian

0 Mingmo Zhu over 5 years ago in reply to Dorian Brillet de Cande

Hello Dorian,

Since EN pin already connected to VIN, so we add a diode at the output to prevent reverse.

Thanks.

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