PMP20686: Upside-Down Buck Reference Design

Arpan Gupta57

Prodigy 40 points

Part Number: PMP20686
Other Parts Discussed in Thread: UCC28880

Hi TI team,

I am analysing the following circuit.

Could you please help me with some document where the working principle of the above architecture is explained?

Thanks & Regards,

Arpan Gupta

over 6 years ago

0 Ryan Manack over 6 years ago

TI__Intellectual 2610 points

Hello,

This circuit is essentially a negative input buck converter. Instead of traditional buck converter where the input ground and output ground are the same node, in this topology the positive input and positive output are the same node. I have attached one paper on this. You can also reference the UCC28880 datasheet page 18+ for more information.

Thanks,

RyanThe Parallel Universe of Negative Input Voltages.pdf

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PMP20686: Upside-Down Buck Reference Design