TPS65133: Only Negative Supply Operation

Part Number: TPS65133

Hello,

Due to restrictions in board space we cannot place the positive output components (inductor and capacitor) and only need the -5V output. At the moment we do not see any activity (switching) at the inductor nor any voltage at -5V. Please advise.

Following is our circuit:

over 5 years ago

0 Aaron Goodson over 5 years ago

TI__Expert 6330 points

Hi,

I have notified our expert regarding this topic. Please expect a response by 2/12/19.

Thanks,
Aaron

0 SM over 5 years ago in reply to Aaron Goodson

Expert 1730 points

Hello Aaron, Thank you for arranging the help. May I ask if you could please expedite the matter because our customer will be coming for a demo on Monday.

0 Liaqat Khan over 5 years ago

TI__Mastermind 18550 points

Hello,

Design of this device requires VPOS boost inductor and output capacitor to work properly even if you only use the negative supply. You are seeing expected behavior of the device when these components are not installed.

Kind Regards,

Liaqat

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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TPS65133: Only Negative Supply Operation