TPS65131: Negative out is not stable

Sankar Karuppannan

Part Number: TPS65131

Tool/software:

Hi,

I am using TPS65131RGER for +/-12V in my design. When I connect the load negative voltage to going to -18V. without load I am getting proper output.

I have attached the schematic.

Thanks,

Sankar.K

8 months ago

0 Patrick Yao 8 months ago

TI__Mastermind 30990 points

Hi Sankar,

Could you please re-upload the schematic with higher resolution? Thanks

Patrick

0 Sankar Karuppannan 8 months ago in reply to Patrick Yao

Prodigy 200 points

MBC_CHIP_Board.pdf

0 Patrick Yao 8 months ago in reply to Sankar Karuppannan

TI__Mastermind 30990 points

Hi Sankar,

May I know what is the load on -12V rail? And do you have any waveforms could share as well?

BTW, the Q1 is recommended to place the source node towards the input. Or the body diode will still provide path from input to output no matter Q1 is on and off.

Patrick

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TPS65131: Negative out is not stable