data/text/DLP3/898482

TPS65150: Abnormally spike at voffset of TPS65150 without load

Part Number: TPS65150 Hi team, My customer is using our TPS65150 and see an unpredictable behavior since no load condition. Please refer the below waveform and schematic. We found that there is a SPIKE with a waveform of about 11.41V on VOFFSET as below figure. This SPIKE occurred when VREST reached -14V. Is there any work around or any suggestions to prevent it. Currently, this The waveform is measured without load. Thanks.

Hello, I have notified our expert regarding this topic. Please expect a response by 4/24/20. Thanks, Costin

Hello Feng, Can you please measure current on the VOFFSET supply to see if there is a big current step? I suggest to remove C9815 and disconnect U9805 circuits from VRESET to see if these circuits are causing a big current step on VOFFSET. A big current step on OFFSET is the likely cause of the this spike so you can try to debug it further from this point of view. Kind Regards, Liaqat