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TPS63070: TPS63070 device behavior with load current setup up

Part Number: TPS63070

Hi,

i'm trying this out on EVM & when i power up the TPS63070 directly with DC source 4.8V and output load current set to 1.1A, the output voltage only give 3.06V. Then when I set the load current to 0A and voltage would rise back to 5V. At this point, I step up the load to 1.1A, the output voltage maintain at 5V. This happen only when DC electronic set to constant current(CC) mode. No problem when DC electronic load set to constant resistance(CR) mode. May i know if this is normal or should i not operate the device this way?

 BTW settings done on the device as follows:

VSEL set to HIGH

PS/SYNC set to HIGH

Regards,

Leo