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TPS565208: TPS565208 start up question

Red Yen
Expert 4360 points
Part Number: TPS565208

Hi Support team 

pls refer following for TPS565208 application schematic 

we suffered the start up issue both in max load no load conditions 

in max load VOUT will have negative voltage 

in no load VOUT will delay around 10mS after VIN established 

the similar waveform also occurred in EVM   

need your kindly help to check how to overcome it 

thanks a lot 

max load start up 

CH1 VIN

CH2 VOUT

NO load start up 

CH1 VIN

CH2 VOUT

  • 0
    TI__Expert 4795 points

    Hi Red,

    For max load, I check 1V output condition, the waveform is normal as below. Could you help check whethter 1V is normal from you side?


    For light load, Vout begin to ramp up until EN is high. As you use 54.9k/10k resistors, there is some delay between VIN and Vout ramp up.