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TPS61158: Vout when CTRL is low

Prodigy 30 points

Replies: 2

Views: 56

Part Number: TPS61158

Hi, 

I have VIN at 5V and CTRL at 0V but see 4.4V at Vout.  I was expecting 0V at Vout.  Does this make sense?  When CTRL is high (3.3V) I see ~18V at Vout which is appropriate for our application.  

Thanks,

Chris

  • Hi Chris,
    That normal phenomenon, because before you apply the signal to CTRL pin, the output voltage equals to Vin-VD(diode forward voltage), when you give the PWM signal to CTRL pin, boost start switching,and the output voltage increase to desired voltage.
    Regards
    Sean
  • Hi Chris,
    Could you please help me click "Resolve" button, thanks a lot.
    Regards
    Sean

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