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TPS62870-Q1: cann't output current more than 0.5A

Part Number: TPS62870-Q1
Other Parts Discussed in Thread: TPS62870,

Dear Sir/Madam:

          Now I use TPS62870  in my application ,  my design  current  is 2A~6A ,  but  realy it noly can output 0.5A , when the current  exceeds  0.6A , the output volotage is drop a lot . and  I can  hear " ci ci .." the sound the inductor makes . the schematic is as below:(figure 1)

      

       later   i modfed some parameters as figure 2 , but same result.

       what is the reason for this?

   BG!

  • Hi,

    Is there external supply attached to TPS62870-Q1 ? or is it coming from other pre regulator ? It seems you might have input current limit.

    You can give external supply with higher input current setting.

    I will check schematic and get back to you. 

    Thanks,

    Tanvee

  • Hi,

    Schematic and Simulation has different compensation setting. Schematic on left hand side doesn't look quite stable.

    Can you confirm the values?

    Thanks,

    Tanvee