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Unwanted random restart of INN3168

Posted by: HareyRamPandey on Fri, 07/02/2021

Hi,

I am facing random unwanted restart of INN3168. It stays off for 1.5S and comes back. How can I trace the reason for restart? The BPP pin was captured and found constant. Its a less than 50W flyback converter with 200V DC and multiple outputs. Out of multiple ways, i need to know the exact reason for restart so that can be fixed. Please help.

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Submitted by PI-Bolt on Tue, 07/06/2021

Hi,

 

  1. Have you measured the current supplied to the BPP bypass capacitor from the primary bias winding?  The current provided should not exceed the overcurrent threshold current that would set the INN3168 into auto restart.
  2. What operation conditions trigger this restart event?  Is it when increasing the input line voltage or?

Regards,

Bolt