I am using the TPS92692 in buck-boost mode with an analog signal to set Iadj and PWM. When I start the circuit, it consistently goes into fault mode and the fault pin is periodically set low. However, after about 5 seconds, everything works fine and the fault pin is no longer set low but after some time, the current also gradually decreases.

The input voltage is 24V and the circuit powers 7 LEDs (with a forward voltage ranging from 2.8V to 3.4V for each LED). In this case, Iadj is set to 1.46V and the PWM is 2.44V

Here is the circuit :


[![enter image description here][1]][1]



Current start-up signal :

[![enter image description here][2]][2]

 

Fault pin start-up signal : 

[![enter image description here][3]][3]

Current after about 5s :



[![enter image description here][4]][4]


  [1]: https://i.sstatic.net/7J3aGneK.png
  [2]: https://i.sstatic.net/VwHz3fth.png
  [3]: https://i.sstatic.net/lGZSYqj9.png
  [4]: https://i.sstatic.net/JpLk1fj2.png