My circuit use a LT8390 to convert 24V 10A supply to 12V 19A(max). It suffers from the following issue:
1. If a load > 0.5A is add the output goes into oscillation 12V to 11.2
2. PGOOD output seems to reset and power in a the sequence described in the data sheet as the "Hiccup Mode"
Please does anyone have any suggest as to why my circuit goes into this Hiccup mode as soon as a load is applied
Thanks for the reply. I have discovered the what was causing the fault. It was my power plane. I had designed large 12V rail plane but unfortunately I referenced it to ground. Hence 12V rail was only…
I would still follow the values suggested by LTPowerCAD just adjust the bandwidth to about 10th of the operating frequency.
Can you try modifying your compensation values? Current compensation values indicate < 45deg phase margin
Please use LTpowerCAD vII to get the compensation values for your application
Thanks for your reply. Please can you tell me why the "Load Step" feature setting does appear in the latest LTpowerCAD.
Please can you show me how you calculated the phase margin to be <45deg using the values from my schematic
Here were the settings I have used.
Please see if I have missed something on the schematic parameters