I am working on a 300W module design using the LT3752 with an input voltage range of 16-40V, but at 16V, it draws an excessively high current of about 1A from the input when idle, causing my transformer, output coil, LT3752, and LT8311 to overheat. Additionally, when I load it, it goes into protection mode. However, at an input voltage of 28V, it initially draws 0.1A from the input in no-load condition, and neither of my two controllers generates a gate signal. When I turn the input voltage off and on, it draws 0.3A in no-load condition, which means both controllers are working and gate signals are being generated. And I can load the module as I want. On the synchronous side, when I remove the gate resistors at 16V and put the synchronous rectification into passive mode, my no-load current stabilizes. Is this because it enters cross-conduction at 16V, or is there another reason? I would really appreciate your help. What kind of solutions can I come up with?
