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UCC256402: OTP

Seyedhamed Hosseinifadaki
Prodigy 20 points
Part Number: UCC256402
Other Parts Discussed in Thread: UCC28180,

Tool/software:

Hi,

I have a question regarding an AC/DC power supply. We're using UCC28180 for the PFC section and UCC256402 for the LLC section. During thermal testing under overload conditions, the OTP is triggered, which controls the BLK pin via an optocoupler. After several OTP activations, the device restarts after 1 second, but after the fifth time, it shuts down and takes 180 seconds to restart automatically. This delay happens regardless of load reduction.

I also disconnected the device from the power supply, but the 180-second delay did not decrease.What could be causing this issue?

best regards