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UCC25630-1EVM-291: UCC25630-1EVM Test .

Part Number: UCC25630-1EVM-291
Other Parts Discussed in Thread: UCC256301

input is turned off, the voltage on the large electrolytic capacitor will begin to drop, and at this time the power supply will continue to work until the big electrolysis. When the voltage on the capacitor falls to about 200V, the chip stops working, because the voltage on the large electrolytic capacitor is only 200V, which leads to the difference between the resonant parameters and the normal working parameters, and may enter the ZCS region. in order to avoid this phenomenon, some chips can be dealt with by the minimum frequency limit, but UCC256301 does not see this function and does not know how to deal with this problem.

  • Hi,

    If your application requires shutting down with heavy load on the output, I would recommend using one of the other UCC25630x versions which have tighter hysteresis on the BLK stop and start thresholds.The tighter hysteresis will allow the LLC to shut off at a higher input voltage.

    Best Regards,

    Ben Lough