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UCC28950: Tina simulation turn off component with 24V output after 6ms

Part Number: UCC28950

Hello, I simulated UCC28950 in TINA based in the sample of this component, but changing some componentes to duplicate output voltage, L1=33u, T2=12:1, R6=20K. The simulation start well and goes to 24V but after 6ms it turn off and I don't know why. Could anyebody help me to know why? Thanks