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UCC2804: UCC2804

Part Number: UCC2804

Hello,
I'am using the Ucc2804 pwm controller for a dcm flyback converter ( Fsw = 300kHz). The overcurrent protection ( Hiccup mode) does not work during an output shortcircuit. The PWM works in cycle-by-cycle current limiting mode ( high power dissipation). where is the issue? (the leakage transformer is low)
This pwm controller used in a CCM flyback converter allows the Hiccup mode.
Thanks
Stéphane