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UC2846半桥电路恒压输出驱动问题

Other Parts Discussed in Thread: UC2846

输入129Vac,未进入恒压状态时的驱动波形

调高输入电压186.7Vac,恒压输出28.26V时的驱动波形

有此可见,芯片通过调频模式恒压的,怎么不是通过减小占空比调压?