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UCC28C42的TINA仿真问题

Other Parts Discussed in Thread: UCC28C43

我将TI的tina测试例程修改了一下,现在给定VDD 12v的情况下, VREF没有电压. 而我实测这颗芯片在给了VDD 12V之后VREF会有5V左右的电压. 现在不知道问题出在哪里.我的测试文件:

my_test_ucc28c43.TSC