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UCC25600启动无PWM输出

Other Parts Discussed in Thread: UCC25600

我在用UCC25600学习LLC设计,外围电路如下图所示。功率部分电路不上电,仅仅外部供电给UCC25600调试。给芯片上13V电压,,VCC有13V,SS引脚有软起的波形,稳定在6V,但是GD1和GD2均无PWM输出,均是低电平。测试其他引脚,发现DT引脚有2.25V,RT脚有2.49V,OC脚为0V(外部接地)。此时没有触发OC的保护,不知道以其哪里有问题。附上启动波形。

CH1:SS波形;CH4:GD1波形。请教各位前辈了!