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用的LM1084，根据芯片资料，R1选用121欧姆，R2选择1070欧姆，将输入的28V转换为12V左右。芯片后端负载为12V，0.13A。为什么加上前端的LM1084用数字电源供28V时电流还是0.13A？不应该是前后功率相同么，电压越高，电流越小么？是因为不是隔离电源么？
LM1084是LDO，LDO输入电流等于输出电流。
