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LM5022: 带载输出问题

Part Number: LM5022

使用LM5022做一个18-36转8V 2A的反激电路

目前空载下输出电压稳定的,但是一旦带载后输出电压就会掉到2V附近,想问下从哪几个方面去查找问题呢,变压器原边:辅助:副边为 1:2:1.5

变压器的功率能适应40W

原理图如下