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UCC24624工作问题

Other Parts Discussed in Thread: UCC24624

LLC谐振变换器中UCC24624作为副边同步整理控制,UCC24624的VDD接LLC的输出电压,开环测试电压慢慢加到200V,此时输出电压为12V,但是UCC24624的VDD在升压的过程中维持在4.35V左右,REG输出也是4.3V左右,不清楚具体什么原因,按照datasheet描述,REG的输出电压应该是随着LLC输出电压在变化,直到超过11V时候内部LDO正常工作!副边同步整理电路如下图所示。