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单桥电源如何实现自启动

Other Parts Discussed in Thread: UC3842, UC2525B

最近设计一个辅助电源,由于输入电压高,采用反激电源安规压力大,管子也不好选,因此打算采用半桥结构,选了uc2525b做控制器,使用电阻自举启动,类似uc3842的结构,但是uc2525b不启动,达到启动电压后电压马上掉下来。有什么办法让uc2525b实现类似uc3842的自启动吗?