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TPS61175的问题

Other Parts Discussed in Thread: TPS61175

我想用TPS61175做一个升压转换模块,从3.7V升到28V,但是遇到的问题是空载时,能达到28V,但是加上负载后,输出电压只有15V了。其中,输入的电流有3.2A左右,并且工作一段时间后,电感发生啸叫,将开关频率由2.2M降为500K之后,电感不再啸叫。望大神帮助解决