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TPS61041到底是恒压还是恒流芯片?

Other Parts Discussed in Thread: TPS61041, LM5175

我在一个储能项目中用了TPS61041, 输出设为18V,输出电容接25V4400uF, 负载用一个NMOS控制开通。负载是个电磁阀,现在有个问题,正常情况下我一直开通负载,输入电流在250mA左右。但有些产品的输入电流只有100ma不到,换ic就又好了。请教TI工程师,TPS61041什么情况下会损坏,输出要接稳压二极管限压保护码?