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数据手册上Pin4：Cbp推荐值是470pF，为何你的原理图上是10nF，你把无输出的LDO这个电容取下来或者更换为470pF可能就好了，你可以尝试下8 w" [# S* ]/ }! `7 J* g* e
) @. M, V/ Z- `8 @External Capacitors
8 v3 M0 k3 d1 v8 k4 p( ?The LM8805 can stable work with cheap MLCC output Capacitor.
" P! H4 s1 L7 _3 zThe LM8805 having high ripple rejection ratios, the series can be used with power supply noise. A 470pF
8 u9 N) c% S7 U* M' S! Jcapacitor from the Bypass input to ground reduces noise present on the internal reference, which in turn b# V$ u G+ o8 |3 n* D
significantly reduces output noise. If output noise is not a concern, this input may be left unconnected. Larger
( [$ t3 X3 }. `7 q: i. rcapacitor values Cbp be used, but results in a longer time period to rated output voltage when power is initially
/ @: h; t( H" v+ Y% B7 ]0 U. x( rapplied.
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楼主
发表于 2019-10-15 09:40
