原理图如上,外围电路什么都没接的情况下给ref供2.5v电压,电流20ma以上,2.5v和5v同时供的情况下,工作一会以后2.5v工作电流会跳变
user5992955:
器件为INA303A1pwr
user5992955:
器件为INA303A1pwr
Kailyn Chen:
参考电流如何跳变的? 2.5V电压降低了是吗?
user5992955:
回复 Kailyn Chen:
如果通过基准供电,电压会被拉低。视频是通过稳压电源供电
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user5992955:
回复 user5992955:
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user5992955:
回复 user5992955:
而且有时候很奇怪,只有一路的时候刚开始还是正常的,当接上两路或者三路的时候电流跳变更快
Kailyn Chen:
回复 user5992955:
电压被拉低,应该是电路哪里耗电,导致电压被拉低。没有输入,那么静态电流正常吗,会不会比datasheet中的值高?
或者您把输出端的容性负载C38去掉试试呢? 我担心是由于layout中的寄生电感和电容组成了LC 滤波电路,导致功耗增加。
user5992955:
回复 Kailyn Chen:
目前是只有焊接ina303和主芯片,其他都是空着。单单对ina303供5v主电源,5v电流是正常的。如果把2.5v基准也供进去,2.5v基准电流就出现异常。5v主供电没给的情况下,只给2.5v基准,2.5v电源的电流也会异常。
目前等待官方评估版到货后再验证下