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UCD9222+UCD7242上电时序问题

Other Parts Discussed in Thread: UCD9222, UCD7242

问题1:

我用UCD9222+UCD7242产生DSP6678的两路core电源,现在发现当UCD9222使能很长一段时间(约50ms)后,UCD7242的VGG才缓慢上升到4.75V以上,这种情况下,UCD9222就不能正常工作。目前我的推测是,UCD9222使能后去操作UCD7242,但是UCD7242还未达到正常工作状态,UCD9222检测到UCD7242的反馈异常,于是UCD9222进入到了一个错误状态。请问TI官方能给出明确答复吗? 是否这样的组合对两个片子上电的时序、UCD9222使能的时间有要求?这个时间间隔又是多收呢?

问题具体描述见附件

问题2:

Fusion Digital Power Design设置中,有一个VIN Scale的参数,请问这个参数是否为:VIN Scale = VINMON / VIN

问题可恢复至我的邮箱:yibinlk@126.com

感谢!

UCD9222问题描述.docx