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TLV62569: 技术咨询

Part Number: TLV62569


你好,

     我们目前在使用Buck TLV62569时遇到如下问题:

     在buck芯片输入电压5V缓慢下跌的过程中,mos管Q2直接关闭,就是波形的4号通道(粉色波形)。mos管Q2关闭,导致与FB连接的阻值发生变化,然后buck芯片的输出就超调了好多,由原来的1.3V变成了2.1V(黄色波形)。Buck输出的电压时直接给NXP ARM7 MCIMX6Y2CVM08AB内核供电(1V/1.3V/1.5V)。请问一下,这是什么原因导致的呢?