https://community.nxp.com/t5/Power-Management/PPF7100%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E6%96%AD%E6%8C%AF%E9%93%83%E9%97%AE%E9%A2%98/m-p/1869319#M3506 <DIV class="">&nbsp;</DIV><P>这是我们测试的照片，地线不是很长。</P><P>&nbsp;</P> Tue, 21 May 2024 03:45:59 GMT tristan001 2024-05-21T03:45:59Z https://community.nxp.com/t5/Power-Management/PPF7100%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E6%96%AD%E6%8C%AF%E9%93%83%E9%97%AE%E9%A2%98/m-p/1869242#M3504 <DIV>硬件原理图完全按照手册参考设计。</DIV><DIV>在<SPAN>输入5V条件下，</SPAN>开关节点波形测试过程中发现如下问题：</DIV><DIV>1、7100BUCK输出<SPAN>开关节点</SPAN>上升沿振铃（最大7.5V）大于芯片SW针脚最大耐压值6V，但持续时间较短（小于5ns）；</DIV><DIV><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="tristan001_0-1716257137998.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/279725iCBD0B7FA812AEDA9/image-size/medium?v=v2&amp;px=400" role="button" title="tristan001_0-1716257137998.png" alt="tristan001_0-1716257137998.png" /></span><P>&nbsp;</P></DIV><DIV>2、<SPAN>7100、5200BUCK输出开关节点下降沿振铃（-0.9~-0.6V）小于芯片SW针脚最小耐压值-0.3V，持续时间也较短（小于10ns）；</SPAN></DIV><DIV><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="tristan001_1-1716257138004.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/279727i4FB0EF4A9F36332D/image-size/medium?v=v2&amp;px=400" role="button" title="tristan001_1-1716257138004.png" alt="tristan001_1-1716257138004.png" /></span><P>&nbsp;</P></DIV><DIV><SPAN>3、7100、5200</SPAN>BUCK输出开关节点在上升沿之前有<SPAN>-0.9~-0.6V的电压凹陷，小于芯片SW针脚最小耐压值-0.3V，持续时间也较短（小于10ns）；</SPAN></DIV><DIV><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="tristan001_2-1716257138008.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/279726i496F4D7900764BBF/image-size/medium?v=v2&amp;px=400" role="button" title="tristan001_2-1716257138008.png" alt="tristan001_2-1716257138008.png" /></span><P>&nbsp;</P></DIV><DIV><SPAN>以上三种情况是否会损坏芯片，应如何改善？</SPAN></DIV> Tue, 21 May 2024 02:06:42 GMT https://community.nxp.com/t5/Power-Management/PPF7100%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E6%96%AD%E6%8C%AF%E9%93%83%E9%97%AE%E9%A2%98/m-p/1869242#M3504 tristan001 2024-05-21T02:06:42Z https://community.nxp.com/t5/Power-Management/PPF7100%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E6%96%AD%E6%8C%AF%E9%93%83%E9%97%AE%E9%A2%98/m-p/1869257#M3505 <P>你是怎么测试的，示波器的地线很长吗如果不做特殊的处理测试出来的信号可能不是真实的？往往测试出来的作为参考跟实际的波形还是有区别的</P> Tue, 21 May 2024 02:31:52 GMT https://community.nxp.com/t5/Power-Management/PPF7100%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E6%96%AD%E6%8C%AF%E9%93%83%E9%97%AE%E9%A2%98/m-p/1869257#M3505 guoweisun 2024-05-21T02:31:52Z https://community.nxp.com/t5/Power-Management/PPF7100%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E6%96%AD%E6%8C%AF%E9%93%83%E9%97%AE%E9%A2%98/m-p/1869319#M3506 <DIV class="">&nbsp;</DIV><P>这是我们测试的照片，地线不是很长。</P><P>&nbsp;</P> Tue, 21 May 2024 03:45:59 GMT https://community.nxp.com/t5/Power-Management/PPF7100%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E6%96%AD%E6%8C%AF%E9%93%83%E9%97%AE%E9%A2%98/m-p/1869319#M3506 tristan001 2024-05-21T03:45:59Z https://community.nxp.com/t5/Power-Management/PPF7100%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E6%96%AD%E6%8C%AF%E9%93%83%E9%97%AE%E9%A2%98/m-p/1869321#M3507 <P>补充图片，因图片上传失败，改为压缩文件</P> Tue, 21 May 2024 03:48:01 GMT https://community.nxp.com/t5/Power-Management/PPF7100%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E6%96%AD%E6%8C%AF%E9%93%83%E9%97%AE%E9%A2%98/m-p/1869321#M3507 tristan001 2024-05-21T03:48:01Z https://community.nxp.com/t5/Power-Management/PPF7100%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E6%96%AD%E6%8C%AF%E9%93%83%E9%97%AE%E9%A2%98/m-p/1869333#M3508 <P>地线越短越好不用缠绕这么多圈。</P> <P>如果要更改也只能更改PCB的走线短一点粗一点在SWITCH的节点那一块区域</P> Tue, 21 May 2024 04:17:02 GMT https://community.nxp.com/t5/Power-Management/PPF7100%E5%90%AF%E5%8A%A8%E5%92%8C%E5%85%B3%E6%96%AD%E6%8C%AF%E9%93%83%E9%97%AE%E9%A2%98/m-p/1869333#M3508 guoweisun 2024-05-21T04:17:02Z