Original question:
TPS92641: 关于芯片Vout引脚的问题
Part Number: TPS92641
TPS92641测试.pdf
能否帮我检查一下原理图设计是否有问题,为什么实物做出来之后,TPS92641工作不正常
空载时候,测试LED+端对GND的波形如下图
带载12A的时候波形如下图所示
希望能尽快获得你们的回复,谢谢!
您好
请您提供一下HG和LG以及S D RV的波形图。
由于先测试功能,暂时不启用外部MOS管调光,所以SDIM引脚被直接给3.3V的直流信号(信号发生器给出),根据手册说明可知,SDIM引脚为高电平的时候,SDRV引脚应该是一个反向的低电平
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1463316/tps92641-questions-about-roff-for-low-current-level?tisearch=e2e-sitesearch&keymatch=TPS92641#
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1461510/tps92641-please-help-me-analyze-that-there-are-glitches-in-the-lg-pins-of-the-pwm-output-thanks
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1502964/tps92641-tps92641-cause-of-overshoot-at-the-rising-edge-of-the-current-waveform?tisearch=e2e-sitesearch&keymatch=TPS92641#
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1474776/tps92641-tps92641?tisearch=e2e-sitesearch&keymatch=TPS92641#
请参考以上相关帖子说明。
另外上传的附件是PDF文件,我想知道原理图设计是否存在问题,能否帮我检查一下,谢谢!