Other Parts Discussed in Thread: LM5176
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你好
1:我换了LM5176,在输入电压超过Vout电压时,还是会出现紊乱。
2:能否详细讲解下这个IC的工作方式,详细到各个MOS的开关和电感中的电流方向。因为我发现,在升压进入降压时,电感电流方向会反相或者180°相移。
3:请求比LM5175datasheet更详细的讲解。
4:请问还有谁成功的使用过LM5175或者LM5176。能否给个联系方式咨询下。因为这个IC周围器件很少,不需要调试太多。我觉得是否是IC本身有问题。
谢谢
Again, sorry for the delay owing to being out of office during the Thanksgiving holidays.
The SW1 should continue to switch in the buck mode. However, your waveform shows it intermittently stops switching.
There are a few possibilities to cause such abnormal switching behavior. Have you monitored SW2? And the input voltage and see if it fluctuates when such abnormal behavior occurs? Could you take a scope picture showing Vin, Vout, SW1 and SW2?
Best Regards,
Youhao Xi, System and Applications Engineering, APP-BMC-BCS, TI