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OPA454发烫

Other Parts Discussed in Thread: OPA454

问题描述:使用OPA454芯片,上电后板子的功能都可以实现,就是OPA454发烫的厉害。芯片供电正负50V,E/D COM引脚接地,E/D (Enable/Disable)接的30pF电容到地以及悬空都试过,画封装的时候芯片的Powerpad 没考虑,所以Powerpad未连接。

请问如何解决这一问题,是原理的问题还是Powerpad的问题或者其他原因呢?



  • 您好,
    感谢您对TI产品的关注!
    应该是Powerpad的问题,在数据手册12.1.2 PowerPAD Layout Guidelines章节,对Powerpad有要求:
    Soldering the PowerPAD to the PCB is always required, even with applications that have low power dissipation(始终需要将PowerPAD焊接到PCB,即使是低功耗的应用也是如此)
    将Powerpad焊接到封装下方的铜皮区,通过在这个铜区域内使用热路径,热量可以从封装件传导到接地层或其他散热装置中