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TPS2044的OC引脚

Other Parts Discussed in Thread: TPS2044

最近使用了TPS2044,使EN脚变高,使OUT关断,输出0V,此时OC引脚会输出一个低电平脉冲?此处把负载空载、或者用纯阻性负载,现象依旧。

  正常吗?

  • OC接的上拉电阻是多少,所接的Ref电压此时有波动么?

    其实EN拉高后MOSFET已经关断了,OC的判断不会再影响芯片的。

  • 我想随便咨询个问题,,我用的TPS2044,为什么我的输出端,短路以后TPS2044会烧了那

  • 见datasheet第十页: The OCx open-drain output is asserted (active low) when an overcurrent or overtemperature shutdown condition is encountered after a 10-ms deglitch timeout. The output remains asserted until the overcurrent orovertemperature condition is removed.

    过载过温都会导致OC输出低,过温的结果就是关闭switch和通过EN关Switch一样,理论上可以使得OC输出为低。所以如果你测试发现此时输出为低并不奇怪。

    事实上关于芯片的特性,只要您认准是TI的授权代理商处购买,其特性都不会错。