Tool/software:
Hello, experts.
We drive the load(relay) with TPS1HC30-Q1 as HSD. KL30C is sampled by pull down resister network of 25.6K.
In below situation, Load removed, KL30C=0V(supply of KL30C). Fault pin is pulled up to VCC which equals to 5V with Rp=10K
Then we measured the voltage of VBB is 0.6V at room temperature and 0.8V at 85 degree.
If we remove the Rp, the voltage of VBB decreased to 0V.
It seems that the current flow from fault pin to VBB pin through IC internal.
And the voltage of Fault pin is more less than 5V when KL30C=0V.
Question:
1.Is the above phenomenon normal?
2.Shall we increase the Rp resister to decrease the leakage current through IC internal? What is the largest Rp resister the fault pin can work normally with?
3.Is there other methods to avoid the float voltage on VBB pin excluding point 2?
