Hello:
I now need a circuit for dual power switching with the following requirements:
1 The first connected segment of power supply has priority (regardless of which port)
2 Need to be able to set the power switching threshold voltage
3 When the voltage of the power supply terminal is lower than the switching threshold voltage, the power supply is automatically switched to the other terminal, and the switching time is not longer than 20us
4 Need to be able to manually switch the power supply port through external MCU control.
5 The normal power supply voltage is 12~17V, and the steady state current is not more than 0.5A
6 Support hot swap, or you can add external hot swap management circuit
7 with power status output
Now I have made a test board with TPS2121, and I haven't finished the test. Now I find that when the power supply port is controlled by the external CP2 pin to be IN2, when the power supply of IN2 is unplugged, Vout will drop to a very low voltage, which will cause the post-stage system Power-down reset.
Excuse me:
1 Is there a plan for my request?
2 Is this problem with TPS2121 a common problem? Is there a way to solve it?
thanks