Tool/software:
Hey, i use the part mentioned (tps2553) as a switch to power external cards i would want to connect to my card (my card can supply external cards if needed and the switch will enable it)
I use a dc/dc converter to 5 volts and goes through the switch to the outside. I want to power around 2W, but a little less is also okay.
The converter has internal current limiter that i set to 2.5A, and i put around 150uF of output capacitor.
In the input of the switch i added 1uF close between the in and gnd.
Enables comes from a gpio.
On the output i put 1uF only.
The current limit of the switch was set at first to 1.567A.
I turn on the switch and everything works as expected. But
When i try to load (using chroma) in CR mode to get the current limit area, i get a lot of oscillating in the input and output current and voltage of the switch.
I tried increasing the output capacitor to 47uF and it reduced the oscillating, but when i decrease the load and increase the inrush current, it returns oscillating and i need to add extra capacitance to the output again.
I tried reducing the current limitations to 1A because i saw the continuous output current i maximum 1.5v recommended.
But the situation repeates still.
I would like an explanation on how the current limiter of this switch works (does it tests the change in the current?) and what can be the cause of this oscillating in the current?
I also tried it with power loads and it stills occurs.
Also how much do i need to increase the capacitance if its really the solution and not just a bandage (because i guess the external card i would connect it to will have input capacitance also)
