TPS40055: Not Start up when Power On

Hello Louis,

Could you increase value of Rlim to ensure device is not hitting current limit?

What is capacitance value of C18?

Hi  Marshall

C18 value  is 100nF.

Best regards.

Hello Louis,

I understand. I was asking to increase OCP function for debugging purproses.

One reason for devices failure to start is often because of heavy capacitive load.

If device hits current limit at startup, it will fail to start up.

Are you starting up into heavy load? (what ohms? what current?) If you are, can you please disconnect for debugging purposes.

What is the amount of capacitance on the output...hard to tell for me on supplied schematic?

Thank you

Hi Marshall

It works when I increase the function of OCP.

Even if there is no load like the above waveform, it does not work.

ouput capacitor is 220uF.

Is there only a way to increase OCP for startup?

Best regards