We have procured the evaluation board (DC2642A-A) from Mouser, India. Here is the link for the same - https://www.mouser.in/ProductDetail/Analog-Devices/DC2642A-A?qs=w%2Fv1CP2dgqrLcuMimBqFtA%3D%3D#mz-expanded-view-1308806147757
The ordered quantity was 1.
The evaluation board by default was soldered with 2 - 10F/2.7V Supercaps.
We are providing the 5V - 3A to the evaluation board. This done by AC to DC-24V-1.1A SMPS converter followed by DC to DC-5V-3A converter (using LM2596-ADJ step down voltage regulator).
We are monitoring Vin, Vsys and Vscap. We have also connected 10K pullup resistor to PFO pin and monitoring that too.
1) When 5V is provided, We get Vin - 5V, Vsys - 4.71V and Vscap - 400mV and the capacitors does not charges at all.
2) We then increase the input voltage to 5.2V. In this case, we get Vin - 5.2V, Vsys - 5.178V and Vscap voltages starts increasing indicating charging of the supercaps.
3) With no load connected at Vsys, it took around 5 minutes to charge the supercaps fully.
4) We then monitored the PFO pin on oscilloscope and found out that the pin is continuously providing pulse at periodic intervals.
5) We than verified the Vin on oscilloscope to see any dipping in supply causing PFO to trigger, but, there was no dipping on Vin.
So, want to figure out what is happening with the IC and the root cause of this behaviour.
