Hi,
I recently posted question forum about behavior of following schematic, I changed PCB footprint, but issue persisted (low voltage on output and high consumption on empty load).
Input voltage was 2.4V, output voltage was 1.2V. Consumption was around 220mA. When I raised input voltage to 2.8V, consumption came to 460mA a I noticed, that capacitor C3 is getting overheated.
I assumed that somehow C3 is causing short, do I de-solder it from PCB. After testing again with input voltage 2.4V I got 5V on output (as expected) with negligible consumption. When I hookup Arduino board as
load, consumption went to 50mA, as expected for such board. After testing output on oscilloscope I noticed, that obviously there filtration is missing (voltage oscillate 10%). When I calculated C3 I got
value 160uF and supply tantalum capacitor 220uF, 6.3V, tolerance +/- 20%, ESR 35mOhm. I assume, I need, but am I right regarding parameters? Thank you for your help