Hi, everyone! I am making a simple little speaker amplifier using a PAM8403 (https://www.amazon.com/gp/product/B00LODGV64/ref=ppx_yo_dt_b_asin_image_o04_s00?ie=UTF8&psc=1) and two 3-Watt, 8-Ohm speakers. This works great, and it amplifies the audio signal for the speakers perfectly fine.
My problem is that I want to run it off of a USB power bank. I tried with two power banks, but it always goes off after 30 seconds. My guess is that my project doesn't draw enough current to be recognized by the power bank. I tried adding a 100 Ohm resistor across the output of the powerbank to draw more current, but that didn't work. Does anyone have any suggestions on what to do? I am also very big on efficiency, so I would prefer a solution in which I wouldn't have to waste power, but if that is what it takes, i'll do it. Here is the brand new powerbank that I bought: https://www.amazon.com/gp/product/B081SPFH53/ref=ppx_yo_dt_b_asin_image_o00_s00?ie=UTF8&psc=1
I read that most power banks have an always-on feature so you can have it always on, but I have no clue about how I could active that. Thanks for your help.