Eda003 , 09-25-2025, 07:48 PM
Hey guys, I’m having trouble powering an LED from a power bank – I have a PCB with USB-C where I need to power a 5 V / 15 mA LED using a power bank. The problem is that most power banks switch off below about 60 mA. How can I solve this?I tried designing a 555 circuit with a resistor that occasionally raises the current to about 150 mA, but the problem is that the LED also blinks with the current spike, which is undesirable.The 5 V is negotiated by pulling the CC pins with 5.1 kΩ resistors.Is it possible to build a power delivery circuit purely from discrete components, without programming, so I can reliably power my 5 V / 15 mA LED from a power bank?