Electronics > Beginners

Voltage dropping badly

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LukeB:
Hello,

I have been working on this battery charge, boost and protect circuit. I have had many various issues with it along the way and I have found another. I have everything working nearly properly however when I load the circuit with over 350ish milliamps the voltage drops below 5v. Why is this happening and how can I fix it. I was hoping to get up near 1 amp or at leas 700 800 milliamps.

https://easyeda.com/maxibrandon3/5v-boost-protect-and-charger

Hopefully the link works

madires:
Have you checked the battery voltage when the boost converter's output drops below 5V? What kind of inductor are you using?

LukeB:
The battery is practically full and the inductor is this https://lcsc.com/product-detail/Power-Inductors_22uH-20_C11037.html

madires:
What I've meant is the input of the boost converter to figure out if there's sufficient power. The inductor seems to be suitable but its datasheet is broken unfortunately. If you have a scope you could observe the switching while increasing the load.

Buriedcode:
What board are you using?  Switching power supplies can be sensitive to layout.  Was this a pre-built module or one you've designed yourself?

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