/diy/ - Do It Yourself

>>1834603
>Changing the timing capacitor won't make a shred of difference to the output voltage, it will just change the frequency at which it switches. You'd need to change the voltage feedback or voltage reference side of the circuit. Read the relevant datasheet/appnote for the relevant IC.

I read the datasheet for the IC on my powerbank. Turns out all of the buck/boost circuitry is internal so I can't modify jack fuck anyway.
There might be an alternative, though. The actual lithium cell inside of it is a nominal 3.7 volt battery, which is exactly what I need. Would I be able to tap the battery directly at the + terminal, power my circuit with it, return it to the powerbank's ground, and still have the IC deal with under/overvoltage and overcurrent protection?
Something tells me it doesn't quite work like that.

>>1834603
Changing the timing capacitor won't make a shred of difference to the output voltage, it will just change the frequency at which it switches. You'd need to change the voltage feedback or voltage reference side of the circuit. Read the relevant datasheet/appnote for the relevant IC.

I read the datasheet for the IC on my powerbank. Turns out all of the buck/boost circuitry is internal so I can't modify jack fuck anyway.
There might be an alternative, though. The actual lithium cell inside of it is a nominal 3.7 volt battery, which is exactly what I need. Would I be able to tap the battery directly at the + terminal, power my circuit with it, return it to the powerbank's ground, and still have the IC deal with under/overvoltage and overcurrent protection?
Something tells me it doesn't quite work like that.