Electronics > Beginners

Need cheap USB power bank with "always on" instead of "auto off"

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elektrolitr:
I've made a quick check of charging current cutoff



The chip is working good. The cutout was at 100mA which is 1/10 of programmed charging current just like in datasheet.

The only downside of these small modules is that all of them are programmed to 1A charging current which can be on the high side for small batteries and you have to change a resistor (usually of 0805 size) to bring the current down.

kjr18:

--- Quote from: elektrolitr on January 28, 2020, 05:53:51 pm ---
--- Quote from: kjr18 on January 28, 2020, 01:39:24 pm ---This TP4056 module is probably based on MT3608 boost IC or something like that. Those chips have enable pin, but they are hardwired to enable position. With this one is one possibility of overcharging.

--- End quote ---

Nope
TP4056 is a chip made specifically for Li charging. It should have all bells and whistles needed including the current cutout at the end of charge. See the attached picture.

I can check the behavior of the module a bit later, though.

--- End quote ---

But of course, I know that. But you showed a module with boost added, not only TP4056 but also chip with marking B6288, which is MT3608 by Aerosemi. Try measuring cut-out while drawing larger current from boost converter.

elektrolitr:
Thanks, I probably got the point.

Load current still goes through the 4056 and prevents it from cutting down the charging current, right?

I checked and it really doesn't cut out if there is a load connected.

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