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pebri86 / esplay_micro_hardware

Micro version of esplay hardware, ESP32 based gaming console
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slow battery charging #3

Closed pizvizdik closed 4 years ago

pizvizdik commented 4 years ago

hello pebri,

every battery i tried is charging only at 50mA rate which is pretty slow i think (about 20 hours of charging time with 1000mAh battery).. i also tried different usb power supplies and micro USB cables.. is it caused by scheme design or there is possible problem?

thank you

pebri86 commented 4 years ago

Hi, Please check value of R27 it should be 1.65k to deliver 600mA charge rate. If you use battery with big capacity like 1000mAH replace those resistor with 1K value to speedup charging.

pizvizdik commented 4 years ago

hi, i just checked R27, resistance seems to be OK (about 1.66K).. still no higher current than 50mA.. do you have any other ideas please?

pebri86 commented 4 years ago

hi, i just checked R27, resistance seems to be OK (about 1.66K).. still no higher current than 50mA.. do you have any other ideas please?

Try changing those Resistor with 1K value

pizvizdik commented 4 years ago

thank you very much pebri ^^ i just soldered 1K resistor and charge rate goes up to about 100mA :3 not sure how to calculate R27 resistance for at least 800mA?

pebri86 commented 4 years ago

Ah, i think you have another variant of LTC4054 ic. I originally designed with LTC4054-4.2 which the datasheet said the charge current 1000 times the current out the PROG pin and the formula is

Rprog = 1000 / Ichrg

I think you have LTC4054L variant which unfortunately only could out max 150mA based on the datasheet. If you want higher charge rate you need to replace the IC with LTC4054-4.2 variant which current output up to 800mA.

Note: Please determine which variant the IC you have then find the right datasheet for it.

pizvizdik commented 4 years ago

finaly had time to swap that little guy, now everything is working just fine :3 thank you very much for your help :)