Other Parts Discussed in Thread: SM74611
HI ,
I am using BQ25570 and below is the configuration?
1. Solar Panel (5V, 2.6W) to BQ25570
2.a) BQ25570 to 4 Cell parallel x 18650 Battery
b) BQ25570 to SM74611 to Load.
The problem I’m found is the battery voltage drops very quickly (voltage value ~ 0-1V) and the resistance from VBAT pin to GND is ~ 40 Ohm. 2/4 devices encountering this case is in storage state (not yet put into actual operation), so Solar charger feature not yet active.
- The power of Solar Panel is larger than the input power allowed of BQ25570, but 2/4 devices are in storage state and I had a small test is using Solar Panels 9V & 12V for the input of BQ25570, the result is BQ25570 still works normally
- Quality of Battery is not good ( internal resistance of Battery is of large value) so it affecting to IC operation
- Activity characteristic of the Diode cause this case
Possible to give some advise, if you need schematic, that i can share to you.