Other Parts Discussed in Thread: TPS61201,
Hello,
i have a question regarding simultaneous charging and discharging.
we are using the BQ25595 to charge a 100mAh (3.7V) LiPo Battery with 5C charge / discharge rating.
The input power source is a generator coil with a resistance of 56Ohm. (Picture 1 shows the input voltage without load and with 100Ohm load).
The Input voltage can go up to 12Vpp. For this reason we use a 3.3V LDO to limit the input voltage.
But even without this LDO (Vin <3.6V), the behavior below shows up.
For powering our device (Low Power MCU with 350 µA current consumption) we use a TPS61201 to generate 3.3V.
Now we observed a behaviour I don't understand:
The BQ25505 seems to charge the battery very slow if there is no load attatched to the VSTOR.
When i enable the TPS61201 (which works and generates the 3.3V) the BQ25505 stops charging the LiPo battery even without any load on the TPS6201.
Now when i add a a resistive load of 10k Ohm to the TPS61201 (330µA) the battery voltage is decreasing even if the generator coil generates energy.
I tried the same with a DC power supply and had the same result.
Did I oversee something or can the IC not charge and discharge at the same time?
Attached you will find the relevant section of the circuit diagram.
best regards
Thorsten
