Category: Hardware
Product Number: LTC4120
I'm testing wireless charging with the LTC4120 receiver and the LTC4125 transmitter. The charging current should be 400 mA. This works well, but as soon as the battery is almost full, the charging current starts to drop. When the current drops to 120 mA, the power transfer stops, and the transmitter goes into search mode. After a while, the transmitter finds the receiver, and so on. The problem is that the battery isn't fully charged, only about 85%. Presence detection on the DHC output using a BJT transistor and a 15V Z-diode is active