Category: Hardware
Product Number: LTC4120
Hi,
I have designed a wireless charger using the LTC4120 and LTC4125, with the schematics based on DC2330 and DC2445. 
Both designs have the same issue with the DHC pin.
According to the datasheet, the DHC pin is used to control the transmit power, and the DHC pin is the output of a "comparator" between the input and the internal reference voltage.
The problem is that the DHC pin output voltage can reach more than 30VDC, while the rating of capacitor C11 is only 6.3V. and as we know if DHC pin fail, it make Rx board will be heat up
Could you please explain more about the DHC pin, "presence detection circuit", and how to prevent dhc pin issue?
thanks
Mustafidz