I am currently using a board with an LTC1760 to charge smart batteries. I'm having a problem with the buck fonctionnality. The schematic of my board is exactly the same as the schematic given on the datasheet (typycal application) :
Communication with smart batteries works. By visualizing the registers I see that by inserting a battery the system is ready to charge. The LTC1760 starts Buck operation but something goes wrong. If I visualize the voltage at the output of Rsens that's what I have :
Vin = 19V
It looks like the LTC1760 try every 250ms to restart buck. It force the QTG to stay open.....
If I look on the Vset pin the voltage is on the limit of the 0,8V reference voltage:
Any Idea ?
thank you in advance