LTC3780+AD5174

Hi Alex 

Can you provide more details on the problem?

What is the output voltage when AD5174 is attached ?

Has AD5174 been tested standalone like the one done on LTC3780?

Has the recommended power-up sequence been followed?

regards,

mikee

Hi Mikee

The experiments revealed the following: if I set the output voltage with the AD5174 in advance,
and then turn on LTC3780, then everything works. I checked it like this: I was flashing MCU with 
different firmware (for different output voltage / AD5174 value) and then running the firmware. 
At the same time, the RUN pin LTC3780 was distorted and the output voltage corresponded to the 
calculated one. 
Colleagues changed the value of resistance AD5174 ​​"on the fly" without resetting the LTC and the 
output voltage does not change.

The output voltage does not change if I try to change the resistance value of the AD5174 with 
LTC3780 running.

When replacing the AD5174 with a mechanical potentiometer of the same rating, circuit works.

Hi Mikee

The experiments revealed the following: if I set the output voltage with the AD5174 in advance,
and then turn on LTC3780, then everything works. I checked it like this: I was flashing MCU with 
different firmware (for different output voltage / AD5174 value) and then running the firmware. 
At the same time, the RUN pin LTC3780 was distorted and the output voltage corresponded to the 
calculated one. 
Colleagues changed the value of resistance AD5174 ​​"on the fly" without resetting the LTC and the 
output voltage does not change.

The output voltage does not change if I try to change the resistance value of the AD5174 with 
LTC3780 running.

When replacing the AD5174 with a mechanical potentiometer of the same rating, circuit works.