This link shows a typical schematic for using the LC3524. It is driving 2 mosfets which sounds as though it is the way you are using the IC. It shows the values of resistors attached to the gates.
https://www.afiata.com/1500w-ups-circuit/
This sounds way too low. Even if that were an averaged reading of alternating hi and low pulses, it's too low.
Does it show this without any load on it? If so then it could be broken.
You may need a new 3524 IC, unless you can devise a stage of voltage gain to add at pin 14.