I am using ADA4077 opamp in my SMPS design for Feedback for current control. I given single supply of +15V to pin 8 and 4 pin connected to GND. But iam getting 1.34V offset at ping 7,it is effecting my current control.Please suggest me how to minimize this offset.Find the attached schematic. U29B. I am facting same issue in U28A alos,but it will not impact my voltage control.
Here are more locations where the input-voltage-range requirement is not being satisified:
You can consider using an op amp with rail-to-rail inputs, like the ADA4661 or ADA4084
You may also want to refer to the following tutorials and application notes:
MT-035 Op Amp Inputs, Outputs, Single-Supply, and Rail-to-Rail Issues
MT-041 Op Amp Input and Output Common-Mode and Differential Voltage Range
AN-581 Biasing and Decoupling Op Amps in Single Supply Applications