Regulation of feedback in Step-down converter
Budget: $30 – $250 USD
I have a simply dc-dc converter (TPS5450) in adjustable mode using a simply 10K linear potentiometer.
The problem is the non-linear output of feedback of the step-down.
When I try to regulate output voltage in first rotation of potentiometer the sensibility is good but in the last part of the rotation it becomes much more sensitive.
For example :
in the first 45 degrees of rotation of potentiometer I have a change of 1-1.5Vdc in the output voltage, but in the last 45 degree of rotation I have a change of 5-6Vdc.
I have read that it is a common problem in simply configuration of DC-DC converter without specific circuit for the feedback line.
I need to solve this problem with specific circuit with this function.
The problem is the non-linear output of feedback of the step-down.
When I try to regulate output voltage in first rotation of potentiometer the sensibility is good but in the last part of the rotation it becomes much more sensitive.
For example :
in the first 45 degrees of rotation of potentiometer I have a change of 1-1.5Vdc in the output voltage, but in the last 45 degree of rotation I have a change of 5-6Vdc.
I have read that it is a common problem in simply configuration of DC-DC converter without specific circuit for the feedback line.
I need to solve this problem with specific circuit with this function.