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UCC28C42: How to use tune the slope compensation for ucc28c42

Miles Li1
Intellectual 1640 points
Part Number: UCC28C42

Hi,

Nowadays, I plan to use ucc28c42 to build a buck circuit, which only control the current loop. And the application is to set Vin=60V, Iout=10A, and then to charge the battery from 42V to 60V. And I found that below two quesiton:

1. When VIN>48V, the VGS and inductance current seem unstable;

2. When VOUT is closer to VIN, the VGS and inductance current seem unstable.

So, do you have any tuning guide to tune slope compensation so that we could make above situation stable?  Thanks!

The TINA sumilation model is like:

  • 0
    TI__Intellectual 2640 points

    Hi Miles! 

    Thank you for reaching out to us! A good resource for compensation tips can be found here. 

    Can you provide us a schematic so we can further understand what potential problems might be? Also, can you re-upload your image using the Insert/Edit Media tool? I am unable to see the image you provided as-is. 

    Thanks again for getting in touch, I look forward to discussing this more! 

    Aidan Davidson